Question about JVC Televison & Video
I almost change all parts in primary and secondary but still no power ,,then after i disconnect secondary low voltages the b+ went out but if i solder again the b+, no more power at all
There should be a short circuit at its +B side. Just disconnect all the load from the +B, connect a 100W 220V filament type bulb [Not CFL or other type], as load, and switch the set ON. If power supply is OK, the bulb should glow with half its intensity.
If it does so, check the horizontal scan output transistor, which drive the LOT (Will be screwed to a metal heat sink), for any short. De-solder it out from the circuit, and switch ON the set, after connecting the +B voltage; and now measure the +B voltage. If it is found OK now, be sure that the horizontal output drive transistor is leaky, should be replaced. To get more details, http://electronicshelponline.blogspot.com/ If you wish to get further assistance from me, come over by Fixya comment. OK. Good Luck.
Posted on Nov 28, 2013
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Posted on Jan 02, 2017
SOURCE: JVC TV- MODEL AV-K21T.
it was not necessry to replace so many parts if you go as per proper procedure.please proceed as 1 isolate horizontal output section from power supply & make power supply ok. 2 if it becomes ok check hor osc,driver&h/output section. 3 if it is ok connect power input to hor.section which was isolated. 4 check for loose contact or print. 5 put on tv .
Posted on Sep 22, 2007
SOURCE: jvc will not power up
Not, just install soldering stations on the terminal capacitor ( bottom) and pull up slow, clean solder and put it back new one. See position ( -- And + )
C926 and C928 1000uf 35v Common problems.
Some time D905 shorted
Replaced C911 470 uf 35V
Posted on May 11, 2008
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