Electronics > Repair
PLD getting hot
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kraka:
Unfortunately, i think this is the end.
I am very sad.

Just a moment ago VT244 was de-soldered and removed, then the card was connected into the motherboard and booted into Windows. The ALTERA immediately got very hot, and by "hot" i mean i cannot hold my finger on it more than two seconds.

I guess it is useless to replace the +5 Volt Regulator that instead of 5Volts, gives 3.88.

Why cannot replace ALTERA ? I do not want to steal anybodies copyright. I just want to replace it, to buy it, for fixing the Card that i have bought.
I just wanted to write music...
fenugrec:

--- Quote from: kraka on September 26, 2024, 12:20:59 pm ---When i am saying injecting Volts to the Card, i mean this :

--- End quote ---

Where did you get the idea to do that ?? That is an excellent way to cause irreparable damage. There is rarely a need to supply power directly to a board, (especially 12V !?), on random pins, especially if you don't really know what you're doing. Until you know *exactly* why and how to do it, I suggest you don't try that again.

If I understand correctly and you applied 12V to the 5V rail, you probably killed almost everything digital on that poor board. Sorry for the bad news.
fzabkar:

--- Quote from: fenugrec on September 26, 2024, 05:32:45 pm ---If I understand correctly and you applied 12V to the 5V rail, ...
--- End quote ---

The OP measured the correct voltages at the outputs of each VR, so that would imply that the correct voltages were applied to the inputs (+/-12V).

The low output voltage from the 5V regulator could be due to overloading by the Altera PLD. It would be interesting to see where the +5V rail sits when it is disconnected from its loads.
kraka:

--- Quote from: fenugrec on September 26, 2024, 05:32:45 pm ---
--- Quote from: kraka on September 26, 2024, 12:20:59 pm ---When i am saying injecting Volts to the Card, i mean this :

--- End quote ---

Where did you get the idea to do that ?? That is an excellent way to cause irreparable damage. There is rarely a need to supply power directly to a board, (especially 12V !?), on random pins, especially if you don't really know what you're doing. Until you know *exactly* why and how to do it, I suggest you don't try that again.

If I understand correctly and you applied 12V to the 5V rail, you probably killed almost everything digital on that poor board. Sorry for the bad news.

--- End quote ---

 Thanks for your sympathy.
About applied 12V, it is not exactly what i said. What i described in my previous post about "what i mean about injecting...." was to describe how i diagnose the input and output Voltages to the four Voltage Regulators that exists on my Card, answering @fzabkar, who wondering about the output voltages at VR1 - VR5. This made with no mistakes. By the way the only strange result was the +5 output that was 3.88Volt instead 4.8 - 5.2.

 But... as i described in my first post, initially and after 1 and more year made everything i could to make this Card give me a little sound, i decide, because i had (or i could not do) nothing more to do, to give 12 volts to the card, to see if anything would warm up. But i made a mistake :
 Pin 2 on side A of the card is responsible for accepting 12Volts and this pin is the second closest to the backplate. I accidentally connected the supply to the 2nd pin on side A, but counting from the farthest, to backplate side, where there was pin 57, which has the AD label in green color and description: "Address / data bus (bottom half)" and "Signal I / O.    Maybe driven by starter or target, depending on the function".
 I, still, don't know what that pin is. Anybody knows? 
kraka:

--- Quote from: fzabkar on September 26, 2024, 08:50:11 pm ---
--- Quote from: fenugrec on September 26, 2024, 05:32:45 pm ---If I understand correctly and you applied 12V to the 5V rail, ...
--- End quote ---

The OP measured the correct voltages at the outputs of each VR, so that would imply that the correct voltages were applied to the inputs (+/-12V).

The low output voltage from the 5V regulator could be due to overloading by the Altera PLD. It would be interesting to see where the +5V rail sits when it is disconnected from its loads.

--- End quote ---

Sorry, but i do not get it. What do you mean by : "where the +5V rail sits when it is disconnected from its loads."

Can you explain with details so for me to understand and do something to see ?
Do you mean to de-solder the +5V Regulator ?
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