LG 42PQ30 Series Training Manual Download Page 24

Page: 24 / 124

Preliminary Information 42PQ30

Left and Right X Drive Removal

Showing the tape on the connectors P232 or P331

Peel the tape off the connectors

Gently pry the locking mechanism upward and remove the ribbon cable from the connector.

Gently lift the locking mechanism upward on all

TCP connectors P201~206 or P301~306

Carefully lift the TCP ribbon up and off.

Flexible ribbon cable

After removing the back cover, Main PWB is lifted out of the way, 6 screws removed from heat sink covering
heat sink and TCPs removed, the X-Drive PWBs can be removed.

Cushion (Chocolate)

Removing TCPs.

TCP

Summary of Contents for 42PQ30 Series

Page 1: ...hooting Training Manual 42PQ30 Plasma Display 42PQ30 Plasma Display 720p 720p NOTICE ALL INFORMATION CONTAINED WITHIN THIS PACKAGE IS BASED ON PRE SALES MODEL INFORMATION SUBJECT TO CHANGE AT FINAL PRODUCTION PRELIMINARY PRELIMINARY ...

Page 2: ...US PWB Control Board X Drive Boards 2 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 deactivates all inputs from IR or Keys NEW ...

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 Ass...

Page 4: ...LG 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 p...

Page 5: ...evice 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 ther...

Page 6: ... 0000 Technical Support and Part Sales 800 847 7597 USA Website GCSC aic lgservice com Customer Service Website us lgservice com LG CS Academy lgcsacademy com LG Web Training lge webex com Published March 2009 by LG Technical Support and Training LG Electronics Alabama Inc 201 James Record Road Huntsville AL 35813 ...

Page 7: ...cause 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 vertical NOT horizontal 7 Exercise care when making voltage and waveform checks to preven...

Page 8: ...gh 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 determi...

Page 9: ...9 Preliminary Information 42PQ30 This section of the manual will discuss the specifications of the 42PQ30 Advanced Single Scan Plasma Display Panel 42PQ30 Product Information 42PQ30 Product Information ...

Page 10: ...720p HD Resolution Dual XD Engine 20 000 1 Contrast Ratio Fluid Motion 3x HDMI V 1 3 with Deep Color AV Mode Cinema Sports Game Clear Voice LG SimpLink Connectivity Invisible Speaker System 100 000 Hours to Half Brightness Typical PC Input 720P PLASMA HDTV 42 Class 41 5 diagonal ...

Page 11: ...igh 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 improves the da...

Page 12: ...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 13: ...Time is 5 44 milliseconds Panel Response Time is less than 1 millisecond FluidMotion 180 Hz Effect Enjoy smoother clearer motion with all types of programming such as sports and action movies The moving picture resolution give the impression of performance of up to 3x the panels actual refresh rate 42PQ30 Specifications 42PQ30 Specifications FluidMotion FluidMotion Familiarization Familiarization ...

Page 14: ...14 Preliminary Information 42PQ30 42PQ30 Remote Control 42PQ30 Remote Control TOP PORTION BOTTOM PORTION ...

Page 15: ...15 Preliminary Information 42PQ30 Rear and Side Input Jacks Rear and Side Input Jacks AC In USB Software Upgrades ...

Page 16: ... lb Weight with Stand 54 7 lb 25 13 16 655 3mm 40 1 2 1028 7mm 15 3 4 400mm Remove 4 screws to remove stand for wall mount Model No Serial No Label 12 3 16 310mm 23 5 8 600mm 28 5 16 718 8mm 3 1 8 78 7mm 12 1 8 307 3mm 15 3 4 400mm 4 1 8 104mm 5 13 16 148mm 2 9 16 65mm Center Wattage Avg 181W Stby 0 13W 16 15 3 4 400mm 12 13 16 325mm ...

Page 17: ...t Board Identification of the 42PQ30 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 18: ... 42PQ30 Removing 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 19: ...rd Layout Y SUS PWB Z SUS PWB Right X Left X Main PWB Control PWB Power Supply SMPS PWB FPC FPC Panel ID Label Panel Voltage Label Y Drive Control Keys Master Power FPC Invisible Speakers FPC FPC FPC FPC FPC TCP Heat Sink AC In Conductive Tape Under Main PWB Side Input part of main ...

Page 20: ...t Board Removal Disassembly Procedure for Circuit Board Removal Disconnect the following connectors P201 P206 P101 P202 Remove the 7 screws holding the PWB in place Remove the PWB by lifting slightly and sliding it to the right When replacing be sure to readjust the Va Vs voltages in accordance with the Panel Label Confirm VSC Vy and Zbias as well Disconnect the following Flexible Ribbon Connector...

Page 21: ...nectors P301 P1001 P1002 and P1005 Remove the 1screws holding on the decorative plastic piece on the right side Remove the 4 screws holding the PWB in place and Remove the PWB Disconnect the following connectors P121 LVDS P101 P111 Ribbon P161 Ribbon and P162 Ribbon Remove the 4 screws holding the PWB in place Remove the PWB X Drive Boards Removal Disconnect the following connectors P232 P211 P311...

Page 22: ... P1005 D Remove the 4 screws from the Main Board Mounting Bracket Note Decorative Plastic Piece on right does not need to be removed 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 13 screws holding the Heat Sink X DRIVE PWBs REMOVAL Disconnect a...

