Acer MB243WABNS service manual Troubleshooting Abnormal Screen

5. Troubleshooting (continued)

5.4 Abnormal Screen:

ACER G24 23

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Check R.G.B video signals

output from PC host

to D-Sub R.G.B connector

OK

Check the R.G.B signals

on I314 pin40, pin42, and pin45 which should have voltage level at 0.7Vpp max.

OK

Check all LVDS signal pins

of I314 whether if

output correct signals.

Failure Point

NG 1. Check connected PC host if there’s no R.G.B signals output.

2. Video signal cable disconnected.

		Failure Point
	Green, Blue, Red signals are flow in the same
	path. In the case, the Red signal is example.
	1.	Printed wire is broken between D-Sub [R] and
		I314 pin45.
NG
	2.	R391 is short.
	3.	C356 is open.
	4.	R390 is open.

		Failure Point
	1.	The I314 is defected.
NG
	2.	Printed wire is broken between I314 and P306.

OK

Proceed to “5.8 Checking the resolution change

IC movement” section.