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MAP3202 LED Driver IC Failure In 42″ LED TV
A friend of mine who works in a hard ware store brought me this TV for repair. It belongs to his mother in law. According to this lady, the TV stopped working without any notice. She explained that there was no indication of life in it.
This is a Korean made TV and I guess it was worth the repair. As I powered the TV up while customer awaits, the stand by light came on flashing and then the TV panel flashed for second then I could see the logo come on display but there was no back light to see what on the panel.
I used a flash light to check the display. Sorry I was not able to take photos of that since the customer was with me up to the moment I decided to take it apart and see.
Usually with this kind of symptoms, the main fault would be the back light not coming on because there is a shorted LED light in one of the lights or the back light boost circuit is faulty.
Here is the power supply and the main focus would be on the back light connector. When I tested with the multi meter the voltages that were supposed to be there, there was none. That is a clear indication that the power supply is faulty or the back light caused the black light circuit to go bad simply there was short in the back LED lights.
I first tested the LED lights with a special LED tester that I bought online. That saved me a lot of time taking the panel off to find out that there is nothing wrong with the LED lights. The back LED lights were in good working conditions.
As I tested the back light boost circuit, there were voltages reaching the IC but nothing was coming out. My logic sense was to replace the IC and hope for the best. The IC that you see in the photo is the replaced new one. I had a lot of these in my shop and they are very easy to find. The part number is MAP 3202. Here are the specs:
Please click on the photo above to access to the IC’s datasheet.
This is the old faulty part that was found in the back light boost circuit. The moment I powered up the TV, I got this.
I let it run for sometimes and it passed the test. The lady came with her son in law to get the TV. They were so happy to see the TV alive again and she was very generous in giving. Mission accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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