Panasonic P50GT30 Service Manual page 31

10.1.2. RF video sub contrast adjustment
1. REMOTE TRANSMITTER
2. RF analog signal (Sprit color bar. The pattern for adjustment must contain 100% white part.)
1. Receive the sprit color bar with RF analog signal.
(ASPECT FULL, Picture menu: Vivid)
2. Enter Service mode menu, and select ADJUST -- CONTRAST.
Pushing the remote controller [OK] key for about 3 seconds, GAIN is suited to the adjustment value automatically.
Instrument Name
Adjustment or Inspection Procedure
31
Remarks
Remarks