I got a bad laptop that was only turning on sometimes and would turn it self off. I was checking out the capacitors and one was staying at 2.3 volts when it should of been 6.4v. I tried linking it with a different one and it started working but while testing I accidentally move wire and it touched a different cap and shorted out and has no power now. If I replace that cap should the computer turn on again. If I post pics of the two caps will someone on here be able to tell me what the are so I can buy the right ones. Thank you
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Re: motherboard short repair question
anyone? -
Re: motherboard short repair question
caps arent likely to be the problem
how about the make & model?
maybe even a foto or 2 showing what you touched??Comment
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Re: motherboard short repair question
in photo 81 is the cap thats blue is shows k06w 150 6.3 v. it was only showing 2.3-2.5v when tested. in photo 80 is the cap next the right to pc50 it was coming up at 19-20v before I shorted it. that was the one I linked tto the blue cap.
its a dell inspiron 1564Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: motherboard short repair question
the voltage marked on the cap is not the voltage you should see, it's the maximum it can take without being damaged.
you need very good pictures of the area to the right of pc50 including the square chip it connects with.Comment
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Re: motherboard short repair question
I can I post a page of the schematic for pc47 on here or is it against forum rules?Comment
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Re: motherboard short repair question
That's fine. You can post a schematic.I love putting bad caps and flat batteries in fire and watching them explode!!
No wonder it doesn't work! You installed the jumper wires backwards
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Re: motherboard short repair question
here the pageAttached Filesif you find these attachements useful please consider making a small donation to the site
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Re: motherboard short repair question
Anyone please helpComment
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Re: motherboard short repair question
took the cap I shorted off and there no power going to the pads.Comment
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Re: motherboard short repair question
"I think that one was pc47 not pc 50. I found a schematic and pc50 shows 6.3v when the cap tested 19-20v and pc47 is 25v"
Are you saying that the DCV on PC50 (filter cap for 5V supply) you are getting 19-20V on this PC50 cap?
And you are not getting any DCV on PC47 which is part of multiple filter caps for +PWR_SRC?
PC50 is rated Voltage is 6.3V (it does not mean it will have 6.3V on the cap).
PC47 is raeted at 25V (it does not mean it will have 25V on the cap).Last edited by budm; 05-18-2015, 10:11 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: motherboard short repair question
Then you need to look at the diagram to find where the circuit that generates the Voltage source +PWR_SRC is at. It may have fuse for protection.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: motherboard short repair question
Look at the schematic to at least to locate the +PWR_SRC power supply.
I am sure there are lots of SMD fuse on the board.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: motherboard short repair question
Is this the page I should be looking at?Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: motherboard short repair question
https://www.badcaps.net/forum/attach...6&d=1432064514
That is the one.
+DC INPUT fed into the MOSFET PQ1, check and see waht you have on pin 5~8 (in), 1~3 (out), pin 4 (gate).
Do the same on PQ2.
Check the current sensing resistor PR8 (6?).Last edited by budm; 05-19-2015, 03:03 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Hi All, I have a 9th Gen Dell Optiplex micro PC motherboard which doesn't power on. When I connect the motherboard with power adapter, it goes into safe mode and turns off. So from info I have gathered online, it looks like there is a short circuit on the motherboard. So can you guys help me with figuring out the issue?
I am new to electronics repair, so my queries could be naive but I am ready to learn.
So I have a multimeter and a solder with me. But I can try to get a variable voltage power supply with a thermal camera as well. From what I seen online, best way is... -
Hello,
this is my first post at Badcaps and in general i am new to fixing electronics. I am looking forward to learn a bit more about diagnosing and repairing :-)
What I have around is a DELL OPTIPLEX 3060 Micro (USFF), which is not powering on, even not showing any signs of life (No amber / white LED).
I got a original 65W DELL PSU / Power brick (PA-12 / 074VT4) which hopefull should be the correct one. I could get another DELL PSU with the Partnumber 0G6J41 with the same 4.9mm DC Jack connector as the one I already have, but I dont think that would help (maybe... -
Hi,
I am working on an Asus ROG laptop repair. I was able to find that there is a short on the motherboard, and the 20 volts from the charger only gets to the first mosfet before disappearing.
When looking around with a thermal camera, I noticed the chip marked "14C" in the picture was getting warm. Nothing else was receiving heat.
I found a boardview diagram and schematic for a motherboard that looks nearly identical, that has the same component. This appears to be marked as "AC Short Protection" with a value of 13.7KOhms.
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Hi beginner here, so I'm not sure of I've done this right 😅 trying to diagnose my laptop's motherboard (dax31mb1aa0 rev a). I don't quite know how to read the schematic, so I'm attaching the pictures of the motherboard and the measurements.
I was attempting to measure resistance to GND on inductors. I disconnected motherboard and used "continuity testing" setting on my multimeter. I put black probe to Ground & red probe on an inductor. Did I measure this right? Am I correct to think that 0.3 ohm measurement indicates a short circuit? Thank you for your help!... -
the comon problem they say , the charger will shut off power once plugged to laptop , i dont have battery, its long gone ago , i use it for backup with adapter and vga port to external monitor(yes no screen lcd) in case my desktop needs fix . one thing for sure i could say the clr resistor - r010 beeps ,short at both sides , the checked all the coils , the 3 coils together gives all of them beeps short along with their respective capacitors . i dont have voltage ampere injection dc machine as in videos i have seen they see where its getting hot and they remove the short and replace components...
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