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LCD DV August 2008 32LG40

19

This section of the manual
will discuss troubleshooting.

Upon completion of this section the Technician will have a
better understanding of how to diagnosis and resolve problems.

TROUBLESHOOTING SECTION

TROUBLESHOOTING SECTION

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Summary of Contents for 32LG40 Series

Page 1: ...del 32LG40 32 CLASS LCD HDTV w BUILT IN DVD PLAYER 31 5 diagonal Direct View LCD Direct View LCD With built in DVD Player With built in DVD Player TRAINING MANUAL TRAINING MANUAL Original 08 12 2008 Updated 10 13 2010 ...

Page 2: ...CON Board Ballast Board Circuit 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 ...

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 remove and replace safely 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: ...tsville AL 35813 32LG40 32LH30 37LH55 42LG60 42LG70 42LH20 42LH40 42LH50 42LH90 42SL80 47LG90 47LH85 42LE5500 47LE8500 42PG20 42PJ350 42PQ20 42PQ30 50PG20 50PJ350 50PK250 50PK750 50PS80 50PS60 60PK750 60PS11 60PS60 60PS80 LCD DV PLASMA Also available on the Plasma Page PDP Panel Alignment Handbook Schematics with Bookmarks Plasma Control Board ROM Update Jig required LG Contact Information LG Cont...

Page 7: ...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 physical da...

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 August 2008 32LG40 9 This section of the manual will discuss the specifications of the 32LG40 Thin LCD Direct View Display Panel 32LG40 Product Information 32LG40 Product Information Side View ...

Page 10: ...cifications 720p HD Resolution 12 000 1 Dynamic Contrast Ratio Side loading Progressive Scan DVD Player Super Multi Format 3x HDMI 1 3 AV Mode Cinema Sports Game Clear Voice SimpLink Connectivity Invisible Speaker System Expert Mode PC Input Swivel Stand Manual ...

Page 11: ...ixel Count to Resolution Comparisons Pixel Count to Resolution Comparisons FORMATS 480I 480P 1080I 720P 1080P Interlaced Progressive Interlaced Progressive Progressive Interlaced 2 Fields to make a Frame Progressive Each Field is a Frame Think of sync as the Panels Refresh Rate 240 Lines 480 Lines 540 Lines 720 Lines 1080 Lines NTSC SD HD HD HD Possible Frame Rates 24FPS 30FPS 60FPS 768 720P Panel...

Page 12: ...iving a wider sound field BUILT IN SIDE LOADING PROGRESSIVE SCAN DVD PLAYER Save space with the built in progressive scan DVD player Side loading player upconverts DVDs to near 720p resolution and features LG Super Multi technology which plays back almost any recordable disc based media LG SIMPLINK MULTI DEVICE CONTROL Allows for convenient control of other LG SimpLink products using the existing ...

Page 13: ...matically enhances and amplifies the sound of the human voice frequency range to provide high quality 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 perfo...

Page 14: ...LCD DV August 2008 32LG40 14 Remote Control Remote Control 1 2 3 4 5 6 7 8 9 0 VOL CH FAV MUTE P A G E LG TOP PORTION BOTTOM PORTION p n MKJ40653818 ...

Page 15: ...Side Input Jacks Rear and Side Input Jacks USB HDMI Composite A V Main Board Orientation Component Y Pr Pb Optical Audio RGB PC Audio RGB PC HDMI RS232 Service Only Remote In Audio Out Composite Current Software Release 32LG40 UA v03 12_080711_Download epk ...

Page 16: ...ssword may be required to enter the Service Menu If a password is required enter 0000 To access the 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 ...

Page 17: ...er 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 Software Upgrade Procedure Software Upgrade Procedure Shows the Currently Installed Version Shows the Software Version found on the USB Flash Drive Shows the Software file found...

Page 18: ...LCD DV August 2008 32LG40 18 32LG40 Product Measurements 32LG40 Product Measurements ...

Page 19: ...19 This section of the manual will discuss troubleshooting Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems TROUBLESHOOTING SECTION TROUBLESHOOTING SECTION ...

Page 20: ... Cover Removing the Back Cover The Stand does not need to be removed Remove the 18 screws shown by arrows Pay attention to the size and type of screw as there are many different types Putting in the improper screw when reassembling may Cause damage ...

