LG 50PQ30 Series Training Manual Download Page 110

Page: 110 / 139

50PQ30 MAIN PWB (Front Side) COMPONENT LAYOUT

MAIN (Digital) Board

SW301

P1005

IC504

Tuner Ctrl

USB

HD
MI4

Video

Aud L

Aud R

HDMI1

HDMI2

Y Pr/Pb 2

Y Pr/Pb 1

AV In

Remote

Optical

RGB Audio

Audio

Resets IC1

16 SIF

19 Video

4 (5V)

12 DIF +

13 DIF -

15 (5V)

TUNER

TU501

TDVW-H103F

IC805

IC204

Memory

P1006 to SMPS

P1003 LVDS

P1001

SPK

IC1001

Audio

L1013

L1012

Q301

IC1

X100

12Mhz

D303

Q1002

Q801

D805

IC503

IC302

L318

JK603

S-Video

Audio

IC203

X501

25Mhz

LVDS Driver

Microprocessor

Video Processor

RS232

RGB In

9V Reg

+1.2V_VDDC

regulator

5V MST

Switch Ctl

Reset Route

HDMI CEC

IC804

USB Power

D502

D804

D806

ZD601

110

Published November 2009 50PQ30 Plasma

For component voltages, see the 50PQ30 Interconnect Section page 3.

X501

Only runs when tuned

to a Digital Channel.

Summary of Contents for 50PQ30 Series

Page 1: ...Advanced Single Scan Troubleshooting Training Manual 50PQ30 Plasma Display 50PQ30 Plasma Display 720p 720p Published November 05th 2009 ...

Page 2: ...rds 2 Upper and Lower Lower board delivers Scan to Upper Control Board X Drive Boards 3 Circuit Board Operation Troubleshooting and Alignment of Switch mode Power Supply Main Board Section 1 Section 2 Contact Information Preliminary Matters Specifications Plasma Overview General Troubleshooting Steps Disassembly Instructions Voltage and Signal Distribution OUTLINE OUTLINE Main Power Switch Version...

Page 3: ...can save time and money sometimes can be overlooked These techniques will also be presented This Section will get the Technician familiar with the Disassembly Identification and Layout of the Plasma Display Panel At the end of this Section the Technician should be able to Identify the Circuit Boards and have the ability and knowledge necessary to safely remove and replace any Circuit Board or Asse...

Page 4: ... Electronics Unauthorized modifications will not only void the warranty but may lead to property damage or user injury If wires screws clips straps nuts or washers used to complete a ground path are removed for service they must be returned to their original positions and properly fastened CAUTION CAUTION To avoid personal injury disconnect the power before servicing this product If electrical pow...

Page 5: ...ge webex com LG CS Academy lgcsacademy com Published November 2009 by LG Technical Support and Training LG Electronics Alabama Inc 201 James Record Road Huntsville AL 35813 http 136 166 4 200 LG Learning Academy 32LG40 32LH30 37LH55 42LG60 42LG70 42LH20 42LH40 42LH50 47LG90 42PG20 42PQ20 50PQ30 50PG20 50PS80 50PS60 LCD DV PLASMA Also available on Also available on the Plasma page the Plasma page P...

Page 6: ...vice pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications However there...

Page 7: ...ecause of residual current stored before Circuit Board removal 4 C MOS circuits are used extensively for processing the Drive Signals and should be protected from static electricity 5 The PDP Module must be carried by two people Always carry vertical NOT horizontal 6 The Plasma television should be transported vertically NOT horizontally 7 Exercise care when making voltage and waveform checks to p...

Page 8: ...h examination using your senses the first check should always be the DC Supply Voltages to those circuits under test Always confirm the supplies are not only the proper level but be sure they are noise free If the supplies are missing check the resistance for possible short circuits Isolate To further isolate the failure check for the proper waveforms with the Oscilloscope to make a final determin...

Page 9: ...r 2009 50PQ30 Plasma This section of the manual will discuss the specifications of the 50PQ30 Advanced Single Scan Plasma Display Television 50PQ30 PRODUCT INFORMATION SECTION 50PQ30 PRODUCT INFORMATION SECTION ...

Page 10: ...0p HD Resolution 600 Hz sub field driving 1 500 cd m2 Brightness Dual XD Engine 2000 000 1 Dynamic Contrast Ratio Smart Energy Saving 3x HDMI V 1 3 with Deep Color 2 Rear 1 side AV Mode Cinema Sports Game Clear Voice LG SimpLink Connectivity Invisible Speaker System 100 000 Hours to Half Brightness Typical PC Input ...

Page 11: ...y using 10 sub fields per frame process vs Comp 8 sub field frame No smeared images during fast motion scenes 600Hz Sub Field Driving 600Hz Sub Field Driving Sub Field firing occurs using wall charge and polarity differences between Y SUS and Z SUS signals Original Image 10 Sub Fields Per Frame ...

Page 12: ...ization Picture Wizard Specifications Logo Familiarization Picture Wizard Customers can customize picture performance without the need for additional expense Picture Wizard easily guides consumers through the calibration process using on screen reference points ...

Page 13: ... H 768 V High definition television is the highest performance segment of the DTV system used in the US It s a wide screen high resolution video image coupled with multi channel compact disc quality sound HDMI 1 3 Deep Color Digital multi connectivity HDMI 1 3 Deep color provides a wider bandwidth 340MHz 10 2Gbps than that of HDMI 1 2 delivering a broader range of colors and also drastically impro...

Page 14: ...ality dialogue when background noise swells Save Energy Save Money Home electronic products use energy when they re off to power features like clock displays and remote controls Those that have earned the ENERGY STAR use as much as 60 less energy to perform these functions while providing the same performance at the same price as less efficient models Less energy means you pay less on your energy ...

Page 15: ...15 November 2009 50PQ30 Plasma 50PQ30 Remote Control 50PQ30 Remote Control TOP PORTION BOTTOM PORTION ...

Page 16: ...16 November 2009 50PQ30 Plasma 50PQ30 Rear and Side Input Jacks 50PQ30 Rear and Side Input Jacks Software Upgrades Music and Photos AC In USB SIDE INPUTS REAR INPUTS HDMI 3 ...

Page 17: ... No Label 15 5 16 405mm 25 5 8 651mm 32 3 16 817 9mm 6 3 16 157mm 7 1 4 183 74mm 2 5 16 58 74mm 15 3 4 400mm 4 15 16 125mm 15 3 4 400mm 15 3 4 400mm 74 3 lbs with Stand 68 8 lbs without Stand Weight There must be at least 4 inches of Clearance on all sides 279W Typical 0 13W Stand By Power 7 7 8 200mm 17 Published November 2009 50PQ30 Plasma ...

Page 18: ... Board Identification of the 50PQ30 Advanced Single Scan Plasma Display Panel Upon completion of this section the Technician will have a better understanding of the disassembly procedures the layout of the printed circuit boards and be able to identify each board DISASSEMBLY SECTION DISASSEMBLY SECTION ...

Page 19: ...emoving the Back Cover To remove the back cover remove the 26 screws The Stand does not need to be removed Indicated by the arrows PAY CLOSE ATTENTION TO THE TYPE SIZE AND LENGTH Of the screws when replacing the back cover Improper type can damage the front ...

Page 20: ...trol Power Supply SMPS FPC FPC Panel ID Label Panel Voltage Label Y Drive Upper Keyboard Main Power FPC Invisible Speakers FPC FPC FPC FPC FPC TCP Heat Sink AC In Conductive Tape Under Main Board Side Input part of main Center X FPC Y Drive Lower IR LED Z SUB Identify the Circuit Boards Identify the Circuit Boards ...

Page 21: ...screws holding the Y SUS in place Remove the Y SUS by lifting slightly to clear standoff and slid it to the right When replacing be sure to readjust the Va Vs voltages in accordance with the Panel Label Confirm VSC Vy and Z bias as well Disconnect the following Flexible Ribbon Connectors P101 P103 and or P201 P203 Disconnect the following connectors P209 and or P108 Remove the 3 screws holding eit...

