Yet Another Single Diode Failure Found In HAIER LED TV
This Haier LED TV model LE22B600 belonged to the hospital I work and was brought to me in a dead condition. I opened and cleaned the inside before looking for the trouble maker. The following picture is taken before cleaning up:
Fuse was intact. Could not find any burnt components in primary and secondary. ESRs of caps were ok. When I powered the TV and checked the output voltage, it was found dropped. That meant the primary switching was ok and something had gone wrong in the secondary. As I found two diodes connected in parallel in the secondary section and was sure that one of them might have got shorted, I checked and found it to be true. Removed both the diodes and checked it again.
One was ok, but one was short! Following pictures are the shorted diode checked in forward and reverse condition:
I replaced both the diodes and applied power and was glad to see the TV working:
Applied signal and found a crystal clear picture on the screen.
After allowing it to run for a couple of hours, fixed the back cover and run it again for a few hours:
As the on screen menu was in an unknown language, I took my techie friend’s help to change it to English:
Mission accomplished and satisfaction got added to its collection.
This article was prepared for you by Parasuraman Subramanian from India. He is 72 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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