Page 23: ...etting to the X Circuit Boards Getting to the X Circuit Boards A D C E Right E Left F Heat Sink B B Warning Never run the TV with the TCP Heat Sink removed Warning Shorting Hazard Conductive Tape Do not allow to touch energized circuits ...

Page 24: ...anism upward and remove the ribbon cable from the connector Gently lift the locking mechanism upward on all TCP connectors P201 206 or P301 306 Carefully lift the TCP ribbon up and off Flexible ribbon cable After removing the back cover Main PWB is lifted out of the way 6 screws removed from heat sink covering heat sink and TCPs removed the X Drive PWBs can be removed Cushion Chocolate Removing TC...

Page 25: ...Generic Removal Precautions TCP Connector Removal Lift up the lock as 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 Note These picture are taken from a different model But the precautions are the same ...

Page 26: ...nd Right X Drive Removal Left and Right X Drive Removal Remove the 4 screws for either PWB or 7 total for both The Center screw secures both PWBs Right X Board drive the left side of the screen Left X Board drives the right side of the screen ...

Page 27: ...rds 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 SECTION 2 CIRCUIT OPERATION TROUBLESHOOTING AND SECTION 2 CIRCUIT OPERATION TROUBLESHOOTING AND CIRCUIT ALIGNMENT S...

Page 28: ...tage Det Vs and Er Com Logic Signals P160 P301 P1002 P1001 P1001 MAIN PWB Speakers X PWB Right X PWB Left P201 P202 P203 P204 P205 P206 P301 P302 P303 P304 P305 P306 RGB Logic Signals Va RGB Logic Signals Va CONTROL PWB P162 LVDS Y Drive PWB Z SUS PWB P161 P121 P206 P6 P7 P232 P211 P311 P331 Display Panel Vertical Address Vs Display Panel Horizontal Address Reset 5V 17V Relay On M5 On VS On STB 5V...

Page 29: ...usting 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 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 30: ...is replaced Check Va Vs since the SMPS does not come with new panel 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...

Page 31: ...ize category Set Up and Ve are just for Label location identification and are not adjusted in this panel SWITCH MODE POWER SUPPLY Troubleshooting SWITCH MODE POWER SUPPLY Troubleshooting 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 o...

Page 32: ...EAY58349601 Check the silk screen label on the top center of the PWB of the Power Supply itself to identify the PWB P N We will examine the Operation of this Power Supply Switch Mode Power Supply Part Number Switch Mode Power Supply Part Number ...

Page 33: ...d Hot Ground Hot Ground VR502 Va VR901 Vs 1 T901 F302 8A 250V 1A 250V Stby 338V Run 388V 4A 250V Stby 338V Run 388V Both F801 and F302 read from Hot Gnd Primary Bridge Rectifier 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 22 1 17V 23 Stby5V 24 17V Gnd 12V Gnd 5V 5V Gnd N C AC Det VS ON Auto Gnd Key On P813 P811 Hot Ground Represents a Shock Haza...

Page 34: ...Grid Used to develop Bias Voltages on the Y SUS X Drive and Control Boards 16V Audio B Supply 5V Signal Processing 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 RV901 RV951 Switch Mode Power Supply Overview Switch Mode Power Su...

Page 35: ...STBY 5V 17V 12V Source IC701 Sub Micon VA VR502 Switch Mode Power Supply Circuit Layout Switch Mode Power Supply Circuit Layout PFC Circuit To MAIN P813 Main Fuse F101 6 3Amp 250V 4Amp 250V P811 To Y SUS 338V Stby 388V Run Fuse F801 1Amp 250V Main Bridge Rectifier 338V Stby 388V Run Fuse F302 ...

Page 36: ... ON enters the SMPS Board Pin 19 of P813 At the same time the 5V General voltage also creates a signal called 5V Det This is routed to the main Micon and to the SMPS Pin 17 PG813 notifying the SMPS sub Micon that the main board is functioning The RL ON Voltage is sensed by the Sub Micon IC701 circuit which causes the Relay Drive Circuit to close both Relays RL101 and RL103 bringing the PFC source ...

Page 37: ...d By 5V Reg 1 2 3 5 5 6 6 7 11 8 2 5 4 Both LEDs On Looks Amber At point TV is in Stand By state Energy Star compliant Less than 1 Watt 42PQ30 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB 42PQ30 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB 5 5 7 In Stand By Primary side is 90V In Run Relay On Primary side is 370V 3 Turns on Red LED 3 16V Audio 12V 17V AC Det 7 11 37 5V and 15V From Y SUS to 15V 5V V...

Page 38: ...oblem with the SMPS or an excessive load on the line The next step of operation calls for the M5V ON line from the Main Board to the SMPS to go high on P813 pin 21 A high on the M5V ON Line activates the M5V line to the Y SUS Board Loss of M5V results in no Raster no Display Panel Reset no Y Z Control or X Board operation Loss of M5V and or M5V ON going high could be caused by any of these boards ...

Page 39: ...wer Supply Static Test If the Y SUS Z SUS and X PWBs are working normal when the SMPS comes up to full power on Display Panel Reset will be visible Shorting the Auto Pattern Gen test points at this time should result with test patterns on the screen If either Y SUS or Z SUS is causing the power supply to shutdown unplug the Z SUS Remember Vs is routed to the Z SUS PWB P3 from the Y SUS P206 pins 1...

Page 40: ...bs turn on allow the the SMPS to run for several minutes to be sure it will operate under load If this test is suscessful and all other voltages are generated you can be assured the power supply is OK Vs Gnd Also check Pins 6 or 7 for proper Va Note The light bulb test is not necessary for the SMPS to turn on and stay on This SMPS will run without a load But it is necessary to test the SMPS under ...

