LG 32LH30 Series Training Manual Download Page 64

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LCD DV

32LH30

Spring 2009

MAIN PWB

Main PWB Tuner Video and SIF 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.

700mVp/p

Pin 1

Note: “Video Out” Signal only when
receiving an analog Channel.

Possibility of two

different tuners

Summary of Contents for 32LH30 Series

Page 1: ...32LH30 PRESENTATION 32LH30 PRESENTATION Direct View LCD ...

Page 2: ...ircuit Board Operation Troubleshooting of Switch mode Power Supply Section 1 Section 2 Contact Information Preliminary Matters Specifications LCD Overview General Troubleshooting Steps Signal Distribution Disassembly Instructions and Voltages Ft Control Board Side Keys ...

Page 3: ...hich 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 LCD 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 As...

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 powe...

Page 5: ...ice 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 6: ...3 0000 Technical Support and Part Sales 800 847 7597 USA Website GCSC aic lgservice com Customer Service Website us lgservice com LG Web Training lge webex com LG CS Academy lgcsacademy com LG Electronics Alabama Inc 201 James Record Road Huntsville AL 35813 http 136 166 4 200 Published August 2009 by LG Technical Support and Training 32LG40 32LH30 42LG60 42LG70 42LH20 42LH40 42LH50 47LG90 42PG20 ...

Page 7: ...l 4 C MOS circuits are sensitive to static electricity Use caution when dealing with these IC and circuits 5 Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit 6 Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry 1 Check the appearance of the Replacement Panel and Circuit Boards for both physica...

Page 8: ... 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 determina...

Page 9: ...LCD DV 32LH30 9 Spring 2009 This section of the manual will discuss the specifications of the 32LH30 LCD Direct View Display Panel 32LH30 Product Information 32LH30 Product Information ...

Page 10: ...I V 1 3 with Deep Color ISFccc Ready Smart Energy Saving LG SimpLink LG Core Technologies 32 inch and above Dynamic Contrast Ratio 50 000 1 Response Time 6ms Brightness 500 cd m2 Viewing Angle 178º H 178º V Life Span Typical 60 000 hr Built in Tuner ATSC NTSC Clear QAM Cabinet Color Glossy Piano Black Limited Warranty 1 Year Parts Labor ...

Page 11: ...ORMATS 480I 480P 1080I 720P 1080P Interlaced Progressive Interlaced Progressive Progressive 240 Lines 480 Lines 540 Lines 720 Lines 1080 Lines Lines Per Field FULL HD 1080p RESOLUTION Pixels 1920 H x 1080p V HD RESOLUTION 720p HD Pixels 1366 H 768 V 720P PANEL 1365 H 768 V 1080P PANEL 1920 H x 1080 V BASIC PIXEL COUNTS AND LOGOS Panel Pixels Lines of Resolution Panel Pixels Lines of Resolution ...

Page 12: ... Spring 2009 Basic Specifications LOGO Familiarization Page 1 Basic Specifications LOGO Familiarization Page 1 Full HD 1080p Resolution Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture ...

Page 13: ...LCD DV 32LH30 13 Spring 2009 TOP PORTION BOTTOM PORTION Remote Control Familiarization Remote Control Familiarization ...

Page 14: ...e Service Menu 1 Turn the Set On 2 Simultaneously Press and Hold the Menu Key on the Side Key pad and Press and Hold the Menu Key on the Remote approximately 5 seconds 3 If Customer s Menu appears continue to hold until it disappears 4 The Service Menu appears Note If a Password is required to enter the Service Menu Enter 0000 ...

Page 15: ...LCD DV 32LH30 15 Spring 2009 Rear and Side Input Jacks Rear and Side Input Jacks Main PWB Rear Input Locations Rear Input Jacks USB Port for Software Upgrades Only ...

