LG 32LX770M Service Manual Download Page 21 | Manualshive

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LGE Internal Use Only

Copyright ©

LG Electronics. Inc. All rights reserved.

Only for training and service purposes

4. Digital RF Trouble shooting guide

Check RF Cable

Check IIC Signal

TU8900 #4, 12Pin

Check IIC line and level shifter circuit

Y

N

Check tuner 5V power L8906

Check L8906

Y

N

Y

Check X101

and application circuit

Check IF Signal

TU8900 #6, 8, 16 Pin

Check tuner application circuit or

replace tuner.

N

Y

Replace X101

N

Y

Replace IC101

Replace IC2304

N

Y

Replace L8906

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Summary of Contents for 32LX770M

Page 1: ...inted in Korea P NO MFL69373706 1512 REV00 CHASSIS LA5GI MODEL 32LX770M 32LX770M UA CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED TV SERVICE MANUAL Internal Use Only ...

Page 2: ...Electronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 8 TROUBLE SHOOTING GUIDE 19 BLOCK DIAGRAM 25 EXPLODED VIEW 26 ...

Page 3: ...inals etc to be sure the set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed m...

Page 4: ...lectrostatic charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent poten tial shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent...

Page 5: ...he solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replace...

Page 6: ... number in accordance with BOM 5 The receiver must be operated for about 5 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety UL CSA IEC specification EMC FCC ICES IEC specification Wireless WirelessHD Specification Option No Item Specification Result Remark 1 Receiving System ATSC NTSC M 64 256 QAM 2 Available Channel 1 VH...

Page 7: ...8 00 VESA SXGA X 8 1360 768 47 71 60 01 85 50 VESA WXGA O 9 1920 1080 67 50 60 00 148 5 HDTV 1080P O DTV 1 640 480p 31 46 59 94 25 17 SDTV 480P 2 640 480p 31 50 60 00 25 20 SDTV 480P 3 720 480p 31 47 59 94 27 00 SDTV 480P 4 720 480p 31 50 60 00 27 02 SDTV 480P 5 1280 720p 44 96 59 94 74 17 HDTV 720P 6 1280 720p 45 00 60 00 74 25 HDTV 720P 7 1920 1080i 33 72 59 94 74 17 HDTV 1080I 8 1920 1080i 33 7...

Page 8: ... level area 3 Adjustment items 3 1 Main PCBA Adjustments 1 ADC adjustment Component 480i 1080p 2 EDID downloads for HDMI Remark Above adjustment items can be also performed in Final Assembly if needed Adjustment items in both PCBA and final assembly stages can be checked by using the INSTART Menu 1 ADJUST CHECK 3 2 Final assembly adjustment White Balance adjustment RS 232C functionality check Fact...

Page 9: ...15200 bps Connect RS 232C Signal to USB Cable to USB Write Serial number by use USB port Must check the serial number at Instart menu 4 5 2 Method notice 1 Serial number D L is using of scan equipment 2 Setting of scan equipment operated by Manufacturing Technology Group 3 Serial number D L must be conformed when it is produced in production line because serial number D L is mandatory by D book 4 ...

Page 10: ...xvYCC off For Direct TV HDMI EDID 2D_8bit_PCM US _xvYCC off Reference HDMI1 HDMI3 In the data of EDID bellows may be different by S W or Input mode ⓐ Product ID HEX EDID Table DDC Function 0001 0100 Analog 0001 0100 Digital ⓑ Serial No Controlled on production line ⓒ Month Year Controlled on production line ex Monthly 01 01 Year 2015 19 ⓓ Model Name Hex LGTV Chassis MODEL NAME HEX LA5GG I J 00 00 ...

Page 11: ...f For Direct TV HDMI EDID 2D_10bit_PCM US _xvYCC off Reference HDMI1 HDMI3 In the data of EDID bellows may be different by S W or Input mode ⓐ Product ID HEX EDID Table DDC Function 0001 0100 Analog 0001 0100 Digital ⓑ Serial No Controlled on production line ⓒ Month Year Controlled on production line ex Monthly 01 01 Year 2015 19 ⓓ Model Name Hex LGTV Chassis MODEL NAME HEX LA5GG I J 00 00 00 FC 0...

Page 12: ...2C protocol is needed 3 Adjust Remocon 4 Video Signal Generator MSPG 925F 720p 204 Gray Model 217 Pattern 49 Color Analyzer Matrix should be calibrated using CS 1000 5 1 3 Equipment connection 5 1 4 Adjustment Command Protocol 1 RS 232C Command used during auto adj RS 232C COMMAND Explanation CMD DATA ID Wb 00 00 Begin White Balance adj Wb 00 ff End White Balance adj internal pattern disappears 2 ...

Page 13: ...rm 0 313 0 329 6 500K 0 0000 Standard color coordinate and temperature using CA 210 CH 14 by aging time 1 Normal line From January to February LGD Aging time Min Cool Medium Warm X Y X Y X Y 271 270 286 289 313 329 1 0 2 286 295 301 314 328 354 2 3 5 284 290 299 309 326 349 3 6 9 282 287 297 306 324 346 4 10 19 279 283 294 302 321 342 5 20 35 276 278 291 297 318 337 6 36 49 274 275 289 294 316 334...

Page 14: ...Wheel key of RCU 3 Stop paring with TV set by pressing Back Home key of RCU 5 3 3 Applied models Model Name Magic RF receiver 40LX770H UA Built in 43LX770H UA 49LX770H UA 55LX770H UA 65LX770H UA 32LX770M UA 43LX770M UA 55LX770M UA 5 4 Wi Fi MAC Address Check 5 4 1 Using RS232 Command Command Set ACK Transmission A l Set ID 20 Cr O K x or N G 5 4 2 Check the menu on in start 5 4 Wi Fi Test Step 1 T...

Page 15: ...Check the Sound from the Speaker or using AV Optic TEST program It s connected to MSHG 600 Remark Inspect in Power Only Mode and check SW version in a master equipment 6 Check Commercial features 6 1 External SPK Out 6 1 1 Equipment Condition Jig Speaker out JIG or Oscilloscope Power only mode 6 1 2 Check the speaker out 1 Connect the External Speaker check the sound Connect oscilloscope you can s...

Page 16: ...RJP Pin check finished or you check other function must remove the RJP cable from TV 6 3 Pro Idiom Check 1 Connect the RF Cable 2 Turn to the Pro Idiom channel No 96 1 3 Check the video sound Only displayed at POWER ONLY mode 6 4 b LAN Main board Check Press the Still key of Adjust Remocon for checking MPI port in Power Only Mode Display b LAN On message 6 4 1 Overview It is LNET RF modem FTG card...

Page 17: ...fter final inspection press In Stop key of the Adj R C and check that the unit goes to Stand by mode 7 AUDIO output check 7 1 Audio input condition 1 RF input Mono 1KHz sine wave signal 100 Modulation 2 CVBS Component 1KHz sine wave signal 0 4Vrms 7 2 Specification 8 GND and HI POT Test 8 1 GND HI POT auto check preparation 1 Check the POWER CABLE and SIGNAL CABE insertion condition 8 2 GND HI POT...

Page 18: ...number 11 Optional adjustments 11 1 Manual White balance Adjustment 11 1 1 Adj condition and cautionary items 1 Lighting condition in surrounding area surrounding lighting should be lower 10 lux Try to isolate adj area into dark surrounding 2 Probe location Color Analyzer CA 210 probe should be within 10cm and perpendicular of the module surface 80 100 3 Aging time i After Aging Start Keep the Pow...

Page 19: ... RESET and UPDATE pin Check switch SW8700 SW8701 Y N Check X8700 Clock 32 768KHz Check X8700 application circuit or Replace X8700 Y N Check IC8701 IIC communication state Check IIC line orreplace IC8701 N Check IR input state of IC8701 57pin Check IR board N Y Re download PTC Micom Y Check LVDS Cable Check LCD Module Controlboard Y Replace Cable N Check P2300 1 Voltage Level 13 2V L2303 Check powe...

Page 20: ...04 Y N Check RF cable signal Could you measure voltage of TU8900 IIC lines Are they all normal You should check power line IIC lines N Check TU8900 Pin5 Video output Can you see the normalsignal Y Check tuner 1 8V powerL8903 Check Mstar LVDS output Y Y Replace L8904 N Replace L8903 or IC8900 N Replace Main IC IC101 ormain board N You should replace TUNER Check IC2304 Replace IC2304 Replace L8906 N...

Page 21: ...shooting guide Check RF Cable Check IIC Signal TU8900 4 12Pin Check IIC line and level shifter circuit Y N Check tuner 5V powerL8906 Check L8906 Y N Y Check X101 and application circuit Check IF Signal TU8900 6 8 16 Pin Check tuner application circuit or replace tuner N Y Replace X101 N Y Replace IC101 Replace IC2304 N Y Replace L8906 ...

Page 22: ...y to check Can you see the normalwaveform JK3400 may have problem Replace this Jack This board hasbig problem because Main chip M14 have some troubles After checking thoroughlyall path once again You should decide to replace M14 or not Y Y N N Y Check input signal format Is it supported Check JK3200 JK3202 Can you see the normalwaveform Check AC cable for damage For damage oropen conductor This bo...

Page 23: ...5602 L5603 L5604 L5605 N Y After checking audio signalline you should decide to replace item ornot 8 AV Component Audio in Trouble shooting guide Check input signal format Is it supported Check JK3400 Can you see the normalwaveform Replace JK3400 Y N Check AC cable for damage For damage oropen conductor Y Y Check the input of M14 IC101 Measure waveform at C3403 because it s more easy to check Can ...

Page 24: ... again You should decide to replace M14 or not 10 Audio out Trouble shooting guide Check the output of Main IC IC101 Measure waveform at IC5600 Pin7 8 10 11 14 because it s more easy to check Can you see the normal signal Check the speakeroutput wafer P5600 Can you see the normalwaveform After checking audio signalline you should decide to replace item or not Y Check Audio AMP output L5502 L5503 L...

Page 25: ... OUT Service CPU Upgrade MICOM Internal Demod Pillow SPK IR Key Tx Rx UART S W Service Only MICOM Upgrade Tx Rx AV COMPONENT Audio L R AV COMPON ENT Magic WOL Magic WOL g Realtek WOL To MICOM USB USB2 Wi Fi Combo Side USB1 SPDIF Speaker Audio AMP EMMC 4GB HDCP CVBS I2C TS_MUX CVBS DIF SIF SPDIF IC101 M14 RF b LAN Demod IF Data_TS MPI SPI Game Control MPI TV LINK CFG MICOM EEPROM X 1 64Kb LVDS 32 4...

Page 26: ...lated characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE 200 400 800 540 810 521 530 820 500 502 121 120 LV1...

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