Page 21: ...t Board Layout Circuit Board Layout Panel p n EAJ41825601 Side Inputs Side Controls LVDS Cables Speakers Speaker rattle 1 Tighten screws at bottom of cabinet 2 Tighten screws holding woofers T CON p n EAT56801301 Ballast p n EAY56797501 ...

Page 22: ...G40 22 Invisible Speaker System Layout Invisible Speaker System Layout Bottom View of Woofer Ports Woofers Tweeters Tweeters Stand Removed Speaker rattle 1 Tighten screws at bottom of cabinet 2 Tighten screws holding woofers ...

Page 23: ...f BR1 Gnd Gnd Gnd Gnd Gnd 24V 24V 24V 24V 24V 14 13 12 11 10 9 8 7 6 5 4 3 2 1 n c F101 3 15A 250V 334V Actual 1 Hot Ground n c PWR DIM INVOn Off ACD Gnd Gnd 5 2V 5 2V Gnd 12V Gnd 16 5V 24 22 20 18 16 14 12 10 8 6 4 2 Fixed Volts BR1 POWER ON ERROR Gnd Gnd 5 2V 5 2V Gnd 12V Gnd 16 5V 23 21 19 17 15 13 11 9 7 5 3 1 SMPS Board Layout SMPS Board Layout ...

Page 24: ...AC IN To Ballast 16 5V Gnd 12V Gnd 5 2V 5 2V Gnd Gnd ACD INVOn Off PWR DIM n c 2 4 6 8 10 12 14 16 18 20 22 24 16 5V Gnd 12V Gnd 5 2V 5 2V Gnd Gnd ERROR POWER ON BR1 fixedV 1 3 5 7 9 11 13 15 17 19 21 23 Error WM D1 INV On Off BR1 Gnd Gnd Gnd Gnd Gnd 24V 24V 24V 24V 24V 14 13 12 11 10 9 8 7 6 5 4 3 2 1 F101 3 15A 250V 334V Actual ...

Page 25: ...LCD DV August 2008 32LG40 25 Power Supply P201 Control Signals from Main Board P800 Power Supply P201 Control Signals from Main Board P800 ...

Page 26: ...sconnected from other Boards and AC applied confirm that the Power Supply is producing 5V from either Pins 9 10 11 or 12 If not check fuse If fuse OK and no 5V replace Power Supply If 5V OK then continue 1st short either pin 9 10 11 or 12 5V to Pin 19 PWR using a 10K resistor This turns on the power supply Confirm that the other low voltage power supplies are activated Pins 1 and 2 16V Pins 5 and ...

Page 27: ...rd should turn on first then backlights should turn on and LED1 should go off If no backlight activity confirm the Fuse F101 has approx 350V on both sides If on one side check fuse for open If no 350V replace Power Supply If 300V present check P203 for 24V on Pins 1 5 Check P203 Pin 12 for at least 3V Inverter On Off If yes confirm Connectors to backlight OK if OK then panel defective 5V P2 Connec...

Page 28: ...LCD DV August 2008 32LG40 28 Power Supply Board Removal Power Supply Board Removal Disconnect P203 P201 and AC In Remove the 4 screws indicated in the red circles ...

Page 29: ...5 15V 5 2V 9 0 34V 5 15V 5 15V 5 2V 11 Gnd Gnd Gnd Gnd 13 Gnd Gnd Gnd Gnd 15 1 26V Gnd Gnd ERR 17 OL 2 86V 0V PWR 19 OL 1 68V 0V BR1 21 OL 3 2V 0V N C 23 Diode Check Run STBY Label Pin P201 SMPS to P800 Main Board Gnd Gnd Gnd Gnd 4 0 31V 16V 0V 16 5V 2 1 69V 11 8V 0V 12V 6 0V Gnd Gnd Gnd 8 0 34V 5 15V 5 15V 5 2V 10 0 34V 5 15V 5 15V 5 2V 12 Gnd Gnd Gnd Gnd 14 Gnd Gnd Gnd Gnd 16 OL 4 57V 5 05V ACD ...

