Re: iMac 24 PSU LITEON PA-3241-02A1 250W
What type/brand caps did you use for replacements? (C214 & C215)
>>I've heated all capacitors with a hairdryer.. No effect, so i dont think a capacitor is defective.<<
--> Not a method to verify a capacitor. You need an ESR meter. <--
All the output caps need replaced. All are in parallel with at least one other so not possible to accurately tell which are failed. They all are from known problem series from United-Chemicon KZH & KZE in that manufacturing time frame. Multiple failures seen in my experience. Later versions are fine.
Qty - Value - Replace with (match sizes)
3 - 2200/16 - UCC KY
1 - 2200/16 - UCC KZH
2 - 470/50 - MAT FM
Inspect the chip side of the board for an burned/open resistor. Looking at 2x1mm and 3x2mm chip resistors, you'll need a jeweler's loupe and a good strong light.
With an LED glowing, apparently you have standby voltage. Review post 67 above and see if you can get this working while disconnected from the motherboard.
T
What type/brand caps did you use for replacements? (C214 & C215)
>>I've heated all capacitors with a hairdryer.. No effect, so i dont think a capacitor is defective.<<
--> Not a method to verify a capacitor. You need an ESR meter. <--
All the output caps need replaced. All are in parallel with at least one other so not possible to accurately tell which are failed. They all are from known problem series from United-Chemicon KZH & KZE in that manufacturing time frame. Multiple failures seen in my experience. Later versions are fine.
Qty - Value - Replace with (match sizes)
3 - 2200/16 - UCC KY
1 - 2200/16 - UCC KZH
2 - 470/50 - MAT FM
Inspect the chip side of the board for an burned/open resistor. Looking at 2x1mm and 3x2mm chip resistors, you'll need a jeweler's loupe and a good strong light.
With an LED glowing, apparently you have standby voltage. Review post 67 above and see if you can get this working while disconnected from the motherboard.
T
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