power brick dead

[ratdude747]

i got a power brick in the mail today

ran for an hour, unplugged it, replugged it, ran for a sec and died

will not work

popped it open to find no failed caps

some tiny ones jwco

everything with vents nichicon

big one vz (m) series

small ones pj (m) series

bought from ebay store "monster power"

need help since it will not shot wothout some glue

its a ac 12v 4.0a used on a sharp flatscreen tv

no power/led

i have no dmm at this time

[Krankshaft]

Re: power brick dead

i have no dmm at this time

Well you'll have to get one then .

Not an expensive one a cheap 20 dollar one from Ratshack will do.

A DMM is a bare basic for troubleshooting anything especially PSUs.

[ratdude747]

Re: power brick dead

fixed it

broken trace next to power plug

made a thick solder bridge to fix it

works fine now

[ratdude747]

Re: power brick dead

oh and ivdo have one but it needs new batteries and doesnt do much

ill get one at the electonis store where i buy my equipment. they sell stuff at radarshaq prices but with primo quality. i bought my iron and sucker there and they sponsor the robotics team im on. the stuff they donated gets used and abused for 6 weeks of the year and the rest of the time it has to work on demand. never had a tool break, and they do the job well

[Wizard]

Re: power brick dead

ratdude747 that good diagnosis, but you need to lay down short length of bare braid or wick across break and solder it. Solder alone is not strong enough and will crack again in short time.



Cheers, Wizard

[Wizard]

Re: power brick dead

ratdude747 that good diagnosis, but you need to lay down short length of bare braid or wick across break and solder it. Solder alone is not strong enough and will crack again in short time.



Cheers, Wizard

[ratdude747]

Re: power brick dead

actually, it broke because the cable they gave me fit too tight. if it breaks again ill just hardwire it and be done

what happened was i was fixing a cold joint i found when i noticed the mickey-mouse jack felt really loose. ant i saw the dead trace. the tight cable required so much wiggling that any jack would go like that. thank god i had another cable from an old dell laptop that fit much better

what makes it all funny is if i returned it, i would pay shipping to and back, costing a total of over 2o bucks. i paid 30 for the cable. for 10m bucks id rater void a warranty and fix it in 10 min rather than wait 3 weeks for new cord

and i paid 11 bucks at a goodwill for the tv. display model. small 13'' one, EDTV (in between SDTV and HDTV (1080p). great picture.

[ratdude747]

Re: power brick dead

and is it so odd to find all major caps in brick to be nichicons in an el cheapo brick? and good, non hm/hn ones too.

[ratdude747]

Re: power brick dead

and still working...

[ratdude747]

Re: power brick dead

damn it, tv died. screen cracked. something fell on it or something. ill use the cable for a torpedo projector that needed a brick with same specs.

[Agent24]

Re: power brick dead

Damn, that sucks.

I had similar problem with the power supply for a wireless AP. Turned out to be an open startup resistor

[ratdude747]

Re: power brick dead

oh s***. the damn projector needs a 5A, not a 4A. no wonder it wasn't very bright. ill modify the cord's connector to work with my eee pc.

[370forlife]

Re: power brick dead

This is why I use my astec 425W psu for powering things.

It has 12v, 5v, and 3.3v sense. (proprietary astec housecleaning chip for that)

Not to mention 2 12v rails at 15A each, it makes a excellent lab/rc car charger/window fan power/well, you get the picture.

Plus I will die before this thing does, and it was only $10.