Page 30: ... Connectors Removed OL 0V 0V ERROR 14 OL 3 40V 0V PWM DIM 13 OL 3 45V 0V INV On Off 12 OL 1 67V 0V BR1 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 33V 24 52V 0V 24V 5 0 33V 24 52V 0V 24V 4 0 33V 24 52V 0V 24V 3 0 33V 24 52V 0V 24V 2 0 33V 24 52V 0V 24V 1 Diode Check Run STBY Label Pin P203 SMPS to MCN1 Ballast Board ...

Page 31: ...g IC806 A3 3V BCM IC802 3 3V Reg IC600 HDMI Selector IC800 CVBS Amp IC304 DDR VTT IC301 IC303 IC300 IC302 IC400 BCM Reset Q801 5V Sub Switch IC501 Audio Processor and Output 16V Pins 49 52 IC602 HDMI EDID IC502 Audio Selector IC402 Serial Port Interface IC201 USB 3 3V X400 24Mhz Q800 SIF IC601 HDMI EDID X200 54Mhz Dual Data Registers IC405 Micro Reset Q400 Micro Reset Q802 5V Sub Switch Control If...

Page 32: ...gulator IC803 1 29V 0V DDRO_VTT On Off Control 4 3 2V 0V 5V_SUB IN 3 2 6V 0V D2 6V_BCM IN 5 6 7 Gnd Gnd Gnd OUT 2 1 29V 0V DDRO_VTT OUT 3 8 5V 0V 3 3V Gnd 1 RUN STBY NAME FUNCTION PIN RUN STBY NAME FUNCTION PIN 2 6V BCM IC304 3 3V Regulator 3 3V TMDS_SW IC802 3 1V 0V 3 3V OUT 8 0 6V 0 6V Reset Lo Hi OUT 3 5V 0V USB_PWR_Out_1 OUT 7 Gnd Gnd Gnd Gnd 2 3 4V 0V BCM DDR Power On Off Control 3 3 41V 3 41...

Page 33: ...UNCTION PIN n c n c n c n c 4 RESET GENERATOR FOR MICRO IC407 Q400 5V 0V 5V OUT 3 Gnd Gnd Gnd Gnd E 3 4V 0V Power_CTL_3 3V On Off Control 2 5V 0V ST_5V Pull Down C 8 9V 0V 9V IN 1 3 29V 0V RL_ON On Off Control B RUN STBY NAME FUNCTION PIN RUN STBY NAME FUNCTION PIN D3 3V A3 3V_BCM Regulator IC807 CONTROLLER for 5V SUB SWITCH Q801 Q802 3 4V 0 1V D3 3V_BCM OUT 4 5V 0V 5V_SUB OUT 5 6 7 8 Gnd Gnd Gnd ...

Page 34: ...U800 P800 P901 P900 P904 P401 P500 P902 P200 IC808 3 3V Micon 1 16 IC102 HDCP KEY IC403 NVRAM IC805 A1 2V BCM Reg IC702 EEPROM Q901 LVDS 12V Switch Q900 Turns on Q901 IC406 Micro EEPROM X200 Side Inputs IC408 SIF Select DVD BCM IC701 Side HDMI EDID IC801 1 8V Reg IC401 BCM Reset Silk Screen for Pin 1 wrong IC805 ...

Page 35: ...N RUN STBY NAME FUNCTION PIN LVDS 12V SWITCH Q901 D1 2V A1 2V BCM REGULATOR IC805 0V 0V Gnd Gnd E 3 29V 0 26V 3 3V_TMDS_SW IN 3 0V 0V LVDS Switch Control Pull Down 12V C 1 8V 0V 1 8V_NTP OUT 2 0 75V 0V LVDS_PANEL_CTRL Control B Gnd Gnd Gnd Gnd 1 RUN STBY NAME FUNCTION PIN RUN STBY NAME FUNCTION PIN LVDS 12V SWITCH CONTROLLER Q901 Q900 1 8V_NTP REGULATOR IC801 Gnd Gnd Gnd Gnd 4 3 4V 0V BCM_RESET OU...

Page 36: ...0 Main Board X400 and X200 Check Main Board X400 and X200 Check Main Board X400 Location Main Board X200 Location MAIN Board 660mVp p 54Mhz Only when set is on X200 1 49V 1 49V 1 49V 1 49V TP Use Crystal Side R232 or R233 TP Use Crystal leg top or bottom IC407 Micro ...

