Acer A221HQV Service Manual page 59

5.4.2 For Inverter Circuit on Power Board (1A1D1H/1A1D/1A):
Check C102 pin is around 5V. ON/OFF pin of P802 is over
2V. Brightness pin is external 3.3V
Check pin 2 of I101 is 5V
Check P103, P104 are connected right
Check P11 of I101 is over 2.83V
Check pin 1&pin 16 of I101 is triangle pulse
Check pin 14 of I101, there is soft start edge up to about
Check pin 9&pin 10 of I101, there is around 0.91V
from output detection
Check SW MOS (Q101, Q105) work right
Check transformer (T101) to work it and repair it
5. Troubleshooting (continued)
OK NG
OK NG
OK NG
OK
OK NG
OK NG
1.2V
OK
NG
OK NG
OK
NG
ACER A211H/A221HQ
It is not inverter problem
Check R105, C102 and repair
them. Check printed wire
Check CCFL and repair them. Lock
P103, P104 tightly
Check R125, R126, R106, R107,
D109, D118, C119 I101 and repair
them
Check R115, R110, I101 and repair
them
Repair I101
Check R137, R118, R119, R117,
R138, and repair them
Repair them
57
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