Author Topic: PSU repair (Read 6664 times)

maldihtah13 · « **Reply #40 on:** October 09, 2008, 11:34:16 AM »

ung modified ps ko biglang pumutok habang may nakalagay na solenoid lock sa 12V. Nung icheck ko may spark sign sa chassis at sa high side ng board. Then nung palitan ko ng fuse ayaw pa rin. After checking nakita ko sira ung rectifier diode sa input. Malamang resulta lang ito ng spark.

Anu kaya dahilan bakit nagkaganito ung power supply ko?

Philippine Electronics Forum · « **Reply #40 on:** October 09, 2008, 11:34:16 AM »

glutnix_neo · « **Reply #41 on:** October 09, 2008, 11:58:57 AM »

possible bang yung spark sign na yun eh cause lang ng pagsabog ng rectifier?

possible kaya caused ng foreign material sa loob?

Philippine Electronics Forum · « **Reply #41 on:** October 09, 2008, 11:58:57 AM »

maldihtah13 · « **Reply #42 on:** October 13, 2008, 12:27:20 PM »

Quote from: glutnix_neo on October 09, 2008, 11:58:57 AM

possible bang yung spark sign na yun eh cause lang ng pagsabog ng rectifier?

possible kaya caused ng foreign material sa loob?

di ko rin masabi kung cause nga un o effect. pero kung masisira ung diode di ba dapat manuna ung fuse before magkaroon ng spark? iniisip ko ksi bka may nabuild na HV sa high spark which causes the spark.

Philippine Electronics Forum · « **Reply #42 on:** October 13, 2008, 12:27:20 PM »

tony · « **Reply #43 on:** January 15, 2010, 05:18:28 PM »

Quote from: pampubliko 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

ang ginagawa ko dyan pinapalitan ko ng mas matatataas na rating yung mga rectifiers nya...mayamaya post ko pictures....
meron din akong idinadagdag na filter caps.....

eto yung thread ko sa tipidpc, baka me mapulot ka: http://www.tipidpc.com/viewtopic.php?tid=136978

Philippine Electronics Forum · « **Reply #43 on:** January 15, 2010, 05:18:28 PM »

tony · « **Reply #44 on:** January 15, 2010, 05:22:49 PM »

Quote from: maldihtah13 on October 09, 2008, 11:34:16 AM

ung modified ps ko biglang pumutok habang may nakalagay na solenoid lock sa 12V. Nung icheck ko may spark sign sa chassis at sa high side ng board. Then nung palitan ko ng fuse ayaw pa rin. After checking nakita ko sira ung rectifier diode sa input. Malamang resulta lang ito ng spark.

Anu kaya dahilan bakit nagkaganito ung power supply ko?

ang coils ng solenoid nilalagyan ng parallel na reverse biased diode para madischarge yung energy na nabuild-up pag inalis mo yung voltage....or during switch off..

Philippine Electronics Forum · « **Reply #44 on:** January 15, 2010, 05:22:49 PM »

tony · « **Reply #45 on:** January 15, 2010, 05:33:39 PM »

after modding, this is how the rectifiers looks like:

eto naman yung capacitor mods, me additional caps dun sa existing ones.....

glutnix_neo · « **Reply #46 on:** January 15, 2010, 05:34:25 PM »

Quote from: tony on January 15, 2010, 05:22:49 PM

ang coils ng solenoid nilalagyan ng parallel na reverse biased diode para madischarge yung energy na nabuild-up pag inalis mo yung voltage....or during switch off..

Master para sa motors at relays applicable to pero hindi dapat ilagay sa choke ng power supply kasi sa diode mapapadischarge yung energy na nakastore sa choke na dapat eh sa load pupunta,

@malditah

Pwedeng masira diode lalo na kung voltage ang sisira kung mbagal yung fuse,

stealthwalker · « **Reply #47 on:** May 09, 2012, 10:03:20 PM »

Quote from: glutnix_neo on January 15, 2010, 05:34:25 PM

Master para sa motors at relays applicable to pero hindi dapat ilagay sa choke ng power supply kasi sa diode mapapadischarge yung energy na nakastore sa choke na dapat eh sa load pupunta,

@malditah

Pwedeng masira diode lalo na kung voltage ang sisira kung mbagal yung fuse,

agree po ako.. kailangan sa mga repair fast fuse po gamitin..

tony · « **Reply #48 on:** May 10, 2012, 06:05:15 AM »

Quote from: maldihtah13 on October 09, 2008, 11:34:16 AM

ung modified ps ko biglang pumutok habang may nakalagay na solenoid lock sa 12V. Nung icheck ko may spark sign sa chassis at sa high side ng board. Then nung palitan ko ng fuse ayaw pa rin. After checking nakita ko sira ung rectifier diode sa input. Malamang resulta lang ito ng spark.

Anu kaya dahilan bakit nagkaganito ung power supply ko?

gumamit ka ng flyback diode sa solenoid para maiwasan ang inductive kick ng solenoid....irepair mo muna yung psu mo...

j a y k e z · « **Reply #49 on:** May 10, 2012, 07:41:18 AM »

Instabanana

??? · « **Reply #50 on:** May 10, 2012, 10:46:02 AM »

Dapat gawa na lang si sir ng additional how to thread. Sa PS section.

Asarnako · « **Reply #51 on:** May 10, 2012, 11:03:55 AM »

Tsalap pala i upgrade ng PSU's!

Sis/Master Tony Gawa naman po kayo thread ng upgrading repair ng PSU... Oki ha, now kow lang na apreciate na i-upgrade/repair ang PSU.....

Dami kow na tinapon kasi mas mura pa bumili ng orig surplus kesa i-repair.

Lola Baciang · « **Reply #52 on:** May 10, 2012, 12:19:10 PM »

pasubs

Philippine Electronics Forum · « **Reply #52 on:** May 10, 2012, 12:19:10 PM »

Philippine Electronics Forum