Question about Standard (CRT) Televisions

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Intermittent loss of picture and sound

Intermittently the picture and sound both go away as if the TV were turned off. When this happens, the TV can be turned off and on from both the remote and the front panel (you can hear the click), but this does not clear the condition. The reset button will not clear this condition either, but it will power off the TV if it is on like it's supposed to.

After a few minutes, the TV can be powered on and will work normally for up to an hour.

Sure sounds like a heat-sensitive component to me. Any hints on where to look?

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Re: Intermittent loss of picture and sound

Please fully read all I have written.

Im not at all familiar with you tv set as its a US model & im in the UK .
But your problem is common with all makes chances are you have an electrolytic capacitor which is at fault or transistor or diode.
If you are confident & have some knowledge of electrical circuits you may be able to track it down.

First thing to do is just take a good look at the tv circuit board look for any any caps that are bulging or are discoloured chances are they will be faulty and need replacing.

PlEASE BE AWARE the large cap in the power supply (psu) can hold a charge around 350 to 400 volts even when it has been switched off for days.

If you cant see any suspect caps the next step is to purchase a can of freezer from any decent electrical component shop.

The next step involves working on the set with it running WARNING DO NOT DO THIS UNLESS YOU KNOW EXACTLY WHAT YOU ARE DOING.............

Run set untill fault appears once set has gone faulty spray one or two caps diodes & transistors in psu untill they have a slight frost on them switch set on again if it starts up wait a while then lightly spray components again if set runs good providing you keep spraying then you know the faulty area.

Next step involves getting the fault to component level, Run set again now only spray 3 or 4 components try not to get any spray anwhere else.
If set goes off you are not on the faulty parts so spray a different group parts,
Repeat this untill you have got it down to 3 or 4 component that are the culprets.
Now just spray one until you get it down to a single component.
Replace this part & hopefully you cracked it.



Posted on Dec 26, 2007

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