Suoer DVD Player No Power Repaired
The complaint of this Suoer DVD Player was no power and the first thing to do is to remove the cover and check on the switch mode power supply.
Upon visual inspection I found that the main fuse was blown and checking it with multimeter (just to show you how is the reading of an open fuse) shown “1”.
There must be a reason why the fuse blown so badly (dark in color). This could mean there was a severe shorted components in the power supply. The first component after the fuse was the bridge rectifier. Some design came in a package form and some has 4 individual diodes. In this power supply design, it was using the 4 individual diodes and when I checked all the diodes with my multimeter I found all of them were shorted. Sometimes it can be only one or two diodes shorted.
The next test was to check on the big fat capacitor and surprisingly this capacitor also have problem. The internal electrolyte spilled out at the bottom as you can see from the photo below:
I proceeded to check on the power transistor (13005=MJE13005) and it was shorted too. Checking the corresponding components found another transistor shorted (C945).
In total there were 8 components that were shorted or bad ( including the main fuse)- see the photo below:
After the replacement with the new components I tested the power supply with a 40 watt light bulb that was connected across the main fuse. It went dim and this was a good sign to put in the fuse and power On.
Below is the connector with all the output voltages marking and from the voltmeter test, all output voltages were within range.
Fixing back the power supply and the DVD player worked like a new set. If you wish to test electronic components, you can go to this website and if you wish to learn how to fix DVD player you can visit this website.
All the best
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: