Daewoo DSC-30W60N Service Manual page 31

Troubleshooting charts
No Raster
Press POWER button, and wait for 2 minutes.
Power LED keeps continuously lighting up green.
YES
IC212 communicates with I402 on the IIC bus.
Check the pins 3 (SDA) and 4 (SCL) of I402.
NO
Check IC212
and I402.
Vertical Deflection
Horizontal Deflection
Check H Drive signal to emitter of Q420.
33.75KHz
NO
5Vp-p
YES
Check pin 17 (H-Drive output) of I402.
33.75KHz
12Vp-p
30
Check if TV micro- processor (IC212) communicates
with DTV Decoder module on UART.
If the LED changes from green to red, check pin 39
(TXD) of IC212.
Check the pin 38 (RXD) of IC212 or pin 6 of PA05D.
0.7Vp-p
High Voltage Drive
HD1
5Vp-p
3.3Vp-p
To DTV Decoder module