Atari STE v1 BOOSTER ic2 burned

[valfac]

Do you says in the cpu clock signal line of mainboard?

What do you get on the resistor above the CPU ?

[exxos]

Do you says in the cpu clock signal line of mainboard?

R5 on the booster.

[valfac]

No signal. Flat..

Do you says in the cpu clock signal line of mainboard?

R5 on the booster.

[exxos]

So IC2 has failed again ?

PM your address and I will send you a different booster to try (and you return the first one for me to diagnose if it fixes the problem) . I don't know any reason why that would fail. Even so they are all tested for some hours before they are put into my store.

[valfac]

It seems so but this time it has not burned.

I am concerned that my Atari has no video on the way out, there is no black screen.

Is it possible that something else is damaged?

What Can I do to test the GLUE, MMU, Video is not damaged? I have a poor knowledge of Atari hardware.

I'm going to sweat blood to desolder the Booster, the ground pins are a hell :)

Can I desolder the Booster by upper face? I think it is more easy

Thanks a lot

[exxos]

ST's are normally in a really bad shape with black screen, you likely get a white screen? which is good...

If you desolder from the top then it may get damaged , and if there is a problem with the booster, I need to be able to retest it.

I can only suggest you contact @Steve who can give your machine a test and service, as he is in the UK ( I don't know if you are) he can get parts easily from me as I am also in the UK.

Alternatively, get a different STE motherboard as we don't know if something on your board is killing the booster or not either.

[valfac]

I dont get any color screen, my monitor LCD goes to sleep mode(no video signal detected)

Well, I will desolder from the down side.

Im from Spain... My best option if the mainboard is faulty and I dont find the fail is purchase anothe one.

Thanks!

ST's are normally in a really bad shape with black screen, you likely get a white screen? which is good...

If you desolder from the top then it may get damaged , and if there is a problem with the booster, I need to be able to retest it.

I can only suggest you contact @Steve who can give your machine a test and service, as he is in the UK ( I don't know if you are) he can get parts easily from me as I am also in the UK.

Alternatively, get a different STE motherboard as we don't know if something on your board is killing the booster or not either.

[valfac]

Hello People!

I have news:

Yesterday I did more tests, and I found two faults, the IC2 is damaged, and the mc68000 too :shock: , maybe a voltage spike from the power source damages the 68000 and the same time the IC2.

But I just change ic2 and probably the mc68000 caused ic2 to get damaged again

The thing is that today I changed the mc68000 (Luckily I bought one for spare), and once again the IC2:





And now I have clock signal in the out of IC2:



I power on the Atari and TOS is booting now:



But when I enable the Blitter:



TOS system crashes :cry:

Some help is welcome...

[exxos]

Internal blitter machine needs mods to booster...

https://www.exxosforum.co.uk/forum/viewt ... =20#p41514

[exxos]

You also have Parity RAM in there 9 chips ? So you need to remove the Parity chip.