Lcd Black Screen - LG KG110 Service Manual

4.8.2 LCD Black Screen

Checking Flow
Checking Flow
Can the PCB
board power on Yes
normally?
Go to power on trouble
sector
Circuit Diagram
Circuit Diagram
Figure 4-18
Figure 4-18
Voltage at one
point of C324 Yes
equal to Vbat?
Check Vbat, and replace
C324
Replace LCD module Yes
57
4. TROUBLE SHOOTING
R346
C323
U300
C324
Voltage at pin3
of U300 is equal Yes
to 2.8V?
Check R346 and re- Replace U300 and Check
download software
Are R302 and
R303 ok?
Replace two resistors
Voltage at pin 1
of U300 is equal
to 5V?
Yes
C323 is ok?
Replace C323