Dead Blizzard 1260?

[stachu100]

If you tested with different power supply units you can do following tests:
1) remove RAM and try to boot without HDD
2) measure 3,3V voltage on the center pin of voltage regulator
3) try to test on another A1200 motherboard
 
If no results and 3,3V is ok; well, you have broken turbo card :-(
You can send to someone for repair (I can do so but other persons on this Forum can do this job as well). But none will give you 100% guarantee that card will be fixed.
If IC's are not electrically damaged the chances that card can be repaired is about 95%
 
Cheers,
Stan

[stachu100]

You measured 3,29V which is 3,3V, so CPU voltage is ok....

[stachu100]

Don't forget that typical (cheap) voltmeters have +/-1% +/- 2 last digit tolerance ;-)

[stachu100]

4,98V is ok.
So check on another A1200
If black screen again; well :-(
As said if IC's on the board are not electrically damaged the card can be fixed.

[stachu100]

Well, as you said very difficult to quote repair cost without having card in hand.
What I can offer you is that I buy your card as "broken" and sell mine Blizzard 1260  060@80MHz (upgraded by me from Blizzard 1240) which is 100% ok.
By doing so you will avoid headache and risk that card can be "dead for good".

I'm afraid none will tell you cost of repair without seeing the card first.
If you think it's worth it please start new thread; maybe someone will be interested with repair.

[stachu100]

I understand you; silent is worth a lot of money :-)
No problem to downgrade to 50MHz; just oscillator needs to be replaced.
And as the CPU is 71E41J mask the heat generated @50MHz is very low, so you can close trapdoor with no risk of overheating.

The heat generated by 060 depends on mask version.
Early mask versions were quite hot and will not work above 55MHz, but they can operate @50MHz without additional cooling (some users said that trapdoor must be open to avoid random crashes during hot summer days).
Last 71E41J versions are proven to be cooler at the same clock speed comparing to first revision.
060 with latest mask can be overclocked up to 110MHz (I have 2 CPU's proven to work @106MHz by myself).