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Prestigio Cavaliere 141
8.4 VGA Controller Failure LCD No Display
Symptom:
There is no display on LCD although power-on-self-test is passed.
VGA Controller Failure
1. Confirm LCD panel or monitor is good
and check the cable are connected
properly.
2. Try another known good monitor or
LCD module.
Yes
Display
OK?
No
Remove all the I/O device & cable from
motherboard except LCD panel or extended
monitor.
Yes
Display
OK?
No
Troubleshooting
Replace faulty
LCD or monitor.
Connect the I/O device & cable
to the M/B one at a time to find
out which part is causing the
problem.
MB:U505,U503 J1, J2,
Board-level
One of the following parts on the mother-board may be
defective, use an oscilloscope to check the following signal or
replace the parts one at a time and test after each replacement.
Replace
Motherboard
Parts:
U505
U503
U13
Q1
Q2
Q3
RP1
R1
R3
Inverter BD
107
Technical Service Manual
Check if
Yes
Charge BD: J2,J1
are cold colder?
No
Signals:
F1
TXOUTCLK1+
D1
TXOUTCLK1-
D2
TXOUT10+
L1
TXOUT10-
L3
TXOUT11+
R11
TXOUT11-
R2
TXOUT12+
R8
TXOUT12-
C199
FPVCC
+3V_LCDVCC
Re-soldering.
PANEL_ID0
PANEL_ID1
PANEL_ID2
VGA_ENABLE
PCIRST#
ENBL
BLADJ
H8_ENBL
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