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[UPDATE] monitor died. bad power board? - Page 2

post #11 of 21
OH yeah they are bulged i can see at least one or two with definite arch/curve to the top. the tops where the "x" is are supposed to be perfectly flat.

usually the cheap ones go bad after 5 or 6 years regardless if they are bulged. if possible you could replace them all.

PRO TIP: replacement capacitors need to the be the same "UF" rating and the same PHYSICAL SIZE the voltage has to be the same or higher. voltage can NOT be lower than the capacitors being replaced.
Edited by cdoublejj - 3/12/13 at 7:00pm
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post #12 of 21
Thread Starter 
Ok sweet. Should be an easy fix. Any recommendations on replacement cap brand? I'm kind of a newbie when it comes to electronics components.
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post #13 of 21
Rubycon, Samxon, or Nichicon are generally good choices. should be able to find some on ebay. heck i might even have some samxon's i could send you if they are the right rating.
post #14 of 21
Thread Starter 
Awesome. Thanks a lot guys. Thanks for the offer but I'll just grab a bunch off ebay. Hopefully I get this thing working again here soon.
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post #15 of 21
if you order on line measure the caps with ruler or tape measure. I get as close i as i can for height and width. Places like digikey or jame co should list measurements. again the size of dictates an unmarked value and voltage is just how much it can handle and can not be lower than that being replaced.

That said i got my last batch/bundle from digi-key.
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post #16 of 21
Yeah Dbeau on the 3rd picture down, replace all the canister caps on that board is the easiest way to be sure to get the bug. Thats how I fixed an old 1 once, and all is caps looked fine, but 1 or more were bad. Still works.

Just make sure they are voltage rated = or higher than the originals.

Lately I've scraped some small CRT TVs that were FREE, lots of people upgrading to LCDs and always giving away old CRTs, they are a great source of components. I have a small power source board from a DVD player, I have fried some of its caps I'm sure, so later today I will replace 6 caps at the output end with ones from a TV.
Edited by Kaltenbrunner - 3/13/13 at 12:27am
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post #17 of 21
yeah at the shop i work at collect the boards out of LCD i can't fix and dead laptop ac adapters and dead motherboards etc etc. My last project an Antec PSU some the of caps actually shrunk up in side and and rattled when you shook them. crazy stuff.
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post #18 of 21
Quote:
Originally Posted by Kaltenbrunner View Post

Yeah Dbeau on the 3rd picture down, replace all the canister caps on that board is the easiest way to be sure to get the bug. Thats how I fixed an old 1 once, and all is caps looked fine, but 1 or more were bad. Still works.

Just make sure they are voltage rated = or higher than the originals.

Lately I've scraped some small CRT TVs that were FREE, lots of people upgrading to LCDs and always giving away old CRTs, they are a great source of components. I have a small power source board from a DVD player, I have fried some of its caps I'm sure, so later today I will replace 6 caps at the output end with ones from a TV.

I have been using it as a +5 +12 +/-7 -24V PSU from a DVD player, for my breadboards

And from time to time the output wires touched by mistake/carelessness, I would hear a high pitched whine I guess was the big canister style inductor. And I bet the inductors, resistors, diodes, and even the IC, transistor, transformer and optocoupler survived, but I bet some of the caps never

A week ago it seemed the 5-grd was not working right under load, and the 12-5=7V seemed broke too with the ICs I was trying. I don't know much about ICs, but I bet I ruined some elec. caps
Edited by Kaltenbrunner - 3/13/13 at 10:42am
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post #19 of 21
Thread Starter 
[update] Good news. New caps went in without a hitch and I now have a fully functional monitor again. It was actually quite fun. Thanks again for all the help everyone thumb.gif
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post #20 of 21
thumb.gif Good soldering practice too.
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Alienware M17x-R4
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Core 2 Haf
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WD Blue 5400 RPM 1TB ODD Conversion w/ White Label 2TB Empty / Free Bay Converted External USB 
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M14x R2 10 CFM CPU fan Liquid Metal Pro Windows 10 /w Telemetry Block  1080p 120Hz eDP 
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Sony FW900 @ 2304 x 1440 @ 80hz Saitek Eclipse I Dell 330 Watt Brick Logitech G500s 
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Intel Dual Band Wireless-AC 7260 w/ BT iGPU disable / bypass 
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C2Q Q9550 ASUS P5E3 Deluxe Wifi-AP EVGA GTX 770 4GB Classified Kingston HyperX DDR3 KHX1600C9D3K2/8G 
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PNY 1333 55gb, 320Gb, 500GB, 1TB Corsair H80 Win 7 Ultimate 64bit 
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