LG 32LD350 Troubleshooting Manual Download Page 49

Page: 49 / 71

Main Board Layout

VIDEO PROCESSOR

IC100 runs Hot.

This is normal.

P402

To SMPS

See next page for component identification

P802

To Panel Interface

HDMI

USB

IC100

Headphones

HDMI

RS232

Side

Composite

Inputs

Audio

Optical

Audio

TUNER

P600

To Speakers

P2401 To

Front IR

EBU60850003 32LD350 CUSDLH (The one shown)

EBU60850009 32LD350 AUSWLJR and AUSDLFR
EBR66049702 32LD350 AUSDLJR

November LCD TV 32LD350

EBR66049702 32LD350 AUSDLJR
EBU60850010 32LD350 AUSDLUR
EBU61005102 32LD350 CUSWLH and CUSWLHO

Summary of Contents for 32LD350

Page 1: ...32LD350 720P 32LD350 32LD350 Direct View LCD Direct View LCD 720P Direct View LCD Training LCD DV Troubleshooting 32 Class HD 720P LCD TV 31 5 diagonally Published November 16th 2010 Updated February23rd 201 1 ...

Page 2: ...nal Distribution Disassembly Instructions and Voltages Troubleshooting Section Board Operation Troubleshooting of Signal Distribution Disassembly Instructions and Voltages Disassembly Section Removal of Circuit Boards Switch Mode Power Supply Ballast Backlight Driver Main Board Ft Control Board Key Board Speakers November LCD TV 32LD350 2 ...

Page 3: ...oubleshooting Techniques which can save time and money sometimes can be overlooked These techniques will also be presented Thi S ti ill t th T h i i f ili ith th Di bl Id tifi ti d This Section will get the Technician familiar with the Disassembly Identification and Layout of the LCD Display Panel f S f C At the end of this Section the Technician should be able to Identify the Circuit Boards and h...

Page 4: ...lectronics 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 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...

Page 5: ...found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful g p p g 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 ...

Page 6: ...ing Manuals Schematics with Navigational Bookmarks Start Up Sequence Owner s Guides Interconnect Diagrams Dimensions Connector IDs Product Pictures and Features 32LD350 32LG40 32LH30 37LH55 42LG60 42LG70 42LH20 42LH40 42LH50 42LH90 42SL80 47LG90 47LH85 42LE5500 42LX6500 3D 47LX9500 3D 55LX6500 3D 42PG20 42PJ350 42PQ20 42PQ30 50PG20 50PJ350 50PK250 50PK750 50PS80 50PK950 50PS60 60PK750 60PK950 60PS...

Page 7: ...aking voltage and waveform checks to prevent costly short circuits from damaging the unit 5 Be cautious of lost screws and other metal objects to prevent a possible short in the 5 e cau ous o os sc e s a d o e e a objec s o p e e a poss b e s o e circuitry Checking Points to be Considered 1 Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number ac...

Page 8: ...on 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 determination of th...

Page 9: ...32LD350 PRODUCT INFORMATION SECTION 32LD350 PRODUCT INFORMATION SECTION This section of the manual will discuss the specifications of the 32LD350 November LCD TV 32LD350 9 LCD Direct View Display ...

Page 10: ... 70 000 1 Dynamic Contrast Ratio Picture Wizard II Easy Picture Calibration Smart Energy Saving gy g AV Mode Cinema Sports Game Clear Voice II ISFccc Ready ISFccc Ready 24P Real Cinema 2 HDMI 1 3 Inputs SIMPLINK C ti it SIMPLINK Connectivity Dolby Digital 5 1 Decoder Infinite Sound November LCD TV 32LD350 10 ...

Page 11: ...s such as black level color tint sharpness and backlight levels Take the guesswork out of picture adjustments with this simple to use feature It s not actually magic but it will sure seem Save Energy Save Money It reduces the television display s power consumption The default factory setting complies with the Energy Star y g that way The default factory setting complies with the Energy Star requir...