Page 22: ...ff the Z SUS When replacing be sure to readjust the Va Vs voltages in accordance with the Panel Label Confirm VS Vy and Z bias as well Disconnect the following connectors P1001 P1003 P1005 and P1006 Remove the 1screws holding on the decorative plastic piece on the right side Remove the 4 screws holding the Main board in place and Remove the board Disconnect the following connectors P121 LVDS P101 ...

Page 23: ...ews from the Main Board Mounting Bracket Carefully reposition the Main Board and Mounting Bracket up and off to the right side E Remove the metal support Braces marked E Note There is a Left and a Right brace 3 Screws per bracket F Remove the 9 screws holding the Heat Sink Warning Never run the set with this heat sink removed X DRIVE LEFT CENTER AND RIGHT REMOVAL Disconnect all TCP ribbon cables f...

Page 24: ...ards Getting to the X Circuit Boards A B Warning Never run the TV with the TCP Heat Sink removed Warning Shorting Hazard Conductive Tape Do not allow to touch energized circuits B Stand should have already be removed D E Left E Right C F Heat Sink A LVDS Cable ...

Page 25: ...rd on all TCP connectors Left X P101 105 Center X P201 206 Right X P301 305 Carefully lift the TCP ribbon up and off It may stick be careful not to crack TCP See next page for precautions After removing the back cover the Main board is lifted out of the way the 9 screws removed from heat sink covering the TCPs and connectors to the TCPs are removed the X Drive boards can be removed Removing Connec...

Page 26: ...s shown by arrows The Lock can be easily broken It needs to be handled carefully Pull TCP apart as shown by arrow TCP Film can be easily damaged Handle with care The TCP has two small tab on each side which have to be lifted up slightly to pull the connector out Note TCP is usually stuck down to the heat transfer material be Very careful when lifting up on the TCP ribbon cable ...

Page 27: ...eft or right board or 4 for the center 8 total for all three The screws between the boards secures both boards The Left X Board drives the right side of the screen vertical electrodes The Center X Board drives the Center of the screen vertical electrodes The Right X Board drives the left side of the screen vertical electrodes ...

Page 28: ...Drive Boards At the end of this Section the technician should understand the operation of each circuit board and how to adjust the controls The technician should be able with confidence to troubleshoot a circuit board failure replace the defective circuit and perform all necessary adjustments CIRCUIT OPERATION TROUBLESHOOTING AND CIRCUIT CIRCUIT OPERATION TROUBLESHOOTING AND CIRCUIT ALIGNMENT SECT...

Page 29: ...ress RGB Cell Address Horizontal Display Panel Electrodes M5V 17V Relay On M5 On VS On STB5V 5V 17V 12V to Main PWB Vs Va and M5V to Y SUS SMPS OUTPUT VOLTAGES IN RUN 17V Z Drive Signals IR Power LED Intelligent Sensor FPCs FPCs 5V STBY P103 P208 P106 P209 P107 P106 P109 Drive Data Clock i2c X Board Center P212 P211 P331 P231 P122 P101 P121 P121 P813 M5V Vs Error Com Note Va not used by Y SUS P101...

Page 30: ...ting Voltage Set Up Vy Vsc Ve Vzb 6 Trade name of LG Electronics 7 Manufactured date Year Month 8 Warning Panel Label Explanation Panel Label Explanation 9 TUV Approval Mark 10 UL Approval Mark 11 UL Approval No 12 Panel Model Name 13 Max Watt Full White 14 Max Volts 15 Max Amps 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ...

Page 31: ...nel 3 A Picture issue is encountered 4 As a general rule of thumb when ever the back is removed Remember the Voltage Label MUST be followed it is specific to the panel s needs All label references are from a specific panel They are not the same for every panel encountered VY Z_BIAS Panel Rear View Manufacturer Bar Code Set Up Ve Vscan The Waveform adjustment is only necessary 1 When the Y SUS boar...

Page 32: ... POWER SUPPLY SECTION SWITCH MODE POWER SUPPLY SECTION This Section of the Presentation will cover troubleshooting the Switch Mode Power Supply for the Single Scan Plasma Upon completion of the section the technician will have a better understanding of the operation of the Power Supply Circuit and will be able to locate voltage and test points needed for troubleshooting and alignments SMPS P N EAY...

Page 33: ...y 5V 13 14 Gnd 15 n c 16 Gnd 17 5V Det 18 AC Det 19 RL_On 20 VS_On 21 M5_On 22 Auto Gnd 23 Stby 5V 24 Key_On STBY 123V RUN 382V STBY 160V RUN 382V F801 4A 250V F101 10A 250V 17V turns on with Vs On command RL101 RL103 Hot Ground Symbol represents a SHOCK Hazard 33 Published November 2009 50PQ30 Plasma 3 5 7 9 11 13 15 17 19 21 Gnd 12V Gnd 5V 5V Gnd Gnd 5V Det RL ON M5 ON 2 4 6 8 10 12 14 16 18 20 ...

Page 34: ...as Voltages on the Y SUS X Drive and Control Boards 17V Audio B Supply 12V Tuner B Circuits Adjustments There are 2 adjustments located on the Power Supply Board VA and VS The 5V VCC is pre adjusted and fixed All adjustments are made with relation to Chassis Ground Use Full White Raster 100 IRE VA VS RV502 RV901 Switch Mode Power Supply Overview Switch Mode Power Supply Overview 5V Signal Processi...

Page 35: ...1 Sub Micon VA VR502 Power Supply Circuit Layout Power Supply Circuit Layout PFC Circuit To MAIN P813 Main Fuse F101 10Amp 250V 4Amp 250V P811 To Y SUS 123V Stby 382V Run Fuse F801 1Amp 250V Main Bridge Rectifier 160V Stby 382V Run Fuse F302 17V Source VS VR901 AC Input SC 101 Bridge Rectifier ...

Page 36: ...elaY Drive Circuit to close both Relays RL102 and RL103 bringing the PFC source up to full power by increasing the 160V standby to 380V run which can be read measuring voltage at Fuse F302 and F801 from Hot Ground At this time the run voltages 12V and 5V sources become active and are sent to the Main Board via P813 12V at pins 5 and 6 and 5V at pins 9 10 and 12 The 5V detect line from the SMPS Boa...

Page 37: ...2 5V Mnt Relay On Y SUS Z SUS 17V 17V 5VFG Va Y DRIVE Upper X PWB Center X PWB Right Y DRIVE Lower STBY 5V M5V M5V Vs 15 9 11 11 10 8 15 15 15 4 2 4 Vs Va 12 13 16 8 15 Standby 5V will not be output if the Main Power Switch is off Power Button Front IR Board POWER SUPPLY SMPS AC Det If missing the set will turn off in 10 seconds 12V 5V 17V Audio 17V 17V Reg 7 Video Processing M5V On Vs On FG5V Flo...

Page 38: ... Va and Vs Adjustments Va TP P811 Pin 6 or 7 Important Use the Panel Label Not this book for all voltage adjustments Va Adjust Place voltmeter on pin 6 or 7 of P811 Adjust VR502 until the reading matches your label Example Voltage Label Vs Adjust Place voltmeter on pin 1 or 2 of P811 Adjust VR901 until the reading matches your label ...

Page 39: ...8 for AC Det 5V If AC Det is missing the TV will come on then shut off within 10 Sec This will happen each time the TV is turned on Provided the Power Button is closed any time AC is applied to the SMPS STBY 5V and AC DET should be present Pins Check Pin 9 10 12 for 5V Check Pins 1 or 2 for 17V Check Pins 5 or 6 for 12V P813 Check Pins 1 or 2 for Vs voltage P811 RL101 F101 SC101 AC In IC701 P813 1...

Page 40: ... to M5 ON Pin 21 brings the M5V P811 pins 9 10 line high E 100Ω watt resistor added from STBY 5V Pins 9 11 to VS ON Pin 20 brings the 17V P813 pins 1 and 2 lines high VA and VS P811 pins 1 and 2 Vs and Pins 6 and 7 Va lines high P811 disconnected from the Y SUS or the SMPS P1006 disconnected from the Main board Use the holes in the connector P1006 side to insert the resistor or jumper leads WARNIN...