Page 41: ...12 are 5V B 100Ω watt resistor added from 5V STB Pins 9 12 to RL ON Pin 19 closes relay RL101 and RL103 turning on the 17V and 12V Supplies BC 100Ω watt resistor added from 5V STB Pins 9 12 to M5 ON Pin 21 brings the M5V P811 pins 9 10 line high D 100Ω watt resistor added from 5V STB Pins 9 12 to VS ON Pin 20 brings the VA and VS P811 pins 1 and 2 Vs and Pins 6 and 7 Va Lines high Remove AC apply ...

Page 42: ...ly will come up and run with NO load on P811 But check using 200W light bulb test Use Full White Raster White Wash SMPS Va and Vs Adjustments SMPS Va and Vs Adjustments With P811 in circuit Y Z SUS Run Both Y and Z waveforms are generated Va TP P811 Pin 6 or 7 Important Use the Panel Label Not this book for all voltage adjustments ...

Page 43: ... 2 99V 5V 0V M5V 10 2 99V 5V 0V M5V 9 Gnd 0V 0V Gnd 8 Open 60V 0V Va 7 Open 60V 0V Va 6 Gnd 0V 0V Gnd 5 n c n c n c n c 4 Gnd 0V 0V Gnd 3 Open 194V 0V Vs 2 Open 194V 0V Vs 1 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...

Page 44: ... 1V 5V 15V 5V Det 17 Gnd Gnd Gnd Gnd 15 Gnd Gnd Gnd Gnd 13 1 1V 5V 5V 5V 11 1 1V 5V 5V 5V 9 Gnd Gnd Gnd Gnd 7 Open 12V 0V 12V 5 Gnd Gnd Gnd Gnd 3 Open 17 3V 0V 17V 1 Diode Mode Run STBY Label Pin Open Gnd Gnd Auto Gnd 22 Open 0V 0V Key On 24 Open 3 2V 0V VS On 20 1 0V 5V 5V AC Det 18 Not Used Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd 14 1 1V 5V 5V 5V 12 1 1V 5V 5V 5V 10 Gnd Gnd Gnd Gnd 8 Open 12V 0V 12V 6 Gn...

Page 45: ... VR501 V SET UP VR601 V SET DN VR602 15V Floating Ground FG 5V VA supplies the Panel Vertical Grid Routed to the X Boards VS Supplies the Panel Horizontal Grid Also routed to the Z SUS 5V Supplies Bias to Y Z SUS Routed to the Control Board VY Sets the Negative excursion of the Y SUS Drive Waveform VSC Set the amplitude of the complex waveform Ramp UP sets amplitude of the Top Ramp of the Drive Wa...

Page 46: ... Control PWB P202 Va to Left X Board Pins 1 2 and 3 Vs to Z SUS P208 P205 P207 VSC TP R520 J263 VY ADJ VR502 VSC ADJ VR501 FS202 Vs 4A 250V SET UP VR 601 V SET DN VR 401 5V and 15V FS203 Va 10A FS201 5V 4A VY TP R201 15V TP J269 P203 P208 and P205 All Floating Ground P206 Floating Gnd 5V Pins 4 and 5 P207 Pins 1 and 2 Y Scan signal Pins 7 8 9 10 and 11 Logic Drive Signals to the Y Drive PWBs Y Dri...

Page 47: ... 4 or 5 P207 P207 Pins 1 and 2 Y Scan signal P207 Pins 7 8 9 10 and 11 Logic Drive Signals to the Y Drive PWBs P104 c c Y Drive Board Y SUS Board Bottom Connector P207 P205 1 Scan Sig 2 Scan Sig 3 n c 4 5V FG 5 5V FG 6 SUS Dn 7 CLK 8 STB 9 OC1 10 DATA 11 n c 12 SUS_Dn FL1 Use the Left Side of C213 to test for Y Scan signal ...

Page 48: ...at Sinks Vy TP R201 Voltage Reads Positive VR501 VR502 Vy TP Set should run for 15 minutes this is the Heat Run mode Set screen to White Wash mode or 100 IRE White input Adjust Vy to Panel Label voltage 1V Adjust VSC to Panel Label voltage 1V Lower Left Side of PWB VSC TP R520 J263 Vy VSC CAUTION Use the actual panel label and not the book for exact voltage settings Vsc TP R520 J263 ...

Page 49: ...nal from waveform above observed 400uS div e Highlighted signal from waveforms above observed 100uS div 528V p p NOTE The Waveform Test Point is 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 NOTE The two test points just below and to the left will also work for the Y Drive waveform Test Point 100uS ...

Page 50: ... UP is outlined within the Waveform Fig 3 At 400us per div the signal for SET UP is now easier to recognize It is outlined within the Waveform Fig 4 At 40uSec per division the adjustment for SET UP can be made Fig 2 At 2mSec per division the waveform to use for SET UP Is now becoming clear FIG1 4mS FIG2 2mS FIG3 400uS Area to be adjusted Area to be adjusted Area to be adjusted Outlined Area Blanki...

Page 51: ... is outlined within the Waveform Fig 3 At 400us per div the signal for SET DN is now easier to recognize It is outlined within the Waveform Fig 4 At 40uSec per division the adjustment for SET DN can be made Fig 2 At 2mSec per division the waveform to use for SET DN is now becoming clear FIG1 4mS FIG2 2mS FIG3 400uS Area to be adjusted Area to be adjusted Area to be adjusted Outlined Area Blanking ...

