LG 37LD340H / 37LD345H (CHASSIS:LA06G) Service Manual ▷ View online
Power-Up Boot Fail Trouble Shooting guide
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Check power connector and
RL_ON signal OK ?
Replace Power board
Y
N
Y
Check IC1602 RESET and
UPDATE pin
Check switch SW501, SW502
Y
N
Check X1600 Clock
32.768MHz
Check X1600 application circuit
or Replace X1600
Y
N
Check IC1602 IIC communication
state
Check IIC line or replace IC1602
N
Check IR input state of IC1602
57pin
Check IR board
N
Y
Re-download PTC Micom
Y
No OSD Trouble Shooting guide
Check LVDS Cable
Check LCD Module
Control board
Y
Replace Cable
N
Check P401 All
Voltage Level (5V, 12V, 16V)
Check power connector and
RL_ON(pin1) signal OK ?
Replace Power board
N
Y
Check Q409 output Voltage(12V)
Y
Check Q409 application circuit or
replace Q409
N
Check TU5001 Pin11(Video output)
Can you see the normal signal?
Can you see the normal signal?
Check tuner 5V power L5002
YES
NO
Could you measure voltage of TU5001 & IIC lines?
Are they all normal?
Are they all normal?
Check Mstar LVDS output
NO
You should check power line
& IIC lines.
& IIC lines.
YES
You should replace TUNER.
NO
Check IC401
Analog RF Video Trouble shooting guide
YES
YES
Check tuner 3.3V power L5003
Replace L5003
NO
Replace IC401
Replace L5002
YES
NO
Check tuner 1.2V power IC5001
2pin : 1.2V
Replace IC5001
NO
Check RF cable & signal
YES
NO
Replace
Mstar(IC101) or
main board
Mstar(IC101) or
main board
Digital RF Trouble shooting guide
Check RF Cable
Check IIC Signal
TU5001 #7, 8 Pin
Check IIC line and level shifter
circuit
Y
N
Check Tuner 5V Power
IC401
Replace IC401
Y
N
Y
Check X201
and application circuit
Check IF Signal
TU5001 #10, 11 Pin
Check tuner application circuit or
replace tuner.
N
Y
Replace X201
N
Y
Replace IC101
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