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lucifershalo

My CV goes to a black screen after some minutes

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Hello, got a new problem just now

after some min of play (3-4) it went to a black screen and I have to switch it off and back on to make it work but the problem remains,

 

any idea what it could be,

 

it is refurbished, improved console by Yurkie

 

thanks

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Interesting. I've exactly same problem in one of my consoles. I'm going to try to solve it in some weeks.

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Does the rest of the system seem to continue when the screen goes black? (gameplay, sound, etc)?

 

Is the heat sink still firmly attached to the video chip?

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Posted (edited)

Can I assume you also tried reset, to no avail?

 

Do you have the capability and equipment to test internal connections?

 

The first thing to check is power. If you're really careful, you can check the voltages from the expansion port. The bottom leftmost pins are -5V, +5V, and +12V. The wide pin on the top left is the ground pin. Just don't short a power pin to the copper springy guides or to another pin. Stick a post-it note or something on the guide to insulate it.

 

If the power is good, the problem is likely to be in the oscillator circuit. Possible failure points include the crystal itself (sometimes they can quit oscillating until spiked again, say, by turning the system off and back on), U22 (two logic gates that the oscillator uses), U8 (the clock divider) and Q2 (apparently a clock amplifier).

Edited by ChildOfCv

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