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 screen.so 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...
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Re: tv screen shrinks
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
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Re: tv screen shrinks
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.
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That is not a light bulb. That is a Cathode Ray tube. You are leaking tube coolant and that means the seals on all 3 cathode ray tubes are going bad. This is something that can be repaired but you need a qualified tech to do so or the TV can be easily ruined.
Have a Mitsubishi 65 rear projection menu keeps fading on and off, any ideas of the problem. Bulb just replaced 2 months ago, no problems with bulb. Also a DVD works fine, but tv picture will not come on.
This is a common problem on certain models of Philips Magnavox TV sets. The most common symptom is the screen will shrink and expand over and over. After the TV heats up for a while the video will work like normal. After a few weeks or months your TV will eventually stop working and not have video. You can get complete parts and instructions from www.TvRepairKits.com
old tvs CRTs ( cathode ray tubes) pick up signal better than LCDs
So yes good quality satellite cable with better screening and low loss cable will be better, plus a new aeriel may do the trick.
Is your tuner in new LCD faulty though,? try it on your friends tv where you know the signal is fine.
I realized that there is a 90 day warrantee on parts and a 30 day limited warrantee on labor for the repairs that were done. As I stated, the original problem was the picture shrinking after a few minutes of the set being on. The repair firm took my control board with them. When they came back to install the repaired control board in my set there was a load spark during the installation, after which I had a black screen and no sound. The repair firm took my set them and installed a "CAP Kit", a STRM6511, and a "D1881". The set worked perfectly until two days ago.
I called the repair firm an they are coming out this Thursday to check out my TV. I am hoping the problem is related to the failure of one of the parts installed to fix a similar problem which occurred after the sparking incident.
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.