Chapter 4 Troble Shooting; Trouble Shooting - Acer AL2021 Service Manual

TROUBLE SHOOTING

This chapter provides trouble shooting information forAL2010
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
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Chapter 4
Yes
Check cable
No
Open ?
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
Change Cable