Daewoo DLP-20D7 - Troubleshooting: No Picture in TV Mode

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Trouble Shooting
7-4. When “No picture” in TV mode.
Does raster appear?
Does LED turn on in GREEN?
Does auto - tuning
Function operate
normally?
Go to chap 7 - 2
Check start
Y
N
N
N
Y
Y
Y
Tune the channel
Check the tuner
Is this weak discharge
On the screen?
Is input of YUV normal?
(I501, A15, B14, B15)
Is input of RGB normal?
(R203, R207, R211)
Confirm AC connection.
Confirm Power SW ON.
Check the power,
Inverter and panel
Check I504
Check RA80,81,82
N
N
N
Check I402
N
Y
Y
Y
Is input of sync normal?
(I501, Y1, Y2)
Y
Check I501