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Thread: Mastero MK-4.5 250w 12v DC-DC ATX PSU + SDC

  1. #101
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    Mine only output 4.98V under no load and engine off.
    What is the reading for each chip?
    Make sure the Max chips, Diode, and HS are all issolated.
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  2. #102
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    the output of the max787s are 8v for both
    although they are connected so...

    also i'm pretty sure they're isolated

    btw, why do they have to be isolated if they share the same ground anyway?


    edit: all good now, there was a tiny short between the in/out of one of the 787s

  3. #103
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    my power supply decided not to work today...
    i connect it up and nothing happens, so i'm expecting a broken relay
    would it be the small 12v one?

  4. #104
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    Check the voltage on all rails (3.3, 5.0, 12, -5, -12, PG, STBY)
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  5. #105
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    none of the voltages are working, cos there is no relay "click" when i conect power which is why i think the relay is gone

    although ps-on is at 0.23V

  6. #106
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    When you first hook up power to the main connector, does the jumper wire next to the 204 POT, jumper header and small 12V relay has ground? To test that, put the red lead of the multimeter to power (battery) and the black lead to that jumper wire. This jumper wire has ground when the SDC is working. If that wire doesn't have ground, the SDC part has problem. This ground is to power the small 12V relay right next to it.
    Now put a jumper on that jumper header next to 204 POT, the PSU should be in it standby state. The STBY LED should lit up. PSON, STBY connector should read 5V, if not, the Stand By 5V regulator is dead or the relay next to it is dead.
    If all fine, move to the main relay, to turn it on, Ground PSON pin by shorting pin 14 and 13. If that main relay doesn't click, well replace it.
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  7. #107
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    no that first part is NOT grounded, although with the power disconnected there is a 500odd kOhm connection from that part to ground :S

    btw, what does jumper J1 do?

  8. #108
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    When the SDC is working (ON state), that part, the jumper wire next to J1, will have GROUND. When the SDC is OFF, that jumper wire doesn't have anything. JP1 bypass the SDC's system off part and put the PSU in its standby state. In standby, the small 12V relay is always on (coil always energized) and thus the STBY pin always get 5V. And so USB devices will always on. Just like home AC PSU when you shutdown the PC. If you short J1 and STBY doesn't have 5V, either the 12V relay is dead or the 5V regulator (LM1084IT-5) is dead.
    To find out which one is dead, test pin1 (Left most on component placement view) of the 5V regulator against ground to see if it show battery voltage (12V). If there is 12V, then the relay is okay. If not, the relay is dead. If there is voltage on that pin and no 5V output, then the 5V LM regulator is dead.
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  9. #109
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    ah, turns out it was a blown 4148 diode that was shorting 12V in and ground when J1 is jumpered

    but... there must be a problem now with the shutdown controller part..

  10. #110
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    If the 1N4148 diode accross the small 12V relay's coil is burned, replace it it 1N4007. On mine, that diode is burn too when the SDC is working. I replace it with 1N4007 and has NO problem at all.

    Just to make sure all the voltage read properly before hooking up the mobo. Short Pin14 and Pin13 to turn the PSU on and test the voltage.
    Also I test it first with my old "throw away" mobo w/P3 350 to see if all work before hookup to my carPC.
    Since you already have a shorted on the 787, you may double check that as well.
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