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Singer 32″ Skyworth LED TV With Dim Display Repair
The complaint of this Singer Skyworth 32″ LED TV was no display but when I used a torch light to shine at the screen I could see dim display picture. This means the actual fault was dim display and not no display.
The cause of this problem was the LED backlight circuit not functioning-see the photo below:
As usual, in order to repair any electronic equipment one has to open up the cover. In this LED TV, it was easy to remove the screws and the cover can be lifted out easily. Once the cover was removed, I could see the mainboard and the power supply/ LED driver board. The LED controller board was located at the top part (long horizontal circuit board).
The first thing I do was to check on the output voltage to the LED backlights.
From the board marking of the LED backlight connector, it stated 60 vdc which means 60 dc volt is required to light up the LED backlight. However, from the measurement I’ve got only 26.6 volt which is abnormal.
So, I proceeded to trace the 60 volts line from the back of the connector and the line brought me to a circuit that has two big SMD diodes-see the photo below:
I took out both diodes to check (checking diodes off board is much accurate than to check it on board) and found one was shorted and the other one good-see the two photos below:
Since I do not have this kind of diode, I used a axial lead fast recovery diode with 3 ampere as replacement. I had to cut away the long lead and slowly position the diode onto the original location
After the installation of the diode, I powered On the LED TV and as expected, I’ve got 62.7 volt at the LED backlight connector.
The below two pictures is what I saw when everything were put back. Another job done and made some profits from this repair. If you wish to learn how to repair LED TV you can check out Kent’s and Damon’s ebook.
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous repair article in the below link: