Question about JVC AV-27530 27" TV

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Tv screen shrinks

I have this tv, which is mitsubishi make and a cathode ray tv. it has been working fine,but since 1 month ago the tv does a wierd thing. once u switch it on,its fine but after like 2mts the tv screen display shrinks to the centre of the all u see is a 10cm wide line of display stretching through the centre of the screen. How can i fix this my self.please help... Please email me at

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  • ric des Jun 20, 2007

    Hi Pravin,thanks for the reply.where abouts in the circuit would i find the capacitors in the Vertical stages.And I have read before opening up a tv casing is a bit dangerous due to high voltage. is it really that dangerous even if i haven't connected the power or to get to the circuit board would i have to risk any danger?please..i really want to do this just need some help where exactly to find the capacitors on the circuit board.



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The first solution is correct , but there are a few missing facts, in order do do the repair correctly you must replace the vertical output ic (TA8427k) and all the capacitors that surround the heat sink and the vertical ouput IC. be sure to coat the heat sink with heat sink compound.Also the current limiting resistor off the IHVT sometimes opens or changes value. If you do all these thing and upgrade the capacitors from 85 Degrees cent to 105 centigrade., the problem will not raise its ugly head again. Also due to the poor Q>C of replacement parts , it might be nec. to go into the servicemans menu to re-align linearity and center. Scrivitron

Posted on Jun 21, 2007

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Looks like some of the Electrolytic Capacitors in the Vertical Output stages have dried out and need to be replaced. If you are conversant with Solid State electronics servicing, then you can make an attempt. I generally do not waste time identifying the faulty capacitor, but replace the entire lot in thre Vertical stages. There are not more than 8-10 of them. Since you are changing them en masse, should not take you more than 30 - 45 mins to desolder the suspect ones, and solder the new ones. And it also saves you the bother of new problems cropping up in the near future, as all potential problems with old capacitors get removed.

Posted on Jun 20, 2007

  • Pravin Gupta Jun 21, 2007

    Check the Capacitors around a small vertical standing 7 pin IC LA 7832. Also check a particular diode D422. It is a zener diode.



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