PANASONIC PLASMA 9th GENERATION TVs_FAULT FINDING METHODS

                                                 [3]
NO VIDEO - NO OSD

• Unplug the unit from AC outlet.
• Disconnect the connector 'DG-5' from the 'DG' board.
• Plug the unit into AC power socket.
• If the unit displays a white screen, it is a video processing problem.
• If the unit does not show a white screen, check panel drive circuits.

                                                             DG-5 {Close up view}

ISOLATION OF THE 'SC' AND 'SS' BOARDS.

1. If any of the connectors providing the 15V or VSUS voltage to the SC or SS board is disconnected, while the connectors that provides the scan and Sustain Drive pulses from the D broad are still connected, the TV will shut down. {Do not let the TV run for more than 30 seconds while isolating any of the circuit board for testing.}  The Scan Board [SC] and Sustain Board [SS] could be measly isolated. This can be useful to diagnose:

• Shutdown problems.
• Video problems.

ISOLATION OF THE [SC} BOARD.

Supply voltage =VSUS {connector SC2} 15V {Connector S23] from power supply 'P' board.

Scan control pulses = connector SC20 from the SC board.

SC board completely isolated from the sources 'P' & 'D' boards.  This is useful when Power LED blinks 6 or 7 times. Screenshot:

Form the above picture:

• If only SC is disconnected, while SC23 and SC20 are connected, the Power LED blinks 6 times.
• If only SC23 is disconnected, while SC2 and SC20 are connected, Power LED blinks 7 times.
• If both SC2 and SC23 are disconnected, while SC20 is still connected, Power LED blinks 7 times again.
• If SC20 is disconnected while SC2 and SC23 are still concerted  the Power Turns ON [Black picture, No OSD, Sound OK and there should be video out of the monitor jack.  SS LED is On, and SC LED is off.

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