Electronics > Repair
PLD getting hot
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fzabkar:

--- Quote from: kraka on September 26, 2024, 09:57:35 pm ---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 ?
--- End quote ---

I mean for you to desolder the Vout pin of the 5V regulator and then measure it. If it sits at 5V, then the regulator is probably OK. If it is much higher than 5V, then a failure in the regulator (unlikely) could be the reason for the failure of the PLD.
kraka:

--- Quote from: fzabkar on September 26, 2024, 10:26:53 pm ---
--- Quote from: kraka on September 26, 2024, 09:57:35 pm ---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 ?
--- End quote ---

I mean for you to desolder the Vout pin of the 5V regulator and then measure it. If it sits at 5V, then the regulator is probably OK. If it is much higher than 5V, then a failure in the regulator (unlikely) could be the reason for the failure of the PLD.

--- End quote ---

I wish with all my heart, the failure to be on the regulator. It is little hard to de-solder only one pin. It is the DPAK-3 DT SUFFIX CASE 369C. This legs are short and hard and difficult to bend. I can, completely, de-solder it to measure it, or it does not need to measure it. If the PLD will not get hot, when +5 is out of the Card, then...
What is your opinion ?
fzabkar:
The PLD is obviously bad. I'm just curious about the regulator.
kraka:

--- Quote from: fzabkar on September 26, 2024, 11:15:13 pm ---The PLD is obviously bad. I'm just curious about the regulator.

--- End quote ---

+5 de-soldered from the Card.
It gives 3.78V output, when injected 12V in input.
To give 5V, must inject 15V

ALTERA, continuous warming up, in the absence of the regulator.
fzabkar:
It looks like there is something wrong with the 5V regulator. Is it getting hot?

The Altera device must be getting power from somewhere else. I think you need to investigate the power pins of the ICs in order to determine how they are powered.
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