Page 16: ...h Enter button using the remote control 6 You can see the download progress Bar 7 Do not unplug until unit has automatically restarted 8 When download is completed you will see COMPLETE 9 Your TV will be restarted automatically USB Software Download USB Software Download Shows the Currently Installed Version Shows the Software Version found on the USB Flash Drive Shows the Software file found on t...

Page 17: ...rews to remove stand for wall mount Model No Serial No Side Label 11 5 8 296mm 16 3 8 416mm 3 1 8 78 7mm 8 7 8 226mm Center 3 15 16 100mm Weight without Stand 24 3 lb Weight with Stand 27 6 lb 2 3 8 60mm 4 1 2 114mm 12 11 16 322 7mm 10 13 32 264 3mm 20 13 16 528 3mm 23 1 8 586 7mm Wattage AVG 102W STBY 1W ...

Page 18: ...an will have a better understanding of the disassembly procedures the layout of the printed circuit boards and be able to identify each board Troubleshooting This section of the manual will also discuss troubleshooting Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems DISASSEMBLY AND TROUBLESHOOTING SECTION DISASSEMBLY AND TROU...

Page 19: ...s Retaining bracket Lay the TV down on its face Remove the 6 screws around stand indicated by the arrows Notice the plastic support bar hidden behind the stand The back can now be removed Reinsert the stand and stand the unit upright for service position Put one screw into the stand to prevent it from falling out Remove ...

Page 20: ... attention to the size and type of screw as there are many different types Putting in an improper screw when reassembling may Cause damage The Stand must be removed before removing the back Removing the Back Cover Step 2 Stand has to be removed Removing the Back Cover Step 2 Stand has to be removed ...

Page 21: ...ut Circuit Board Layout POWER SUPPLY Main PWB LVDS Cable T CON Under Shield Ft IR LED Control AC Input RF Input Speaker R Rear Inputs Master Power Switch Side Key Speaker L T CON p n EAT60666401 Ballast p n EAY60713901 Backlight Connections BALLAST ...

Page 22: ...Power Power Supply PWB Supply PWB Removal Removal Disconnect P201 P203 AC In SK100 and SK101 Remove the 4 screws indicated by the arrows P201 AC In SK100 P203 Do not have to be released SK101 Press in Two tabs to release lock P201 ...

Page 23: ... Master Power Switch Location Power Supply Master Power Switch Location MASTER AC SWITCH LOCATION Bottom Left Side viewed from rear On Off If the TV won t come on be sure to check the Master Power Switch before assuming a failure has occurred ...

Page 24: ...wer Supply SMPS PWB Layout Power Supply SMPS PWB Layout Hot Ground Shock Hazard To Main P201 AC IN SK100 F100 5A 250V AC IN F501 3 15A 250V Run 380V STBY 168V From Hot Gnd L N Pin 1 Pin 2 To Ballast P203 To Master Power Switch SK101 ...

Page 25: ...TURN ON COMMANDS FROM MAIN PWB 32LH30 POWER SUPPLY TURN ON COMMANDS FROM MAIN PWB 6 6 6 Primary side fuse Stand By 90V Run 370V 4 24V Audio 12V 24V 8 Reg For Micro LVDS 12V Switch 12V 7 7 At point TV is in Stand By state Energy Star compliant Less than 1 Watt 4 Other Circuits 5V General BR1 Fixed Analog Dimming PWM DIM Digital Dimming Manipulates Backlights Other Circuits 9 Cust Menu for Backlight...

Page 26: ... Fixed Value 100 H5 R245 100 GPIO137 SBY5V MAIN PWB 5V 5V 5V 5V Gnd Gnd 12V 2 1 4 3 6 5 8 7 10 9 11 12 14 13 16 15 18 17 20 19 22 21 23 24 2 1 4 3 6 5 8 7 10 9 11 12 14 13 16 15 18 17 20 19 22 21 23 24 21 3V 24V Gnd Gnd Gnd Gnd Gnd Gnd n c n c n c n c E5 GPIO 134 L706 L704 24V C721 68uF C727 68uF L707 12V C720 0 1uF C722 47uF L701 Q701 R703 R706 R237 G5 R719 1KΩ Q702 R759 0Ω R717 3 3KΩ GPIO 136 R2...

