Adapter Voltage of Laptop

Flashbear

Estimable
Jan 20, 2015
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I am repairing an Acer Aspire One Happy,
The Problem is, when i turn on the the unit, I see no images.
But when i watch is closely with a Lamp, I can see the desktop images and letters. what can cause this problem? do I have to change the LCD screen?
and here's one thing. When I read the voltage of the power adapter, it has

output : 19 V , 2.15A
Input : 100-200V~1.2A, 50-60Hz

then the battery power is
11.1V, 2.12Ah

is that making the Problem?
thank you vey much.
 
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