roxboy1984
Senior Member
Last Activity: Today, 06:11 AM
Joined: 01-27-2022
Location: Umhlanga Rocks
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So the resistance to ground with the cap removed is still very low. Around 1.3ohms. So I don’t think the cap is the issue. I removed the PWM and checked the resistance on pin 3 and it was still low. Should I inject voltage on pin 3 with PWM removed and see what gets hot?... -
is the TPS5128A and TPS5128B PWM IC interchangeable?Leave a comment:
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Ok so I'm now stuck. I don't think that the Cap is actually shorted as the resistance to ground with the cap removed on pin 3 of the PWM is still very low.
The PWM IC is getting really hot. how would I test and see if the PWM IC itself is dead? Appreciate the help.Leave a comment:
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Please could someone confirm this for me. I have the following donor board that I'm looking for the necessary donor capacitor on. If I'm reading correctly the Cap "PC4723"on the Dell board would be a sufficient replacement for the Asus board?
[SIZE=22px][COLOR=#8e44ad][B]LINK to schematic[/B][/COLOR][/SIZE] [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/98960-dell-inspiron-3542-fx3mc-13269-1-pdf-and-brd?t=112466&nojs=1[/url]Please could someone confirm...Leave a comment:
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Here is a Boardview for whoever needs....Leave a comment:
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Thanks so much.. So the PWM chip is PU8701 and the cap is PC8702....Leave a comment:
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Please Help , Asus Zenbook Motherboard repair
Please could someone help or advise me. I have an Asus Zenbook UX305UA that I am trying to repair. I'm still a newbie but I'm learning. Under a thermal cam I noticed that the TI 1285A IC is getting very hot. I checked the resistances to ground of all the pins connected to this chip, and found that pin 3 has a very low resistance of 1.8Ohms so I checked the Ceramic cap which is next in line, on continuity mode and the cap appears to be shorted. This is a 4.7uF 6.3V capacitor. My question is, do I need this cap? can I jump it? I have some donor boards laying around. What Cap would be an ok replacement... -
Thanks i will check this and post results as soon as i can....Leave a comment:
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When you say works ok on adapter voltage, do you mean i should inject 19v using bench supply.
link to schematic [url]https://www.badcaps.net/filedata/fetch?id=1980830[/url]https://When you say works ok on ada...=1980830[/url]...Leave a comment:
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Dell Inspiron 15 AC adapter turns off as soon as connected (MB Short)
Please can someone help me, im trying to find the shorted component as i have a donor board that i can swop components from.
If i inject 2V/2A on DC in PU4201 gets really hot. ive changed out PU4201 from another board as well as a couple other Mosfets but PU4201 still gets crazy hot when i inject. Any ideas? im still a noob so am learning.... -
Thanks, as always your help is much appreciated. So there is no other way of testing to see if things are still ok and the problem lies elsewhere?...Leave a comment:
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Thanks, so i measured from Red wire to ground and im getting 5.3 ohms. would you say thats dead?...Leave a comment:
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Thanks so much for the reply. So where i injected is that on the CPU rail. is there any way i can check if i fried it....Leave a comment:
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please help with LA-D451P Board repair
Hi,
I know this is probably going to be a very noob question but i have this board that someone has worked on already and im trying to troubleshoot. the previous person soldered wires at "pci1026" for voltage injection and if I inject 2.5V @ 2Amp the CPU gets very hot. does this mean the CPU is likely fried? also it looks like multiple components have been removed from the area where the wires are soldered? any help is massively appreciated.... -
Do you by chance know the Vendor of the "K2L31" ? or possibly have a boardview for the LA-H931P?...Leave a comment:
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Thanks so much as always for your help. The two models that I have are attached. The one that I’m trying to repair is the 9360....
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Donor IC question?
Hi Guys, I have a Dell XPS 13” laptop that I’m trying to repair. If I look at the board with a thermal cam. The following component “3W=Q2W” which looks like a voltage regulator is getting very hot. So my question is. Can I swop it out with this one. “K2L31”? I can’t seem to find any data sheets. Please see pics for reference. Thanks for any help or advice....
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Thanks so much for the reply. It’s a discreet graphics. I haven’t actually checked the connector for corrosion. I just found it strange that if it were the connector then surely the current screen would work on a different machine which it didn’t. I will open it up and have a look under a scope and get the motherboard part number.Leave a comment:
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bump!...Leave a comment:
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Strange issue with Macbook Pro 15" mid 2015
Please could someone assist. Im having a very strange issue. So i have a Macbook pro that was having screen issues where the screen would glitch and show artifacts etc so i initially thought the screen needed to be replaced so i got a replacement and installed the new screen which was just completely black. i can get a display on an external monitor but i get no display on original glitchy screen anymore and ive tried multiple working screens and they are all blank and ive tried the orignaly glitchy screen on a different macbook and that is also now black. But again it works perfectly on an external...
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