Re: Need help on this lenovon Power supply
thanks: when i hit enter upon starting up it goes to bios and PC setup and start up safe mode i tried to change admin pass word but no avail,still asking for password i went to the person that gave the PC and for my surprise they told me to look for a Computer shop to format the disc and reinstall windows,what a great help,thanks but no thanks i don´t want to spend any money on this, i have plenty of computers in the house,if i can get this to work fine if not keep it for parts,.
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Re: Need help on this lenovon Power supply
QUOTE=selldoor;260704]Not all PSU's are the same - you might want to read this and see if it helps
https://www.badcaps.net/forum/showth...rey#post222842
I think your diodes are ok - pictures of the backs are no use for troubleshooting
- use daylight - no flash.[/QUOTE]
Thanks; i made it work don't ask me how but i just replaced those two rectifiers that i took out ,i also res soldered the third one and had also to make the connection on one of the lines that broke when i had to bend the hit sink in order to remove the rectifiers,ha and also had removed a cap that in circuit looked short but it was good out of circuit,i
but now that the pc is working it asks me for name and passwordLeave a comment:
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Re: Need help on this lenovon Power supply
Not all PSU's are the same - you might want to read this and see if it helps
https://www.badcaps.net/forum/showth...rey#post222842
I think your diodes are ok - pictures of the backs are no use for troubleshooting
- use daylight - no flash.Last edited by selldoor; 08-24-2012, 04:54 AM.Leave a comment:
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Re: Need help on this lenovon Power supply
Well i did test it correctly,and only have the 5v,i can say it's bad cause i have two other working pc power sup,and jumped those and i can see them working also can test voltages and they are their ,the problem is cannot use them cause they are bigger the plugs are smaller and do not fit
i took out those Schottky Rectifiers that i posted in the previous post but i don't know for sure they're ok.what other components should i look for?
thanks in advance.Leave a comment:
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Re: Need help on this lenovon Power supply
You did it wrong.
green jumper ground/black *PSU should come on
black probe on ground/black *doesn't have to be same as the jumper wire, any black will do.
red probe to test RED 5v, ORANGE 3.3v, YELLOW 12v.
Quickest way to test is get one of those cheap PSU testers. If all voltages are there, just recap the PSU.Last edited by Mad_Professor; 08-23-2012, 01:19 PM.Leave a comment:
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Re: Need help on this lenovon Power supply
Hi guys; i removed 2 of the STPS2045 and made some measurements with my Fluke on diode side and came up with this,see pic attachments below best i could get,
also disconnected the power supply from the PC and checked voltages red probe on green wire(PS-on) and black probe on most of the colored wires all i got was .05.00 volts so no 0.3,or 12volsAttached FilesLeave a comment:
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Re: Need help on this lenovon Power supply
Pictures are not big enough/clear enough for troubleshooting - if you mean the middle of the three transistors yes it does look burnt. Perhaps under too much pressure from rippling capsLeave a comment:
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Re: Need help on this lenovon Power supply
Did you check to see if it's supply 3.3, 5, 12v? You may have to short it to get the PSU on, get a DMM and check yellow 12v, orange 3.3v and red 5v for voltage, if you do and they are within 10% of the expected voltage then your problem may be as simple as dried/bad caps.Leave a comment:
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Need help on this lenovon Power supply
Hi guys,i was given this Lenovo Desktop but it´s dead now i'm trying to figure out what's wrong with the power supply,took some pic,i suspect this
http://www.alldatasheet.com/view.jsp?Searchword=2045CT
http://www.neweggbusiness.com/Produc...82E16883205400Attached Files -
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
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Opened it up and discovered the power supply is making a faint clicking or ticking sound.
I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles... -
I have a 15 - inch Retina MacBook Pro from the mid - 2014 model. Here is the link: https://www.badcaps.net/forum/showth...light=820-3662 . The battery broke some time ago. After I removed the battery and plugged in the original power adapter, the MBP could boot up normally. However, when I checked with IntelPowerGadget, I found that the CPU speed was limited to 0.8 GHz, and it ran very slowly. Later, I found a solution on GitHub. There is an open - source project called cputune that can set the CPU running speed. So I can now run the MBP at full speed. But another problem...
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