Polaroid V23D series Service Manual page 26

(2) Picture abnormal
The Ver. Or Hor.
Sync. does not
hold
in any source
No
Erase
EEPROM, and
then check the
picture is
Yes
Are the panel
No
cables (P005)
attached
correctly?
Yes
Replace V901
(LCD panel)
End
Re-plug the
No
panel cable, and
check the
picture
Yes
Yes
25
否
Check side SMD of
I019&I020 is welded
correctly?
Yes
No
After welding,
then check the
picture.
Change main
board (PWB-0812),
Yes
and check picture.
No
Change Power
Yes
Module, and check
picture
No
Change Inverter
Yes
and check picture
No
No