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No Power In Philips CRT TV Repaired
The complaint of this 21″ Philips CRT TV was no power. The first thing to do is to remove the cover and check the circuit board especially the fuse.
Before I check the fuse I cleaned up the circuit board first that was full of dirt and dust.
After cleaning up the circuit board I took out my digital multimeter and set to buzzer range and measured the main fuse. It was opened circuit because there was no reading registered in my multimeter.
I did not stop there as I proceeded to check on the corresponding components especially the 4 bridge diodes. I found two of the 4 diodes were shorted and this is the cause why the main fuse was opened circuit.
If one or two bride diodes were shorted the best is to replace all the other diodes. If you replace only the two faulty diodes, the other two diodes will get shorted later. I order to prevent repeat call from the customer, direct replace the 4 diodes even if you found only one shorted.
I did not connect the fuse after the replacement of the 4 diodes because I want to connect a 40 watt bulb to check if there is any other short circuit in the board.
The bulb lighted up for a while and then went off which indicates there is no longer short circuit in the circuit board and I can connect back the main fuse and power On the TV. The TV infact was working fine once the power was switched On-see the photo below:
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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