SET SHUTS DOWN AT TURN ON - LG50PQ30 - PLASMA TV

* 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.

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.

* 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.

* 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.

* 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.

Click on the pictures to Magnify