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Im having a problem with my Panasonic crt tv model # ct-25g7f. When power button is pressed it turns on and then turns off by itself if pressed on occasion after a while it turns on and picture is good.What could be the prob here? I'm thinking it's the big filter caps in the cold side of the board. There is also a slight popping sound in the back when it eventually comes on.I inspected it and dusted the board off everything looks fine no burns or anything no bulges on caps either and no leaks or spills.

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My question on your problems;
Power button of your TV or Remote pwr button?
Anyway, 1. If TV power button - the culprit is in your power button switch, lose contact - defective. Replace with spare.
2. If you're referring to remote power button - It's a signed of 'COLD SOLDER' joint where galvanic action occur in every electronic terminal leads soldered by LEAD, (terminal lead material is copper & solder material is lead = Corrosion due to galvanic action), at POWER SUPPLY CKT section. How to check a cold solder joint - Remove power PCB to access the soldered components and look for discoloration on terminal lead tip, if you found one try to wiggle the component, say Capacitors, Transistor, Resistor or Transformer it will easily detached from solder.
3. Other technique - Remove back cover of your TV, switch on power button then try to wiggle big component like capacitor, resistor power transistor if cause by cold solder the tv will on & off locate and fix. Please refer to photos. Im having a problem with my Panasonic crt tv model - 25275605-g2bij12ihmeeyzuixp5ga03n-5-0.jpg 25275605-g2bij12ihmeeyzuixp5ga03n-5-2.jpg

Posted on Nov 13, 2014

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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. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Posted on Nov 09, 2014

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techman
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SOURCE: TV turns itself off after a few seconds, no picture at all

Sounds like the typical Flyback and shorted horizontal output transistor. Problem is the transformer is NO Longer Available

Posted on Sep 14, 2006

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SOURCE: Burnt smell after turned TV off. Now TV never turns on. See no burnt capacitor, resistors, etc.

dude, i believe that your flux capacitor is blown

Posted on Jun 03, 2007

MikeNJ1964
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SOURCE: WHY WONT IT COME ON?!?!?!?

If you would like us to help you, you must tell us what brand and model TV you have.

Posted on Aug 29, 2007

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SOURCE: power problem rca 32v434t

RCA 32V434T likely has a bad flyback--#271996. RCA 32F531T flyback no longer available,#262343 Fix one,dispose of other.

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SOURCE: panasonic tv ct-32hxc14j

try to reheat or resolder your tv.

Posted on Oct 23, 2007

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