LG 55LH5750 Service Manual Download Page 14

Page: 14 / 18

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LGE Internal Use Only

Only for training and service purposes

Check RF cable & signal

Check Tuner power

L6504: 3.3V

Replace L6504

Check Tuner I2C

R651, R652, R115, R116

Replace R651, R652, R115, R116

Follow procedure

“9. All source audio”

Check IF signal

TU3700 6,7pin

Replace Tuner

or IC101

or Main Board

9. Digital / Analog TV No sound

10. AV No sound

Check AV cable

Check audio signal

L : VA3411,R3418,C3405

R3423,R3425

R : VA3410,R3417,C3404

R3422,R3424

Replace audio signal component

L : VA3411,R3418,C3405

R3423,R3425

R : VA3410,R3417,C3404

R3422,R3424

Check Jack Audio signal

L : R3417

R : R3418

Replace Jack JK3401

Follow procedure

“9. All source audio”

Check Component cable

Check audio signal

L : VA3411,R3418,C3405

R3423,R3425

R : VA3410,R3417,C3404

R3422,R3424

Replace audio signal component

L : VA3411,R3418,C3405

R3423,R3425

R : VA3410,R3417,C3404

R3422,R3424

Check Jack Audio signal

L : R3417

R : R3418

Replace Jack JK3401

Follow procedure

“9. All source audio”

11. Component No sound

Summary of Contents for 55LH5750

Page 1: ...L69442204 1610 REV01 CHASSIS LA66L MODEL 55LH575A 55LH575A UE MODEL 55LH5750 55LH5750 UB LED TV SERVICE MANUAL Internal Use Only CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

Page 2: ...t LG Electronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 USB DOWNLOAD 9 TROUBLE SHOOTING GUIDE 10 BLOCK DIAGRAM 16 EXPLODED VIEW 17 ...

Page 3: ...o 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 metallic par...

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: ...operated for about 20 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 4 General Specification No Item Specification Result Remark 1 Receiving System ATSC NTSC M 64 256 QAM 2 Available Channel VHF 02 13 UHF 14 69 DTV 02 69 CATV 01 135 CADTV 01 135 3 Input Voltage AC ...

Page 7: ...80I 3 720 480 31 500 60 000 27 027 SDTV 480P 4 720 480 31 470 59 940 27 000 SDTV 480P 5 1280 720 45 000 60 000 74 250 HDTV 720P 6 1280 720 44 960 59 940 74 176 HDTV 720P 7 1920 1080 33 750 60 000 74 250 HDTV 1080I 8 1920 1080 33 720 59 940 74 176 HDTV 1080I 9 1920 1080 67 500 60 000 148 500 HDTV 1080P 10 1920 1080 67 432 59 940 148 352 HDTV 1080P 11 1920 1080 27 000 24 000 74 250 HDTV 1080P 12 192...

Page 8: ...8 5 WUXGA Reduced Blanking FHD only DTV 1 640 480 31 46 59 94 25 125 SDTV 480P 2 640 480 31 5 60 00 25 125 SDTV 480P 3 720 480 15 73 59 94 13 500 SDTV 480I Spec out but display 4 720 480 15 75 60 00 13 514 SDTV 480I Spec out but display 5 720 480 31 47 59 94 27 00 SDTV 480P 6 720 480 31 5 60 27 027 SDTV 480P 7 1280 720 44 96 59 94 74 176 HDTV 720P 8 1280 720 45 60 00 74 25 HDTV 720P 9 1920 1080 33...

Page 9: ...s from memory 4 Updating is staring 5 Updating Completed The TV will restart automatically 6 If your TV is turned on check your updated version and Tool option If downloading version is more high than your TV have TV can lost all channel data In this case you have to channel recover If all channel data is cleared you didn t have a DTV ATV test on production line After downloading TOOL OPTION setti...

