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FSP350 blew a resistor

C

cgrant26

2[H]4U
Joined
Oct 23, 2003
Messages
3,416
FSP Group (Fortron Source) FSP350-60PN-R1 ATX12V

I went to get on my computer yesterday morning and saw the 3V and 5V systems had power but nothing else did. (USB ports had power and the CMOS LED on my NF7-S was lit) I pulled my FSP PSU apart and with a little investegating, I found a burned up resistor. On the PCB it was marked R32 (useless without a schematic) The labels on the resistor had been burned off so I can't tell what it's specs are. The resistor itself is quite large as resistors go. Its ~1" long and nearly 1/4" thick. It is cylindrical and has an orange ceramic core wrapped in a soft (plastic maybe) black shell. It was also mounted vertically to the PCB.
For shits and giggles, I soldered in a 5W .47 ohm resistor. Upon jumping the green and ground wires on the ATX connector, I got a click and no smoke (more than it had with the burned resistor, lol) So my question is does anyone have any idea what resistor this might be? I'm damn near broke right now and I really don't want to wait 2 weeks to buy a new PSU so repairing this one would be great. Any help/suggestions would be appreciated.
 
By solding on the wrong stuff and then proceeding to turn it on, you might have screwed yourself for being able to fix it now...I would buy a new PSU to be safe anyway. :rolleyes:

 
I don't have that model Fortron, and I couldn't find any large resistors close to 0.47 ohm in mine. But one 1-2W resistor was 20 ohms and the other around 470 ohms. In another PSU there's a 0.15 ohm 1-2W resistor the high voltage side, and I think it's used to regulate the voltage by measuring the current pulse by pulse (same regulator chip found in some Antecs).

How much does the heatshrink degrade the power rating of the resistor? I ask because it seems that some resistors are run close to their max.
 
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