Troubleshooting 6 Blinks Failure (1 Of 2) - Panasonic G20 Series Troubleshooting Handbook

Troubleshooting 6 Blinks Failure (1 of 2)

Cautions: Disconnect the AC Power prior to making any disconnection or connection.
If the power LED continues to blink even after the TV is unplugged, press and hold the power switch on the TV for a few
seconds until the LED turns off.
When taking voltage reading, place the voltmeter probe at the test point, component, or connector's pin indicated before
connecting the TV to the AC line. This will ensure voltage reading accuracy before the TV shuts down. (Since the TV is
shutting down, expect the voltage to only come up a couple of seconds.)
Blink List of boards likely to cause this symptom. (Based on actual reports and circuit operation).
Code
Most Common
6 SC
This part can possibly cause this
error code, but so far there has
not been any report of this part
causing this symptom.
Energy Recovery/Vscan
The energy recovery circuit and Vscan are monitored in the SC board. Failure of any these 2 circuits triggers the SOS6
line causing the unit to shut down and the power LED to blink 6 times.
Under normal operation, the output voltage (MID) of the "Energy Recovery" circuit ranges between 68V and 138V. If the
voltage drops below 67V or increases above 139V, the error detect circuit (IC16581) is triggered. This causes a high to be
output to pin 21 of connector SC20.
Pin 21of SC20 also goes high, if the Vscan generating circuit fails.
The voltage from SC20 is connected to pin 90 the SYSTEM MPU (IC1100) in the A board via the ANALOG-ASIC(IC5480).
When pin 90 of the SYSTEM MPU (IC1100) goes high, the TV shuts down and the power LED blinks 6 times.
This condition is normally caused by the SC, A, or P board. (SC>A>P).
6 blinks can also be caused by open connection between the C boards and open connection between any of the C board
and the A board.
nd rd
2 3
SD A
This part can possibly cause
this error code and it has
been confirmed to cause this
symptom.
th th
4 5
C
Technically, this part is not likely
to cause this error code, but it
has been confirmed to cause this
symptom.
th th
6 7
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