HX750 can't turn ON

[frogz81]

Hi,
I need help. I have HX750,
the problem is when turn ON PSU, the fan only spin a moment.
before the issue occur, the PG signal is 4.5 V.
need help, where i must started to check?

Thx

[frogz81]

Re: HX750 can't turn ON

Adding attachment from http://www.hardwaresecrets.com/ since i don't have good camera.

[Viperel]

Re: HX750 can't turn ON

Are there any visual defects present on the board? Some photos of YOUR psu would really help...

[ChaosLegionnaire]

Re: HX750 can't turn ON

your symptoms seems to indicate a short circuit. it could be on the motherboard or in the psu.

[frogz81]

Re: HX750 can't turn ON

Already checked Output and no short circuit ,
the pin 5Vsb is normal 5,04 V

[frogz81]

Re: HX750 can't turn ON

Help

[stj]

Re: HX750 can't turn ON

check for shorted diodes on the outputs

[frogz81]

Re: HX750 can't turn ON

up date,
change Cap in 5vsb 1000uf/10v NCC KY wilt ruby zlh 2200/16 and it's works
strange thing is the NCC capacitance is in spec, and esr 0,4

[RJARRRPCGP]

Re: HX750 can't turn ON

up date,
change Cap in 5vsb 1000uf/10v NCC KY wilt ruby zlh 2200/16 and it's works
strange thing is the NCC capacitance is in spec, and esr 0,4

Sounds like the cap possibly had bad solder joints...

[stj]

Re: HX750 can't turn ON

or high leakage, or low ripple capacity - a lot of testers dont show that.

[Clutchbox]

Re: HX750 can't turn ON

up date,
change Cap in 5vsb 1000uf/10v NCC KY wilt ruby zlh 2200/16 and it's works
strange thing is the NCC capacitance is in spec, and esr 0,4

NCC KY 10v 1000uF according specsheet:

1,000 8x20 0.069 Ohm 1,050A
1,000 10x16 0.060 Ohm 1,210A

An ESR of 0,4 Ohm (400 mOhm) is much to high for this capacitor, maybe it was the culprit.

[jiroy]

Re: HX750 can't turn ON

Sounds like the cap possibly had bad solder joints...

100 % and it's better if he resolder whatever stressed joints he can check ...