Page 37: ...in Board Tuner Video and SIF Output Check Pin Location For Easy Access pop the shield off the tuner If you leave the shield on you can still access the same pins Be careful not to accidentally ground out your test lead on the shield Pin 16 Composite Video Pin 14 Audio SIF Pin 3 Tuner B 5V ...

Page 38: ...AIN Board Main Board Tuner Video and SIF Output Check Main Board Tuner Video and SIF Output Check Tuner Location 1Vp p 20uSec rate Pin 16 Video Signal Pin 14 SIF Signal 850mVp p Using SMTP Color Bar Input Using SMTP Color Bar Input ...

Page 39: ... LVDS cable for output Check 11 20 This signals vary from each other but looking for signals like the ones shown below on any of these pins confirm the output of video content This signal is using standard SMTE Color Bar output from a generator as the input source Pin 11 Pin 16 MAIN Board Remember there are actually 10 pins with LVDS signals This only represents two Waveforms as an example ...

Page 40: ...Software Upgrades Remove the 2 screws securing the Side input decorative plastic piece on the right Remove the 4 screws securing the Main Board indicated below in red Remove the Right side decorative plastic piece by removing top and bottom screws Remove the remaining 6 screws that remove the Shield covering the Main Board Careful at this point the Board will Swing free of the supports ...

Page 41: ... 2V 0V n c 23 2 15V 3 38V 0V VBR B 22 OL 1 68V 0V BR1 21 2 15V 3 29V 0V INV On Off 20 1 25V 2 86V 0V RL ON 19 OL 4 57V 5V AC DET 18 OL 3 3V 0V VBR B 5V MNT 17 Gnd Gnd Gnd Gnd 15 16 Gnd Gnd Gnd Gnd 13 14 1 23V 5 15V 5V ST 5V 11 12 1 23V 5 15V 5V ST 5V 9 10 Gnd Gnd Gnd Gnd 7 8 3 03V 11 8V 0V 12V 5 6 Gnd Gnd Gnd Gnd 3 4 OL 16V 0V 16V 1 2 Diode Check Run STBY Label Pin P800 Connector Main to P201 SMPS...

Page 42: ...rd Connector P902 LVDS Layout and 12V Circuit LVDS Signal Waveforms Shown on back of Interconnect Diagram Panel Control from IC407 Pin 33 Q900 turns on Q901 LVDS Switch generating LVDS 12V All voltages are shown on the Interconnect Diagram LVDS 12V For Locations See Main Board Back Side View ...

Page 43: ...6V 1 1V 0V LVDS 15 1 11V 1 2V 0V LVDS 13 0 98V 1 2V 0V LVDS 11 Gnd 0V 0V Gnd 9 Gnd 0V 0V Gnd 7 Gnd 0V 0V Gnd 5 OL 12 3V 0V LVDS 12V 3 OL 12 3V 0V LVDS 12V 1 Diode Check Run SBY Label Pin Gnd 0V 0V Gnd 26 OL n c 0V n c 24 OL n c 0V n c 22 1 06V 1 06V 0V LVDS 20 1 06V 1 13V 0V LVDS 18 1 05V 1 09V 0V LVDS 16 1 06V 1 05V 0V LVDS 14 0 98V 1 1V 0V LVDS 12 Gnd 0V 0V Gnd 10 Gnd 0V 0V Gnd 8 Gnd 0V 0V Gnd 6...

Page 44: ...rs Removed Gnd 0V 0V Gnd 15 0 8V 0V 2 1V LED R 14 0 8V 2 1V 0V LED G 13 Gnd 0V 0V Gnd 12 OL 0V 0V n c 11 2 3V 4 1V 4 1V IR 10 0 8V 0V 0V PWM LED 9 0 53V 5V 5V ST 5V 8 OL 0V 0V n c 7 1 4V 3 4V 3 4V KEY 2 6 1 4V 3 4V 3 4V KEY 1 5 Gnd 0V 0V Gnd 4 Gnd 0V 0V Gnd 3 1 4V 3 4V 3 4V KEY4 2 1 4V 3 4V 3 4V KEY3 1 Diode Check Run STBY Label Pin P401 Connector Main Board to Front Keys ...