Page 41: ... 12V 0V b 12V 5 Gnd Gnd Gnd Gnd 3 2 2V 17 3V 0V a 17V 1 Diode Mode Run STBY Label Pin Open Gnd Gnd Auto Gnd 22 Open 0V 0V c Key On 24 Open 3 2V 0V VS On 20 Open 5V 5V AC Det 18 Not Used Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd 14 1 13V 5V 5V Stby 5V 12 1 1V 5V 5V b 5V 10 Gnd Gnd Gnd Gnd 8 Open 12V 0V b 12V 6 Gnd Gnd Gnd Gnd 4 2 2V 17 3V 0V a 17V 2 Diode Mode Run STBY Label Pin P813 CONNECTOR SMPS to Main P1...

Page 42: ...ary in accordance with Panel Label 0 86V 5V 0V M5V 9 10 Gnd 0V 0V Gnd 8 Open 60V 0V Va 6 7 Gnd 0V 0V Gnd 4 5 n c n c n c n c 3 Open 194V 0V Vs 1 2 Diode Mode Run STBY Label Pin SC101 AC INPUT Standby Run Diode Mode Connector Pin Number SC101 120VAC 120VAC Open 1 and 3 Diode Mode Readings taken with all connectors Disconnected DVM in Diode Mode P811 CONNECTOR Power Supply to Y SUS P201 ...

Page 43: ...FG 5V FG 15V VA supplies the Panel Vertical Electrodes Routed to the Left X Board VS Supplies the Panel Horizontal Electrodes Also routed to the Z SUS board 5V Supplies Bias to Y SUS Then Routed to the Control board and Z SUS board VY Sets the Negative excursion of the Y SUS Drive Waveform VSC Set the amplitude of the complex waveform SET UP sets amplitude of the Top Ramp of the Drive Waveform SET...

Page 44: ...Waveform Distributes 15V and 5V Logic signals needed to generate drive waveform Distributes VA Receive M5V Va Vs from SMPS Y Drive Boards Receive Scan Waveform Display Panel Power Supply Board SMPS FETs amplify Y Sustain Waveform Left X Board Z SUS Board Distributes 15V Generates Floating Ground 5V by DC DC Converters Logic signals needed to scan the panel Control Board Distributes Vs and M5V Dist...

Page 45: ... ADJ VR501 FS202 Vs 4A 250V SET UP VR 601 V SET DN VR 401 M5V and 17V FS201 M5V 10A 125V P204 P203 P205 and P208 All Pins are Floating Ground Floating Gnd 5V Pins 8 and 9 P207 Pins 11 and 12 Y Drive signal V Scan Pins 2 5 Logic Drive Signals to the Y Drive Lower board P202 Ribbon c P206 VS to and Error Com from Z SUS P201 P209 VSC TP R202 FS201 Va 10A 125V VY ADJ VR502 FS501 17V 4A 125V VY TP R201...

Page 46: ...e DC level Voltage Adjustments Vy TP R201 Voltage Reads Positive VR501 VR502 Set should run for 15 minutes this is the Heat Run mode Set screen to White Wash Adjust Vy to Panel Label voltage 1V Adjust VSC to Panel Label voltage 1V Lower Center of board Just below Heat Sinks VSC TP R202 ...

Page 47: ...erved 100uS div 516V p p NOTE The Waveform Test Points are fragile If by accident the land is torn and the run lifted make sure there are no lines left to right in the screen picture 100uS VR108 VR209 80VRms There are several other test points on either the Upper or Lower Y Drive boards that can be used Basically any output pin on any of the FPC to the panel are OK to use Y Drive Lower Test Point ...

Page 48: ...nize It is outlined within the Waveform Remember this is the first large signal to the right of blanking Fig 4 At 40uSec per division the adjustment for SET UP can be made It will make this adjustment easier if you use the Expanded mode of your scope Fig 2 At 2mSec per division the waveform to use for SET UP Is now becoming clear Now the two blanking signal are still present FIG1 4mS FIG2 2mS FIG3...

Page 49: ...ize It is outlined within the Waveform Remember this is the first large signal to the right of blanking Fig 4 At 20uSec per division the adjustment for SET DN can be made It will make this adjustment easier if you use the Expanded mode of your scope Fig 2 At 2mSec per division the waveform to use for SET DN is now becoming clear Now the two blanking signals are still present FIG1 4mS FIG2 2mS FIG3...

Page 50: ... Adjustments Y Drive Test Point ADJUSTMENT LOCATIONS Top Left and Center Right SET UP ADJUST 1 Adjust VR601 and set the A portion of the signal to match the waveform above 150V 5V SET DN ADJUST 2 Adjust VR401 and set the B time of the signal to match the waveform above 100uSec 5uSec Set must be in WHITE WASH All other DC Voltage adjustments should have already been made ...

Page 51: ...ek widens due to the SET UP peeking too quickly The center begins to wash out and arc due to SET UP Panel Waveform Adjustment Ramp SET UP Too High 200V Full Counter Clock Wise Set Up Adjustment Too High or Low Set Up Adjustment Too High or Low Ramp SET UP Too Low 80V Full Clock Wise Set Up swing is Minimum 80V Max 200V ...

Page 52: ... Too High or Low Set Down Adjustment Too High or Low Set Dn swing is Minimum 73uS Max 166uS NOTE If Set DN too high this set may go excessive bright then shutdown If this happens remove the LVDS from Control board and make necessary adjustments Then reconnect LVDS select White Wash and adjust correctly SET DN Too High 166uSec Full Clock Wise SET DN Too Low Counter Clock Wise 100V off the Floor Flo...

Page 53: ...45F122 Q34 Shown 0 483V Reverse Open Shown 0 69V Reverse 0 67V Shown 1 09V Reverse Open RJP4584 Q32 Shown 0 5V Reverse Open Shown 0 59V 0 6V Reverse Open Reversed 2 18V Shown Open Shown 2 2V Reverse Open K3667 Q18 Q31 RF2001 D31 D32 D33 D34 D36 D717 Shown Shorted Reverse Shorted Shown 0 37V 0 38V Reverse Open 0 3 Ohms Shown 0 37 0 38V Reverse Open Blk Red Blk Red Blk Red Blk Red Blk Red Blk Red Bl...

Page 54: ...uit Shown 1 95V Reverse Open Shown 0 876V Reverse 1 56V Shown 0 46V Reverse Open Shown 0 392V Reverse Open Shown 0 392V Reverse Open Shown 0 668V Reverse 0 6V Shown Shorted Reverse Shorted 0 3 Ohm Shown 0 998V Reverse Open Shown 0 392V Reverse Open I4F14229 Q16 Q17 RF020 D11 30J124 Q11 Q12 Q13 Blk Red Blk Red Blk Red Blk Red Blk Red Blk Red Blk Red Blk Red Blk Red ...

Page 55: ...s to the Y Drive lower P209 carries the Y Drive signals to the upper via P108 c Y Drive Lower Board Y SUS Board Bottom Connector P207 P205 11 V Scan 10 V Scan 9 n c 8 5V VF 7 5V VF 6 Ground F 5 STB 4 OC1 3 DATA 2 OC2 1 Ground F FL201 TIP Use P207 pins 1 or 2 or the Right Side of C213 to test for Y Scan signal if the Y Drive boards are removed C213 P207 Pins 1 and 2 Y Scan signal 400V p p No Y Driv...

Page 56: ...om Floating Ground Pin 1 RED LEAD Blk Lead FG BLACK LEAD Red Lead FG 12 V Scan 11 V Scan 10 n c 9 5V VF 8 5V VF 7 Ground F 6 CLK 5 STB 4 OC1 3 DATA 2 OC2 1 Ground F Open Open Open 1 9V 1 9V 0V 1 43V 1 43V 1 43V 1 53V 1 53V 0V Open Open Open 0 557V 0 557V 0V 0 66V 0 66V 0 68V 0 66V 0 68V 0V Floating Gnd Floating Gnd Y Drive Sig Y Drive Sig Meter in the Diode Mode P207 c C213 Y Drive Board should be...

