Results 1 to 7 of 7

Thread: Repairing a Corsair HX 650 Bronze

  1. #1
    Join Date
    Jun 2010
    Location
    The Netherlands
    Posts
    5,380
    Thanks Thanks Given 
    381
    Thanks Thanks Received 
    116
    Thanked in
    89 Posts

    Default Repairing a Corsair HX 650 Bronze

    So I got my hands on a some defective power supplies. The first one is a Corsair HX 650 Bronze, based on the old Seasonic SS-xxx-HM design (M12 series). PCB marking says Apr. 18 2006, guess that's not the day this Corsair is build.

    The problem with this unit is the burned thermistor, and because of that the fuse was also blown. Replacing the fuse wasn't a problem of course, but the thermistor was totally burned, so I don't have a clue which type it was. PCB says TR301, but I don't have Corsair/Seasonic's component list, so I don't have a clue.

    What I did found is that i'm not the first with a burned thermistor.
    https://www.google.nl/search?hl=en&q=tr301+corsair

    Other "funny" thing I found about this PSU. It doesn't have a real secondary protection IC for OCP, SCP and OTP, there is only a simple HY510N. Guess the reason can be found in Jonny's review from the Seasonic M12 700W. But imo that could/should have been changed for the HX650. The HX650 came about 3 years later then the HX620 and Seasonic SS-xxx-HM (M12 series).

    But back to the million dollar question, who can tell me the specifications from the thermistor?


  2. #2
    Join Date
    Nov 2010
    Location
    Serbia
    Posts
    2,247
    Thanks Thanks Given 
    129
    Thanks Thanks Received 
    15
    Thanked in
    7 Posts

    Default

    Are you sure the issue isn't more substantial than just a thermistor? Have you checked the primary and PFC FETs?

    Either way, just get something like this, it's simple current limiting... Watch the max voltage and amperage.
    Careful what you wish for... You just might get it.

  3. #3
    Join Date
    Jun 2010
    Location
    The Netherlands
    Posts
    5,380
    Thanks Thanks Given 
    381
    Thanks Thanks Received 
    116
    Thanked in
    89 Posts

    Default

    My eyes tell me that the thermistor is the only faulty component.

  4. #4
    Join Date
    Nov 2010
    Location
    Serbia
    Posts
    2,247
    Thanks Thanks Given 
    129
    Thanks Thanks Received 
    15
    Thanked in
    7 Posts

    Default

    But what does the scouter say about it's power level? No, wait...

    I'd check the FETs (if possible, out of circuit) to see if they're shorted internally... Just in case.
    Careful what you wish for... You just might get it.

  5. #5
    Join Date
    Jun 2010
    Location
    The Netherlands
    Posts
    5,380
    Thanks Thanks Given 
    381
    Thanks Thanks Received 
    116
    Thanked in
    89 Posts

    Default

    I measured the PFC FETs, in circuit, and I there wasn't a short. But you were right about that not being the only problem. When I tested the HX650 after replacing the fuse and thermistor, the fuse directly blows and the circuit breaker also tripped when I plugged in the power. But I didn't measured any shorts...

  6. #6
    Join Date
    Nov 2010
    Location
    Serbia
    Posts
    2,247
    Thanks Thanks Given 
    129
    Thanks Thanks Received 
    15
    Thanked in
    7 Posts

    Default

    A blown fuse is almost always a sign of a bigger problem. The only time I can conceive that a fuse would blow and the silicon is undamaged is if the primary caps fail catastrophically by shorting internally and the start-up current is so great the fuse (and the thermistor) goes out.

    Did you measure just the PFC FETs? Check the primary choppers too. There might be a short in the secondary, perhaps an internally shorted regulator coil (failed insulation between windings) which draws so much power the fuse blows. Primary is pretty beefy on the HX, so it could in theory survive such a surge. Even the 5VSB could be the culprit, check the integrated PWM/MOSFET primary 5VSB IC. I've had some Chieftec CTG600s (Sirfa) with failed primary 5VSB ICs. The result? Blown fuse, destroyed primary caps, some fried zeners.
    Careful what you wish for... You just might get it.

  7. #7
    Join Date
    Jul 2007
    Location
    Sweden
    Posts
    348
    Thanks Thanks Given 
    14
    Thanks Thanks Received 
    3
    Thanked in
    3 Posts

    Default

    You are sure you don't measure a short between live & neutral in the PSU?
    "The one who says it cannot be done should never interrupt the one who is doing it."

Similar Threads

  1. Corsair TX850 80 Plus Bronze Certified Power Supply
    By ronss in forum PC Power Supply Discussion
    Replies: 23
    Last Post: 10-16-2018, 03:49 AM
  2. EVGA 850BQ Bronze VS Corsair HX1050 Silver
    By AshTray900 in forum PC Power Supply Discussion
    Replies: 6
    Last Post: 11-25-2016, 07:10 PM
  3. Corsair GS700 Bronze vs Seasonic G-550 550W Gold
    By VaLee in forum PC Power Supply Discussion
    Replies: 5
    Last Post: 12-04-2012, 05:08 PM
  4. Corsair GS600 Bronze@infobit.pl
    By rafal_iB_PL in forum PC Power Supply Discussion
    Replies: 3
    Last Post: 11-10-2012, 09:36 PM
  5. Corsair TX650 V2 or SeaSonic S12II 620 Bronze?
    By jelson in forum PC Power Supply Discussion
    Replies: 5
    Last Post: 09-14-2011, 04:26 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •