Acer AT1921 Service Manual page 40

No Characters , Missing Color
Check M/B CN3
Pin28~30 5V correct?
Yes
Check LVDS cable
No
Check LCD panel
VGA always show No Signal
Check VGA cable
correct?
Check input P2
Pin13 H-sync ,pin14 V-sync
correct?
Check PC
No
Yes
Yes
No
Change
M/B
Change
LVDS cable
No
Change
VGA cable
Yes
Change
M/B