Page 27: ...es the Stand By 5V voltage is present The Main Board sends two commands to the Power Supply Board one being PWR the other is INV ON These two voltages are used to control the power on turn on sequence First via PWR Pin 2 also known as POWER ON activates the Ballast voltage 24V and the 17 Volt and 12 Volt lines to the Main board The 2nd command is INV ON P201 pin 20 It is the Lamp Lighting Command ...

Page 28: ...ndby is not being generated the SMPS PWB is defective and must be replaced There is no need to continue with the next test b Unplug P700 on the Main PWB and P203 to the Ballast TEST 1 1 Add a 10K resistor between 5V STBY pin 7 8 9 or 10 and Pin 2 PWR Apply AC This will turn on the power supply a Check that the 24V and 12V power supplies are turned on P201 24V pins 17 and 18 12V pins 13 and 14 and ...

Page 29: ...firm 24V on pins 1 5 1 If low or missing use diode mode to check the 24V line on Ballast connector CN1 If low this indicates a shorted output FET 2 If open check the Ballast Fuse possible Open c Confirm the INV On Off line P203 Pin 10 is going to 3V REMOVE AC POWER d Check the connections to the Backlights DO NOT check these when AC is applied as they carry 1 2Kv each TEST 2 Power Supply PWB Backl...

Page 30: ...0V INV ON 20 Open 0V 0V Err Out 22 Open 3 2V 0V 2 PDIM 24 Diode Check Run STBY Label Pin P201 Even SMPS to P700 Main PWB nc nc nc nc 1 Gnd Gnd Gnd Gnd 3 Gnd Gnd Gnd Gnd 5 Open 5 14V 5 14V 5V 7 Open 5 14V 5 14V 5V 9 Gnd Gnd Gnd Gnd 11 Open 12 3V 0V 12V 13 Gnd Gnd Gnd Gnd 15 0 73V 24 8V 0V 24V 17 nc nc nc nc 19 Open 1 66V 0V 1 BR1 21 nc nc nc nc 23 Diode Check Run STBY Label Pin P201 Odd SMPS to P70...

Page 31: ...ode with all Connectors Removed Open 0V 0V Error 14 Open 3 40V 0V VBR_B 13 Open 3 45V 0V On Off 12 Open 1 67V 0V VBR_A 11 Gnd Gnd Gnd Gnd 10 Gnd Gnd Gnd Gnd 9 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd 7 Gnd Gnd Gnd Gnd 6 0 729V 24 52V 0V VBL 5 0 729V 24 52V 0V VBL 4 0 729V 24 52V 0V VBL 3 0 729V 24 52V 0V VBL 2 0 729V 24 52V 0V VBL 1 Diode Check Run STBY Label Pin P203 SMPS to CN1 Ballast ...

Page 32: ... Readings Across Pins 1 and 2 for STBY and RUN OL N 2 OL 120Vac L 1 Diode Check Run STBY Label Pin AC Voltage Readings for either pin 1 or pin 2 in STBY and RUN with one lead on Neutral of SK101 OL n a 2 OL 120Vac n a 1 Diode Check Run STBY Label Pin SK100 SMPS to AC IN SK101 SMPS to MASTER POWER SWITCH SK101 SK100 Bottom Right of SMPS Live Neutral With the Master Power Switch Closed On AC flows W...

Page 33: ...s 1 5 is delivered when the Power On command arrives at the SMPS The Backlights are turned on with the Inverter On command arrives INV ON is sent from the Main board through the SMPS to the Ballast The Backlights are manipulated by the control signal P DIM Digital Dimming CN1 pin 13 BALLAST SECTION BALLAST SECTION ...