Page 57: ... P209 Pins 7 8 9 and 10 are Logic Signals from the Control board routed through the Y SUS to the Y Drive upper Between the Y Drive upper and lower is P209 P108 which carries the Y Drive Scan signals from the lower to the upper Y Drive Upper Board Y SUS Board Top Connector P209 P109 11 Ground F 10 DATA 9 OC1 8 STB 7 CLK 6 Ground F 5 5V VF 4 5V Vf 3 Ground F 2 Ground F 1 Ground F c FL101 ...

Page 58: ... 1 3 RED LEAD Blk Lead FG BLACK LEAD Red Lead FG 12 Ground F 11 DATA 10 OC1 9 STB 8 CLK 7 STB 6 Ground F 5 5V VF 4 5V VF 3 Ground F 2 Ground F 1 Ground F 0 1 53V 1 43V 1 53V 1 43V 1 43V 0V 1 94V 1 94V 0V 0V 0V 0V 0 68V 0 66V 0 68V 0 66V 0 66V 0V 0 68V 0 68V 0V 0V 0V Floating Gnd Floating Gnd Floating Gnd Meter in the Diode Mode P209 P109 of the Y Drive Upper Board P209 of the Y SUS Board c Floatin...

Page 59: ...P812 Plug Information SUS P201 to SMPS P812 Plug Information Note This voltage will vary in accordance with Panel Label 0 86V 5V 0V M5V 10 0 86V 5V 0V M5V 9 Gnd Gnd Gnd Gnd 8 Open 60V 0V Va 7 Open 60V 0V Va 6 Gnd Gnd Gnd Gnd 5 Gnd Gnd Gnd Gnd 4 NC NC NC NC 3 Open 193V 0V Vs 2 Open 193V 0V Vs 1 Diode Mode Run STBY Label Pin P201 CONNECTOR Y SUS to Power Supply P811 ...

Page 60: ...in Diode Mode Y Y SUS P202 to X Drive P122 Plug Information SUS P202 to X Drive P122 Plug Information Note This voltage will vary in accordance with Panel Label Open 60V 0V VA 7 Open 60V 0V VA 6 Open 60V 0V VA 5 nc nc nc nc 4 Gnd Gnd Gnd Gnd 3 Gnd Gnd Gnd Gnd 2 Gnd Gnd Gnd Gnd 1 Diode Mode Run STBY Label Pin P202 CONNECTOR Y SUS to X Drive Left P122 ...

Page 61: ...Diode Mode Y Y SUS P206 to Z Drive P101 Plug Information SUS P206 to Z Drive P101 Plug Information Note This voltage will vary in accordance with Panel Label Open 193V 0V VS 11 12 nc nc nc nc 10 Gnd 89V 0V Er Com 8 9 nc nc nc nc 7 Gnd Gnd Gnd Gnd 3 6 0 86V 5V 0V M5V 1 2 Diode Mode Run STBY Label Pin P206 Connector Y SUS to Z Drive P101 Plug Information ...

Page 62: ...ector FS201 5V to run the Control Board Leaves the Control Board on P101 pins 4 7 Can also be checked at J843 M5V TP FS501 and 15V Test Point 15V to run the Z SUS Board Routed out P101 to the Control Board Leaves the Control Board on P101 pins 11 and 12 Can also be checked at J642 15V TP Run 5V Standby 0V Diode Check 0 86V Run 15V Standby 0V Diode Check Open Location Bottom Center Right Location J...

Page 63: ...oint Floating Ground referenced 5V Used for low voltage signal processing on the Y Drive board Leaves the Y SUS board on P207 pins 8 and 9 AND P209 pins 5 and 5 Checked at J795 5V F Test Point FG15V Test Point FG15V to develop the Y Drive signal Checked at J644 15V F Test Point Run 5V Standby 0V Diode Check 1 94V Run 15 2V Standby 0V Diode Check 1 5V Location Bottom Center of the two large black h...

Page 64: ...S P101 to Control P111 Plug Information Tip Y SUS P101 CONNECTOR to Control board P111 30 Pin Connector With Ribbon Cable Without Ribbon Cable Only Odd pins are easily accessible with Ribbon Cable inserted TIP For Voltage readings Check Odd pins on Y SUS board Check Even pins on Control board P101 Connector Label Pin 1 Pin 29 See next page For Voltage readings ...

Page 65: ...7 0 9V 1 99V Delta VY Det 15 Gnd Gnd Gnd 13 1 78V 0V Gnd Y Enable 11 1 3 0 1V CTRL_OE 9 2V 5V 5V 7 2V 5V 5V 5 1 37V 17 04V 15V 3 1 37V 17 04V 15V 1 Diode Mode Run Label Pin Gnd Gnd Gnd 30 0 9V 1 1V Blocking 28 0 9V 3 12V Ramp Slope OPT 1 26 0 9V 024V SET UP 24 0 9V 0 6V CLK 22 0 9V 1 45V STB 20 0 9V 1 44V OC1 18 0 9V 0V Data 16 0 9V 1 82V OC2 14 Gnd Gnd Gnd 12 Gnd Gnd OE 10 Gnd Gnd Gnd 8 2V 4 95V ...

Page 66: ...odes sequentially starting at the top and scanning down the panel 50PQ30 uses 8 Driver ICs on 2 Y Drive Boards Warning To facilitate scope attachment solder a small wire Stand Off at this point Be very careful these are fragile and can peal off with excessive heat or stress Y Drive WAVEFORM TEST POINTS Y Drive V Scan WAVEFORM Y Y Drive Explained Drive Explained Y Y DRIVE BOARD SECTION DRIVE BOARD ...

Page 67: ...or P109 Upper Y Upper Y Drive Layout Drive Layout Y SUS SIDE PANEL SIDE Y Drive signal VSC from the Y SUS board through the Y Drive lower is supplied to the Upper Y Drive Board on Connector P108 TIP The connectors to the Y SUS board are very easy to misalign and plugged in The Connector will be below the actual pins on the Y SUS Look carefully See Tip section page 133 134 ...

Page 68: ...09 Pins 7 8 9 and 10 are Logic Signals from the Control board routed through the Y SUS to the Y Drive upper Between the Y Drive upper and lower is P108 P209 which carries the Y Drive Scan signal from the lower to the upper P209 Y Drive Upper Board Y SUS Board Top Connector P109 P109 c FL101 11 Ground F 10 DATA 9 OC1 8 STB 7 CLK 6 Ground F 5 5V VF 4 5V VF 3 Ground F 2 Ground F 1 Ground F ...

Page 69: ...adings from Floating Ground Pin 1 3 6 or 12 RED LEAD Blk Lead FG BLACK LEAD Red Lead FG 12 Ground F 11 OC2 10 DATA 9 OC1 8 STB 7 CLK 6 Ground F 5 5V VF 4 5V VF 3 Ground F 2 Ground F 1 Ground F 0V Open Open Open Open Open 0V 1 94V 1 94V 0V 0V 0V 0V 0 52V 0 67V 0 54V 0 54V 0 54V 0V 0 43V 0 43V 0V 0V 0V Floating Gnd Floating Gnd Floating Gnd Floating Gnd Meter in the Diode Mode Floating Gnd TIP This ...

Page 70: ...e Lower Layout Y SUS SIDE PANEL SIDE Y Drive signal VSC from the Y SUS board is supplied to the Lower Y Drive Board on connector P205 pins 11 and 12 Then the Lower Y Drive delivers the V Scan signal to the upper via P209 to P108 TIP The connectors to the Y SUS board are very easy to misalign and plugged in The Connector will be below the actual pins on the Y SUS Look carefully See Tip section page...

Page 71: ...V p p P207 Pins 2 3 4 and 5 are Logic Drive Signals to the Y Drive lower P209 carries the Y Drive signals to the Upper Y Drive board c Y Drive Board Y SUS Board Bottom Connector P205 P205 11 V Scan 10 V Scan 9 n c 8 5V VF 7 5V VF 6 Ground F 5 STB 4 OC1 3 DATA 2 OC2 1 Ground F FL201 TIP Use P207 pins 1 or 2 or the Right Side of C213 to test for Y Scan signal if the Y Drive boards are removed C213 R...