Page 52: ...rmally they do not have to be done V V Set Up and V Set Up and V Set Down Adjustments Set Down Adjustments Y Drive PWB Test Point ADJUSTMENT LOCATION Just to the bottom right of the right hand heat sink SET UP ADJUST 1 Adjust VR601 and set the A portion of the signal to match the waveform above SET DN ADJUST 2 Adjust VR401 and set the B time of the signal to match the waveform above ...

Page 53: ...storted Vset UP The peek widens due to the Vset UP peeking too quickly The center begins to wash out and arc due to Vset UP Peeking too late and alters the start of the Vset DN phase Panel Waveform Adjustment Ramp Vset UP too high Ramp Vset UP too low V Set Up Too High or Low V Set Up Too High or Low ...

Page 54: ... due to decreased Vset DN time Panel Waveform Adjustment Vset DN too high Vset DN too low V Set V Set Dn Dn Too High or Low Too High or Low Vset Dn swing is Minimum 110uS Max 200uS NOTE If Vset DN too high this set will go to excessive bright then shutdown To correct remove the LVDS from control PWB and make necessary adjustments ...

Page 55: ...Ramp Up Down Control Board Circuits generate Y Sustain Waveform Distributes 15V and 5V Logic signals needed to generate drive waveform Distributes VA Receive M5V Va Vs from SMPS Y Drive Board Receives Scan Waveform Display Panel Power Supply Board SMPS FETs amplify Sustain Waveform Left X Board Z SUS Board Distributes 15V Generates Floating Ground 5V by DC DC Converters ...

Page 56: ...e 1 3V Forward 0 39V 0 5V Reverse Open IRGP4086 IRGP4086 Forward 0 38V Reverse Open Forward 0 39V 0 5V Reverse Open IRGP4086 IRFP4332 Forward 1 6V Reverse Open Forward 0 6V 0 7V Reverse 1 3V IRGP4086 RF2001 Forward Shorted Reverse Shorted RF2001 Forward 0 4V Reverse Open 30N45T Forward 0 6V Reverse Shorted 30N45T Forward 0 6V Reverse Shorted K3667 Forward 0 4V 0 5V Reverse Open K3667 Forward 0 22V...

Page 57: ...P812 Plug Information SUS P201 to SMPS P812 Plug Information Note This voltage will vary in accordance with Panel Label 1 1V 5V 0V M5V 10 1 1V 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 PWB P811 ...

Page 58: ...Mode Y Y SUS P202 to X Drive P211 and P311 Plug Information SUS P202 to X Drive P211 and P311 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 PWB to X Drive Left P233 ...

Page 59: ...Y Y SUS P801 to Z Drive P1 Plug Information SUS P801 to Z Drive P1 Plug Information Note This voltage will vary in accordance with Panel Label Gnd 193V 0V VS 8 Open 193V 0V VS 7 nc nc nc nc 6 Gnd Gnd Gnd Gnd 5 Gnd Gnd Gnd Gnd 4 nc nc nc nc 3 Open 94 9V 0V Er Com 2 Open 94 9V 0V Er Com 1 Diode Mode Run STBY Label Pin P206 Connector Y SUS to Z Drive P1 Plug Information ...

Page 60: ...e PWB Actually a 30 Pin Connector Measurements can be made on the Control PWB Y SUS Board B checks for the P101 connector FS201 5V to run the Control Board Also sent to the Z SUS Board Routed through the Control Board Leaves the Control Board on P101 pins 10 FS501 15V to run the Z SUS Board Routed through the Control Board Leaves the Control Board on P101 pins 11 and 12 Run 5V Standby 0V Diode Che...

Page 61: ... STBY Label Pin Open 15V 0V 15V 30 0 44V 5V 0V 5V 28 0 44V 5V 0V 5V 26 0 44V 5V 0V 5V 24 Gnd Gnd Gnd Gnd 22 Gnd Gnd Gnd Gnd 20 Open 0V 0V n a 18 0 65V 0V 0V n a 16 0 65V 0V 0V n a 14 0 65V 2 5V 0V n a 12 0 65V 0 17V 0V n a 10 0 65V 1 05V 0V n a 8 0 65V 0 2V 0V n a 6 0 65V 0 13V 0V n a 4 0 65V 0 12V 0V n a 2 Diode Mode Run STBY Label Pin Diode Mode Readings taken with all connectors Disconnected DV...

Page 62: ...N FGnd 7 CLK 0 96V 8 STB 2 3V 9 OC1 2 3V 10 DATA 0V 11 Nc 12 SUS_DN FGnd n All voltages taken from Floating Ground All voltages taken from Floating Ground Warning Do not hook scope ground up unless set plugged into an Warning Do not hook scope ground up unless set plugged into an isolation transformer isolation transformer P207 Pin Label Voltage ...

Page 63: ...G THE Y SUS PWB SUS PWB Disconnected from the Y Disconnected from the Y DRIVE PWB DRIVE PWB Readings from Floating Ground Pin 1 RED LEAD Blk Lead FG BLACK LEAD Red Lead FG 1 VSC 2 VSC 3 nc 4 FG 5V 5 FG 5V 6 SUS Dn 7 CLK 8 LE 9 OC1 10 Data 11 nc 12 SUS Dn Open Open Open 1 78V 1 78V 0V 1 57V 1 57V 1 67V 1 57V 1 67V 0V Open Open Open 0 52V 0 52V 0V 0 59V 0 59V 0 63V 0 59V 0 65V 0V Floating Gnd Floati...