Page 12: ...HDMI High Definition Multimedia Interface is a compact audio video interface for transmitting uncompressed digital data much more to meet local lighting conditions for both day and nighttime viewing Settings are added to preset modes for easy access from your LG remote Dolby Digital AC3 the reigning standard in surround sound technology LG SimLink is a brand specific type of HDMI CEC which allows ...

Page 13: ...32LD350 Remote Control 32LD350 Remote Control TOP PORTION BOTTOM PORTION November LCD TV 32LD350 13 p n AKB72915206 ...

Page 14: ... have either Service Remote p n 105 201M or p n MKJ39170828 2 Press In Start 3 A Password screen appears 4 Enter the Password Note A Password is required to enter the Service Menu Enter 0000 Se ce e u te 0000 Note If 0000 does not work use 0413 November LCD TV 32LD350 14 MKJ39170828 105 201M ...

Page 15: ...nput Output Jacks Rear In Out Jacks Side In Out USB for Software Upgrades Music and Photos Rear In Out Jacks USB 1 HDMI 2 USB 1 Head Phones MAIN BOARD Rear and Side Input Output locations Component Inputs November LCD TV 32LD350 15 Inputs ...

Page 16: ... With TV turned on insert USB flash drive 4 You can see the message TV Software Upgrade See figure to right 5 Cursor left and highlight START Button and push 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 CAUTION Do not remove AC power or the USB Flash Drive Do n...

Page 17: ... Screen Accessing the Host Diagnostic Screen Page Page 1 of 2 1 of 2 1 Place Television on a digital channel 2 Bring up the Customer s Menu and highlight Options on the left 3 The Option Menu appears 5 Press the 1 Key 5 to 8 times November LCD TV 32LD350 17 See next page for more details ...

Page 18: ...ser jh jung Center Frequency 663 00 MHz PCR lock Locked Modulation mode QAM 256 Carrier lock status Locked SNR 36 dB Signal level 99 dBmV Half Page Move Page Exit CH 18 Understanding the Host Diagnostic Screen Page 2 of 2 Understanding the Host Diagnostic Screen Page 2 of 2 November 2010 32LD350 LCD DV Channel Selected Software Version Blocked or not Blocked Channel Frequency Program Clock Referen...

Page 19: ...a Pg 1 of 2 Service Menu Downloading EDID Data Pg 1 of 2 1 Press ADJ key on the 2 Scroll down to Item 8 EDID D L 3 Opening EDID D L screen Service Remote and press the Select Key appears Continue on next page November LCD TV 32LD350 19 ...

Page 20: ... Pg 2 of 2 4 Highlight Reset then press Select key Erasing begins 5 After Erasing EDID now indicates NG 6 Highlight Start then press Select key Writing begins 7 After Writing completes EDID now indicates OK Select key Writing begins EDID now indicates OK November LCD TV 32LD350 20 ...

Page 21: ...ide Label 11 3 4 298mm 15 3 4 400mm 2 7 8 73 66mm 8 1 8 205 74mm Center 3 15 16 100mm Weight without Stand 24 3 lb Weight with Stand 27 6 lb 6 5 16 160mm 11 1 8 281 78mm 10 254mm 20 508mm 22 3 16 563 88mm Wattage AVG 110W STBY 1W 32LD350 Product Dimensions 32LD350 Product Dimensions November 2010 32LD350 LCD DV ...

Page 22: ... l i i Circuit Board Identification of the 32LD350 LCD Direct View Television Upon completion of this section the Technician will have a better understanding of the disassembly procedures the layout of the printed understanding of the disassembly procedures the layout of the printed circuit boards and be able to identify each board November LCD TV 32LD350 22 ...

Page 23: ...d Pay attention to th i d t Putting in an improper screw when the size and type of screw as there are many different types reassembling may Cause damage Stand Base is Glass Handle with Care November LCD TV 32LD350 23 The Stand does not have to be removed before removing the back ...

