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Author Topic: PSU repair  (Read 6655 times)

Offline pampubliko

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PSU repair
« on: August 27, 2008, 04:56:12 PM »
mga masters need your help. I'm about to repair my generic PSU napalitan ko na mga cap (yun mga bloated). the problem I'm having now is yun overheated temp sa heat sink(mosfet-transistor kaya?)


voltage rail of 5v and 3.3v is way below the threshold

buying a new PSU is not an option

TIA


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PSU repair
« on: August 27, 2008, 04:56:12 PM »

Offline Woots29

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Re: PSU repair
« Reply #1 on: August 27, 2008, 05:09:22 PM »
nga pala saka lang nagoover heat ba kung nakabit sa pc o hindi
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Re: PSU repair
« Reply #1 on: August 27, 2008, 05:09:22 PM »

Offline RaffT

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Re: PSU repair
« Reply #2 on: August 27, 2008, 05:14:42 PM »
baka sira na xformer nun... or may short somewhere... kaya siya nag ooverheat... OPTION na talaga na palitan yun... or baka masira pa yung mobo mo... pili kalang
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Re: PSU repair
« Reply #2 on: August 27, 2008, 05:14:42 PM »

Offline pampubliko

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Re: PSU repair
« Reply #3 on: August 27, 2008, 05:49:15 PM »
@Woots29

kapag naka kabit lang sa mobo, kapag iniwan ko lang on(shorting #14-#15)hindi naman nag-iinit. grabe yun init hindi mo matagalan hawakan yun heatsink


@-=Rafft=-

I'd rather repair it myself than replacing a new one
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Re: PSU repair
« Reply #3 on: August 27, 2008, 05:49:15 PM »

Offline maldihtah13

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Re: PSU repair
« Reply #4 on: August 27, 2008, 06:37:43 PM »
rectifier ang alam ko dun sa tatlong nsa heatsink. Isa sa 3.3V isa sa 5V at ung isa pra sa 12V.

Ganito rin yta ung power supply na hinahack ko ngaun pra gawin bench power supply. Try ko check if the same pra maging reference natin as good.
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Re: PSU repair
« Reply #4 on: August 27, 2008, 06:37:43 PM »

Offline Woots29

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Re: PSU repair
« Reply #5 on: August 28, 2008, 09:11:23 AM »
kapag conected s mobo saka nagiinit, hmm d kaya mobo may problem(leaked cap). hiram ka muna ng ibang psu sa mga comp shop itesting u sa mobo u. kc sa pagkakaalam k sa mga generic psu, (kc may ngoooverheat din me na psu kahit alang mobo) nag flaflactuate ung voltage nya at maririnig kang mahinang tik-tik-tik.
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Offline glutnix_neo

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Re: PSU repair
« Reply #6 on: August 28, 2008, 09:50:31 AM »
wow cool ;D
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Offline maldihtah13

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Re: PSU repair
« Reply #7 on: August 28, 2008, 10:28:06 AM »
Sir ito ang laman nung akin



ito na sya pero di pa rin tapos


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Offline pampubliko

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Re: PSU repair
« Reply #8 on: August 28, 2008, 11:15:38 AM »
@Woots29

nag-iinit lang sya kapag naka kabit sa mobo. no leak/bloated cap on mobo.


normally ano ba dahilan and indicator na defective na yun transistor/mofet ?


@nomad13

nice project ^_^

ako plan ko bumili ng generic and then palitan yun mga component ng medyo maganda para medyo stable. and kunting mod na rin
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Offline glutnix_neo

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Re: PSU repair
« Reply #9 on: August 28, 2008, 11:17:50 AM »
hindi ba normal lang talaga na nagiinit xa kaya nga xa nilagyan ng heatsink?

one reason na rin kaya mas mainit xa pag nakakakabit sa mobo dahil loaded na xa?

gaano kainit po kaya? I think umabot man ng 60 deg eh normal pa rin yan.
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Offline akosiikem

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Re: PSU repair
« Reply #10 on: August 28, 2008, 01:39:26 PM »
Yung isa don high speed rectifier diode na baliktaran. May na repair na ko dati na PSU, my leak yung diode na to pag tinest na pareverse using analog tester. Try mo. If not marami pang possibilities.
Maybe mga caps na bagsak na ang ESR.

hoe this help  ::) ::)
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Offline pampubliko

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Re: PSU repair
« Reply #11 on: August 28, 2008, 04:42:39 PM »
@akosiikem

dude pano pagtest nun ESR (sorry noob question) ^_^


@glutnix_neo

yes normal dapat mag-init pero not to the point na napapaso kapag hinahawakan mo, ilalapat mo palang hindi mo na itutuloy


@all

alin ba ang mga primary component ng 5v base sa image
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Offline glutnix_neo

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Re: PSU repair
« Reply #12 on: August 28, 2008, 04:54:00 PM »
60deg is normal yet mapapaso ka na po,

expected din na mas magiinit secondary side since sa kanila dumadaan mataas na current as compared to primary.
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Offline pampubliko

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Re: PSU repair
« Reply #13 on: August 28, 2008, 08:08:51 PM »
@glutnix_neo

pero mas sobra ba dun. yun procie nag-iinit ng ganun din pero pede mo pa mahawakan.

sa sobrang init nangangamoy na sa init, dati kasi hindi naman ganun. kaya nga naka open psu habang on pc para ma-monitor
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Offline glutnix_neo

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Re: PSU repair
« Reply #14 on: August 29, 2008, 07:26:49 AM »
Quote from: pampubliko on August 28, 2008, 08:08:51 PM
@glutnix_neo

pero mas sobra ba dun. yun procie nag-iinit ng ganun din pero pede mo pa mahawakan.

sa sobrang init nangangamoy na sa init, dati kasi hindi naman ganun. kaya nga naka open psu habang on pc para ma-monitor

yun ang kakaiba kung amoy mainit na pyesa at kung dati ay hindi ganun kainit(although mainit pa rin ;D).

hmmmmmmmmmm, ???, sa secondary kung diode lang xa(at hindi FET for sync rectifier), palitan mo na lang yung mga diodes, pero check mo rin kung sino sa kanila ang sira(shorted both direction)

Nacheck nyo na po ba output voltage? Ang alam ko madami output yan so yung diode sa rail ng may kakaibang output voltage ang malamang may sira

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Offline akosiikem

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Re: PSU repair
« Reply #15 on: August 31, 2008, 12:02:47 PM »
My special equipment na png test ng ESR(effective series resistance). Mine is DIY na nakuha ko sa net.
Search mo ESR tester madami yan.  ;D
Post ko yung pic siguro
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Offline ydlazatp

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Re: PSU repair
« Reply #16 on: September 02, 2008, 08:37:13 PM »
bago lang po sa forum.
ano ang sira ng pc psu na kapag short mo ung pin14 and pin15(ps-on)mabubuhay pero mamamatay din,ung 5vdc standby ay okey.check ko na ung diode sa secondary ok naman,any tips sa mga guru.thanks
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Offline pampubliko

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Re: PSU repair
« Reply #17 on: September 02, 2008, 10:12:58 PM »
@akosiikem

may link ka pa nun diy project
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Offline glutnix_neo

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Re: PSU repair
« Reply #18 on: September 03, 2008, 07:35:58 AM »
Quote from: ydlazatp on September 02, 2008, 08:37:13 PM
bago lang po sa forum.
ano ang sira ng pc psu na kapag short mo ung pin14 and pin15(ps-on)mabubuhay pero mamamatay din,ung 5vdc standby ay okey.check ko na ung diode sa secondary ok naman,any tips sa mga guru.thanks

boss kung tatanggalin mo pson normal lang na mamatay xa, dapat palaging nakapson.
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Offline akosiikem

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Re: PSU repair
« Reply #19 on: September 03, 2008, 09:20:11 AM »
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Re: PSU repair
« Reply #19 on: September 03, 2008, 09:20:11 AM »
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