LG 19LG3000 / 19LG3010 (CHASSIS:LD84A) Service Manual ▷ View online
TROUBLE SHOOTING
1. No Power (LED Blank )
No Power
Check power
cord and board
interface
NG
Plug in power cord and
interface
OK
Check F901, BD901
NG
Replace F901 or BD901
OK
Check Q901
NG
Replace Q901
OK
Check IC901
NG
Replace IC901
OK
Check T901
Replace T901
NG
OK
Replace Q903, ZD920,
IC903 IC902
IC903 IC902
CheckQ903, IC903,ZD920 IC902
and relative circuit
and relative circuit
NG
2. No Display
3. Can
’t start (LED indicator Blank)
Check the source
OK
Reset source
NG
Check LVDS cable
NG
Replace LVDS cable
OK
Check 12V power supply
NG
Return to “1”
OK
OK
Check U404
NG
Replace U404
OK
OK
Check panel
NG
Replace panel
Check main board power
Check I
2
C communication
Repair I
2
C communication relative circuit
NG
No display
NG
Repair the keyboard
OK
Check 5V_SB
NG
Check every chip power supply
OK
NG
Check I
2
C communication
OK
Check keyboard
Replace I
2
C communication component
Check oscillistor
NG
Replace oscillistor
Can’t start
4. Abnormal Display
Check the source
OK
Reset source
NG
Check signal filter circuit
NG
Replace the filter or inductance
Repair each relative circuit
RF signal
Check TV system setup
OK
Check TU201
Replace TU201
AV, S-video signal
component PC signal
component PC signal
OK
Check LVDS cable
Check input signal
OK
OK
OK
NG
Replace LVDS cable
OK
Check panel
Replace panel
NG
Abnormal display
5. No Sound
Check the source
OK
Reset source
Check signal filter circuit
NG
Replace the filter or inductance
OK
NG
SIF signal
Check TV system setup
OK
Check TU201
Replace TU201
AV, component, S-video, PC signal
NG
Check Amplifier TDA8932BTW U602
Replace U602
Check Earphone jack
NG
Replace the Earphone jack
OK
Check speaker
NG
Replace speaker
Check relative circuit
NG
No sound
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