Question about GE 25GT270 TV

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Shorts My 25GT270 tv just quit. Blown Fuse. replaced it, but blows as soon as you plug it in wall. Checked diodes(all good) and it shows no shorts in power connections. It also opened up the 2.7ohm ceramic resistor. I replaced it also but still blows fuse. Could it be in the HV circuit? Any help appreciated. Thanks

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Re: shorts

Could it be in the HV circuit? first you isolate h/output section from power supply. make power supply output ok. check h/output section for short circuit 1 print short near eht 2 diodes or cap.near eht 3 yoke H winding just by removing connector 4 EHT transformer regards

Posted on Sep 12, 2007

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If fuse blows off, the power supply regulator section circuit to your TV should be checked in detail. Check all the rectifier diodes first. Then check the main switching transistor for short. The work is a semi skilled one. For more information, check the link

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there is a standard procedure for proper replacement of blown fuse: CRT TVs: unplug degaussing coil, replace blown fuse with 2amp fuse and turn on the set. If it works, reconnect degaussing coil, replace the fuse with correct value(5-8) amp, depends on model(see fuse note next to holder). Enjoy the show! If in a process of replacing the blown fuse with 2amp w/o degaussing coil it blows again, forget about the next step. Set need repair. It could be an easy one, replacing 1 or 2 shorted diodes or bridge rectifier, but could be real piece of work if the power supply got "fried". If your knowledge won't go further, than fuse replacement, I'd recommend local TV repair shop.
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Jan 15, 2012 | Standard (CRT) Televisions

1 Answer

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2 Answers

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Jan 12, 2008 | Panasonic CT-32G11 32" TV

1 Answer

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No it doesn't sound like a resistor, it sounds like you have a short in power supply, you can look for bad Diodes in bridge rectifier,or solder bridge, or transistor short, start from beginning to end. It is definately a short and most of the time resistors open and this will not cause a blow just a dead set.

Sep 21, 2007 | Emerson EWF2703 27" TV

1 Answer

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If the fuse blows the instant the power is switched on, there is most likely a heavy short in the primary side of the power supply. This could be the rectifier diodes or the switching transistor (or IC). If you do not have experience identifying and replacing shorted semiconductors, allow a qualified tech to handle it for you.

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1 Answer

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you need to check the power supply area. usually when a fuse blows, that means the bridge rectifier is blown or the ic in the power supply area is blow too or both are blown.check there..good luck

Apr 04, 2007 | GE 13GP243 TV

1 Answer

Nothing works

The fact the set blows up the correct fuse is because it has a short ahead in the circuit,it could be one of the diodes(4) that is shorted,if one of these guys is bad all of them should be replaced with the exact replacement,ahead of them it should be a regulator and he is bad (shorted) it could have taken the diodes and the main fuse.The cause might have been a power surge.If you are familiar with tv service you can check the regulator and the diodes before you put in a new fuse,if you are not too familiar be safe and take the set for an estimate.If you suspect power surge or lighting damage it might not be worth repairing.Let Us know if you need more information.

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4 Answers

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This set uses a switching power supply. Usually when there is a short on the output side of the switching transformer the supply will just shut down and refuse to operate but normally will not blow a fuse. If the fuse blows suspect a problem with something shorted on the input side of the switching transformer such as I801 regulator IC, diode bridge D801,or other shorted component. Perhaps someone else could tell both of us any other part that could cause the regulator to blow and should also be replaced to prevent regulator failure in the future.

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