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C64 IN PET S' CASE

Because something will not work!

Remember, this is a development project...

It wasn't working when you decided to get a new PCB made, so it won't work now even if you have accurately copied your birds nest...

If you haven't accurately copied the original birds nest, you will have to fix these errors first...

I see a lot of desperation in all our futures I am afraid.

Dave
 
I am desperate now! I connected the new pcb but when i turn on the C64, fuse blown!!! :(
 
Replace the fuse and try again without the board connected then...

Is the board supplied from the same supply as the C64?

If so, how do you know it isn't a fault on your board? A bench power supply with a current limit would be a very useful tool, but I have already told you this before haven't I?

Dave
 
So the problem is almost certainly a short circuit on your board between +5V and GND isn't it.

Have you tried measuring with a multimeter fir a short?

Dave
 
Yes, in your video board.

With the video board on the bench (and nit connected to anything), measure the resistance between 5V and GND.

Dave
 
Well, measure the resistance from the +5V pin of JP1 to the +5V (VCC) pin of the ICs (look at the data sheets), and measure from the 0V pin of JP1 to the GND pin of the ICs (again, look on the data sheet).

I just looked at the PCB photograph and pin 1 of JP1 is 0V/GND and pin 4 is +5V.

This is a basic check you should have performed with a multimeter before connecting anything that you build to anything else.

Dave
 
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