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MCB Tripping

Hello,

Just bought a Cooler Master GX 550 PSU & ASUS 7850 DC2 2GB Graphics Card. After installing all into chassis whenever trying to power it on the system MCB is tripping down and all the power supply is switching off. I have tried removing the Graphics card but the issue remains.One more thing this is not occurring every time, sometime all going well but some time going wrong.It can be PSU problem, but not sure.Any help??

System Specs:

Intel i5 3450 3.2 Ghz
Gigabyte B75 Motherboard
6 GB DDR3
Coolermaster 550 GX PSU
ASUS 7850 DC2 2GB
Coolermaster K380 Chassis.
13 answers Last reply Best Answer
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  1. Best answer
    What do you call "the system MCB"? If you refer to the circuit breaker in the distribution panel, then either the load on that circuit is too high (what else is on it), the breaker is getting weak because it has tripped too often or there is an issue with the PSU. Does it work fine when connected to a different circuit?
  2. Sorry for the typo error. The system and MCB should be apart from each other. And answer to your question that I haven't tried it in another circuit.
  3. Cooler Master is not well know for its PSUs, they make, however, excellent cases and CPU coolers! :)
  4. kingshuk_papa said:
    Sorry for the typo error. The system and MCB should be apart from each other. And answer to your question that I haven't tried it in another circuit.

    You'll have to in order to determine where the problem is. You should also identify what else is connected to the same circuit. Set the circuit breaker to OFF or make it trip and don't reset it. Then find another outlet that still has power and is therefore on a different circuit. If that breaker doesn't trip, then you know that something else is on the other circuit or the breaker no longer works properly. If both breakers trip, then RMA the PSU.
  5. Did you install the motherboard standoffs on the motherboard tray before you installed the motherboard or are there extra standoffs installed that don't match up with a mounting hole on the motherboard?
  6. check motherboard standoff's

    its quite likely power from cable/board etc is touching the case then being grounded and then tripping the psu because of this

    (when power flows through the earth it trips the rcd)
  7. Yes I did that. In fact the chassis is new so all the setup is brand new and also its started after installing PSU and GPU installed in new Coolermaster Chassis. There are no extra standoffs installed in motherboard. I have reassembled all the components including removing standoffs.
  8. will try it on different circuit.Lets see whats waiting for me. :(
  9. no there are no extra standoffs which are installed on the motherboard tray. :non:
  10. kingshuk_papa said:
    Yes I did that. In fact the chassis is new so all the setup is brand new and also its started after installing PSU and GPU installed in new Coolermaster Chassis. There are no extra standoffs installed in motherboard. I have reassembled all the components including removing standoffs.

    Your original post "
    Just bought a Cooler Master GX 550 PSU & ASUS 7850 DC2 2GB Graphics Card." lead me to believe that only these components were new. There are no extra standoffs, but the required ones all are installed, aren't they?
  11. Try this (often called PSU paperclip trick) :
    http://www.overclock.net/t/96712/how-to-jump-start-a-power-supply-psu-test-a-power-supply-and-components

    If the braker still goes to open mode, you have a faulty PSU, if not, you then reconnect 1 computer component then redo the test. Do it until is start tripping...
  12. Best answer selected by kingshuk_papa.
  13. GhislainG said:
    What do you call "the system MCB"? If you refer to the circuit breaker in the distribution panel, then either the load on that circuit is too high (what else is on it), the breaker is getting weak because it has tripped too often or there is an issue with the PSU. Does it work fine when connected to a different circuit?


    have changed my MCB from 6 amp to 10 amp. Its working fine now.Thanks for your help. :)
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