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-see the photo below:
Conclusion- If the power supply DC output voltages are good then focus on the Tcon board. Check the VCC supply to the Tcon 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.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments. If you have electronic repair articles to share with us, please contact us HERE.
P.S- If you enjoyed reading the above article, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
Note: You may check out his previous post in the below links: