Sharp #25r_s100 25" tv i try to repairing. problem was tv repeated burn up horizontal transistor & making noise from transformer in power supply when i replace back same # horizontal transistor.anyone could help me to solve this problem? i wish! thanks
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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site.
Generally this is not good news. Even in the event this TV is repaired, it will work very long. This TV has a horizontal problem. This is the most stressed area of any conventional TV. The Horizontal Output Transistor will need replace, the flyback transformer is bad, you have bad power supply with horizontal capacitors that are bad, and last, is a possible bad picture tube. This TV is not worth the effort or money to repair. Thanks for asking and show all hands of support!
If the horizontal transistor getting shorted, this could happen. Check the transistor 2 SD1398. If found faulty replace it. But replace black colored doides in the circuit as a whole. Leaky diodes can not be determined easily with the multi meter. Especialy the small high voltage diode near the small transformer connected to the 2 SD1368 transistor.
The set has a shorted horizontal output transistor and possibly a bad high voltage transformer. The transistor can be checked with a DVM but the transformer has to have its impedance checked with a "ringer". Also solder all stages in the drive circuit of the horizontal transistor. The power supply is making the noises because of the short on the secondary side. Thanks for using fixya.
sounds like you might have an auto overvoltage shutdown circuit kicking in. The hivoltage goes to high and the monitoring circuit auto shuts down. More than likely trouble is in hivoltage circuitry. If you have a transformer that will allow you to bring up the set slowly without shutting down and you can look to see what's happening.
Sorry if that sounded kind of kurt. All that i ment is that the price of repeadly fixing an older tube tv may start to outweigh the price of a new flat panel tv. Also samsung (if you like that brand) is still making high definition slim fit tube tv's. Which is an older technology driven tv with new bells and wistles. Also sony's XBR line is an absolutely fantastic tv. When tube tv's were being mas produced sony came up with the XBR line and have been using it ever since. If you can find an XBR series tube tv for a reasonable price you can bet on the fact that it will be a phoneminal tv without spending the mass amounts of money on a flat panel. But as for the repeated burn up of your transistor i cant be of much help. And if thats all you care about doing is fixing the tv you already have well then i just wasted a few min. of your life. I wish i could be of more help on this.
The F27669 uses the CTC203 series chassis. The most common cause of that symptom is a shorted horizontal output transistor, caused by a cracked solder joint on a small coil connected to that transistor's base. When this happens, the main B+ supply is shorted to ground so the power supply squeels. Every once in a while I also see the horizontal output transistor shorted due to a shorted flyback (high voltage) transformer. A good tech will replace the horizontal output transistor, resolder the coil and drive transformer, test the flyback (replacing it if necessary) and your set will be back to perfect.