CRYSTAL DVD Player Brought Back To Life
My friend calls me to come to his house yesterday. He doesn’t explain why, I just came as a friend. I arrived at his house and asked him what happened. He explained that his DVD just dead and he could smell that is something burnt from DVD. I try to turn it on, but no signs of life. From my deduction, there is something burnt or shorted on this DVD power supply which prevented it to turn on. DVD’s brand is CRYSTAL and no model number was found.
I took this to my home because I don’t take my equipments with me. After I took the cover off, sure enough I can see main capacitor bulged slightly and the glue has a brown color. This glue always make power supply failed because it can cause shorted between the component leg.
Make sure to clean this glue when you repair electronics equipment. You can see the capacitor’s leg corroded too and we have to change it. I test the fuse, the result is no continuity and it looks like there is heavy shorted in primary side.
I test main capacitor with my homemade ESR Meter and the needle didn’t show any deflection. The ESR value is gone high and when I test this with continuity mode with my analog multimeter, the needle move to 0 ohms and didn’t move back because good capacitor will make the needle of the meter move to 0 ohms and moving back to infinity.
One of bridge diodes also shorted, I just change all of bridge diodes from Mr. Jestine Yong advice on his one of article. The coil for EMI filter looks burnt too, I make sure this with my Ring tester and it was shorted.
It took several minutes to analyze all of primary side components and found the components in the below picture were faulty.
You can see the fuse is bad and two capacitors was cover with some glue that causes it to short, these mylar capacitor beside IC still has a good capacitance value but I just change it for safety. As soon as I know the culprits, I search my components storage to change it. After all of my effort I ready to test it, for the first time I attach bulb light to prevent something bad happen if I miss components which are still bad.
The bulb didn’t lit and this proves all of components work good. You can see from led indicator shown “hold” and I can play it with several DVD cassettes. I clean the lens and lubricate disc tray to make sure no further problem.
I am very happy to see the smile on my friend face when I send it back to his home. Thanks God to keep me safe doing electronics repair. Please be careful when doing this work because it is really dangerous around main capacitor, always use safety goggles and isolation transformer. Thank you.
This article is contributed by Rudi Wijaya from North Sumatera Medan (Indonesia). He is an electronics repair hobbyist and specializes in TV, Monitor and DVD repair. He usually repairs the items that belong to friends and family.
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