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Oh! No. Not again. PSU is busted

Power Supplies - AnandTech Forums - forums.anandtech.com
HI

I invested $1200 till now on my new assembled desktop computer. It is been just 3 weeks since I got this computer. I have a very agonizing problem with the PSU in my computer which is a CoolerMaster thunder 500W. Model - RS-500-ACAB-M3

one week after I purchased the computer, the PC started giving me restart problem. When the main power goes off, the power source switches to UPS . While UPS is giving the power, if the main power is restored, the PC restarted. After some analysis, I felt that it could be the SMPS problem and took it to the vendor who sold the PC. He opened the PC and found some thick liquid that has fallen off from the SMPS. He told me that the capacitor in the SMPS busted due to voltage fluctuation. He initially told me that he has no business in replacing the SMPS as this is a problem with voltage fluctuation in my home and I need to go to cooler master service center. However, as the PC is just two weeks since it was built, he decided to give me a new SMPS of the same make and model and told me that he was not sure if cooler master would take the damaged SMPS and compensate him. He told me that if the problem repeats, I need to go to the cooler master service center. I argued that the capacitor in SMPS could be faulty. The reason I said this is on the UPS it is clearly written that the UPS has a AVR of 135-300 volts. So UPS will correct the voltage before giving to SMPS. He said the UPS is just a power back up and does not do any AVR. The UPS is a Microtek UPS 1000 VA twin guard plus.

I came back home with my PC. As the vendor told me that there is voltage fluctuation, I decided to check what is happening in my home with voltage before connected the PC again. My father checked the voltage in the socket with a multimeter and it was showing the voltage output from the socket in between 240 - 250 Volts. On the SMPS, it is written that the input voltage is 230 volts.

At this stage, I felt that a stabilizer would be required to regulate the voltage as I heard people saying that microtek UPS I am using does not do voltage correction. I got a voltage stabilizer. I connected voltage stabilizer to UPS and UPS to PC. We checked the stabilizer input and output. It is taking the input of 242/3 volts from the main socket and giving out the same amount of voltage 242/3 as output. We tried with two stabilzers of different makes. Both where doing the same thing when I was expecting them to give a steady output of 230 volts. The stabilizer is a 3 AMPS capacity with voltage correction range between 170 - 270 volts and voltage output between 200- 240 volts. Not sure to connect the PC or not. I called up cooler master support and the guy told me that it is safe to connect the PC and the intelligent chip inside the SMPS would give 230 volts of steady power and discard any additional power. With that assurance, I powered on the PC

Today I switched on the PC and forgot to shut it down and went away.The power went off for 3 hrs and I thought the UPS would have drained and PC would have been shut down. When I came back, the PC was in hibernation. Thought the UPS battery would have drained and because of low power windows might have put it on hibernation.

I woke up the PC and it came out of hibernation and the restart problem is back hitting me very hard. I immediately shutdown the PC and removed the case and found the same liquid leaked from SMPS.

Please help me . I feel dejected. I can't use this PC anymore.

Regards

Srinivas
Date: Feb 25, 2015   


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