Service Manual
Model
Model
Model
Model No.:
No.:
No.:
No.: 75UF5550
75UF5550
75UF5550
75UF5550
9-3.
9-3.
9-3.
9-3. Mainboard
Mainboard
Mainboard
Mainboard Failure
Failure
Failure
Failure Check
Check
Check
Check
No picture but have sound
Check the power output
No
Change the Power Board
Yes
Check the CON2 (BLO)
Backlight on/off
Yes
No
There’s something wrong
with FRC
Verify if the DC/DC
convertor can output the
right Voltage,
No
Change the corresponding
DC/DC
QM4 output 12V
Yes
No
Verify if
QM4
output
Change
the QM4
Yes
Still having
problems
Change Panel
Change LVDS wire
39
39
39
39
