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Slide #63
SU and SD Boards Isolation Procedure
To isolate the SU and SD boards at the same time is not necessary to remove the
boards:
• Remove the 4 VF_GND screws (2 on the SU board and 2 on the SD board).
• Unplug connectors SC41, SC46, and SC42 on the SC board.
• Place a jumper between pins 1 and 2 of the empty connector SC50.
When this is done, the display is completely black (No picture)
Note: This procedure could be useful when troubleshooting 7 blinks problems.
Beginning last year (2008), the new plasma models are now designed not to turn-
on if either the SU or SD board is disconnected.
Disconnecting either causes the unit to shutdown and the power LED to blink 7
times.
Unplugging any of the connectors SC41/SU41, SU11/SD11, and
SC42/SD42, opens the interlocked connection between VF_GND and CHA on the
SC board. This floats point “CHA” and Q16471 turns on. IC16561 outputs a high to
pin 21 of connector SC20 triggering shutdown.