Problem with a small HiFi stereo system

[Bogdi]

I have this HiFi model AEG MC 4402 CD. The problem is with it's LCD screen. When I switch the device on the screen works fine. After 4-6 hours if I turn it off and on again the screen still light up but the black letters are not showing up. It's just the blue screen with nothing going on. If I leave it be, the next day It will work just fine for as long as it take to shut it down and turn it on again. I searched on google but the only results were the selling points of this model. Does anyone have an idea or a hint of what might cause that problem?

 

[BradtheRad]

Might be related to overheating, or power supply, or static charge. The unit operates for a few hours, while gradually deteriorating in some way. It's not so serious that it halts operation, however it will not start up again a few seconds after shutoff. You need to give it a day to cure itself.

The above is only a vague idea on my part.

- - - Updated - - -

See if you can earth ground the unit. There are simple projects for static charge detectors, using an fet.

Try putting it on a chill pad. There are store-bought types, or substitute ice cubes in a bag.

Do you have access to the power supply? Watch what the voltage does as you operate it for a few hours, and while shut off, and while turning it on, etc.

Also watch the voltage when a motor is running a cd, cassette, phonograph. If these are engaged when you turn it on, it might draw overmuch current from the power supply, causing a voltage drop, and disabling the unit from playing.