* Top or Bottom ½ of the picture is black.
** SHUT DOWN AT TURN ON
* When the set turns on, either the Top or Bottom ½ of the picture is black.
# It is possible that the whole picture could be black if P207 or P207(Y-SUS) is involved.
# Look carefully the connections between the Y-SUS and Upper and Lower Y-Drive boards.
# It is possible that these can be improperly seated.
# Remove and re-seat the board correctly.
Note:This can happen if either the Y-SUS or Y-Drive boards are replaced or pulled off to perform checks.
Note:This can happen if either the Y-SUS or Y-Drive boards are replaced or pulled off to perform checks.
SHUT DOWN AT TURN ON
Check
* V-Scan signal input to Lower Y-Drive board low ohms or low volts (Diode Mode).
* Output from any buffer shows low ohms or low volts (Diode Mode).
Defective Y-Drive Upper or Lower.
After determining which Y-Drive board is defective using the checks, the other board can be tested separately.
After determining which Y-Drive board is defective using the checks, the other board can be tested separately.
* If the Upper Y-Drive is found defective, the Lower Y-Drive board can be tested.
> Remove the Upper Y-Drive. Disconnect the Connector P209.
> Turn on the set and confirm that the bottom half of the picture looks normal.
> Remove the Upper Y-Drive. Disconnect the Connector P209.
> Turn on the set and confirm that the bottom half of the picture looks normal.
* If the Lower Y-Drive is found defective, the Upper Y-Drive board can be tested.
> Remove the Lower Y-Drive.
> Disconnect the Connector P209.
> Remove the Lower Y-Drive.
> Disconnect the Connector P209.
* Jump either Pin 1 or 2 of P207 (V-Scan from the Y-SUS) to pin 4 or 5 of connector P108 on the Upper Y-Drive board.
* Turn on the set and confirm that the top half of the picture looks normal.
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Click on the pictures to Magnify