Page 64: ...Panel through SCAN DRIVER IC s The Y Drive Boards supply a waveform which selects the horizontal electrodes sequentially 42PQ30 uses 8 DRIVER ICs on 1 Y Drive Board Y Y DRIVE PWB SECTION Y DRIVE PWB SECTION Y Drive Explained Drive Explained Y DRIVE WAVEFORM To facilitate scope attachment solder a small wire Stand Off at this point Y DRIVE WAVEFORM TEST POINT ...

Page 65: ...D Y Drive PWB ID Y Drive and Logic Signals Clock and Data from the Y SUS Board TOP BOTTOM Check 5V supply using FL1 or across C18 Measured from Floating Ground Floating Ground from the Y SUS Board P101 P103 P102 and pins 1 and 7 of P104 Y SUS SIDE P103 P102 P104 Y Drive Scan Signal Input Y Drive Scan VSC Signal Input TP Or measure at Pins 1 and 2 of P104 FL1 PANEL SIDE ...

Page 66: ... from Floating Ground Ground Warning Do not Warning Do not hook scope ground hook scope ground up unless set up unless set plugged into an plugged into an isolation isolation transformer transformer 1 VSC 140V 2 VSC 140V 3 Nc 4 5V VF 5V 5 5V VF 5V 6 SUS_DN FGnd 7 CLK 0 96V 8 STB 2 3V 9 OC1 2 3V 10 DATA 0V 11 Nc 12 SUS_DN FGnd Pin Label Voltage n ...

Page 67: ...KING THE Y DRIVE PWB DRIVE PWB Disconnected from the Y Disconnected from the Y SUS PWB SUS PWB Readings from Floating Ground Pin 1 RED LEAD Blk Lead FG BLACK LEAD Red Lead FG 12 VSC 11 VSC 10 nc 9 FG 5V 8 FG 5V 7 SUS Dn 6 CLK 5 LE 4 OC1 3 Data 2 nc 1 SUS Dn 1 15V 1 15V Open 0 4V 0 4V 0V 0 5V 0 5V 0 5V 0 62V 0 48V 0V Open Open Open Open Open 0V 2 9V 2 9V Open Open Open 0V Floating Gnd Floating Gnd ...

Page 68: ...To reinstall the Ribbon 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 from Y Drive Removing Panel Flexible Ribbon from Y Drive Flexible Ribbon Cables shown are from a different model but pro Flexible Ribbon Cables shown are from a different model but ...

Page 69: ...l 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 Y Drive Flexible Ribbon Incorrectly Seated Y Drive Flexible Ribbon Incorrectly Seated ...

Page 70: ...AD ON ANY OUTPUT LUG 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 buffer 6 Ribbon cables Horizontal Grids 768 Total Horizontal Grids controlling Vertical resolution B...

Page 71: ... of the Y Z Z SUS Board SUS Board Assembly Upon completion of this section the Technician will ha Assembly Upon completion of this section the Technician will have a better understanding of the ve a better understanding of the circuit and be able to locate voltage and resistance test points circuit and be able to locate voltage and resistance test points needed for troubleshooting and needed for t...

Page 72: ...ard Layout P6 Logic Signals from the Control PWB Also 15V and 5V P2 VZ Z Bias TP Right side R49 or R50 Read the Label on the back of the upper left hand side of the panel Z SUS Output ICs Z Bias ADJ VR8 No IPMs P7 FPC FPC Z SUS Waveform Development ICs Z SUS Waveform Test Point J27 Z Bias ...

Page 73: ...Circuit Oscilloscope Connection Point J27 to check Z Output waveform Right Hand side Center Z Z SUS Waveform SUS Waveform Z Bias is a DC adjustment The effects of this adjustment can be observed on the scope looking at the Z SUS output Z SUS PWB This Waveform is just for reference to observe the effects of Zbz adjustment Vzb voltage 1V 80 V Z Drive Waveform Vzb Z Bias VR8 400uS div 50V div Note Th...

Page 74: ... or R50 Read the Label on the back of the upper left hand side of the panel Adjust using VR8 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 Z Bias Bottom Center of Z SUS Board VR8 Measured from Chassis Ground ...

Page 75: ...am Circuits generate erase sustain waveforms Generates Z Bias 100V Distributes Logic Signals M5V VA VS FET Makes Drive waveform Display Panel Via FPC flexible printed circuit Control Board Y SUS Board NO IPMs POWER SUPPLY Board 5V 15V 5V 15V Z SUS PWB Receives VS from Y SUS and 15V 5V from Control PWB ...

Page 76: ...oltages and Resistance SUS P206 Voltages and Resistance Voltage and Diode Mode Measurements Note This voltage will vary in accordance with Panel Label Open 193V 0V VS 8 Open 193V 0V VS 7 Open nc nc nc 6 Gnd Gnd Gnd Gnd 5 Gnd Gnd Gnd Gnd 4 Open nc nc nc 3 Open 94 9V 0V ER COM 2 Open 94 9V 0V ER COM 1 Diode Mode Run STBY Label Pin P3 CONNECTOR Z SUS PWB to Y SUS Out P206 ...

Page 77: ...ges and Resistance Voltage and Diode Mode Measurements Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd 9 Open 4 9V 0V 5V 10 Open 16 9V 0V 15V 11 Open 16 9V 0V 15V 12 Open 1 9V 0V CTRL_OE 7 Open 0 8V 0V OE 6 2 8V 1 9V 0V Z BIAS 5 2 8V 0 4V 0V Z ER DN 4 2 8V 0 19V 0V Z ER UP 3 2 8V 0 13V 0V Z SUS UP 2 2 8V 0 79V 0V Z SUS DN 1 Diode Mode Run STBY Label Pin P2 CONNECTOR Z SUS PWB to Control P101 Pin 1 on Left side ...

Page 78: ...rol board 2 3 3V This Section 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 resistance test points needed for troubleshooting Main Board Supplied LVDS Signal Operating Voltages Operating Voltages Control Board Generated Y and Z Sustain Drive S...

Page 79: ...trol PWB Identified Control PWB Identified Waveform Generation Software Download Connection To P101 Y SUS Part Number Label n c 5V 1 8V 0V 4 8V 0V 3 3V 5V To P2 Z SUS P101 To P1002 Main ROM IC101 Vs DA 3 2V FL111 FL112 5V 3 3V 3 3V 0V 3 3V 1 3 3V 2 0V 3 3 3V 4 0V 5 3 3V 6 3 3V 7 0V 8 3 3V IC1 EEPROM FL204 1V Protect 1V 3 3V IC211 IC201 MCM IC252 IC221 IC1 Pin 1 ...

Page 80: ...80 Preliminary Information 42PQ30 Control PWB Pictorial Control PWB Pictorial Note IC221 3 3V Regulator routed out P161 P162 to X PWBs ...

Page 81: ...is can be checked by the following 1 Disconnect the Main PWB 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 PWB X Boards TCPs and Panel are all OK Use the same test for problem 2 above to tell if the No V...

Page 82: ...ency 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 PWB CRYSTAL LOCATION X101 ...

Page 83: ...d off with 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 PWB shown Press two outside tabs inward to release Control LVDS Signals Control LVDS Signals Connector P1002 Configuration indicates signal pins P1002 on Main Board 1 3 5 7 9 11 13 15 17 19 ...

Page 84: ... TCP Tape Carrier Package ICs If there is a bar defect on the screen it could be a Control Board problem MCM 16 line Resistor Array 256 Lines output Total Basic Diagram of Control Board Control Board to X Board Address Signal Flow IC201 Control PWB Signal Block Control PWB Signal Block MCM IC201 DRAM 2 Buffer Outputs per TCP CONTROL PWB X DRIVE PWB PANEL 128 Lines per Buffer To X Drive Boards EEPR...

Page 85: ...as 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 PWB Removing the LVDS Cable from the Control PWB Press Inward Press Inward ...

Page 86: ...close together When taking Voltage measurements use Caution Pins 3 4 5 6 and 7 Receive 5V from the Y SUS 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 Drive logic signals to the Y SUS Board The 15V 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 Pins ...

Page 87: ...side is 1 15 and the right side is 16 30 however this is not correct Use the normal Left Side Odd and Right Side Even pin configuration Example Pin c Odd Pins Even Pins Pin d 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 88: ... STBY Label Pin Gnd Gnd Gnd Gnd 30 3 2V 0 1V 0V CTRL_OE 28 2 8V 1 28V 0V Dummy 4 26 2 8V 0V 0V Dummy 3 24 2 8V 0 6V 0V CLK 22 2 8V 2 96V 0V STB 20 2 8V 1 4V 0V BLK 18 2 8V 0V 0V Data 16 2 8V 1 89V 0V OC2 14 2 8V 2 16V 0V Dummy 2 12 Gnd Gnd Gnd Gnd 10 Gnd Gnd Gnd Gnd 8 0 97V 5V 0V 5V 6 0 97V 5V 0V 5V 4 Open 15V 0V 15V 2 Diode Mode Run STBY Label Pin Diode Mode Readings taken with all connectors Dis...

Page 89: ...2V 0V Z Bias 5 0 65V 0 3V 0V Z ER Dn 4 0 65V 0 16V 0V Z ER Up 3 0 65V 0 18V 0V Z SUS Up 2 Open 0 75V 0V Z SUS Dn 1 Diode Mode Run STBY Label Pin Diode Mode Readings taken with all connectors Disconnected DVM in Diode Mode Control P101 to Z Control P101 to Z SUS P2 Plug Information SUS P2 Plug Information P101 CONNECTOR Control PWB to Z SUS P2 Pin 1 at the bottom of the connector ...

Page 90: ...re covered with tape for transportation issues Tape can be removed Control PWB Connector P161 and P162 to X Control PWB Connector P161 and P162 to X Drive PWBs Drive PWBs Tape removed 3 3V TP 3 3V TP 3 3V TP The rest of the pins are much too close together for a safe test P161 P162 3 3V created by IC221 ...

Page 91: ...e isn t many active components on the X Drive PWBs Printed Circuit Boards So they are not 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 GRIDS WHICH DETERMINE THE HORIZONTAL PIXEL COUNT TOTAL HORIZONTAL GRIDS 3072 TOTAL HORIZONTAL PIXELS ...

Page 92: ...e Commonly known as A BUS BUS TCP IC s shown are part of the Ribbon Cable TCP IC TCP IC 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 P233 P211 P232 P331 P311 LEFT X BOARD RIGHT X BOARD ...

Page 93: ...ctrode 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 94: ...ypical Reading 0 65V 5 10 15 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 Reading Open ...

