DAEWOO ELECTRONICS DPM-42A1GCSB, Service Manual

Page: 86 / 96

2-5. Screen doesn’t be shown at all as
Scan FPC.
(1) It’s may be a problem between Scan FPC and Y DRV B/D.
(2) Check the connection of Y DRV B/D and Scan FPC.
(3) If the Scan IC is failed, replace the Y DRV B/D.
Screen Display Form
Check a method of SCAN IC
Change the Vpp Pin into ANODE and GND Pin into CATHOD
and then test the Diode with forward or reverse direction.
2-6. Regular stripe is generated at regular
internal on the whole screen.
(A vertical stripe flash at especial
color)
(1) This is a problem about CTRL B/D.
(2) Replace the CTRL B/D.
Screen Display Form
2-7. Data copy is generated to stripe
direction.
(1) In this case, it’s due to incorrect marking of scan wave.
(2) Replace the Y DRV B/D or Y B/D.
Screen Display Form
one ten of
screen
The screen display is very good
The screen display is poor
The screen has a vertical line
with regular gap
<Display Pattern> <Case 1 : Entire Copy>
<Case 2 : Top Copy> <Case 3 : Bottom Copy> <Case 2 : Entire Copy>