Page 72: ...oard All Readings from Floating Ground Pin 1 or 7 RED LEAD Blk Lead FG BLACK LEAD Red Lead FG 12 V Scan 11 V Scan 10 n c 9 5V VF 8 5V VF 7 Ground F 6 CLK 5 STB 4 OC1 3 DATA 2 OC2 1 Ground F Open Open Open Open Open 0V Open Open Open Open Open Open 1 0V 1 0V Open 0 425V 0 425V 0V 0 538V 0 538V 0 538V Open 0 521V 0V Floating Gnd Floating Gnd Y Drive Sig Y Drive Sig Meter in the Diode Mode TIP This t...

Page 73: ... FGnd 2 0V 0V FGnd 1 Diode Mode Red Lead Run Label Pin P108 CONNECTOR Y Drive Upper to Lower P108 P209 1 0V 1 0V 1 0V 0V 0V Diode Mode Black Lead Open 134V Y Scan 5 Open 134V Y Scan 4 Open 134V Y Scan 3 0V 0V FGnd 2 0V 0V FGnd 1 Diode Mode Red Lead Run Label Pin P209 CONNECTOR Y Drive Lower to Upper Y Drive Upper Y Drive Lower TIP This test will check All scan buffers Input side on the board Volta...

Page 74: ...Cable carefully slide it back into the slot see Fig 3 be sure the Tab is seated securely and press the Locking Tab back to the locked position see Fig 2 then Fig 1 Removing Panel Flexible Ribbon Cables from Y Removing Panel Flexible Ribbon Cables from Y Drive Upper or Lower Drive Upper or Lower Flexible Ribbon Cables shown are from a different model but pro Flexible Ribbon Cables shown are from a ...

Page 75: ...The Locking Tab will offer a greater resistance to closing in the case Note the cable is crooked In this case the Tab on the Ribbon cable was improperly seated at the top This can cause bars lines intermittent lines abnormalities in the picture Remove the ribbon cable and re seat it correctly Incorrectly Seated Y Incorrectly Seated Y Drive Flexible Ribbon Cables Drive Flexible Ribbon Cables ...

Page 76: ...UG READING OPEN YOU CAN CHECK ALL 8 BUFFER ICs USING THIS PROCEDURE YOU CAN CHECK ALL 8 BUFFER ICs USING THIS PROCEDURE Any of these output lugs can be tested Look for shorts indicating a defective Buffer IC Indicated by white outline Indicated by white outline 128 Output Pins per FPC Flexible Printed Circuit 6 Ribbon cables Horizontal Electrodes 768 Total Horizontal Electrodes controlling Vertica...

Page 77: ...the Presentation will cover troubleshooting the Z Z SUS Board Assembly SUS Board Assembly Upon completion of this section the Technician will have a bette Upon completion of this section the Technician will have a better understanding of the circuit and be r understanding of the circuit and be able to locate voltage and diode mode test points needed for tro able to locate voltage and diode mode te...

Page 78: ...s generate erase sustain waveforms Generates Z Bias 100V Receives Logic Signals M5V and VS PDP Display Panel Via 3 FPC Flexible Printed Circuits Control Board Y SUS Board NO IPMs POWER SUPPLY Board 5V 17V 17V Z SUS board receives VS and M5V from Y SUS and 17V from the Control board M5V and VS Z SUB FET Makes Drive waveform ...

Page 79: ...S Waveform Development ICs P105 FPC P103 P101 VS and M5V Input from the Y SUS Logic Signals from the Control board Also 15V generated on the Y SUS and routed through the Control board Z SUS Waveform Test Point J27 To Z SUB No IPMs FS100 M5V 10A 125V FS102 VS 4A 250V Z Bias VR200 Z Bias TP Top of R271 or R272 ...

Page 80: ...4 P105 and also P103 to the Z SUB which connects to the panel via P302 Oscilloscope Connection Point J27 to check Z Output waveform Right Hand side Center Z Z SUS Waveform SUS Waveform This Waveform is just for reference to observe the effects of Zbz adjustment Vzb voltage 1V 80 V Z Drive Waveform Vzb Z Bias VR200 400uS div 50V div TIP The Z Bias VZB Adjustment is a DC level adjustment This is onl...

Page 81: ...side of the panel when adjusting VR200 Set should run for 15 minutes this is the Heat Run mode Set screen to White Wash mode or 100 IRE White input Adjust VZ Z Bias to Panel Label 1V Top of Z SUS Board Measured from Chassis Ground Chassis Ground or the Top of C239 or J125 Note You can also measure across C239 for the VZB Zbias adjustment Z Bias VZB Z Bias VR200 ...

Page 82: ...de Checks SUS P206 Voltages and Diode Checks Voltage and Diode Mode Measurements Open 193V VS 11 12 Open n c n c 10 Open 94 9V ER COM 8 9 n c n c n c 7 Gnd Gnd Gnd 3 6 Open 5V M5V 1 2 Diode Mode Run Label Pin Note This voltage will vary in accordance with Panel Label P101 CONNECTOR Z SUS to Y SUS P206 Pin 1 Location Top Left There are no Stand By voltages on this connector ...

Page 83: ...iode Checks Voltage and Diode Mode Measurements Open 0 2V Z SUS UP 8 Open 0 8V Z SUS DN 9 Gnd Gnd Gnd 10 Open 17V 15V 11 Open 17V 15V 12 Open 0 4V Z ER DN 7 Open 0 3V Z ER UP 6 Gnd Gnd Gnd 5 Open 1 7V Z Ramp 4 Open 1 8V Z Bias 3 Open 0 05V Z Enable 2 Gnd Gnd Gnd 1 Diode Mode Run Label Pin Location Bottom Left hand side Pin 1 P100 CONNECTOR Z SUS to Control P101 There are no Stand By voltages on th...

Page 84: ...52V Reverse Open Shown Short Reverse Short 20NF20 Q311 Shown 0 52V Reverse Open Shown 0 678V Reverse Open 33N25T Q312 D305 D306 D311 D312 Shown Short Reverse Short Shown 0 36V Reverse Open 0 1 Ohms D301 D302 D303 D304 RF2001 Shown 0 36V Reverse Open Shown Open Reverse Open Shown Open Reverse Open 0 1 Ohms Blk Red Blk Red Blk Red Blk Red Blk Red Blk Red Blk Red Blk Red Blk Red ...

Page 85: ...rinted on the components Readings In Circuit Shown 1 496V A 0 6V Reverse 0 782V Shown 0 364V A 0 49V Reverse Open AQ302 AQ304 BQ313 BQ314 Shown 0 536V Reverse Open Shown 1 22V Reverse Open 5N50C Q321 Q315 Q317 Q318 45F122 Shown Open Reverse 1 14V B0 95V Shown Open Reverse Open Blk Red Blk Red Blk Red Blk Red Blk Red Blk Red ...

Page 86: ...S Has Failed SUS Has Failed Jump Vs to Pin 11 or 12 Jump M5V to Pin 1 or 1 Jump STBY 5V to any 5V location Leave P101 to P100 Connected When you apply AC to the SMPS check the Z Bias waveform TP for 100V P P signal All this assumes the Power supply and Control board are working correctly Jump 17V to any FS101 ...

Page 87: ...n of the Presentation will cover troubleshooting the Control Board Assembly Upon completion of this section the Technician will have a better understanding of the circuit and be able to locate voltage and diode mode test points needed for troubleshooting Main Board Supplied Panel Control and LVDS Signals Operating Voltages Operating Voltages Control Board Generated Y SUS and Z SUS Drive Signals Su...

Page 88: ...ion Software Download Connection To P101 Y SUS Part Number Label n c 5V 1 8V Gnd 4 8V Gnd 3 3V 5V To P100 Z SUS P101 To P1003 Main EEPROM IC101 Vs DA 3 2V FL111 FL112 M5V IC141 DRAM IC251 3 3V IC211 IC201 MCM IC241 IC221 Pin 1 Gnd 1 3 3V 2 0V 3 3 3V 4 Gnd 5 3 3V 6 0V 7 3 3V 8 0V IC241 1 0 8V 2 Gnd 3 4 96V 4 5 74V 5 4 91V 6 Gnd 7 Gnd 8 4 95V Pin 1 Pin 1 X101 Crystal 25Meg 3 3V LVDS Cable 17V Pins 1...

