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820-3302 - Short on PP3v3_S5
- Thread starter gcain
- Start date
gcain
New member
No, I didn't put 11v on a 3v rail, that sentence was worded poorly.
Picked up a new PSU as the other is really old. This one beeps and cuts out at 0.5v as if I'm shorting the terminals.
Edit: Buying a new desktop Power Supply. Seems the ones I have access too are rubbish.
Will report back once it arrives.
Picked up a new PSU as the other is really old. This one beeps and cuts out at 0.5v as if I'm shorting the terminals.
Edit: Buying a new desktop Power Supply. Seems the ones I have access too are rubbish.
Will report back once it arrives.
Last edited:
Start injecting low voltage.
Read the current and put more voltage, maintaining current bellow power supply limit.
If your supply is 5A max, injecting directly 3-5V can get it bloked if that means more than 5A.
In such case, cheaper power supplies do not inject anything and also do not advise you that.
Maybe you get 5A at 2V only.
Then you cannot inject more voltage, as the suplly will be blocked for current limit; even if that rail accept until 5V.
Is better to use 10A limit power supply; this will allow you to inject more voltage.
Read the current and put more voltage, maintaining current bellow power supply limit.
If your supply is 5A max, injecting directly 3-5V can get it bloked if that means more than 5A.
In such case, cheaper power supplies do not inject anything and also do not advise you that.
Maybe you get 5A at 2V only.
Then you cannot inject more voltage, as the suplly will be blocked for current limit; even if that rail accept until 5V.
Is better to use 10A limit power supply; this will allow you to inject more voltage.
gcain
New member
Took y our advice and bought a 10A supply.
Found the short in under a minute.
So now I get a green LED and nothing else. Shorting SMC_ONOFF_L does not get the fan to spin.
Not being familiar with iMacs I don't know if I can turn it on with no screen, button etc attached; so should it be turning on when shorting SMC_ONOFF_L at C600?
Found the short in under a minute.
So now I get a green LED and nothing else. Shorting SMC_ONOFF_L does not get the fan to spin.
Not being familiar with iMacs I don't know if I can turn it on with no screen, button etc attached; so should it be turning on when shorting SMC_ONOFF_L at C600?
gcain
New member
C9480 was glowing when I put about 3amps through it at about 0.9 volts.
gcain
New member
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