Acer AL2002 AL2002 Service Guide - Page 41

Checking the backlight unit Is +12V supplied to inverter PWB? (input from Power Board) Appendix 4: Troubleshooting Failure Point: NG 1. Inverter cable disconnected. 2. Power board is failure. ACER AL2002W 5 Go to cover page OK Check the BL_ENABLE signal of the rectangle input P301 pin2 at TTL high level Failure Point: 1. Printed wire open between R305 and I306 pin49. NG 2. R305 is open or short. 3. I306 is failure. OK Check the BKLT_ADJ signal of the input P301 pin3 from I306 pin50 is a PWM signal OK Failure Point: Backlight unit of LCD module is failure. Failure Point: 1. Printed wire is open between P301 pin3 ,R304, Q301, NG R301, R302 and I306 pin50. 2. R304,Q301,R301 or R302 is failure. 3. I306 is failure.