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Slide #55
8 Blinks Error Code (TC-P42X1) Circuit Explanation
On this model, only the circuit used to monitor for physical connection between the
panel and the SS board is used to trigger an 8 blinks condition. The energy-recovery-
circuit portion used to monitor the operation of the sustain drive circuit is located
on the SC board.
Under normal condition, Q16280 is on.
When Q16280 is on, a low is provided to the anode of D16280 (D280).
If one of the FPC cables is open, Q16280 turns off and a high is provided to the
anode of D16280 (D280). This high is provided to pin 66 of the CPU in the
A board. When this happens, the TV shuts down and the power LED blinks
8 times.
To determine if the 8 blinks is caused by the A board, SS board, or the Panel:
• Isolate the SS board and check if the TV stays on when it’s turned on.
• If the TV does not stay on after disconnecting the SS board, the A board is
defective.
• If the TV stays on, then the SS is bad, the FPC cables are open, or the Panel is
defective.
To isolate the SS board for 8 blinks condition:
Remove SS23 and see if the TV stays on