Hi guys, I am experiencing the same weird problems too with my thermistors what gives?
Here is how it all started: I got the brand new PSU(Approx 650W "App650PS") about 3 weeks ago without guarantee because it's a replacement for another malfunctioning psu(Cooler Master 600W) that lasted for about 2 years.
A few nights back I was gaming, enjoying my new PSU and "BAM" the PC turns off without any warning. I try to turn it on and it won't start but the Mobo light is lit "green". Decided to pull the plug and let everything cool for an hour or so.
After the 1hr wait I plugged the extension cord back in the wall socket and tried to turn on my PC. At this point all I heard was a pop in the PSU and the lights in the whole house went. It tripped the breaker for the whole house.
After opening the PSU it up(no warranty so why not ) I noticed the fuse(5x20mm 6.3A) inside had blown,went quickly to the store and got 3 replacements just in-case. Put in the replacement and "BAM" it blows the second fuse together tripping the breaker for the whole house
Googled around and found some usual culprits that might be causing the issue. Since i'm kinda cash strapped and don't want to wait for a cheap multimeter from AliBaba(which could take weeks) I decided to replace some parts for the PSU which I thought may be defective. (All this without using a multimeter).
I first started by replacing the crappy Chinese bridge rectifier(KBP 307 3A) https://cdn.badcaps-static.com/pdfs/...ce07994762.pdf
to a better Diotec brand with higher ratings(KBU8K 8A)
Soldered it on and "BAM" still the same problem, blown fuse + tripped house breaker circuit.
Next I decided to change the filter cap from a cheap (HQX 334 250V - 275V X2)275VAC0.33UF 275V334K X2 to (.47uF 275V X2)
Soldered it on and "BAM" still the same problem, blown fuse but this time it blew out an NTC thermistor too (MF72-5D11 5 Ohms 4A)(Blew it to pieces) with a loud bang + tripped house breaker circuit.
Went to the store again(became a regular idiot by now) and got a replacement with higher ratings (4.7 Ohms 5.1A)
Soldered it on and "BAM" still the same problem, blown fuse but this time it blew out the other NTC thermistor next to the one I replaced, it is also a (MF72-5D11 5 Ohms 4A)(Blew it to pieces too) with a loud bang + tripped house breaker circuit.
What could be the cause of this ? I would appreciate any help you guys could provide to guide me in the right direction, I still can't test any component because I don't have a multimeter or anything similar.
So far I have not been able to find the psu's schematic anywhere, I have a few diodes(higher ratings) and resistors that I can replace, is it worth a try to replace the one's on the pcb?
Here is how it all started: I got the brand new PSU(Approx 650W "App650PS") about 3 weeks ago without guarantee because it's a replacement for another malfunctioning psu(Cooler Master 600W) that lasted for about 2 years.
A few nights back I was gaming, enjoying my new PSU and "BAM" the PC turns off without any warning. I try to turn it on and it won't start but the Mobo light is lit "green". Decided to pull the plug and let everything cool for an hour or so.
After the 1hr wait I plugged the extension cord back in the wall socket and tried to turn on my PC. At this point all I heard was a pop in the PSU and the lights in the whole house went. It tripped the breaker for the whole house.
After opening the PSU it up(no warranty so why not ) I noticed the fuse(5x20mm 6.3A) inside had blown,went quickly to the store and got 3 replacements just in-case. Put in the replacement and "BAM" it blows the second fuse together tripping the breaker for the whole house
Googled around and found some usual culprits that might be causing the issue. Since i'm kinda cash strapped and don't want to wait for a cheap multimeter from AliBaba(which could take weeks) I decided to replace some parts for the PSU which I thought may be defective. (All this without using a multimeter).
I first started by replacing the crappy Chinese bridge rectifier(KBP 307 3A) https://cdn.badcaps-static.com/pdfs/...ce07994762.pdf
to a better Diotec brand with higher ratings(KBU8K 8A)
Soldered it on and "BAM" still the same problem, blown fuse + tripped house breaker circuit.
Next I decided to change the filter cap from a cheap (HQX 334 250V - 275V X2)275VAC0.33UF 275V334K X2 to (.47uF 275V X2)
Soldered it on and "BAM" still the same problem, blown fuse but this time it blew out an NTC thermistor too (MF72-5D11 5 Ohms 4A)(Blew it to pieces) with a loud bang + tripped house breaker circuit.
Went to the store again(became a regular idiot by now) and got a replacement with higher ratings (4.7 Ohms 5.1A)
Soldered it on and "BAM" still the same problem, blown fuse but this time it blew out the other NTC thermistor next to the one I replaced, it is also a (MF72-5D11 5 Ohms 4A)(Blew it to pieces too) with a loud bang + tripped house breaker circuit.
What could be the cause of this ? I would appreciate any help you guys could provide to guide me in the right direction, I still can't test any component because I don't have a multimeter or anything similar.
So far I have not been able to find the psu's schematic anywhere, I have a few diodes(higher ratings) and resistors that I can replace, is it worth a try to replace the one's on the pcb?
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