Page 34: ...General Backlight Information To Backlights Over 1 2KV Currently number of lamps Unknown To Backlights Over 1 2KV EEFL External Electrode Fluorescent Lamp LOW COST Large number of lamps driven by a single inverter One Continuity path One Continuity path Ballast ...

Page 35: ... Spring 2009 Simple structure Low price Complicated structure Simple structure Lamp manufacturing process Lamp assembly structure Low Cost Large number of Lamp Drive by single inverter Introducing EEFL Introducing EEFL ...

Page 36: ...ong Life Time For CCFL Hg gas is consumed mainly near the internal electrode For EEFL longer life time is expected because there is no internal electrode consuming Hg gas EEFL Compared to CCFL Electrodes EEFL Compared to CCFL Electrodes ...

Page 37: ... 37 Spring 2009 Ballast PWB Assembly With Shield Layout Ballast PWB Assembly With Shield Layout CN1 To Backlight Right Side To Backlight Left Side Transformers Ballast Start Det LED LED1 F1 10A 125V p n EAY60713901 ...

Page 38: ...pring 2009 Ballast PWB Assembly Layout Ballast PWB Assembly Layout CN1 Ballast Start Det LED LED1 To Backlight Right Side To Backlight Left Side Transformers F1 10A 125V Warning Do not Run the Ballast with Shield Removed ...

Page 39: ...sformer Waveforms Ballast Transformer Waveforms T1 or T2 Pin 6 T1 or T2 Pin 1 34V p p 48kHz 22 2V p p 48kHz Transformers Primary Side Warning secondary is over 1 2Kv FET Drivers Warning Do not Run the Ballast with Shield Removed 1 6 1 6 T1 T2 ...

Page 40: ... 5 4 12 13 11 3 14 E5 Relay On R244 100Ω R759 0Ω R719 1KΩ Q702 Inverter On R703 10KΩ R237 100Ω R706 10KΩ Stby 5V Q701 G5 5V General Stby 5V 7 8 9 10 12V 24V 24V Reg 14 17 18 13 2 1 24V Reg 24V 12V Reg SMPS Controler 2 5 4 1 3 L733 R704 4 7Ω L700 R189 100Ω R185 1 2KΩ AB12 AB13 VBR A Analog Diming Manipulates the Backlight Brightness as well But this line is not used PWM DIM PWM Dimming Manipulates ...

Page 41: ...cklight Drive Signal Dimming Signal Effects Backlight Drive Signal Dimming Signal Effects PWMDIM manipulates the Burst Triangle Oscillator in the ballast drive IC ADIM also manipulates the Burst Triangle Oscillator But it is not used ...

Page 42: ...ink and Insulators Protects the Output FETs Insulator Insulator Be sure to replace All heat sink materials and insulators Cut Out Alignment Notch Alignment Notch Heat Transfer Material Shield p n EAY60713901 Do not Run the Ballast with Shield Removed Do not Run the Ballast with Shield Removed ...

Page 43: ...th all Connectors Removed Open 0V 0V Error 14 Open 3 40V 0V VBR_B 13 Open 3 45V 0V On Off 12 Open 1 67V 0V VBR_A 11 Gnd Gnd Gnd Gnd 10 Gnd Gnd Gnd Gnd 9 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd 7 Gnd Gnd Gnd Gnd 6 Open 24 52V 0V VBL 5 Open 24 52V 0V VBL 4 Open 24 52V 0V VBL 3 Open 24 52V 0V VBL 2 Open 24 52V 0V VBL 1 Diode Check Run STBY Label Pin CN1 Ballast to P203 SMPS ...

Page 44: ...ector CN1 from the Main Board Easily measured at fuse F1 2A and 125V There are two DC to DC converters that create 17V developed at the cathode of D8 3 3V developed at the cathode of D9 Protected by Fuses FL3 and FL4 The 3 3V can also be measured at the ribbon connectors delivering signals to the TFT panel CN3 pins 57 58 or 59 and CN4 pins 2 3 or 4 Also at the Regulator US2 the 1 5V can be checked...

