Question about Standard (CRT) Televisions
Sir i would like to ask to how to fix this problem? before this tv is deadset and then i replace the ic voltage regulator the power is now is working and normal but when i turn on the tv after few mins goes off. i already check the voltage if normal and i found it is normal.sir give me some solution to this problem. thank you
SOURCE: Sony KV-32S40
When the horizontal output (2SC4927) is shorted it means one of 2 things is wrong - the horizontal drive transformer has cracked solder joints or the flyback transformer is shorted inside. If the solder joints on the horizontal drive transformer (the small grey transformer connected to the base of the horizontal output transistor) are cracked then the set will play for a little while and then the parts you just replaced will again be destroyed. ALWAYS resolder the driver transformer when replacing the parts you mentioned! When I replace the parts you mention and I do not see any obvious cracks on the driver transformer then I unsolder the B+ pin of the flyback (labeled 135, for 135 volts) and put a 60 to 100 watt lightbulb (drop-light) in series with the flyback. This means that the 135 volts B+ goes through the lightbulb and then into the flyback, so the lightbulb acts as a current limiter to protect the horizontal output. When you turn the set on the bulb should glow no more than about half bright and you should hear the high voltage come up, but you should not see a picture. If you turn the set on and the bulb glows as bright as if it was plugged into the wall then you can bet that flyback is shorted and must be replaced.
Posted on Jul 13, 2007
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
Hello bashlort, The increase in voltage may be to some circuit loading being removed this is a sign that something may have increased in resistance or something may have opened in the attached circuit. Have you taken any voltage measurements in the video section of the set, if not check the voltages on the pins of the video processor IC and follow the connections up to the CRT socket, be sure to pay special attention to the focus and screen grid voltages. If those are ok check the voltages in the horizontal section including oscilloscope measurements for drive signals. Please inform me of your findings. Thank you, Shuttle83
Posted on Oct 07, 2007
SOURCE: main power supply
If you changed the regulator and it still doesn't put out B+ you must have an open circuit somewhere. That model is known to have a 6.3 amp B+ fuse that opens and you must check it with an ohmmeter to tell if it's bad. replace it with a 7 amp fuse and you should be ok. If that doesn't solve it you may consider taking it to a shop. By the way, you're welcome for the tip. Two out of a hundred people said thanks for my time. Russmann
Posted on Dec 08, 2008
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