Bad SMD Capacitor Caused No Display In HAIER LED TV MODEL LE32B9000
This TV was brought by a carpenter who had come home to do some work and happened to see me involved in Electronic service work. In fact, there are quite a few customers who are like him. This is in fact an added advantage whenever we engage someone for work in the house. The complaint was that picture went off suddenly when watching and sound was only heard. My immediate doubt was about backlight, which is quite common.
Anyhow, after opening and cleaning the inside thoroughly, I checked the LED strip using my LED Tester and found it to be working well. The output voltage from the driver of the board was also ok. So, next I probed the voltages on the scaler board and found these missing. In such circumstances, I followed the advice given by my techie friends, by doing a cold test of all the capacitors on the scaler board. By the way, recently I acquired one Microscope and bought an adjustable stand (in fact it was a Mike stand bought from Amazon) as guided by my techie friends.
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This came very handy in viewing the boards, which housed very tiny components, which are very difficult for the naked eye. Using a lens occupies one hand and we won’t be free. Even the table top lens with light does not serve the purpose fully.
As it was dead short, there was no way of knowing its correct value. So, as advised by my techie friends, I looked for a similar capacitor from an old scaler board (which was sent by a second hand dealer) and found it to be reading as 22uF.
Since the defective capacitor was in the DC supply for the level shifter IC, it is very important for replacing it. Then replaced the defective capacitor and powered the TV to see the display back.
Mission accomplished very satisfactorily, though devoid of any exciting challenges, and got added to its bag!
This article was prepared for you by Parasuraman Subramanian from India. He is 72 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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