Daewoo DX-N111N, Service Manual

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17
TROUBLESHOOTING
16
TROUBLESHOOTING
No output 3.3V of IC 803
Check the pin 11-14 in IC 803
42V Oscillation.
Check the pin 25 in IC 803
25V Oscillation.
Check the pin 8 in IC 803
10V Oscillation.The same frequency
Of Pin25 in IC803.
Check the D832,L831,IC803
Check the D831,IC803
NO
Check the previous
Power circuit
NO
YES
YES
YES
Check the D831,IC803
NO
NO
Check the 18-21 pin IC803
Vdd =Vin
2. VIDEO
The Input signal is the color bar for the video test.
Check the 29-29,31-34
In IC302. You can see the 8bit
digital signal.
Also Pin 12-15,17-20
in IC601 and JP313-JP320.
Check Pin52 in IC501,Analog Video
Signal in this port.
Check the pattern or
Replace the IC302 or
Replace the JP.
NO
Check the pattern and P901,P301
and Flat cable.
NO
YES
YES
YES
Check the Pin1,8 in IC308
YES
Check the Pin3,6 in IC308 or
Pin 9 in P301 or Pin9 in P901.
YES
Check the Pin 9 in P301 or
Pin9 in P901.
YES
You can find the color bar
signal at P901,P301 pin 1