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No Display In Samsung 32″ LED TV Repaired
This Samsung 32″ LED TV came in for repair with the complaint of no display. When i used a torch light to shine at the panel, I could see faint picture (TV Channel logo). This means the power section, mainboard and even the panel are good.
The problem is either the LED backlight or the LED driver circuit. The photos below are the mainboard and power supply board. The LED driver board is built into the power supply board.
I have checked the dc voltage to the LED backlight and found that the DC voltage came and dropped back to zero. This indicated there was problem with the backlight LED. If one of the LEDs in the backlight strip have problem the voltage will drop.
Next, I dismantled the panel and you must take great care of it otherwise if the TAB bonding breaks, it would be difficult to repair it unless if you have a special machine for this.
I checked each LEDs and found only one that was not lighted at all when test it with meter set to diode mode.
I do not have the ready part for this LED so I installed a used LED from another junk LED TV .
Once the LED is fixed and powered On, take a look at the photos below:
Conclusion- It is not tough to repair LED TV with dim display problem. Just follow my procedure and I believe you can repair it very fast. If you want to be good in repairing LCD/LED TVs, you can check out Kent’s ebook here.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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