Page 95: ...C221 for 3 3V use center pin Warning DO NOT attempt to run the set with the Heat Sink over the TCPs removed IC221 5V 3 3V 0V P232 P331 Top C231 Left C206 Left C307 Top C363 Check for 3 3V 3 3V Check for 3 3V Left X PWB Right X PWB 3 3V in on Pins 49 50 51 3 3V in on Pins 49 50 51 ...

Page 96: ... 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 97: ...Connector P211 Voltages and Resistance X Drive Left Connector P211 Voltages and Resistance Note This voltage will vary in accordance with Panel Label Open 64 9V 0V VA 8 Open 61 4V 0V VPP ER1 7 Open 61 4V 0V VPP ER1 6 n a n a 0V n c 5 n a n a 0V n c 4 Open 15 4V 0V 15V 3 Gnd Gnd 0V Gnd 2 Gnd Gnd 0V Gnd 1 Diode Mode Run STBY Label Pin P211 CONNECTOR X Drive Left to X Drive Right P311 ...

Page 98: ...Connector P311 Voltages and Resistance X Drive Right Connector P311 Voltages and Resistance Note This voltage will vary in accordance with Panel Label Open 64 9V 0V VA 8 Open 61 4V 0V VPP ER2 7 Open 61 4V 0V VPP ER2 6 n a n a 0V n c 5 n a n a 0V n c 4 Open 15V 0V 15V 3 Gnd Gnd Gnd Gnd 2 Gnd Gnd Gnd Gnd 1 Diode Mode Run STBY Label Pin P311 CONNECTOR X Drive Right to X Drive Left P211 ...

Page 99: ...tor 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 100: ...ion of this Section the technician will have a better understanding of the operation of the circuit and will be able to locate voltage and resistance test points needed for troubleshooting and alignments 5V 3 3V 2 2 5V 1 8V 5V Stand By 12V 16V Developed on the Main Board DC Voltage and Waveform Checks Resistance Measurements Main PWB Troubleshooting Main PWB Troubleshooting ...

Page 101: ...To Power Supply HDMI inputs RS232 SPK Out To Front Controls Main PWB Layout and Identification Main PWB 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 P1002 Pin 1 LD501 Pin 19 S In IC503 IC302 IC203 IC204 IC201 IC805 IC504 RF ...

Page 102: ...ion 42PQ30 Main PWB Back Side Regulator Checks Main PWB Back Side Regulator Checks 1 0V 2 3 3V 3 5V IC305 IC502 1 0 6V 2 1 8V 3 3 3V IC304 1 0 2V 2 1 2V 3 3 2V IC201 1 2 3 4V 3 0V 4 3 4V 5 6 7 8 0V IC201 IC506 1 3 8V 2 5V 3 8V ...

Page 103: ...103 Preliminary Information 42PQ30 Main PWB Regulator Checks Main PWB Regulator Checks ...

Page 104: ...f Pins Exposed Main PWB Tuner Check Shield Off Pins Exposed Video Pin 19 Video Test Point SIF Pin 16 Audio Test Point Pin 4 Tuner B 5V MAIN PWB Tuner Location 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 TU1001 ...

Page 105: ...F Output Check Tuner Location 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 106: ... MAIN PWB Main PWB Crystal X1 and X501 Check Main PWB Crystal X1 and X501 Check Crystal Location X1 1 5V DC 2 4V p p 12Mhz X501 1 5V DC 110mV p p 25Mhz Runs all the time Runs only at first turn on when LD501 is illuminated LD501 X1 X501 ...

Page 107: ...0 MAIN PWB Main PWB P1002 LVDS Video Signal Check Main PWB P1002 LVDS Video Signal Check P1002 Location Pin 11 10uSec per Div Pin 18 10uSec per Div USING GRAY SCALE SIGNAL INPUT 700mVp p Pin 1 Pin 11 2uSec per Div Pin 18 2uSec per Div ...

Page 108: ...1 22V 0V 17 0 77V 1 27V 0V 15 0 85V 1 25V 0V 13 0 85V 1 25V 0V 11 2 49V 3 29V 0V 9 Gnd Gnd Gnd 7 Gnd Gnd Gnd 5 2 49V 3 29V 0V 3 Open 0V 0V 1 Diode Mode Run SBY Pin P1002 CONNECTOR Main Odd Pins to P121 Control PWB Gnd Gnd Gnd 26 1 3V 3 29V 0V 24 0 77V 1 18V 0V 22 0 85V 1 21V 0V 20 0 81V 1 25V 0V 18 0 91V 1 21V 0V 16 0 85V 1 21V 0V 14 0 77V 1 21V 0V 12 2 44V 3 29V 0V 10 Gnd Gnd Gnd 8 Gnd Gnd Gnd 6 ...

Page 109: ...NNECTOR MAIN PWB to Front Keys 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 3 22V 0V 3 3V 13 Open 03 25 0V 14 Gnd Gnd Gnd 15 1 1V 5 13V 0V 11 1 06V 5V 5V 10 Gnd Gnd Gnd 9 2 49V 3 28V 0V 8 2 49V 3 28V 0V 7 Gnd Gnd Gnd 6 Open 0V 0V 5V 5 1 85V 3 29V 3 29V 4 1 85V 3 29V 3 29V 3 Gnd Gnd Gnd 2 3 17V 5V 5V 1 Diode Mode Run STBY Pin Pin 5 Power Key Th...