Page 45: ... and the 1 screw from the top of the vertical brace Remove the T CON shield by sliding it left or right from under the vertical brace Note There are Chocolate Heat Transfer material pieces underneath the T CON Heat sink They dissipate heat from the UC1 and US3 ICs Be sure to return these pieces when reinstalling the Heat Sink Shield ...

Page 46: ... Drive PWB Removal Remember to reinstall the 3 screws for the Service Position if the T CON board needs to be turned on for test purposes These would already be removed when removing the shield CN4 CN3 CN1 Disconnect CN3 CN4 and CN1 See next slide for details UC1 US3 ...

Page 47: ...ip the lock up and back from the flex cable Then the flex cable can be easily removed To remove the LVDS cable CN1 Press in on the two tabs and slowly rock the cable out of the connector Shown by the arrows in Fig 3 Fig 3 CN1 LVDS UNLOCKING CN3 CN4 and CN1 UNLOCKING CN3 CN4 and CN1 The locking tab is flipped upward Press In Press In Pull Out CN3 or CN4 Locked T T CON TFT Drive PWB Removal Continue...

Page 48: ...Removed Components Identified CON TFT Drive PWB Shield Removed Components Identified F1 CN4 CN3 CN1 UC1 To Main PWB To TFT Panel To TFT Panel Remember to replace screws for ground purposes if testing the PWB D9 T CON p n EAT60666401 D8 US2 FL3 FL4 FL1 FL2 US3 ...

Page 49: ... Checks T CON PWB Locations 1 5V 3 3V Gnd US2 Check the Regulator US2 for Correct Voltage Check Fuse F1 for 12V from CN1 Pins 48 49 50 and 51 F1 CN1 Cathode 3 3V D9 D8 Cathode 17V Check 1 5V Fuses FL1 FL2 Check 3 3V Fuses FL3 FL4 Check Fuse F1 12V Black band indicates Cathode ...

Page 50: ...3V Gnd US2 Meter in Diode Mode black lead on Gnd lug F1 CN1 Cathode 0 68V 0 14V D9 D8 Cathode Open 0 61V Fuses FL1 FL2 0 35V 0 25V Fuses FL3 FL4 0 68V 0 14V Fuse F1 3 18V 0 57V Black band indicates Cathode Diode Check taken with meter in Diode Mode with all Connectors Removed Gnd Lug Gnd Lug Reading without brackets on TP Reading in brackets on TP No Good ...

Page 51: ...opment Checks CON TFT Drive PWB Panel Voltage Development Checks Diode Check taken with meter in Diode Mode with all Connectors Removed Gnd Lug 7 26V 3 24V Gnd 25 7V 15 5V 19 7V D10 D11 16 9V 3 3V D9 24 3V 3 3V 12V LVDS Gnd 12V LVDS 12V LVDS 7 4V 7 4V 16 7V 7 4V 7 1V Gnd ...

Page 52: ...B T T CON TFT Driver Board CN3 and CN4 Panel Voltage Checks CON TFT Driver Board CN3 and CN4 Panel Voltage Checks 16 9V 3 3V 16 9V 3 3V 7 26V Pin 5 24 3V Pin 6 16 9V Pins 55 56 3 3V Pins 58 59 7 26V Pin 56 24 3V Pin 55 16 9V Pins 5 6 3 3V Pins 2 3 ...

Page 53: ...9 T T CON PWB LVDS Connector CN1 Pin Identification CON PWB LVDS Connector CN1 Pin Identification 1 51 CN1 12V for T CON PWB Not used on T CON Video Video Video Video Video Video TA Clock TB Clock 10bit TA or 10bit TB Resolution ...