Page 24: ...arning The Frame may Board Layout Board Layout g y have sharp edges Ballast Panel Interface Board LVDS Cable P S l M i B d Power Supply SMPS Main Board Keyboard AC Input IR LED Invisible Invisible November LCD TV 32LD350 24 IR LED Board Invisible Speaker Left Invisible Speaker Right ...

Page 25: ...u System Item 18 P201 SMPS Used in the 32LD350 EAY60868901 32LD350 AUSWLJR or AUSDLFR or AUSDLUR or AUSDLJR EAY60869101 32LD350 CUSWLH or CUSDLH or CUSWLHO Main Boards Used in the 32LD350 EBU60850009 32LD350 AUSWLJR and AUSDLFR EBR66049702 32LD350 AUSDLJR EBU60850010 32LD350 AUSDLUR EBU60850003 32LD350 CUSDLH EBU61005102 32LD350 CUSWLH and CUSWLHO Panel Interface Ballast P203 CN1 P802 MAIN BOARD p...

Page 26: ...nd AC In SK100 Press in gently on the two tabs to release lock Remove the 4 screws indicated SMPS Used in the 32LD350 EAY60868901 32LD350 AUSWLJR or AUSDLFR or AUSDLUR or AUSDLJR EAY60869101 32LD350 SK100 by the arrows AC In EAY60869101 32LD350 CUSWLH or CUSDLH or CUSWLHO November LCD TV 32LD350 26 ...

Page 27: ...corative N C NOTE Always check on plastic and remove the board P2401 After removing the Main there are tabs sticking through the Main board holding the Metal plate in place P600 top and behind the Large ICs And look for a piece of Chocolate Heat Transfer Material Be sure to transfer to new Board if present Main Boards Used in the 32LD350 EBU60850009 32LD350 AUSWLJR and AUSDLFR EBR66049702 32LD350 ...

Page 28: ...nect CN1 Use caution do not allow screws to fall Use caution do not allow screws to fall NOTE If Servicing the Board return the screws to provide stability and grounding CN1 Lift the Board up slightly on the right side and slide the board to the right to release the board from the Backlight connectors Backlight connector November LCD TV 32LD350 28 ...

Page 29: ...pay attention to the Cushions behind the attention to the Cushions behind the Inverter Make sure to return them to there correct positions if they should fall or pull off with the board Connectors to the Backlights The Inverter board slides into these connectors Cushion pieces behind the Inverter November LCD TV 32LD350 29 ...

Page 30: ...t IR Board Removing Front IR Board p n EBR64965302 Disconnect J1 and J2 connectors Remove the 1 screw and pull the board forward J2 IR board Intelligent Sensor IR board Intelligent Sensor November LCD TV 32LD350 30 ...

Page 31: ...g g This section of the manual will discuss troubleshooting Upon completion of this section the Technician will have Upon completion of this section the Technician will have a better understanding of how to diagnosis and resolve problems November LCD TV 32LD350 31 ...

Page 32: ... time When the controller chip receives the POWER ON command 3 28V via P201 Pin 1 the primary section turns command 3 28V via P201 Pin 1 the primary section turns on The Primary fuse F501 now reads 388V P201 Connector To Main Board 12V is routed out P201 pins 17 19 and 21 and 24V is routed out P201 pins 2 3 and 4 P203 Connector To the Ballast 24V is routed out P204 pins 1 through 5 Other SMPS Used...

Page 33: ...SMPS Board Layout Power Supply SMPS Board Layout p n EAY60868901 F501 Hot Gnd Cold Gnd F501 3 15A 250V STBY 0V Run 388V From Hot Gnd Hot Ground Shock Hazard F100 5A 250V November LCD TV 32LD350 33 5A 250V AC Protect ...