Page 110: ...2 98V 5V 15V 5V Det 17 Gnd Gnd Gnd Gnd 15 Gnd Gnd Gnd Gnd 13 1 1V 5V 5V 5V 11 1 1V 5V 5V 5V 9 Gnd Gnd Gnd Gnd 7 Open 12V 0V 12V 5 Gnd Gnd Gnd Gnd 3 Open 17 3V 0V 17V 1 Diode Mode Run STBY Label Pin P301 Pin c front Gnd Gnd Gnd Auto Gnd 22 Open 0V 0V Key On 24 Open 3 2V 0V VS On 20 Open 5V 5V AC Det 18 Gnd Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd 14 1 1V 5V 5V 5V 12 1 1V 5V 5V 5V 10 Gnd Gnd Gnd Gnd 8 Open 12...

Page 111: ...005 Voltages and Resistance Main PWB Speaker Plug P1005 Voltages and Resistance P1005 Speaker Connector Resistance Readings with the PWB 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 PWB Board Location P1005 CONNECTOR Main to Speakers ...

Page 112: ...g the connector P101 Then remove the 2 screws from the Front IR and Power LED PWB Remove J1connector Ft Control PWB and Power LED Ft Control PWB and Power LED IR IR PWB Removal PWB Removal NEW Master Power Switch Set will not function With this Mechanical switch down in the open position FRONT KEY PWB FRONT KEY PWB folded back FRONT IR and POWER LED PWB J2 J1 P101 Screw Screw Screws ...

Page 113: ...B includes the IR Receiver and the Intelligent Sensor The Front POWER LED is also located on this board Ft Power LED Ft Power LED IR IR PWB Layout PWB Layout Back View Front View IR Sensor INTELLIGENT Sensor FRONT POWER LED J2 J1 To Main PWB To Front Keys ...

Page 114: ...N PWB to Front Keys 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 3 22V 0V 3 3V 13 Open 03 25 0V 14 1V Gnd Gnd 15 1 1V 5 13V 0V 11 1 06V 5V 5V 10 Gnd Gnd Gnd 9 2 5V 3 28V 0V 8 2 5V 3 28V 0V 7 Gnd Gnd Gnd 6 Open 0V 0V 5V 5 1 6V 3 29V 3 29V 4 1 6V 3 29V 3 29V 3 Gnd Gnd Gnd 2 3 2V 5V 5V 1 Diode Mode Run STBY Pin Pin 5 Power Key This pin is 0V when...

Page 115: ...ted DVM in Diode Mode Front LED PWB Plug J2 to Key PWB Voltages and Resistance Front LED PWB Plug J2 to Key PWB Voltages and Resistance Gnd Gnd 3 29V 3 29V STBY2 J2 CONNECTOR Ft LED PWB to Ft Keys Gnd Gnd Gnd 4 Gnd 0V 4 38V 3 Open 3 29V 0V 2 Open 3 29V 0V 1 Diode Mode Run STBY1 Pin J2 Pin c STBY2 Main Power Switch IN STBY1 Main Power Switch OUT ...

Page 116: ...ey PWB contains the Master Power Switch Volume Up Down and Channel Up Down keys Also the Menu and Select keys Front Key PWB Layout Front Key PWB Layout Back View Front View Rear View Main Power Switch P101 To Front LED PWB Front View Pin c Pin c ...

Page 117: ... in Diode Mode Front LED PWB Plug P101 to Ft LED PWB Voltages and Resistance Front LED PWB Plug P101 to Ft LED PWB Voltages and Resistance Gnd Gnd 3 29V 3 29V STBY2 Gnd Gnd Gnd 4 Open Gnd 4 38V 3 Open 3 29V 0V 2 Open 3 29V 0V 1 Diode Mode Run STBY1 Pin P101 CONNECTOR Ft Key PWB to Ft LED P101 Pin c STBY2 Main Power Switch IN STBY1 Main Power Switch OUT ...

Page 118: ... all connectors Disconnected DVM in Diode Mode Invisible Speakers Section Invisible Speakers 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 ...

Page 119: ...dout Section 11 X 17 Foldout Section This section shows the 11X17 foldout that This section shows the 11X17 foldout that s available in the Paper s available in the Paper and Adobe version of the Training Manual and Adobe version of the Training Manual ...

Page 120: ...This page intentionally left blank ...

Page 121: ...IC211 Pin 3 0V Pin 2 3 3V Pin 1 4 95V P101 LVDS Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Stby5V 5V 5V 5V Key On 0V 0V 5V 23 24 Auto Gnd M5 On Vs 1 2 Va 6 7 M5 9 10 FPC FPC 15V and 5V Ribbon Cable FPC FPC FPC FPC FPC FPC Z SUS Signal 5V Varible according to Panel Label Pin Label STBY Run 1 Gnd Gnd Gnd 2 Gnd Gnd Gnd 3 4 5 6 0V 60V P202 Gnd Gnd Gnd nc nc nc 7 0V Va 0V 60V 60V Va V...

Page 122: ...1 3 5 7 9 11 13 15 17 19 21 2 4 6 8 10 12 14 16 18 20 22 Connector P1002 Configuration indicates signal pins 23 25 24 26 ...

Page 123: ...This page intentionally left blank ...

Page 124: ...123 Preliminary Information 42PQ20 This concludes the Presentation Thank You End of Presentation End of Presentation ...

Search results

Summary of Contents for 42PQ30 Series

Reviews:

Brands by name

Popular brands

LG 42PQ30 Series, Training Manual

Search results

Summary of Contents for 42PQ30 Series

Reviews:

Brands by name

Popular brands