Page 45: ...V Pr 6 Gnd Gnd 0V Gnd 5 OL 3 3V 3 34V n c 4 OL 3 3V 3 34V n c 3 1 60V 3 3V 3 3V Disc Chedk 2 OL 3 34V 3 34V n c 1 Diode Check Run SBY Label Pin OL 0V 0V n c 26 Gnd 0V 0V Gnd 25 OL 0V 0V n c 24 OL 0V 0V n c 23 Gnd 0V 0V Gnd 22 OL 0V 0V n c 21 OL 2 4V 0V DVD R In2 20 Gnd 0V 0V Gnd 19 OL 2 4V 0V DVD L In2 18 OL 0V 0V DVD MUTE 17 0 83V 1 8V 3 38V DVD SPDIF 16 OL 0V 0V n c 15 OL 0 7V 0V n c 14 Diode Ch...

Page 46: ...el Pin P900 Connector Main to P402 DVD Player 0 45V 5 01 0V 5V 6 Gnd 0V 0V Gnd 5 Gnd 0V 0V Gnd 4 099V 3 37V 3 4V DVDP 3 3V 3 Gnd 0V 0V Gnd 2 3V 12 3V 0V 12V 1 Diode Check Run SBY Label Pin P901 Connector Main to CN400 DVD Player 2 78V 8 15V 0V L 4 2 78V 8 15V 0V L 3 2 78V 8 14V 0V R 2 2 78V 8 14V 0V R 1 Diode Check Run SBY Label Pin P500 Connector Main to Speakers Gnd 0V 0V Gnd 4 OL 5V 0V SDA 3 OL...

Page 47: ...ugust 2008 32LG40 47 MCN1 To Backlight Right Side To Backlight Left Side Transformers Ballast Start Det LED LED1 F1 8A 125V p n EAY56797501 BALLAST SECTION With Shield LAYOUT BALLAST SECTION With Shield LAYOUT ...

Page 48: ...LCD DV August 2008 32LG40 48 Ballast Board Assembly Layout Ballast Board Assembly Layout MCN1 Ballast Start Det LED LED1 To Backlight Right Side To Backlight Left Side Transformers F1 8A 125V ...

Page 49: ...CD DV August 2008 32LG40 49 Ballast Transformer Waveforms Ballast Transformer Waveforms T1 T2 Pin 6 Transformers T1 T2 Pin 1 34V p p 64 89kHz 22 2V p p 220kHz Primary Side Warning secondary is over 1 2Kv ...

Page 50: ...LCD DV August 2008 32LG40 50 Ballast Control Signals from Main Board P800 Ballast Control Signals from Main Board P800 ...

Page 51: ...cklight Drive Signal Effects 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 Waveform Just for Explanation taken from a different chassis ...

Page 52: ...nsulators Ballast Removal Heat Sink and Insulators Protects the Outputs Insulator Insulator Shiny Side Down Conductive Be sure to replace All heat sink materials and insulators Cut Out Alignment Notch Alignment Notch Heat Transfer Material Shield p n EAY56797501 ...

Page 53: ... with Connectors Removed Gnd Gnd Gnd Gnd_2 14 OL 3 40V 0V VBR_B 13 OL 3 45V 0V On Off 12 OL 1 67V 0V BVR_A 11 Gnd Gnd Gnd Gnd_1 10 Gnd Gnd Gnd Gnd 9 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd Gnd 7 Gnd Gnd Gnd Gnd 6 OL 24 52V 0V VBL 5 OL 24 52V 0V VBL 4 OL 24 52V 0V VBL 3 OL 24 52V 0V VBL 2 OL 24 52V 0V VBL 1 Diode Check Run STBY Label Pin MCN1 Ballast to P203 SMPS ...

Page 54: ... CON TFT DRIVE SECTION CON TFT DRIVE SECTION CN1 LVDS To Main Remove Screw Remove Screw Remove One Screw at the to of the Brace then Remove LVDS and three screws Remove Screw T T CON TFT DRIVE Board Removal CON TFT DRIVE Board Removal ...