Page 34: ...liant Less than 1 Watt 3 BR1 Fixed Analog Dimming Manipulates Backlights Power On 2 7 No AC Det in this model LVDS Panel Control Inv On Off Mstar Microprocessor IC100 Also Video Processor LVDS Video 12V RL_ON AC In Ft Control 24V INV On 8 IC103 Q108 32LD350 Television Start Up Sequence 32LD350 Television Start Up Sequence November 2010 32LD350 3D LCD 34 PWM DIM Digital Dimming Manipulates Backligh...

Page 35: ...1 97V 11 97V 12V 12V 12V 12V 0 59V ERR Out 4 49V 2 46V Q405 G5 3 3V Normal R419 1KΩ N C R473 0Ω 3 3V Normal R486 4 7KΩ R472 0Ω R479 0Ω R424 0Ω THREE STEP TURN ON PROCESS Stand By STBY_3 5V arrives on main Powers up MStar Micro Video Processor Reset occurs Then when a power on from the Key board or IR arrives 3 step process begins Step 1 RL_ON Turns on the SMPS 12V and 24V 12V arrives on Main Power...

Page 36: ...Use P402 Side to insert resistors TEST PROCEDURE Backlights will turn on during this test Pin 1 is the Brown Wire A Add a jumper between 3 5V STBY pin 7 8 9 or 10 and Pin 1 PWR_ON Apply AC This will turn on the power supply relays will click a Check that the 24V and 12V power supplies are turned on P201 12V pins 17 19 and 21 P201 24V pins 2 3 and 4 P203 24V pins 1 5 Backlights will turn on during ...

Page 37: ...03 pin 11 Silk Screened A DIM Goes high when the backlights are told to come on Goes 16 n c n c n c Open 17 12V 0V 11 97V Open 18 2 INV ON 0V 3 32V Open 19 12V 0V 11 97V Open g g back low when they come on If it goes high again on the 5th attempt to fire the backlights the set shuts off 4 A DIM Pin 22 To P203 pin 13 Silk Screened PWM DIM Is not used 20 3 ERROR 0V 0V Open 21 12V 0V 11 97V Open 22 4...

Page 38: ...lk Screened A DIM Goes high when the backlights are told to come on Goes back low when they come on If it goes high again on the 5th attempt to fire the backlights the set shuts off 2 INV_ON Pin 12 From P201 pin 18 Turns on the Backlights 3 A DIM Pin 13 From P201 pin 22 Silk Screened PWM DIM Is not used 4 PWM DIM Pin 14 From P201 pin 24 Silk Screened Error_Out can vary according to incoming video ...

Page 39: ...f SMPS F100 F501 F501 3 15A 250V F100 5A 250V AC IN L N N 3 15A 250V From Hot Gnd STBY 0V Run 388V SK100 L N If di th lt F501 i ht ft F100 Diode Check Red or Black Lead on Fuse Open Other Lead on Hot Ground If reading the voltage on F501 right after power off it takes a very long time to bleed down to the reading given here November LCD TV 32LD350 39 Diode Mode values taken with all Connectors Rem...

Page 40: ...2 starts the Ballast drive signals 120Hz g p g P DIM is delivered from the Main board through the SMPS to the Inverter on CN1 pin 14 The Ballast responsible for delivering approx 1 2kV to each of the 8 Cold Cathode Florescent bulbs This is accomplished by 8 step up transformers 1 for each lamp Cover On Cover Off November LCD TV 32LD350 40 ...

Page 41: ...Ballast Component and Connector Identification Ballast Component and Connector Identification Top Half Bottom Half CN1 24V Fuse November LCD TV 32LD350 41 ...

Page 42: ...E5 1 12V Reg 21 4 CN1 2 5 4 1 BALLAST 12 INV On Off 4 49V 14 13 BR1 PWM DIM 24V Reg 3 ERR 0 59V 20 11 ERR P201 P203 MAIN PWB 18 24 22 1 17 2 20 24V 2 5 4 1 12 14 13 3 11 November 2010 32LD350 LCD DV 32LD350 Main Board to Ballast Turn On Commands 32LD350 Main Board to Ballast Turn On Commands 42 Q401 Q402 3 3V_Normal 12V 24V 9 10 11 12 3 5V_ST 19 3 Error E5 22 n c 24 19V 11 97V Error Normal is Low ...

