I have a D5002 bridge rectifier in a power supply on a 04' Sony RPTV Im working on that is supposed to produce +22v and -22v and on the -22v side I am getting about double the voltage (45.1v) and I have a 5A pico fuse that keeps blowing. I am replacing convergence IC's, and the 5a fuse is part of the -22v IC circuit. The +22v circuit is fine. Any ideas?
A Zener diode has a brake down voltage that is very precision and they are generally low wattage devices. Varistors are also designed to brake down at a certain voltage but they are high wattage devices designed to short out and blow your fuse in the event of a power spike. Aside from having a higher wattage than zener diodes I don't know if they make any varistors that are as precision as zener diodes. I have seen many TVs come in my shop where the varistors failed to protect.
I have a D5002 bridge rectifier in a power supply on a 04' Sony RPTV Im working on that is supposed to produce +22v and -22v and on the -22v side I am getting about double the voltage (45.1v) and I have a 5A pico fuse that keeps blowing. I am replacing convergence IC's, and the 5a fuse is part of the -22v IC circuit. The +22v circuit is fine. Any ideas?
theciskokidd 5 months ago
@theciskokidd I find your descriptions hard to follow but it sounds as though your measuring from the wrong ground.
GrantsPassTVRepairs 5 months ago
thanks a lot pal, a very clear explainations. regards
yononable 1 year ago
@MrAnimeGuru
A Zener diode has a brake down voltage that is very precision and they are generally low wattage devices. Varistors are also designed to brake down at a certain voltage but they are high wattage devices designed to short out and blow your fuse in the event of a power spike. Aside from having a higher wattage than zener diodes I don't know if they make any varistors that are as precision as zener diodes. I have seen many TVs come in my shop where the varistors failed to protect.
GrantsPassTVRepairs 1 year ago
Really enjoy your videos.Many Thanks for the instruction.
Cliff W8WHO
W8WHO 1 year ago
@W8WHO Thanks for letting me know. 73s
GrantsPassTVRepairs 1 year ago