LG 37LT760H (CHASSIS:LD2FF) Service Manual ▷ View online
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TROUBLESHOOTING GUIDE
1. Power-Up Boot Fail Trouble Shooting guide
2. No OSD Trouble Shooting guide
Check P2401 All
Voltage Level (3.5V, 12V, 24V).
Check P2401 All
Voltage Level (3.5V, 12V, 24V).
Check Q2407 output
Voltage(12V).
Check IC8700 RESET pin.
Check LVDS Cable.
Check X8701 Clock
10MHz.
Check IC8700 IIC
Communication status.
Check IR input state of IC8700
13pin.
Re-download NEC Micom
Check LCD Module
Control board
Check power connector and
RL_ON signal OK?
Check power connector and
RL_ON signal OK?
Check Q2407 application circuit
Or replace Q2407.
Check switch SW8700.
Replace Cable.
Check X8701 application circuit
or Replace X8701.
Check IIC line or replace
IC8700.
Check IR board.
Replace Power Board.
Replace Power Board.
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N
N
N
N
N
N
N
Y
Y
Y
Y
Y
Y
Y
Y
N
N
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3. Analog RF Video Trouble Shooting guide
Check RF cable & signal.
Check tuner 3.3V power L6502.
Check tuner 5V power R6513.
Check MTK LVDS output.
Check TU6500 Pin8.
(Video output)
Check tuner 1.8V power IC6501
2pin : 1.8V
Replace L6502
Check IC2404.
Replace IC105.
Replace Tuner..
Replace IC6501.
Replace IC2404.
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N
N
N
N
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Y
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N
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4. Digital RF Trouble Shooting guide
Check RF cable & signal.
Check DIF Signal
TU6500 Pin#10,11.
Check IIC Signal
TU6500 Pin#3,4.
Replace IC105.
Check tuner 5V power R6513.
Check X100 and application
circuit.
Replace TU6500.
Replace TU6500.
Check tuner 5V power R6513.
Replace IC2404.
Replace X100.
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N
N
N
N
Y
Y
Y
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Y
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5. AV Video Trouble Shooting guide
Check input signal format.
Is it supported?
Check the input of MTK(IC105).
Measure waveform at C616 because it’s more easy to check.
Can you see the normal waveform?
Check JK4600
Can you see the normal
waveform?
Check AC cable for damage
For damage or open conductor.
This board has big problem because Main chip (MTK) have some troubles.
After checking thoroughly all path once again, You should decide to replace MTK or not.
Replace JK4600.
N
Y
Y
Y
Y
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