Page 43: ...4 6 7 8 9 10 configurations are the same 3 1 Pin 3 4 58V Q103 Q109 Q107 Q101 Pin 2 at 2MSec per div Pin 3 at 2MSec per div 12 74V p p 80 PWM DIM 28 92V p p 80 PWM DIM g 2 3 30V 80 PWM DIM Q109 Pin 1 Pin 2 Pin 3 24 16V 9 03V 0V Q101 15 15V 80 PWM DIM 30V p p 80 PWM DIM U1 Pi 1 0V 15 15V p p 80 PWM DIM Checking T103 T110 Pin 1 Pin 2 Pin 3 0V Gnd 24 07V November LCD TV 32LD350 43 Warning Pin 4 has 1 ...

Page 44: ...PWM DIM Global Dimming Explained P DIM Global Dimming Explained P DIM DIM PWM PWM DIM may also be called P DIM may also be called P DIM VBR DIM VBR B PDS BCM B PDS BCM VBR VBR B B November LCD TV 32LD350 44 ...

Page 45: ...heck Inverter Main Fuse F101 Check Center Right of the Board Just under CN1 Connector Inverter Main CN1 F1 Di d M d Ch k F1 Diode Mode Check Open Red Lead on Fuse 0 9V Black Lead on Fuse F101 F101 7A November LCD TV 32LD350 45 ...

Page 46: ...Backlight Drive Signal PWM Backlight Drive Signal PWM DIM Effects DIM Effects November LCD TV 32LD350 46 ...

Page 47: ... Inverter On Control 6 10 GND Gnd Gnd Gnd 1 5 24V 0V 24 19V Open 1 1 P DIM Pin 14 PWM_DIM can vary according to OSD Backlight setting and the incoming video IRE level PWM DIM is Output from the Video Processor IC100 Range 0 65V to 3 25V 2 A DIM Pin 13 Not Used 3 ERROR Pin 11 Normal low Goes high when the Backlights are told to turn on by INV_ON After backlights fire go back low Will repeat 5 times...

Page 48: ...board also develops several B sources on the board RUN 12V pins 13 and 14 24V pins 17 19 and 21 LVDS Panel_VCC 12V Not generated but switched from the 12V arriving from the SMPS AUDIO STAND BY VOLTAGES 3 3V_ST Voltage direct from SMPS GENERAL 5V_Normal From 12V from SMPS 5V_EXT 5V USB From 12V from SMPS from the 12V arriving from the SMPS AUDIO 1 8V Made from 3 3V_Normal 24V From Power Supply MSta...

Page 49: ...ace HDMI USB IC100 Headphones HDMI RS232 Side Composite Inputs PC PC Audio Optical Audio TUNER P600 To Speakers P2401 To Front IR EBU60850003 32LD350 CUSDLH The one shown EBU60850009 32LD350 AUSWLJR and AUSDLFR EBR66049702 32LD350 AUSDLJR November LCD TV 32LD350 49 EBR66049702 32LD350 AUSDLJR EBU60850010 32LD350 AUSDLUR EBU61005102 32LD350 CUSWLH and CUSWLHO ...

Page 50: ...nd Video Processor P802 P402 L406 IC1000 IC1450 Q100 X100 12MHz E B C HDMI Headphone SIDE A V 3 2 1 2 IC5001 TUNER TDVJ H001F P2401 P600 R R L L X1005 25MHz E B C E B C C A1 A2 D1100 Q1105 Q1100 IC2 IC105 L415 L423 IC405 IC403 L421 L422 IC406 IC600 L607 L606 C A1 A2 D7705 JK7700 JK1104 JK1102 JK1103 JK9800 IC1004 IC407 IC101 E B C E B C E B C Q7702 Q1104 Q1103 Main Boards Used in the 32LD350 EBU60...