Page 10: ...tware Main NG Replace IC101 or Main Board Check multi voltage 13V_A P2300 7 8 NG Check Power connector 12PIN NG Short check multi voltage 13V NG Replace Power board OK High Check Main IC power block IC2302 1 5V Q2303 3 3V IC2301 1 1V Replace IC404 Q406 IC403 OK Check Audio Speaker out Audio NG Previous page Main IC block Audio OK LVDS output signal NG OK Replace IC101 or Main Board LVDS power volt...

Page 11: ...R115 R116 Replace IC101 or Main Board OK Check IF signal TU6703 6 7 pin NG Replace Tuner OK NG Replace Tuner or IC101 or Main Board NG 3 Digital Analog TV Video No signal 4 AV Video No signal Check input signal format Is it supported OK Check AV cable OK Check AV Jack CVBS signal R3407 Replace AV Jack JK3401 Replace IC101 or Main Board OK Check CVBS signal VA3415 R3421 C3411 R3407 R340 C321 NG Rep...

Page 12: ...onent Video No signal Check input signal format Is it supported OK Check HDMI cable OK Check DDC in start menu NG Replace DDC component HDMI1 AR3208 AR3207 D3200 HDMI2 AR3234 AR3231 D3203 OK NG Replace Main Board or HDMI Jack HDMI1 JK3201 HDMI2 JK3202 Check DDC component HDMI1 AR3208 AR3207 D3200 HDMI2 AR3234 AR3231 D3203 NG Check TMDS signal HDMI1 JK3201 HDMI2 JK3202 1 3 4 6 7 9 10 12 pin NG Repl...

Page 13: ...Select TV Speaker Check AMP IC IC5600 Power L5600 24V L5601 3 3V NG Replace AMP power component L5600 13V L5601 3 3V OK NG Check Power connector 12PIN Replace Power board NG Check AMP I2C AR5601 AR7201 C5602 C5604 NG Replace AMP I2C component AR5601 AR7201 C5602 C5604 NG Replace AMP IC IC5600 or Main IC IC101 or Main Board OK Check I2S signal IC5600 7 8 38 pin NG Replace Main IC IC101 or Main Boar...

Page 14: ...V cable OK Check audio signal L VA3411 R3418 C3405 R3423 R3425 R VA3410 R3417 C3404 R3422 R3424 NG Replace audio signal component L VA3411 R3418 C3405 R3423 R3425 R VA3410 R3417 C3404 R3422 R3424 OK Check Jack Audio signal L R3417 R R3418 Replace Jack JK3401 NG Follow procedure 9 All source audio OK Check Component cable OK Check audio signal L VA3411 R3418 C3405 R3423 R3425 R VA3410 R3417 C3404 R...

Page 15: ...k DDC in start menu NG Replace DDC component HDMI1 AR3208 AR3207 D3200 HDMI2 AR3234 AR3231 D3203 OK NG Replace Main Board or HDMI Jack HDMI1 JK3201 HDMI2 JK3202 Check DDC component HDMI1 AR3208 AR3207 D3200 HDMI2 AR3234 AR3231 D3203 NG Check HDMI pattern JK3201 JK2301 IC101 HDMI pattern NG Replace Main Board OK Replace Main IC IC101 or Main Board 12 HDMI No sound ...

Page 16: ...MP Digital Demod IF Sub Micom R5F100GEAFB IR KEY IR KEY I2C HDMI MUX LVDS USB SPDIF OUT ETHERNET USB1 OCP 1 5A HDMI1 ARC REAR OPTIC LAN 51P DDR3 1866 2Gb x16 X_TAL 24MHz WIFI SUB ASSY USB_WIFI Tuner DDR3 1866 2Gb x16 HDMI2 SIDE CVBS YPbPr AV COMP REAR EEPROM 256Kb eMMC 5 0 4GB I2S I2C I2C I2C Analog Demod HD Model 30P RS 232 RS 232 RS 232 US Only ...

Page 17: ...fety related characteristics These parts are identified by in the 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 A2 900 200 400 800 540 521 530 820 350 121 120 LV1 A10 700 200T ...

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