Acer AL702 AL702 Monitor Service Guide - Page 25

13. Checking inverter board circuit Check Vin pin is around 15.5V. On/off pin is over 2V. Brightness pin is between 0V and 3.7V. OK NG It is not inverter problem. Check pin 5 of I102 is 5V. NG OK Check Q101, D101, D104 and repair them. Check CN102, CN103 is connected right. NG OK Check CCFL and repair them. Check pin 3 of I102 is over 2V. NG OK Check Q106, D110 and repair them. Check pin 18 of I102 is triangle pulse. NG OK Check C115, R108, I102 and repair them. Check pin 4 of I102 there is soft start edge up to 4V and pin 11, 12, 19, 20 there is some pulse output. NG OK Repair I102. Check pin 2 of I102 there is up to 2V from output detection. OK NG Check Q102, Q103, CR101, CR103 and repair them. Check full-bridge (I101, I103, D102, D103, C123, C125) work right. NG OK Repair them. Check transformer (T101, T102) work right. NG OK Check detection (C124, C118, C126, CR102 and like those) work right and repair them. Repair them. A LC502 Page 16 Trouble Sh ooting