Question about Sharp 25R-S100 25" TV

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Repeated burn up horizontal transistor

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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  • solver gariz Jun 01, 2008

    how i get out of old technology,????dear BUBRUCE.

  • Anonymous Dec 06, 2008

    I have the same problem

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Yah get out of old technology.

Posted on May 31, 2008

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My tv made a little noise and then the picture disappeared. The screen is black with a vertical line of picture approx 1/4 inch wide going up the middle of the screen. Is it fixable?


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!

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My tv is blinking 7 times repeatedly. (The red standby light) What does this idicate and what can be tried before I take it to a repair store?


The blinking standby LED usually is an error code - indicating possible overcurrent protection mode. It can be either a short-circuit in the power supply, the HT rail, or the horizontal output transistor(s) could be shorted along with the flyback transformer. Or it could be a combination of all of the above.

Assuming this is a model with a CRT, I doubt it would be the 'bulb' - it would most likely be a circuit failure. Check the flyback transformer, the horizontal transistors and the tuning capacitors in their collector circuit - one may be shot.

Check the power supply and HT thoroughly for shorts and open circuit components - burn marks on the board, dry solder joints etc. Look for obvious things first.

Once you are satisfied that one or more parts have shorted, and you don't wish to replace them yourself, submit the TV to a repair store and insist on a FREE quote - this way, you can then decide if you want to pay that estimate to fix it or not.

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check your horizontal transistor maybe it's shorted replace horizontal transistor or maybe the fusible fuses are open check for open resistors at the horizontal section of the circuit.

Dec 22, 2010 | Sharp Standard (CRT) Televisions

1 Answer

My tv was on, the tv went black, the tv was making a soft semi rapid ticking sound, the tv was unplugged for 12 hours then plugged back in. The tv is making the same sound? Suggestions or solutions


The clicking is caused by the relay that supplies AC to the main power supply. It disconnects repeatedly because there is a fault on the output of the main supply or within the supply itself. If this action didn't happen, it could cause a fire or trip your household breaker. Since this is a CRT type set, I would be checking for a shorted horizontal output transistor or a failed fly-back transformer with which this transistor works to produce high voltage for the CRT and the signal that moves the sweep back and forth across the width of the screen.
The transistor replacement with labor wouldn't be terribly costly if done by an honest tech but if the fly-back transformer has failed, it may not be available any more and would in any case cost $60-100 US plus labor. These two parts will often fail nearly simultaneously as the result of one of them going first, then damaging the other.

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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.

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1 Answer

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1 Answer

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if the final flyback is ok ,then check the driver transistor and the voltage in his collector .Probably the flyback transformer is ok.please reply.

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1 Answer

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check the b+ supply of your flyback if they have check the horisontal transistor. check also if they have 5v supply in the system and 9v in the chroma ic or replace the memory ic.please reply.

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1 Answer

Repeated burn up horizontal transistor


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.

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1 Answer

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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.

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