Guys i have a PSU AcBel 450W that problem cannot be turn on when plugged to motherboard..... when i sorted it from green to black it can powered on... is this supposed to caps or anything else related ? give me some advice ^_^
AcBel 450W cannot turn on ?
Collapse
X
-
Re: AcBel 450W cannot turn on ?
Since it turns on manualy, I would think it is more of a motherboard issue. -
Re: AcBel 450W cannot turn on ?
O.O ... Guys .... i don't think its the mobo ....or my PSU swicth (at back) ....juz now .... i used my PC around 15minutes .....my PC suddenly power off itself...then cannot turn on anymore ...light indicator showing power good .... ?_? i really confuse now... anyone had any idea ??Comment
-
Re: AcBel 450W cannot turn on ?
Abang Wan901, not sure what's ur system configuration... It could be due to supply overload.
[ ...light indicator showing power good .... ]
is this the LED on ur mobo ? It is Standby 5V, not POWER GOOD signal. Power good signal is from pin (8) of 20-pin/24-pin connector (grey color wire).
Power Good is only available upon power on....
Could be bad e-cap... if ur PSU is no longer in warranty. I suggest u to open it and take a look inside...Comment
-
Re: AcBel 450W cannot turn on ?
Jumper the supply to turn it on and measure the 12 volt (yellow wire) and 5 volt (Red Wire) rails are they excessively low?
Or does the supply just make a high pitched whine when you try to start it up?
If so thats a protection circuit kicking in reducing the switching frequency of the supply.
I wouldn't get to concerned with the Power Good signal some cheap PSU manufacturers just tie that wire to the 5 volt rail in other words unless the PSU really took a dump and doesn't supply voltage at all its useless.
Good PSU manufacturers have a Power Good Generator IC that the wire is tied to and the IC monitors the supply voltages if the voltages are good it sends out the 5 volts through the wire. If a voltage is wrong it cuts off the 5 volt supply which shuts the supply down in a case of an under or overvoltage condition.
In any case I'd pop it open to check for any bulged caps inside.Last edited by Krankshaft; 12-17-2007, 06:25 AM.Elements of the past and the future combining to make something not quite as good as either.Comment
-
Re: AcBel 450W cannot turn on ?
10 minute post edit you are the bain of my existence.
If the Fuse, Line Rectifier, Switching Mosfets, Secondary Rectifiers, Optoisolator, and Caps check out and the supply is still dead its probably a Bad PWM or Power Good IC or one of their surrounding components.
Without a scope to monitor the PWM IC for a drive waveform this is the only way to troubleshoot them.
I have a scope but there is no way I'd ever hook it up to this line powered equipment without an isolation transformer. I've gotta just break down and buy one already.
I recently brought back a switcher for my old D-Link wireless B router that took a dump during a series of about 4 brownouts in the summer. Everything inside checked out good so I replaced the PWM IC and we're back in business.
I guess the IC got pounded with too much startup voltage and the internal regulator just blew. The IC had no signs of case damage on the outside.Last edited by Krankshaft; 12-17-2007, 06:34 AM.Elements of the past and the future combining to make something not quite as good as either.Comment
Related Topics
Collapse
-
by pajdekHello, i have some issues with my laptop Lenovo Y700-17ISK (motherboard BY511 NM-A541), it started when i turn on the laptop, but the lcd wont turn on, i then connected it via hdmi to tv and screen was ok. So i thought maybe lcd stripe is faulty, i removed the bottom cover, disconnected main battery, reset the cmos by disconnecting battery for 1 min, then slighty move the lcd stripe. Conncted power supply and tuned on my laptop, the lcd turn on, it started to load os, then it turn off, after a second it turn on, then after like 3 seconds turn off again, and so on. Removed power supply, waited...
-
by RdeveLabsTo all the members here...
Let me tell you a little bit about what happened to my laptop (MSI GF63 THIN 11UCX model: MS-16R6) that “maybe” you know how to solve this problem.
So before this problem happened, my laptop was running smoothly. When I wanted to restart my laptop, it looked fine at first. But after I waited for this restart process to take a long time, until finally I panicked (because the restart process did not finish plus the laptop screen only showed a black screen), I immediately pressed and held the power button to force the laptop to turn off. But... -
by robante15Hello, I have an Acer Aspire 4520 from a couple of decades ago and I want to repair it solely for nostalgia.
It happens that when I turn it on after having been disconnected for a long time, it turns on without problems, it tells me that the BIOS has been reset and that it will load the factory settings, if I tell it to continue, the computer turns on and everything works fine.
The moment I turn it off and want to turn it back on a second time, or restart it and try to start it again, it no longer gives an image, and it no longer responds.
If I remove the... -
by masoksianHi everyone,
I am dealing with the problem of turning on and off my Dell e7470 notebook.
The battery charge light is solid white, I press the button, the power indicator and the light on the button are solid for 1-2 seconds and immediately turn off.
The system does not turn on, there is no post.
I removed the RAMs and changed them, changed the battery, RTC battery, AC adapter, removed them and waited, tried again, it does not turn on.
The problem continues in the same way.
I tried to turn on the Fn key, nothing came to the screen.... -
by dqtechi got this laptop with no power issue....i flashed the bios and laptop can turn on and use normally....but when i shut it down and rest for few minute (2-3 minutes), it wont turn on....i have to flash bios again...any idea what is the problem?...when i shutdown and suddenly press power button to turn on, it will turn on normally....problem happen when i rest the laptop 2-3 minutes after shutdown, it will not turn on....i need to flash bios again
board number VIUX1 NM-A091 REV:1.0... - Loading...
- No more items.
Comment