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How To Repair Toshiba LED TV With No Power Symptom
Customer sent to me this 32″ LED Toshiba TV with the complaint of no power. I have checked the TV and it was indeed no power and I had to removed the cover.
Once the cover was removed I could see the two main important circuit boards which is the power and the mainboard-see the photos below:
The main fuse was checked and it was good and there was no sign of any burnt components from the visual inspection. I powered On the power supply and checked the output and all the output voltages were zero volt (photo below) which indicated the power supply is the cause of the problem.
In order to safely check electronic components in the circuit board, one must discharge the big filter capacitor first-see the big capacitor in the below photo and it was rated as 150uf 450 volt. This discharge is for precaution purpose.
After I had discharged the big filter capacitor, I started to check on the secondary output diodes. Checking one of the secondary output diodes revealed that it was shorted-photo below:
The shorted diode was actually connected in parallel with the other two output diodes. I soldered the shorted diode and powered on the TV just to check if the power would work.
As expected, the power LED was lighted and this confirmed only one secondary output diode shorted.
After the replacement with a new diode and powered On, the below picture is what I saw. This means this Toshiba 32 ” LED TV with no power symptom is only caused by a shorted diode and nothing else.
By the way Kent just launched his latest Ebook in OLED/LED/LCD TV repair tips version 5-you can check out the link HERE.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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