Page 51: ... 2 11 92V In 2 3 26V Enable B 0V 3 3 3V B 3 0V Gnd 3 3 26V In C 2 26V 4 0V Gnd 4 0 8V 4 n c E Gnd 5 0V 5 0 84V 5 n c 6 3 3V 6 2 39V PWR On Off1 6 1 81V Out Q1103 4 EARPHONE 7 0V Gnd 7 3 35V Out 7 1 21V Pin MUTE 8 3 28V B 8 3 35V Out 8 n c B 0V C 0V IC401 5V Regulator IC406 5V_NORMAL IC1450 5V Shot Protection E Gnd g _ Pin for USB Pin Regulator Pin for USB 1 11 9V In 1 0V Gnd 1 0V Gnd Q1105 Earphon...

Page 52: ...07 E B C E B C Q406 S G D Q409 IC7702 C A1 A2 D7706 E B C E B C Q1101 Q1102 IC1100 E B C Q5004 IC1201 IC1104 D1115 IC1105 C A1 A2 E B C E B C Q2405 Q2406 IC7701 E B C Q7701 Q7703 C A1 A2 D7703 C A1 A2 D102 E B C Q600 1 2 3 2 IC601 In Gnd Out Gnd IC400 IC104 3 2 1 IC103 E B C 1 2 3 Q401 Q402 E B C Q405 1 3 2 IC408 D S G B ...

Page 53: ...5004 Tuner SIF In 3 35V IC1105 EDID Data IC7701 EDID Data 1 3 39V In Pin Sound Buffer Gnd Gnd Pin PC Pin HDMI2 2 0 89V Ctl B 0 163 Out 3 34V 1 0V Gnd 1 0V Gnd 3 3 28V Out C Gnd 2 0V Gnd 2 0V Gnd E 0 85V IC408 Power_Det 3 0V Gnd 3 0V Gnd Q405 Inverter On Off Pin 24V 12V 3 5V 4 0V Gnd 4 0V Gnd Pin Switch Q7701 HDMI 2 1 3 52V 5 4 7V 5 4 7V B 0 06V Pin Det 2 3 35V 6 4 7V 6 4 7V C 3 32V B 0 63V 2 3 35V...

Page 54: ...1005 Crystal Checks IC1004 VSB QAM Demodulator IC100 Micro Video Processor Crystal 12Mhz X100 y 25Mhz Runs all the time X1005 Runs only when set 12Mhz 3 61V p p 2 91V p p 3 64V p p the time 4 59V p p when set is on X1005 X100 MAIN Board November LCD TV 32LD350 54 ...

Page 55: ...Open 20 3 ERROR 0V 0 59V O Turns on the Backlights 3 Error_Out Pin 20 Silk Screened A DIM Goes high 3 3V when the backlights are told to come on G b k l h th li ht 20 3 ERROR 0V 0 59V Open 21 12V 0V 11 96V Open 22 4 A DIM 0 3V 4 49V Open 23 n c n c n c Open Goes back low when they light If it goes high again on the 5th attempt to fire the backlights the set shuts off 4 A DIM Pin 22 Silk Screened P...

Page 56: ...o the Panel Interface Board Location Top Right of Board P802 P802 12V_LVDS Pins 27 30 N t Th P l h dditi l b d th t t t d t k th Note The Panel has an additional board that sets on top and takes the 12V to generate the 5 usable voltages for the Panel November LCD TV 32LD350 56 ...

Page 57: ...forms represent the 10 bit Differential Pair LVDS Signal All waveforms shown are the part of the differential pair The part is exactly the same only inverted inverted All waveforms are at the same 5uSec per div rate and 100Mv per div November LCD TV 32LD350 57 ...

