Vga Controller Failure Lcd No Display - Prestigio NOBILE 150 Technical & Service Manual

TECHNICAL SERVICE MANUAL

8.3 VGA Controller Failure LCD No Display

There is no display or picture abnormal on LCD although power-on-self-test is passed.
VGA Controller Failure
LCD No Display
1. Confirm LCD panel or monitor is good
and check the cable are connected
properly.
2. Try another known good monitor or
LCD module.
Display
OK?
No
Remove all the I/O device & cable from
motherboard except LCD panel or
extended monitor.
Display
OK?
No
Yes
Replace faulty
LCD or monitor.
Connect the I/O device & cable to
Yes
the M/B one at a time to find out
which part is causing the problem.
Board-level
Troubleshooting
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.
Parts:
Replace
D1
Motherboard
R11
Q1
F1
PU1
L2
R10
R6
J1
J3
118
Check if
Yes
Re-soldering.
J1, J3 are cold
solder?
No
Signals:
L8 +3V
L37 LCDVCC
L6 FPVDD
L7 LCD_ID[0..2]
U3 TXOUT[0..2]+
F3 TXOUT[0..2]-
Q23 TXCLKOUT0+
U504 TXCLKOUT0-
U12 ENBL
U7 LCD_PCIRST#
ENABLE_BKLT
+VMAIN_INV
Prestigio Nobile 150