Acer AL2021 AL2021 Service Guide - Page 32

TROUBLE SHOOTING This chapter provides trouble shooting information forAL2010 Chapter 4 1. No Power No Power Check Power Button From Main /B(CN1) to Button/B(CN1) OK Check power moduleOutput CN1 Pin 1 = on/off (Backlight) ? Pin 2 = Adj (Backlight) ? Pin 3,4 = GND ? Pin 5 = NC ? Pin 6,7 = +12V ? OK Check Main module Input CN1 Pin define same as power module CN1 OK Check Main module FUSE 1 ? U2 Pin 6 = 12V ? L4 = +5V Output ? D3 ? OK Change Main board No Check cable Yes Open ? Change Cable No Change Switch or Button board No Change Power module No Change Cable From (power module)CN1 to (Main/B) CN1 No Change Fuse1 or U2 or Q6 or D1 or D2 or Q7 or D3 - 32 -