Page 58: ... c n c 5 Gnd Gnd Gnd 17 Gnd Gnd Gnd 18 TXA0 0 79V Gnd 19 TXA0 0 79V 1 06V 20 Gnd Gnd Gnd 5 Gnd Gnd Gnd 6 TXA3 1 14V 0 79V 7 TXA3 1 34V 0 79V 8 Gnd Gnd Gnd 20 Gnd Gnd Gnd 21 N C n c n c 22 LVDS_Sel 2 42 Open 23 Gnd Gnd Gnd 9 TXAC 1 25V 0 79V 10 TXAC 1 2V 0 79V 11 Gnd Gnd Gnd 24 Gnd Gnd Gnd 25 Gnd Gnd Gnd 26 Gnd Gnd Gnd 12 TXA2 1 16V 0 79V 13 TXA2 1 35V 0 79V 14 Gnd Gnd Gnd 15 TXA1 1 15V 0 79V 27 Pa...

Page 59: ...0V 0V Open 3 Gnd Gnd Gnd Gnd 4 KEY 1 3 4V 3 39V 1 52V 5 KEY 2 3 4V 3 39V 1 52V 6 3 5V_ST 3 41V 3 39V 0 9V 7 Gnd Gnd Gnd Gnd 8 LED_B 0V 0V 2 3V 9 2 IR 2V 1 98V O 9 2 IR 2V 1 98V Open 10 Gnd Gnd Gnd Gnd 11 3 3V_Normal 0 02V 3 3V 0 58V 12 LED R BUZZ 2 49V 0V 2 14V 12 LED_R BUZZ 2 49V 0V 2 14V 1 No Clock or Data pulses 2 IR pulses 1 6V p p November LCD TV 32LD350 59 Diode Mode values taken with all Co...

Page 60: ...r defective Audio Amp IC600 Note Normal Audio B Normal 3 35V Collector to Pin 25 IC600 Audio B 24 17V Pins 32 35 P600 CONNECTOR Main to Speakers Pin LABEL SBY Run Diode Check 1 SPK R 0V 12 95V Open Audio B 24 17V Pins 49 52 1 SPK R 0V 12 95V Open 2 SPK R 0V 12 95V Open 3 SPK L 0V 12 95V Open 4 SPK L 0V 12 95V Open Diode Mode values taken with all Connectors Removed 1 1 Circuit Location on the Main...

Page 61: ...uring run pin 9 reads 1 98V The IR pulses 1 6V p p J1 pin 9 are sent to P2401 on the Main board and on to the Microprocessor The IR pulses 1 6V p p J1 pin 9 are sent to P2401 on the Main board and on to the Microprocessor IC100 via pin C4 The Front Power LEDs are controlled by pins 8 Blue LED and 12 Red LED of J1 Th K b d i t d t th IR b d i J3 d t t J1 K 1 d K 2 li The Key board is routed to the ...

Page 62: ...Front IR Board Connections Identified Front IR Board Connections Identified p n EBR64965302 Key Board P3000 J1 To Main Board J2 IR board J2 November LCD TV 32LD350 62 IR board ...

Page 63: ... IR Board Remote Receiver Check IR board p n EBR64965302 IR Receiver Diode Check R indicates Red Lead R indicates Red Lead B indicates Black Lead IR Center Leg Ground 2 8V R Gnd R 2 34V 0 68V B Gnd B 0 65V Power LEDs November LCD TV 32LD350 63 ...

Page 64: ...3 4V 3 39V Open 2 Gnd Gnd Gnd Gnd p 3 Gnd Gnd Gnd Gnd 4 KEY 1 3 4V 3 39V Open 5 KEY 2 3 4V 3 39V Open 2 Gnd Gnd Gnd Gnd 3 KEY 2 3 4V 3 39V Open 4 Gnd Gnd Gnd Gnd 6 3 5V_ST 3 41V 3 39V Open 7 Gnd Gnd Gnd Gnd 8 LED_B 0V 0V Open 9 2 IR 2V 1 98V Open 10 Gnd Gnd Gnd Gnd 11 3 3V_Normal 0 02V 3 3V Open 12 LED R BUZZ 2 49V 0V O 12 LED_R BUZZ 2 49V 0V Open 1 No Clock or Data pluses 2 IR pulses 1 6V p p Nov...

