Abnormal Screen; Abnormal Screen For Vga Source - HP R15AAC Service Manual

6.

Abnormal screen

6.1 Abnormal screen for VGA source

Check the R, G, B video signal from computer
input on P302 of video connector.
Check the R, G, B input video signals on I307
pin93, 96, 99 respectively that their level is 0.5
Check all LVDS signals being output to P306
Prpcess "Checking the resolution change IC
NG
OK
to 0.7Vp-p.
NG
OK
from I307?
NG
OK
movement" section.
Failure Point
1) No R, G, B video signals output from host
computer, check computer.
2) VGA video signal cable disconnection.
Failure Point
In the case of the Red signal. (Green and Blue
signal is the same path, too.)
1) Printed wire broke between P303 pin 1 and
I307 pin99.
2) Video cable is failure.
3) FB308, FB309, R313 are open.
4) R318 is short.
5) C325 is short or open.
6) C329 is short.
Failure Point
1) Printed wire broke between I311 and P305.
2) LVDS cable failure.
R15AAC/AAU (vs15)
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