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Slide #64
SU Board Isolation
The 2008 and 2009 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 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 a high
is output to connector SC20 triggering shutdown.
To isolate the SU board:
• Remove the 2 VF_GND screws on the SU board only.
• Unplug connector SC41 on the SC board and SU11 on
SU board.
• Place a jumper between pins 1 and 2 of the empty
connector SC50.
Note: This procedure could be useful when
troubleshooting 7 blinks problems.