am I correct in saying this cap is likely the problem and needs to be replaced and the usb load switch is probably still ok?...
roxboy1984
Senior Member
Last Activity: 06-04-2025, 05:02 AM
Joined: 01-27-2022
Location: Umhlanga Rocks
-
That is correct. USB load switch is off the board. Please see attached pic of measurements.
am I correct in saying this cap is likely the problem and needs to be replaced and the usb load switch is probably still ok?... -
Thanks [USER="127018"]Mon[/USER], by any chance do you know of an easy way of doing this? Or perhaps know where I can find a boardview?
could I possibly inject some voltage on the VOUT and see if anything gets hot?
apologies if my questions are dumb as I’m very much a noob still.Mon...Leave a comment:
-
The resistance to ground on the pad for VOUT is 0.4ohms....Leave a comment:
-
So my thermal cam has a bit of an offset ghosting affect to so it looks as though the hotspot isn’t over the mosfet but it actually is.Leave a comment:
-
Thanks, I removed the IC and still no sign of life.
There is a mosfet that is getting a little warm but not super hot as you can see in the pic....Leave a comment:
-
This is the area and attached pic. The circled IC is getting very hot....
Leave a comment:
-
Dell Inspiron 7568 not turning on? Boardview anyone?
Hi,
Does anyone possibly have the boardview file for this board. I have the Schematic already.
The IC labeled "53A8" is getting extremely hot. This seems to be a 5V voltage regulator.
18706-1
H3KD8 -
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?...Leave a comment:
-
is the TPS5128A and TPS5128B PWM IC interchangeable?Leave a comment:
-
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:
-
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:
-
Here is a Boardview for whoever needs....Leave a comment:
-
Thanks so much.. So the PWM chip is PU8701 and the cap is PC8702....Leave a comment:
-
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:
-
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:
-
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:
-
Thanks, so i measured from Red wire to ground and im getting 5.3 ohms. would you say thats dead?...Leave a comment:
-
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:
No activity results to display
Leave a comment: