Panel Mpu Sos Detect (Continue) - Panasonic TC-P42X1 Technical Manual

Panel MPU SOS Detect (Continue)

4 Blinks SOS: When an over voltage condition of the voltage lines from the power supply occurs,
pin 12 of connector P25 goes high. This high is provided to pin 67 of IC9003 of the A board
triggering the "POWER SOS" circuit. When this happens, the TV shuts down and the power LED
blinks 4 times. Primarily the P board causes 4 blinks, followed by the A board.
5 Blinks SOS: Pin 60 of the CPU IC9003 monitors the 5V line. During normal operation, pin 60 is
kept high. If the 5V line is missing or shorted, a low is provided to pin 60. As a result, the unit shuts
down and the power LED blinks 5 times.
6 Blinks SOS: Pin 65 of the CPU IC9003 monitors the status of the SC board. During normal
operation, a low is applied to pin 65. If the SC board becomes defective, a high is provided to pin
65. As a result, the unit shuts down and the power LED blinks 6 times.
The TC-P42X1 series monitors the sustain board output. This signal is connected to the recovery
circuit in the SC board. Any abnormality on the sustain board will trigger the 6 blinks code.
7 Blinks SOS: Pin 68 of the CPU IC9003 monitors the status of the SC, SU, SD board. During
normal operation, a low is applied to pin 68. If the SC, SU, or SD board becomes defective, a high
is provided to pin 68. As a result, the unit shuts down and the power LED blinks 7 times.
8 Blinks SOS: Pin 66 of the MPU IC9003 monitors the status of the SS board. During normal
operation, pin 8 of connector SS33 outputs a low to pin 66. If the SS board becomes defective, a
high is provided to pin 66. As a result, the unit shuts down and the power LED blinks 8 times.
8 Blinks condition is also caused when the connections between the panel's flex-cables and the
sustain board is broken.
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