KDS-70R2000 - Sony TV Service Manual (repair manual). Page 10

        2

:

Temp over

When the inside temperature sensed with IC3150, IC3200 and IC2000 mounted on the S1
board, S2 board and C board respectively exceed the threshold, DEM (Display Engin u-com)
detcts it and turns off the lamp.

        3

:

Lamp cover

When the lamp cover is opened or the harness from the T board is off, DEM detects it and
turns off the lamp.

        4

:

FAN error

When any FAN stops or the harness is not connected correctly, DEM detects it and
turns off the lamp.

        5

:

Lamp driver

When the ballast is not working with high voltage, DEM detects it and turns off the lamp.

        6

:

Power error

When the 5V regulated from the 11V is low, TVM (TV u-com)  detects it and turns off the
lamp.

        7

:

Audio

When DC appears on the speaker line because of audio amp failure, DEM detects it and
turns off the lamp.

        8

:

Power-OVP

When the output voltage from the 7V line is abnormally high, TVM detects it and
turns off the lamp.

        9

:

Device error

When the temperature sensor and bus decoder IC’s do not return ACK on IIC bus to DEM,
DEM detects it and turns off the lamp.

        LAMP

:

Lamp

When the lamp is broken, DEM detects it.