Page 55: ...TFT Drive Board Layout CN2 CN3 CN1 LVDS US2 To Main To TFT Panel To TFT Panel Use the Connector P902 on Main Board for Voltages and Signal Readings 3 0 0V 2 1 8V 1 3 3V US2 12V F1 6 3V 1 5A Remember to put the three screws back in for ground purposes p n EAT56801301 ...

Page 56: ...n CN2 and CN3 must be present for the panel to operate US1 Voltages 6 6V 48 3 3V 32 0V 16 0V 47 6V 31 0V 15 6 6V 46 1 8V 30 6 9V 14 6 6V 45 4 3V 29 15 0V 13 6 6V 44 V0V 28 4 8V 12 15 0V 43 12 0V 27 0V 11 15 0V 42 12 0V 26 1 2V 10 1 2V 41 12 0V 25 21 0V 9 0V 40 3 3V 24 19 70 8 15 0V 39 3 3V 23 5 4V 7 12 0V 38 11 3V 22 3 3V 6 12 0V 37 1 2V 21 1 9V 5 0V 36 0V 20 0 7V 4 0V 35 0V 19 2 4V 3 0V 34 4 3V 1...

Page 57: ...DS Removal CON Board Removal LVDS Removal Disconnect CN1 LVDS Cable CAUTION When removing LVDS Cables be careful Press the release Tabs to avoid damage to Board or to the Cable itself LVDS Connectors Press in from the sides and lift out Press in Press in ...

Page 58: ...19 0 88V 1 13V 0V LVDS 18 0 88V 1 08V 0V LVDS 17 0 88V 1 09V 0V LVDS 16 0 88V 1 1V 0V LVDS 15 0 88V 1 05V 0V LVDS 14 0 88V 1 2V 0V LVDS 13 0 88V 1 1V 0V LVDS 12 0 88V 1 2V 0V LVDS 11 Gnd 0V 0V Gnd 10 Gnd 0V 0V Gnd 9 Gnd 0V 0V Gnd 8 Gnd 0V 0V Gnd 7 Gnd 0V 0V Gnd 6 Gnd 0V 0V Gnd 5 2 9V 12 3V 0V LVDS 12V 4 2 9V 12 3V 0V LVDS 12V 3 2 9V 12 3V 0V LVDS 12V 2 2 9V 12 3V 0V LVDS 12V 1 Diode Check Run SBY ...

Page 59: ...nnector Information The following section covers the Interconnection Voltages and The following section covers the Interconnection Voltages and Resistance checks between the DVD Player and the Main Resistance checks between the DVD Player and the Main Board Board ...

Page 60: ...LCD DV August 2008 32LG40 60 DVD Player Removal 1 of 2 DVD Player Removal 1 of 2 Remove the 8 Screws Holding the DVD Player in place Remove Tape ...

Page 61: ...LCD DV August 2008 32LG40 61 DVD Player Removal 2 of 2 DVD Player Removal 2 of 2 Disconnect CN400 CN401 and CN402 This screw hidden by tape in previous photo Step2 CN402 CN403 Not Used CN401 CN400 ...

Page 62: ...LCD DV August 2008 32LG40 62 DVD Player Removed DVD Player Removed Set will work with DVD Player removed ...

Page 63: ...3 3 13V 3 4V 3 3V Check 2 3 13V 3 34V 3 34V nc 1 Diode Check Run SBY Label Pin CN401 Connector DVD to P904 Main OL 0V 0V nc 26 Gnd 0V 0V Gnd 25 OL 0V 0V nc 24 OL 0V 0V nc 23 Gnd 0V 0V Gnd 22 OL 0V 0V nc 21 1 1V 2 4V 0V DVDP R 20 Gnd 0V 0V Gnd 19 1 1V 2 4V 0V DVDP L 18 2 3V 0V 0V DVDP MUTE 17 OL 1 8V 3 38V SPDIF 16 Gnd 0V 0V nc 15 0 15V 0 7V 0V nc 14 Diode Check Run SBY Label Pin Pin 2 3 4V With Di...