Page 65: ...in 1 and Key 2 is pin 3 Pins 2 and 4 are ground Key 1 2 Voltage and Resistance Chart with buttons pressed Label Function Resistance Voltage Key 1 Vol 17M 1 70V Voltage and Resistance taken with AC applied to the set N B tt d R i t ey o 0 Vol 10M 1 09V Menu 5 27M 0 52V Enter 0 98M 0 10V No Button pressed Resistance is Open and Voltage is 3 4V Diode Check on Key 1 and Key 2 is Open Label Function Re...

Page 66: ...0961401 The 32LD350 contains the Invisible Speaker system The Full Range Speakers point downward so there is no front viewable speaker grill or air ports p n EAB60961401 It uses the dual split magnet style of thin profile speaker Installed November LCD TV 32LD350 66 ...

Page 67: ...sion of this Training Manual allows the viewer to The Adobe version of this Training Manual allows the viewer to g g 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 1 1 X 17 This Power Point shows a graphical representation of the 1 1 X 17 foldout page so clarity is limited fold...

Page 68: ... 3 4 1 3 4 1 3 4 1 3 4 1 3 4 1 3 4 1 3 4 T103 T104 T105 T106 T107 T108 T109 T110 U201 U2 U3 1 2 3 2 Q110 Q106 Pin 1 2 3 Gnd 9 03V 4 58V VOLTAGES Q103 Q109 Pin 1 2 3 24 16V 9 03V 0V 1 2 3 2 1 2 3 2 Q104 Q108 Pin 1 2 3 Gnd 9 03V 4 58V Q107 Q101 Pin 1 2 3 24 16V 9 03V 0V 1 2 3 2 U1 Pin 1 2 3 0V Gnd 24 07V 1 2 3 2 Put the 3 screws in on the right side for service position SW100 Microprocessor Reset MA...

Page 69: ...C Q5004 Tuner SIF Pin Generator Pin Amp Pin Data Buffer Pin HDMI4 Pin Control 2nd Driver Pin Sound Buffer 1 Gnd 1 2 14V 1 3 34V 1 0V Gnd B 0 679V B 0 163 2 0V 2 0V Gnd 2 3 48V 2 0V Gnd C 0V C Gnd 3 3 39V 3 0 02V 3 0V 3 0V Gnd E Gnd E 0 85V 4 2 19V 4 0V 4 0V Gnd IC104 EEPROM 5 2 19V 5 5 37V 5 4 69V Q409 PANEL_VCC Q7701 HDMI 2 Pin Mstar 6 4 37V 6 5 39V 6 4 69V Pin Switch Pin Det 1 0V Gnd 7 2 19V 7 5...

Page 70: ...se related to scope settings Pin 6 5uSec per div 625mV p p Pin 7 5uSec per div 561mV p p Pin 9 5uSec per div 548 5mV p p Pin 10 5uSec per div 565 1mV p p Pin 12 5uSec per div 349 9mV p p Pin 13 5uSec per div 535 6mV p p Pin 15 5uSec per div 540 7mV p p Pin 16 5uSec per div 534 1mV p p Pin 18 5uSec per div 583 9mV p p Pin 19 5uSec per div 395mV p p Clock TXAC Clock TXAC ...

Page 71: ...32LD350 Conclusion Page This concludes the 32LD350 training session Direct View LCD Direct View LCD ...

Search results

Summary of Contents for 32LD350

Reviews:

Related manuals for 32LD350

Brands by name

Popular brands

LG 32LD350, Troubleshooting Manual

Search results

Summary of Contents for 32LD350

Reviews:

Related manuals for 32LD350

Brands by name

Popular brands