Atari 520st video issue

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I just bought a 520st (one of the models with Video Modulator).

I hooked it up to a TV via RF cable and got a screen that looks like the attached image

I also hooked up pin 2 and 13 via an RCA and got a similar image.

 

What are the chances that the un-modulated output will work (to a VGA monitor that can support 15khz). I do have a Dell 2001fp that should work, I would just need to invest about $40 in a cable.

 

Any ideas what might be wrong with my 520st?

 

 

[tjlazer]

You need to perform the "universal 4 inch Atari drop", otherwise known as opening it up in reseating all socket it chips!

[[email protected]]

Thanks

 

You need to perform the "universal 4 inch Atari drop", otherwise known as opening it up in reseating all socket it chips!

Thanks. Do you typically use a "chip puller" tool to reseat chips?

[x=usr(1536)]

Thanks

 

Thanks. Do you typically use a "chip puller" tool to reseat chips?

 

You can... Or you can carefully pop them out with a small screwdriver or similar. Automotive fuse pullers may also work depending on the ICs involved.

 

Sometimes just opening it up, pushing down on them with your thumb without removing them, and seeing what happens is all that may be required.

[tjlazer]

Chip puller or a small screwdriver carefully propping up each side of chip a little bit just enough to push it back and should do the job, no need to remove the chip completely.