Page 64: ... Removed 1 2V 5V 0V P5V 6 Gnd Gnd Gnd Gnd 5 Gnd Gnd Gnd Gnd 4 0 78V 3 37V 3 4V P3 3V 3 Gnd Gnd Gnd Gnd 2 3 22V 12 3V 0V P12V 1 Diode Check Run STBY Label Pin CN400 Connector DVD to P901 Main Gnd Gnd Gnd Gnd 4 OL 3 4V 0 7V RXD1 3 OL 3 08V 0 7V TXD1 2 OL 3 4V 3 4V GP101 1 Diode Check Run STBY Label Pin CN402 Connector DVD to P900 Main Pin 1 3 4V with No Disc and 0V with Disc inserted ...

Page 65: ...s the Interconnection Voltages The following section covers the Interconnection Voltages and Diode Mode checks between the Front Board and the and Diode Mode checks between the Front Board and the Main Board and the Front Board and the Side Key Board Main Board and the Front Board and the Side Key Board ...

Page 66: ...LCD DV August 2008 32LG40 66 Front Board Assembly Layout Front Board Assembly Layout J2 J1 To Main Board To Side Keys Board ZD3 3 4V Zener ZD1 5V Zener ZD2 4 1V Zener ...

Page 67: ...LCD DV August 2008 32LG40 67 Front Board Assembly Rear View Layout Front Board Assembly Rear View Layout POWER BUTTON IR Receiver POWER LED ...

Page 68: ...12 OL 0V 0V n c 11 OL 4 1V 4 1V IR 10 2 4V 0V 0V PWM LED 9 2 7V 5V 5V ST 5V 8 OL 0V 0V n c 7 OL 3 4V 3 4V KEY 2 6 OL 3 4V 3 4V KEY 1 5 Gnd 0V 0V Gnd 4 Gnd 0V 0V Gnd 3 OL 3 4V 3 4V KEY4 2 OL 3 4V 3 4V KEY3 1 Diode Check Run STBY Label Pin J1 Front Board to P401 Main Gnd 0V 0V Gnd 8 OL 3 41V 3 41V Key 4 7 Gnd 0V 0V Gnd 6 OL 3 41V 3 41V Key 3 5 Gnd 0V 0V Gnd 4 OL 3 41V 3 41V Key 2 3 Gnd 0V 0V Gnd 2 O...

Page 69: ...nnector Layout Voltage and Diode Check With all Connectors Removed Resistance taken in Diode Mode Gnd 0V 0V Gnd 8 OL 3 41V 3 41V Key 4 7 Gnd 0V 0V Gnd 6 OL 3 41V 3 41V Key 3 5 Gnd 0V 0V Gnd 4 OL 3 41V 3 41V Key 2 3 Gnd 0V 0V Gnd 2 OL 3 4V 3 4V Key 1 1 Diode Check Run STBY Label Pin P101 Side Control to J2 Front Board ...

Page 70: ...g Manual and Adobe version of the Training Manual The Adobe version of this Training Manual allows the viewer to The Adobe version of this Training Manual allows the viewer to zoom in and out making reading of the small text easier zoom in and out making reading of the small text easier This Power Point shows a graphical representation of the 11 X 17 This Power Point shows a graphical representati...

Page 71: ...nd Gnd Gnd 1 IN 9V 0V 8 9V C Pull Down ST_5V 0V 5V 5 6 7 IN D2 6V_BCM 0V 2 6V 3 IN 5V_SUB 0V 3 2V 2 On Off Control Power_CTL_3 3V 0V 3 4V E Gnd Gnd Gnd Gnd 4 On Off Control DDRO_VTT 0V 1 29V IC803 3 OUT 5V 0V 5V Q400 IC400 PIN FUNCTION NAME STBY RUN 4 n c n c n c n c PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN 1 IN 12V 0V 12V 5 Gnd Gnd Gnd Gnd B Reset Reset 0 6V 0 6V 1 IN D3 3V_BCM 0V 3 ...

Page 72: ...ORMS Waveforms taken using SMTP Color Bar input All readings give the Scale and Time Base related to scope settings Top waveform in each image gives a slower rate 10mV at 5uS per division Bottom waveform shows a blow up sample 10mV at 2uS per division ...

Page 73: ...32LG40 32LG40 Direct View LCD This concludes the 32LG40 training session ...

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