Page 54: ...V Pins 5 6 3 3V Pins 2 3 5V Pin 5 24 3V Pin 6 16V Pins 55 56 3 3V Pins 58 59 63V 1 5A CN4 US2 1 0V 2 1 8V 3 3 3V UC1 D8 D9 L1 L2 3 3V F1 12V CN1 16 9V FL1 FL2 FL3 FL4 1 5V Fuses 3 3V Fuses T CON CN3 16 9V 3 3V C110 C115 3 3V 16 9V 24 3V D10 A C A 7 26V VDD 12V LVDS US3 FL7 Gnd FL8 Gnd Pins 48 51 C84 3 3V 12V LVDS R92 Pin 23 24 Pin 25 26 24V Pin 8 12V LVDS 12V Pin 37 38 54 ...

Page 55: ... 1 1V 0V TXA2 19 20 1 1V 1 2V 0V TXA1 1 1V 1 1V 0V TXA1 1 1V 1 1V 0V TXA0 1 1V 1 2V 0V TXA0 32 23 24 25 Pin 8 PWM DIM 3 15V Max 100 to 0 6V Min 0 Customer s Menu Backlight setting But is Not Used by T CON See arrow on the T CON PWB CN1 indicating pin 1 1 1V 3 24V 0V BIT SEL 27 1 1V 1 2V 0V TXB4 1 1V 1 2V 0V TXB3 29 1 1V 1 1V 0V TXB3 30 31 1 1V 1 1V 0V TXBC 32 1 1V 1 2V 0V TXBC 33 1 1V 1 1V 0V TXB2...

Page 56: ...nt Wired Remote Port 1 Component Input Y Pr Pb and Audio L R 2 HDMI Inputs back 1 HDMI Side Input RGB PC and PC Audio USB software upgrades using flash drive USB located on the Rear AV Composite 1 Rear and 1 Side Input SIF and SAP Output Signals 20 Bit LVDS 20 Pin to the T CON Board Audio output signals to the Speakers Digital Audio Output Coaxial and Optical ON OFF Controls to the SMPS turning on...

Page 57: ...wn any cables Remove the remaining 4 screws indicated by the arrows P800 P600 P1204 Flip the locking tabs upward pull the LVDS ribbon out NOTE Be sure to check on top and behind the Video Processor IC Look for a piece of Chocolate Heat Transfer Material Be sure to transfer to new PWB if present P700 ...

Page 58: ...700 To SMPS P800 P1204 X100 USB Tuner TU1001 To Front PWB Assembly P800 to T CON PWB To Speakers Look carefully on top and behind the Video Processor IC for Chocolate Heat Transfer material Be sure to transfer to new PWB if replaced For Software Upgrade via Jig SW100 Reset X1005 P600 LD1000 IC100 Microprocessor and Video Processor Q702 Q706 ...

Page 59: ...ck View Back View Voltages given on the 11X17 foldout Interconnect Diagram IC1003 IC1002 IC102 IC601 IC702 IC1201 IC500 IC501 IC1200 IC104 Q600 Q701 Q703 Q704 Q705 Q102 Q103 Q104 IC503 Q1000 Q1001 D503 D500 19 1 D1223 D501 D502 Q107 IC103 TUNER TU1001 ...

Page 60: ...V_PVSB 1 N C 2 3 2 3 3 2V 4 5 N C 6 1 2V 7 0 8V 8 Gnd IC105 HDCP EEPROM 1 2 Gnd 3 5V 5 6 0V 4 7 Gnd 6 1 2V 7 0 8V 8 5V IC101 Flash Memory 1 2 0V 3 4 0V 5 6 0V 7 8 3 2V IC1003 5V Tuner source 1 12V 2 Gnd 3 8 94V IC1002 5V Tuner 1 8 94V 2 2 37V 3 5V 4 N C 5 Gnd IC702 3 3V_ST 1 5V 2 3 3V 3 0V IC601 1 8V Amp 1 3 2V 2 1 8V 3 0V IC107 Power Det 1 Gnd 2 Reset 3V 3 3 28V IC107 IC704 3 3V_FE IC705 1 26V_VD...