Page 89: ...l regulators on the Control Board For Control Board operation verification watch D201 for blinking Note IC221 3 3V Regulator routed out P162 56 60 to X PWBs 89 50PQ30 CONTROL BOARD Troubleshooting Tips 50PQ30 CONTROL BOARD Troubleshooting Tips No Connection FL111 FL112 M5V Fuses EMI Filters Used for ROM Updates Pin 1 Gnd Pin 2 3 3V Pin 3 4 95V IC221 LVDS To Z SUS Pin 11 12 17V To Left X Board To R...

Page 90: ...2 No Video No Picture Sound OK This can be checked by the following 1 Disconnect the Main board from all connectors Apply AC power Since P813 is not connected to the SMPS the set will come on Short the two pins on the Auto Test Pattern lands If there is a picture of cycling colors and patters the Y SUS Y Drive Z SUS Power Supply Control board X Boards TCPs and Panel are all OK Use the same test fo...

Page 91: ...cy of the sine wave is 25 MHZ Missing this clock signal will halt operation of the panel drive signals Osc Check 25Mhz Checking the Crystal X101 Checking the Crystal X101 Clock Clock on the Control Board on the Control Board DC Voltage Check 1 5V 1 8V CONTROL BOARD CRYSTAL LOCATION X101 ...

Page 92: ...ith the Remote Control or Keypad Loss of these Signals would confirm the failure is on the Main Board Example of Normal Signals measured at 200mv cm at 5µs cm Menu Off Menu ON LVDS Cable P121 on Control board shown Press two outside tabs inward to release Control Board LVDS Signals Control Board LVDS Signals Connector P1002 Configuration indicates signal pins On Main Board 1 3 5 7 9 11 13 15 17 19...

Page 93: ... screen it could be a Control Board problem MCM 16 bit words Resistor Array 256 Lines output Total Basic Diagram of Control Board Control Board to X Board Address Signal Flow IC201 Control Board Signal Simplified Block Diagram Control Board Signal Simplified Block Diagram MCM IC201 DRAM 2 Buffer Outputs per TCP CONTROL BOARD X DRIVE BOARD PANEL 128 Lines per Buffer To Center X Board EEPROM There a...

Page 94: ...two Interlocks that must be disengaged to remove the LVDS Cable To Disengage press the two Locking Tabs Inward and pull the plug out Removing the LVDS Cable from the Control Board Removing the LVDS Cable from the Control Board Press Inward Press Inward ...

Page 95: ...S FL111 and FL112 5V Fuse Pins 1 and 2 Receive 15V from the Y SUS Pins 9 10 11 and 30 Are Ground All the rest are delivering Y SUS Waveform development and Y Drive logic signals to the Y SUS Board Y Drive logic signals are simply routed right through the Y SUS to the Y Drive boards The 17V is not used by the Control board it is routed to the Z SUS leaving on P101 Pins 11 and 12 Pin c Odd Pins Even...

Page 96: ...s that taking voltage or signal readings on P111 show Odd pins on the Left and Even pins on the Right P111 Example If there were room for Labeling Odd Pins Even Pins Silkscreen Label The pin numbers are correct Remember Odd pins on the left and even pins are on the right Silkscreen Label The pin numbers are correct Remember Odd pins on the left and even pins are on the right ...

Page 97: ...en 3 12V SET_UP 26 Open 024V SLOPE_OPT 24 Open 0 6V CLK 22 Open 1 45V STB 20 Open 1 44V OC1 18 Open 0V DATA 16 Open 1 82V OC2 14 Gnd Gnd GND 12 Gnd Gnd GND 10 Gnd Gnd GND 08 0 97V 4 95V 5V 06 0 97V 4 95V 5V 04 Open 17 04V 15V 02 Diode Mode Run Label Pin Diode Mode Readings taken with all connectors Disconnected DVM in Diode Mode Control P111 to Y Control P111 to Y SUS P101 Plug Information SUS P10...

Page 98: ...Gnd Gnd 5 Open 1 7V SLOPE_CTRL 4 Open 1 8V Z_Bias 3 Open 0 05V Z_ENABLE 2 Gnd Gnd Gnd 1 Diode Mode Run Label Pin Diode Mode Readings taken with all connectors Disconnected DVM in Diode Mode Control Board P101 to Z Control Board P101 to Z SUS P100 Plug Information SUS P100 Plug Information P101 CONNECTOR Control Board to Z SUS P100 Pin 1 at the bottom of the connector ...

Page 99: ...moved Control Board Connector P161 and P162 to X Control Board Connector P161 and P162 to X Drive Boards Drive Boards Tape removed 3 3V TP The rest of the pins are much too close together for a safe test 3 3V created by IC221 Delivers only RGB drive signals 3 3V TP P161 P162 Delivers only RGB drive signals and 3 3V Note In this set both connectors go to the Center X Board ...

Page 100: ...the X Drive Boards So they are not very prone to failure In this section the X Drive will be discussed and information given allowing the service technician to determine if a failure has occurred in the X Drive section X BOARDS CONTROL THE VERTICAL ELECTRODES WHICH DETERMINE THE HORIZONTAL PIXEL COUNT TOTAL VERTICAL ELECTRODES 4096 TOTAL HORIZONTAL PIXELS 1365 Total Buffer Count 36 TCPs 16 2 buffe...

Page 101: ...D TCP IC s shown are part of the Ribbon Cable Warning DO NOT attempt to run the set with the Heat Sink over the TCPs removed After a very short time these ICs will begin to self destruct due to overheating CENTER X BOARD TCP IC s shown are part of the Ribbon Cable LEFT X BOARD TCP IC s shown are part of the Ribbon Cable P231 P232 P122 P121 P211 P212 P331 ...

Page 102: ...PAD Electrode of the PANEL with the X Board TCP Connector Frame X_B D Front panel Horizontal Address Rear panel Vertical Address TCP Tape TCP Tape Carrier Carrier Package Package Control Board Back side of TCP Ribbon TCP Taped Carrier Package Flexible Cable Y SUS Board Va Logic Connector X Drive Board Heat Sink ...

Page 103: ... 20 25 30 35 40 45 50 1 On any Gnd On any Va 4 5 6 7 44 45 46 47 10 11 12 13 14 27 28 2 9 30 37 38 39 40 41 Look for any TCPs being discolored Ribbon Damage Cracks folds Pinches scratches etc Va Va Gnd Gnd Reverse Leads Reads Open Reversed biased On 3 3V 32 or 33 On any signal 15 16 18 19 21 22 24 26 31 36 ...

Page 104: ...009 50PQ30 Plasma TCP 3 3V B Check TCP 3 3V B Check Warning DO NOT attempt to run the set with the Heat Sink over the TCPs removed Checking IC221 for 3 3V use center pin IC221 5V 3 3V 0V 3 3V 3 3V in on Pins 1 5 P232 ...

Page 105: ...to shutdown b Generate abnormal vertical bars c Cause the entire area driven by the TCP to be All White d Cause the entire area driven by the TCP to be All Black e Cause a Single Line defect Warning DO NOT attempt to run the set with the Heat Sink over the TCPs removed After a very short time these ICs will begin to self destruct due to overheating ...

Page 106: ...ted DVM in Diode Mode X Drive Left Connector P122 Voltages and Diode Check X Drive Left Connector P122 Voltages and Diode Check Open 60V VA 7 Open 60V VA 6 Open 60V VA 5 n a n a n c 4 Gnd Gnd Gnd 3 Gnd Gnd Gnd 2 Gnd Gnd Gnd 1 Diode Mode Run Label Pin Note This voltage will vary in accordance with Panel Label P122 CONNECTOR X Drive Left to Y SUS P202 ...

Page 107: ...or P232 and P331 X Drive Left and Right Connector P232 and P331 Voltage and Diode Mode Measurements for these connectors are difficult to read They are too close together for safe test The pins are also protected by a layer of tape to prevent the tab from being released causing separation from the Cable and the connector ...

