11 Blinks Error Code Explanation - Panasonic TC-P50VT20 Technical Manual

11 Blinks Error Code Explanation

The internal temperature of the unit is monitored by the digital temperature sensor (IC9002).
Variations in temperature are sensed by the IC and reported to the D board MPU (IC9003) via the
SDA02 bus line. IC9003 then conveys the information to the A board MPU (IC1100) via the SDA1
bus line. Fan speed is controlled by IC9003.
The ventilation fans are monitored to be sure they are operating properly. If one of the fans opens
or increases resistance, the resulting current change is applied to pin 61 of the main CPU
(IC1100).
The fan drive circuit is located on the A board. To control the speed of the fan, a control voltage
from the microprocessor(IC1100) is applied to IC5740.
If any of the fans is removed or becomes defective, a high is output at the corresponding pin (pin
3, 9, or 12) of the fan connector (A30) to forward bias the inline diode. The DC output of the diode
is provided to pin 61 of IC1100 to trigger the SOS condition.
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