Open Run DC Resistor Caused Power Supply Failure In DVD Player
MAKE AND MODEL: OKMC KM15 DVD PLAYER
PROBLEM REPORTED: Dead
PRELIMINARY INVESTIGATION DONE: Opened and cleaned the set thoroughly. DC supply was missing. Found 220K RUN DC resistor was open.
RECTIFICATION DONE: Replaced the resistor. Set got on. DC readings were ok. Played a CD and noticed that the working was not smooth. So, disconnected, discharged the tank capacitor and removed the SMPS Board. As there were a lot of dry solders, patched it up. ESRs of caps were ok. Removed the front panel and did dry solder patch up. Changed all the button switches, as they showed erratic readings when checked for continuity with Analogue Multimeter. Changed the strip wire of the Eye Unit as it was found strained and unclean. Cleaned the Eye Unit with IPA. Lubricated all the connectors. Reconnected the board and tried. It worked very well. After running several DVDs and MP3 CDs, a couple of them fully, fit the cover. The trying of DVD fully is an essential checking in DVD players, as the sliding motor might be erratic. I had already cleaned and lubricated the rails and the tray tracks with silicone grease. Mission accomplished and satisfaction got collected.
HERE ARE A FEW PICTURES:
This article was prepared for you by Parasuraman Subramanian from India. He is 70 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous repair article below:
https://jestineyong.com/burst-capacitor-found-in-suns-radio/
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Albert van Bemmelen
July 21, 2020 at 8:16 pm
Since you didn't mention whose dvd player it was, I suppose it was just a found by the road player that was thrown away by some previously owner you easily fixed?
Parasuraman S
July 21, 2020 at 11:05 pm
Ha! Ha! Nothing like that! It belonged to a regular customer. In order not to repeat such, as this can be easily assumed, I am cutting short. As far as we are concerned, when we get a defective device in front of us, charge ahead and repair it! Anyhow, I do appreciate the point!
Waleed Rishmawi
July 21, 2020 at 9:13 pm
Five stars repair job.
Parasuraman S
July 21, 2020 at 11:05 pm
Many thanks for your comments! It counts a lot!
Humberto
July 23, 2020 at 1:17 pm
Thanks for sharing your expertises. In my country a lot of people have DVD Players working yet.
Parasuraman S
July 23, 2020 at 3:38 pm
Many thanks! Yes, listening to DVDs is still a thrill, though not as good as Cassette or the long forgotten gramophone records, that too made from wax!
Raj
July 28, 2020 at 12:08 pm
Great Job.. thanks for sharing.
Parasuraman S
July 28, 2020 at 3:45 pm
Many thanks!