Page 108: ...a better understanding of the operation of the circuit and will be able to locate voltage and diode mode test points needed for troubleshooting and for all alignments 5V MST 3 3V MST 3 3V PVSB 1 8V MST 1 2V VDDC 9V TU 5V Stand By 5V Developed on the Main Board DC Voltage and Waveform Checks Diode Mode Measurements MAIN BOARD SECTION MAIN BOARD SECTION 3 3V VST 3 3V DVDD 2 5V 1 2V PVSB 5V TU 12V Tu...

Page 109: ...To Power Supply HDMI inputs RS232 SPK Out To Front Controls Main Board Layout and Identification Main Board Layout and Identification Tuner X501 25 Mhz X1 12 Mhz Audio Audio RGB DVI Reset SW100 Optical Audio USB HDMI 3 Wired Remote A V Composite inputs P1003 Pin 1 Pin 19 S In IC503 IC203 IC204 IC1001 IC805 IC504 RF IC302 ...

Page 110: ...C A IC204 Memory P1006 to SMPS P1003 LVDS P1001 SPK IC1001 Audio L1013 L1012 B C E Q301 IC1 X100 12Mhz E C B A C A D303 Q1002 Q801 A C A D805 IC503 IC302 L318 JK603 S Video Audio IC203 X501 25Mhz LVDS Driver Microprocessor Video Processor RS232 RGB In 9V Reg 1 2V_VDDC regulator 5V MST Switch Ctl Reset Route HDMI CEC IC804 USB Power D502 A C A D804 D806 C A ZD601 110 Published November 2009 50PQ30 ...

Page 111: ...C A D802 IC803 IC802 Q892 D628 Q601 D627 B C E Q890 Q504 Q501 2 1 3 2 IC505 50PQ30 MAIN PWB Back Side COMPONENT LAYOUT C B E C B E Q303 IC301 P1006 D633 IC602 1 3 2 Out Out Gnd In D D G S A C A A C A A C A B E C B E C 1 SIF 16 Video 19 5V 4 DIF 12 DIF 13 TUNER 111 Published November 2009 50PQ30 Plasma For component voltages see the 50PQ30 Interconnect Section page 3 ...

Page 112: ...Pin 16 Audio Test Point Pin 4 Tuner B 5V Pin 1 DIG IF Pin 13 DIG IF Pin 12 Digital Channel Test Point Pin 15 Tuner B 5V Data Pin 9 Clock Pin 8 TU501 MAIN Board Tuner Location Main Board Tuner Check Shield Off Pins Exposed Main Board Tuner Check Shield Off Pins Exposed ...

Page 113: ...put Check and SIF Output Check 450mVp p Pin 19 Video Signal Pin 16 SIF Signal 2 24Vp p USING COLOR BAR SIGNAL INPUT Pin 12 and Pin 13 Dig IF Signal Note Dig IF Signal only when receiving a Digital Channel 100mV 1uSec Pin 1 Note Video Out Signal only when receiving an analog Channel 700mVp p 200mV 2uSec 500mV 10uSec ...

Page 114: ...09 50PQ30 Plasma Main PWB Tuner Clock and Data Lines Main PWB Tuner Clock and Data Lines Pin 8 SDA 100uS 1V per div 5V p p Pin 9 SCL 100uS 1V per div 5V p p Note SCL and SDA only active during an actual Channel Change ...

Page 115: ...ocation Main Board Crystal X1 and X501 Check Main Board Crystal X1 and X501 Check Left Side 1 576V DC 2 5V p p Right Side 1 6V DC 3V p p 12Mhz Top 1 49V DC 3 84V p p Bottom 1 58V DC 5 27V p p 25Mhz Runs all the time X1 X501 Runs only on Digital Channels ...

Page 116: ...5uSec per Div Using a SMPTE Color Bar Signal 700mVp p Pin 1 Pin 11 2uSec per Div Pin 18 2uSec per Div P1003 LVDS Pin 11 2uSec 718mV P1003 LVDS Pin 11 5uSec 718mV P1003 LVDS Pin 11 2uSec 642mV P1003 LVDS Pin 11 5uSec 642mV See Interconnect Diagram Page 2 for all LVDS See Interconnect Diagram Page 2 for all LVDS cable video signal Waveforms cable video signal Waveforms ...

Page 117: ...7V 1 Diode Mode Run STBY Label Pin P1006 Pin front Gnd Gnd Gnd Auto Gnd 22 Open 0V 0V Key On 24 Open 3 3V 0V VS On 20 Open 4 5V 4 6V AC Det 18 Gnd Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd 14 1 1V 5V 5V STBY5V 12 1 1V 5V 5V 5V 10 Gnd Gnd Gnd Gnd 8 Open 12V 0V 12V 6 Gnd Gnd Gnd Gnd 4 Open 17 3V 0V 17V 2 Diode Mode Run STBY Label Pin P301 CONNECTOR Main to Power Supply P813 Note If the Key On line is 5V the Ma...

Page 118: ...98V 1 37V 21 0 78V 1 27V 19 0 88V 1 3V 17 0 78V 1 3V 15 0 96V 1 3V 13 0 78V 1 3V 11 Open 3 3V 9 Gnd Gnd 7 Gnd Gnd 5 Open 3 3V 3 n c n c 1 Diode Mode Run Pin Gnd Gnd Gnd 26 1 37V 3 29V PC_SER_DATA 24 0 869V 1 12V RA2 22 0 78V 1 21V RB2 20 0 849V 1 26V RC2 18 0 78V 1 24V RCCLK2 16 0 847V 1 21V RD2 14 0 85V 1 23V RE2 12 0 889V 3 29V Module_SDA1 10 Gnd Gnd Gnd 8 Gnd Gnd Gnd 6 Open 3 29V ROM_TX1 4 n c ...

Page 119: ...01 CONNECTOR MAIN Board to Front IR J1 PWM LED W LED R Gnd 3 3VST 5VST Gnd EYE SDA EYE SCL Gnd P Key Key2 Key1 Gnd IR Label Gnd Gnd Gnd 12 Open 0V 3 3V 13 Open 03 25 0V 14 0 961V Gnd Gnd 15 0 629V 5 13V 0V 11 1 3V 5V 5V 10 Gnd Gnd Gnd 9 Open 3 3V 0V 8 Open 3 3V 0V 7 Gnd Gnd Gnd 6 Open 0V 0V 5V 5 1 9V 3 3V 0V 4 1 9V 3 3V 0V 3 Gnd Gnd Gnd 2 Open 5V 5V 1 Diode Mode Run STBY Pin Pin 5 Power Key This p...

Page 120: ...Plug P1005 Voltages and Diode Checks P1005 Speaker Connector Diode Mode Readings with all Connectors Disconnected DVM in the Diode mode L L R R Label Open 8 65V 0V 4 Open 8 65V 0V 3 Open 8 65V 0V 2 Open 8 65V 0V 1 Diode Mode Run SBY Pin MAIN BOARD P1005 CONNECTOR Main to Speakers R R L L Speakers are 8 Ohms ...

Page 121: ...ard on the board Unplug the connector P101 FRONT CONTROL BOARD IR and LED KEY BOARD SECTION FRONT CONTROL BOARD IR and LED KEY BOARD SECTION Front Key Board Screw Screw P101 Master Power Switch Set will not function with this Mechanical switch down in the open position Disengaged Button Assembly Removed Key Board Removal Key Board Removal Gnd Strap Key Board Ft IR Board To left screw Tab Tab ...

Page 122: ...and section REMOVAL Remove the 2 screws pay attention to the Ground Strap on the left screw Be sure to return this strap and IR problems may occur without it Unplug the connectors J1 and J2 Front IR and Power LED Board Removal Front IR and Power LED Board Removal Front IR Board Screw Screw Gnd Strap With Gnd Strap J2 J1 J2 Pin ...

Page 123: ...cludes the IR Receiver and the Intelligent Sensor The Front POWER LED is also located on this board Ft Power LED IR Board Layout Ft Power LED IR Board Layout Back View Front View IR Sensor INTELLIGENT Sensor FRONT POWER LEDs J2 To Main Board To Front Keys J1 ...

Page 124: ...ck View Front View IR Sensor Intelligent Sensor Front Power LEDs ZN1 0 653V ZN3 0 7V ZN2 0 687V Leads opposite Open 0 652V Place Voltmeter in Diode Mode Red on bottom of either LED black lead on top and they light Blue LED Red LED 0 652V Gnd Place Voltmeter in Diode Mode Place Voltmeter in Diode Mode Black on Gnd ...

Page 125: ...d 3 3VST 5VST Gnd EYE SDA EYE SCL Gnd P Key Key2 Key1 Gnd IR Label Gnd Gnd Gnd 12 3 22V 0V 3 23V 13 Open 03 23 0V 14 1V 0V 0V 15 1 1V 5V 0V 11 1 06V 5V 5V 10 Gnd Gnd Gnd 9 2 5V 3 3V 0V 8 2 5V 3 3V 0V 7 Gnd Gnd Gnd 6 Open 0V 0V 5V 5 1 6V 3 3V 0V 4 1 6V 3 3V 0V 3 Gnd Gnd Gnd 2 3 2V 5V 4 8V 1 Diode Mode Run STBY Pin Pin 5 Power Key This pin is 0V when the Main Power button is locked On In and 5V when...

Page 126: ...ont IR Board Plug J2 to Key Board Voltages and Diode Check J2 Pin STBY2 Main Power Switch IN Normal STBY1 Main Power Switch OUT Vacation Gnd PWR SW KEY 2 KEY 1 LABEL Gnd Gnd 0V 0V STBY2 Open Gnd Gnd 1 Open Gnd 4 38V 2 Open 3 3V 0V 3 Open 3 3V 0V 4 Diode Mode Run STBY1 Pin J2 CONNECTOR Ft LED Board to Ft Key Board This pin is open in reference to Chassis Ground Use this pin for all readings Use thi...

Page 127: ...DE KEY BOARD SECTION SIDE KEY BOARD SECTION c To Ft IR J2 P101 SW102 SW104 SW106 SW105 SW108 SW107 SW103 Main Power Button In On Out Off Side Key Board Layout Component Identification Side Key Board Layout Component Identification SW101 ...

Page 128: ... Ft Key board contains the Master Power Switch Volume Up Down and Channel Up Down keys Also the Menu and Select keys Side Key Board Layout Side Key Board Layout Front View Rear View To Front LED Board Pin P101 Main Power Switch P101 P101 ...

Page 129: ... LED Control Board J2 No Key Pressed STBY 1 Main Power Switch Out Diode Mode Readings taken with all connectors Disconnected Black lead on Gnd DVM in Diode Mode Menu Enter Volume Volume KEY 1 56V 2 2V 0 19V 0 86V Pin 3 measured from Pin 1 0 88V 1 57V 0 19V Pin 4 measured from Pin 1 Input CH Dn CH Up KEY STBY 2 Main Power Switch In Pin P101 Open 3 3V 0V 0V KEY 1 4 Open Gnd Gnd 4 38V PWR SW 2 Open G...

Page 130: ...M in Diode Mode INVISIBLE SPEAKER SECTION INVISIBLE SPEAKER SECTION The picture above shows the additional plastic support Housing Under the speaker Speaker Housing Housing At the top of the speaker is a rubber cushion Be sure to return this to its proper position to prevent vibrations Speaker Bottom of TV Cushion Cushion Screw Screw Bottom of TV p n EAB58534501 Full Range 10W 8OHM 83DB 100HZ 160 ...

Page 131: ...ts off at 17V then very quickly drops to 5V 4 Floating Ground 5V and 15V are not produced See pages 60 61 for more details 5 Removing all connectors on the Z SUS board Except the panel connectors does not change test results 6 Removing Y Drive boards cause all voltages to return to normal Including the Y Drive signal checked on the right side of C213 7 Reconnecting all connectors on the Z SUS boar...

Page 132: ...s did not work Except the Main Power Switch CHECKS 1 Main Board Reading the Key 1 and Key 2 lines found that Key 2 was at 0 8V Key 1 read normal at 3 3V See page 124 for more details 2 Feeling the Function buttons found that the right hand button as viewed from the rear did not feel the same as the others It was stuck FIX 1 Removing and repositioning the button assembly freed up the button The set...

Page 133: ...ng which Y Drive board is defective using the checks shown in the Y Drive section the other board can be tested separately If the Upper Y Drive is found defective the Lower Y Drive board can be tested Remove the Upper Y Drive Disconnect the Connector P209 Turn on the set and confirm that the bottom half of the picture looks normal If the Lower Y Drive is found defective the Upper Y Drive board can...

Page 134: ...ed CHECKS 1 Look careful the connections between the Y SUS and Upper and Lower Y Drive boards It is very possible that the can be improperly seated FIX 1 Remove and reseat the board correctly 2 Note This can happen if either the Y SUS or Y Drive boards are replaced or pulled off to perform checks Improperly Seated Connector Note the pins are visible across the top inside of the connector Properly ...

Page 135: ...ction 11 X 17 Foldout Section 50PQ30 INTERCONNECT DIAGRAM SECTION 50PQ30 INTERCONNECT DIAGRAM SECTION For Printing purposes choose the 11X17 paper size For Printing purposes choose the 11X17 paper size The Interconnect Diagram has a great deal of quick reference The Interconnect Diagram has a great deal of quick reference servicing aids Use this in conjunction with the Training Manual servicing ai...

Page 136: ...01 FS201 10A 125V D502 D503 D501 Q503 FS201 10A 125V M5V 17V Va Floating Gnd Floating Gnd Floating Gnd Floating Gnd P 10 7 P 10 9 P 10 6 P201 P202 P203 Y Drive Lower P101 P102 P103 Y Drive Upper P108 P209 C105 C205 FL201 FG5V P208 P206 P109 P106 P107 12 Vscan 134V 11 VScan 134V 10 n c 9 FG5V 5V 8 FG5V 5V 7 FGnd 6 Clk 0 9V 5 STB 2 3V 4 OC1 2 2V 3 DATA 0V 2 OC2 2 9V 1 FGnd 12 FGnd 11 OC2 10 DATA 9 O...

Page 137: ...DS Pin 11 2uSec 718mV P1003 LVDS Pin 11 5uSec 718mV P1003 LVDS Pin 12 2uSec 565mV P1003 LVDS Pin 12 5uSec 565mV P1003 LVDS Pin 13 2uSec 479mV P1003 LVDS Pin 13 5uSec 479mV P1003 LVDS Pin 14 2uSec 594mV P1003 LVDS Pin 14 5uSec 594mV P1003 LVDS Pin 15 2uSec 648mV P1003 LVDS Pin 15 5uSec 648mV P1003 LVDS Pin 16 2uSec 414mV P1003 LVDS Pin 16 5uSec 414mV P1003 LVDS Pin 17 2uSec 717mV P1003 LVDS Pin 17 ...

Page 138: ... Digital CH Off Analog 6 3 28V Pin Reg 10 3 3V 6 4 6V Q501 3 3V VMST 7 0V Gnd Gnd 11 n c 7 3 3V Pin Switch Ctl Q601 RS232 TX 8 3 28V In 0V 3 3V 12 n c 8 4 6V B 0V 0 6V Pin Buffer Out 0V 1 2V 13 n c E 0V B 0 6V IC301 5VST to 14 5 6V C 3 3V 0V E Gnd 3 3V VST 15 0V On Digital CH Off Analog C 0V Pin Reg 16 3 3V 1 Gnd D1001 For IC1001 3 3V D627 RS232 TX Noise D628 RS232 RX Noise D633 RGB B 2 3 3V Pin S...

Page 139: ...134 Preliminary Information 50PQ30 This concludes the Presentation Thank You End of Presentation End of Presentation ...

Search results

Summary of Contents for 50PQ30 Series

Reviews:

Related manuals for 50PQ30 Series

Brands by name

Popular brands

LG 50PQ30 Series, Training Manual

Search results

Summary of Contents for 50PQ30 Series

Reviews:

Related manuals for 50PQ30 Series

Brands by name

Popular brands