Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 59

5. Troubleshooting (continued) ACER A211H/A221HQ 57 Go to contents page 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 OK NG Check pin 2 of I101 is 5V OK NG Check P103, P104 are connected right OK NG Check P11 of OI1K01 is over 2.83V OK NG Check pin 1&pin 16 of I101 is triangle pulse OK NG Check pin 14 of I101, there is soft start edge up to about 1.2V OK NG Check pin 9&pin 10 of I101, there is around 0.91V from output detection OK NG Check SW MOS (Q101, Q105) work right OK NG Check transformer (T101) to work it and repair it 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