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.
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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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