AUO 11303
LCD TV T-Con IC Faulty
This Changhong LCD TV came in for repair with the complaint of no picture but have sound. In fact when you look closely at the screen you will be able to see the backlight was lighted. There can be few causes of such problem.
Instead of guessing
what might be the cause, I opened the TV cover and checked on the power supply
DC output voltages. All DC output voltages were found to be correct.
The next check was
on the T-con board IC (AUO -11303) and the cable connection. I reheated the
T-con IC and reseated the cable (and cleaned the connector) and the problem
turned out to be the same. When I turned the TV On, I could only saw the
backlight lighted without any picture-see the three photos below:
Next step was to
replace the AUO-11303 IC directly and retest it.
After the replacement of the ic, the picture came back normal-see the photo below
Conclusion- If the
power supply DC output voltages are good then focus on the T-con board. Check
the VCC supply to the T-con board IC and make sure the IC is not too hot to be
touched and reheat it.
If the problem
still not resolved then direct replace the IC and retest it. If after the
replacement of the IC and still not be able to repair it, the next step would
be to find out the service manual and start checking the important signals pin
in the T-con board.
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