Main Board Failure Check - Haier L22B1120 Service Manual

9-2. Main board failure check

Service guide
1) Black creen
Is power LCD normal?
6
5
J15
J15
2 Check Q2,Q3 and the
11
2
2) White screen
on VCC pins of J9
Check if Q31 is working
Signal on J9
Check if J9 is
- 44 -