LG Z15LCD1 Service Manual - Page 12

No Display LED indicator green, t start LED indicator yellow

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2. No Display (LED indicator green) No display Check the source OK Check LVDS cable OK Check 5V, 12V power OK NG Reset source NG Replace LVDS cable NG Return to "1" Check main board power supply OK NG Check U406 OK Check I2C communication Replace U406 NG Repair I2C communication relative circuit OK Check panel NG Replace panel 3. Can't start (LED indicator yellow) Can't start Check key board NG Repair the key board OK Check 5V_SB NG Check every chip power supply OK Check I2C communication NG Replace I2C communication component OK Check oscillistor NG Replace oscillistor - 12 -

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- 12 -
2.
No Display (LED indicator green)
3. Can
’
t start (LED indicator yellow)
Check the source
OK
Reset source
NG
Check LVDS cable
NG
Replace LVDS cable
OK
Check 5V, 12V power
NG
Return to “1”
OK
OK
Check U406
NG
Replace U406
OK
OK
Check panel
NG
Replace panel
Check main board power supply
Check I
2
C communication
Repair I
2
C communication relative circuit
NG
No display
NG
Repair the key board
OK
Check 5V_SB
NG
Check every chip power supply
OK
NG
Check I
2
C communication
OK
Check key board
Replace I2C communication component
Check oscillistor
NG
Replace oscillistor
Can’t start