Re: Itek Atx 500W does not turn on
mmmmmm I don't know, do I try to detach them? which one should I take out of the three?
mmmmmm I don't know, do I try to detach them? which one should I take out of the three?
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Re: Itek Atx 500W does not turn on
or is there a way to test them?Comment
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Re: Itek Atx 500W does not turn on
now I try to remove the TL494 let's see what happensComment
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Re: Itek Atx 500W does not turn on
I removed the bigger transformer but it is not that, I have removed the TL494 and it is not that, there is crazy going outComment
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Re: Itek Atx 500W does not turn on
it's not even the central one that causes the short, I'm removing them one at a timeComment
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Re: Itek Atx 500W does not turn on
all you can do to test a transformer is check every winding for continuity and that other windings aren't shorted to one that shouldn't be. Other than that, to properly test a transformer you need a ring tester.
Is a ceramic disc capacitor shorted maybe?
The TL494 is on the primary winding, so it wouldn't cause a short on the secondary as they are isolated from each other.Last edited by CapLeaker; 04-20-2020, 01:19 PM.Comment
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Re: Itek Atx 500W does not turn on
what would this ceramic disc capacitor be? I do not knowComment
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Re: Itek Atx 500W does not turn on
ok I understand what are, tomorrow check, multimeter in diode test position?Comment
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Re: Itek Atx 500W does not turn on
either diode or ohms. diode check gives you a continuous beep if something is shorted.Comment
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Re: Itek Atx 500W does not turn on
three of these capacitors I had tried to pull them out of the circuit to test if the short was gone but I have not tested them individuallyComment
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Re: Itek Atx 500W does not turn on
well... that is a plus for a change!Comment
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Re: Itek Atx 500W does not turn on
but when I unplugged them the short was not eliminated, tomorrow I will try them all individuallyComment
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Re: Itek Atx 500W does not turn on
Arrrgh! I am ready for feeding a lot of power backwards and see what’s gonna blow up!Comment
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Re: Itek Atx 500W does not turn on
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Re: Itek Atx 500W does not turn on
I found a ceramic capacitor roasted on the primary, unfortunately the number is no longer visible, I removed it but the short remainsComment
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Re: Itek Atx 500W does not turn on
Even if the last transformer is removed, the short persistsComment
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Re: Itek Atx 500W does not turn on
send a picture as the PSU is at the present time, top and bottom.Comment
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Re: Itek Atx 500W does not turn on
okComment
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Re: Itek Atx 500W does not turn on
here they are, I showed you where the broken ceramic capacitor wasAttached FilesComment
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Re: Itek Atx 500W does not turn on
so what do you do?Comment
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Hello, 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... -
Laptop is HP Envy x360 13-bf0013dx, hp website link, it's an i7-1250U with 8 gig onboard ram.
Platform: ipa32 la-m024p rev 1b
Originally you'd plug power supply into it and it would take up to 1.2 amps and then drop to 200 milliamps and then go back up again to 1.2, staying all the while at 5 volts. Pressing power button would results in power LED blinking amber 3 times. 3.3 volt rail, 5.1 volt rail present, main power rail 8.8 volts. Power button test pads near EC chip 2.7 volts.
I found a short on the other side:
...10-04-2025, 05:03 PM -
To all the members here...
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If I remove the... -
Hi 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.
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The problem continues in the same way.
I tried to turn on the Fn key, nothing came to the screen....
Comment