Generated During Full-Black-Screen; Pattern; Some Lightness Of Some Color Doesn't Not Generated Well - Daewoo DP-42SM Service Manual

Trouble Shooting
4-2-11. The screen displays other color partially on full white screen or happens discharge partially
on full black screen.
(1) Check the declination of Y B/D set up, set down wave.
(2) Check the declination of Z B/D ramp wave.
(3) Measure each output wave with oscilloscope (more than 200MHz) and compare the data
with below figure data.
Adjust the Y B/D set up(Test-up:B/C[ / ] - VR1)/setdown(Test-down:D[ ] - VR2) and Z
B/D ramp(Tramp:F/G[ / ] - VR3) declination by changing VR1/VR2/VR3.
- Measuring Point of Y B/D : P4 (Connector P4 36 pin)
- Measuring Point of Z B/D : B37 (SUS_OUT)
4-2-12. A center of screen is darker than a edge of screen at full white pattern.
(1) In this case, it's a problem about Z B/D ramp wave.
(2) Check the connection cable of Z B/D and CTRL B/D.
(3) Replace the Z B/D.
* Screen Display Form
4-2-13. It doesn't display a specified brightness at specified color
(1) Check the connector of CTRL B/D input signal.
(2) Replace the CTRL B/D.
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