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Trouble 4
Inverter
trouble
Trouble 5
no
Check U101
RGB OUT
Check U101
power supply
Change U101
Trouble 6
no VSYNC
Check Q172,
Q171, C172 etc.
Check C191
yes
ok
Change the
inverter
yes
Check the TTL
ok
on XS5011 signal
pin by oscilloscope
yes
Change the wiring
for connect to the
panel
Change the
panel
Asynchronous
field
Check U401
VSYNC&HSYNC
Dark
backlight
CN551
Pin3,4>1.5v?
no
abnormal
Panel
Change
trouble
Q561,Q551
Black or white screen
3.3v or 5v or 12v
from XS411 pin1,2,4
abnormal
ok
Change
U401
yes
U541 Pin2,4
low level
abnormal
Change
U541
Change
no HSYNC
Check Q161, Q162
etc.
Check R182,
C185, C188, C184
no
Check
ok
Q561,Q551
Change
U401
no
no
Check U541
Pin1,3
Check 3.3Vor
5v or 12v
no
Check
Q541
U101 P3.2
Q541
High level
Chang
ok
no
U101
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