Page 61: ...X1005 Check Main PWB X100 and X1005 Check X1005 Location X100 Location 2 28Vp p 12Mhz Set on or off X400 IC100 Microprocessor Crystal MAIN PWB 4 95Vp p 25Mhz X1005 Crystal for Tuner Controller IC1004 Only when set is on X100 1 62V 1 58V 1 48V 1 55V ...

Page 62: ...PWB LD1000 Function Main PWB LD1000 Function Main PWB LD1000 Location Use LD1000 as a visual aid This lets you know if the tuner internal PLL Phase Locked Loop system is locked Illuminated PLL is normal Off is abnormal tuner lock LD1000 ...

Page 63: ...LCD DV 32LH30 63 Spring 2009 Main PWB Tuner with Shield Off Pin ID Main PWB Tuner with Shield Off Pin ID 1 19 18 4 13 12 9 8 ...

Page 64: ...utput 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 700mVp p Pin 1 Note Video Out Signal only when receiving an analog Channel Possibility of two different tuners ...

Page 65: ...65 Spring 2009 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 66: ...and 35 40 Pins 35 36 carry the clock for TA and 19 20 carry the clock for TB These signals vary from each other but looking for signals like the ones shown below on any of these pins will confirm the output of video content This signal is using standard SMTE Color Bar output from a generator as the input source Pin 1 Pin 39 This is just a sample of two pins on the LVDS There are 8 pins on P801 car...

Page 67: ...5 2V 8 Gnd Gnd Gnd Gnd 6 Gnd Gnd Gnd Gnd 4 2 8V 4 99V 0V PWR ON 2 Diode Check Run STBY Label Pin Open nc nc nc 23 Open 1 65V 0V 1 BR1 21 Open nc nc nc 19 Open 24 8V 0V 24V 17 Gnd Gnd Gnd Gnd 15 Open 12 3V 0V 12V 13 Gnd Gnd Gnd Gnd 11 1 5V 5 14V 5 14V 5 2V 9 1 5V 5 14V 5 14V 5 2V 7 Gnd Gnd Gnd Gnd 5 Gnd Gnd Gnd Gnd 3 Open nc nc nc 1 Diode Check Run STBY Label Pin 1 BR1 A DIM Pin 21 Fixed and not us...

Page 68: ...9 Main PWB LVDS Connector P800 Pin Identification Main PWB LVDS Connector P800 Pin Identification 12V for T CON PWB Not used on T CON Video Video Video 10bit TA or 10bit TB Resolution Video 51 1 P800 Video Video TA Clock TB Clock ...

Page 69: ... 0V PWM DIM 1 75V 0V 0V OPC OUT 1 75V 0V 0V OPC EN 1 1V 3 24V 0V BIT SEL 25 1 1V 1 2V 0V TXA4 1 1V 1 1V 0V TXA4 40 39 1 1V 1 2V 0V TXA3 1 1V 1 1V 0V TXA3 1 1V 1 1V 0V TXA0 1 1V 1 2V 0V TXA0 38 37 36 35 1 1V 1 2V 0V TXA2 1 1V 1 1V 0V TXA2 33 32 1 1V 1 2V 0V TXA1 1 1V 1 1V 0V TXA1 1 1V 1 1V 0V TXA0 1 1V 1 2V 0V TXA0 30 1 1V 1 2V 0V TXB4 1 1V 1 2V 0V TXB3 23 1 1V 1 1V 0V TXB3 22 21 1 1V 1 1V 0V TXBC ...

Page 70: ...meter in Diode Mode with all Connectors Removed P1204 CONNECTOR MAIN PWB to P1 Front IR LED PWB Assy Open 3 29V 0V POWER On Off 12 0 76V 3 29V 3 29V 3 3V_ST 11 Gnd Gnd Gnd Gnd 10 Open 4 8V 4 8V IR 9 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd 7 1 5V 5 1V 5 1V 5V ST 6 1 1V 3 3V 3 3V Key2 5 1 4V 3 3V 3 3V Key1 4 Gnd Gnd Gnd Gnd 3 1 67V 3 3V 3 3V SDA 2 Open 3 3V 3 3V SCL 1 Diode Check Run STBY Label Pin 1 ...

Page 71: ... to Speakers Voltage and Diode Check Diode Check taken with meter in Diode Mode with all Connectors Removed SPK L SPK L SPK R SPK R LABEL 2 6V 12 4V 0V 4 2 6V 12 4V 0V 3 2 6V 12 4V 0V 2 2 6V 12 4V 0V 1 Diode Check Run SBY Pin P600 CONNECTOR Main to Speakers Use speaker out to test for defective Audio Amp IC600 1 ...

Page 72: ...for the keys is routed from the Main board through the Front IR board to the Side Key board The Front Power LEDs pulsate or appear to move This is accomplished using multiple LEDs and a driver IC U2 which communicates with the Main board via Clock and Data lines There are several Zener diodes on the board as well and since it receives STAND BY 5V STBY 5V it could make the Power Supply or the Main ...

Page 73: ... IR and Power LED Layout Front and Back Vie Front PWB Assembly IR and Power LED Layout Front and Back View w To Main PWB IR Sensor P1 P2 To Main PWB To Side Key PWB Power LEDs U2 LED driver Note STBY5V is routed to this board Possibility of a short ...

Page 74: ...nd 2V Open Open Gnd 2 8V 2 8V Diode Check 3 3V 3 3V SCL 1 3 3V 3 3V SDA 2 Gnd Gnd Gnd 3 3 3V 3 3V Key1 4 3 3V 3 3V Key2 5 5 1V 5 1V 5V ST 6 Gnd Gnd Gnd 7 Gnd Gnd Gnd 8 4 8V 4 8V IR 9 Gnd Gnd Gnd 10 3 29V 3 29V 3 3V_ST 11 3 29V 0V POWER On Off 12 Run STBY LABEL Pin P1 Connector IR LED Control PWB to MAIN PWB P404 P2 Connector IR LED Control PWB to Side Key P3000 Gnd Key2 Gnd Key1 Label Gnd Open Gnd...

Page 75: ...LCD DV 32LH30 75 Spring 2009 Side Key Assembly Side Key Assembly To Main PWB P3000 SW3008 SW3007 SW3006 SW3005 SW3004 SW3003 SW3002 SW3001 ...

Page 76: ...ms 4 8K Ohms 1 8K Ohms 270 5 Ohms Pin 1 measured from Gnd Enter Menu Input Power KEY P3000 Voltage Measurements with Key pressed CH Up CH Dn Volume Volume KEY 2 24V 1 65V 0 906V 0 179V Pin 3 measured from Gnd 2 24V 1 65V 0 906V 0 179V Pin 1 measured from Gnd Enter Menu Input Power KEY P3000 Connector Side Key to IR LED Control PWB P1 Gnd Key2 Gnd Key1 Label Gnd Open Gnd Open Diode Check Gnd Gnd 4 ...

Page 77: ...LCD DV 32LH30 77 Spring 2009 Main Power Switch Note Main Power Switch Note Pay attention to the Main Power Switch Don t forget to leave it in the On Position ON OFF ...

Page 78: ...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 79: ... Diode Test Run V STBY Pin ID Pin Diode Test Run V STBY Pin ID Ballast 48Khz input 1 2KV 1 2KV Side Key Controls Gnd Key2 Gnd Key1 Label Gnd Open Gnd Open Diode Check Gnd Gnd 4 3 3V 3 3V 3 Gnd Gnd 2 3 3V 3 3V 1 Run STBY Pin J3 J1 Front PWB Assembly Interface IR Receiver Power Button P203 SMPS to CN1 Ballast Open 0V 0V Error 14 Open 3 40V 0V VBR_B 13 Open 3 45V 0V On Off 12 Open 1 67V 0V BVR_A 11 G...

Page 80: ...32LH30 32LH30 Direct View LCD This concludes the 32LH30 training presentation ...

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