Announcement
Collapse
No announcement yet.
User Profile
Collapse
-
PU4502 was shorted on all of the pins. Removing it solved the short on DCBATOUT. Now, shorts on PWR_DCBATOUT_5V and PWR_DCBATOUT_3DV3 are present.
-
Cedar 13269-1 FX3MC DCBATOUT short
I've a FXMC motherboard with a short on the DCBATOUT line.The moment the charger is plugged in to the board, it will block itself for protection. I have remove PR4402 for isolating the short, and making sure the short doesn't come from AD+_TO_SYS.
Schematic:
[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"]https://www.badcaps.net/forum/troubl...=112466&nojs=1[/URL]I've a FXMC motherboard
-
Cedar 13269-1 FX3MC DCBATOUT short
I've a FXMC motherboard with a short on the DCBATOUT line.The moment the charger is plugged in to the board, it will block itself for protection. I have remove PR4402 for isolating the short, and making sure the short doesn't come from AD+_TO_SYS.
Schematic:
[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]https://I've a FXMC motherboard with...ger is plugged
-
Re: HP 14-R no power, buck controller getting hot
I don't have a lab power supply, just getting started with repairing electronics.
Edit: i may have acces to a power supply in my university, on one of the electronic labs. I'll see if they can let me use one for solving this shortLast edited by ReparaPC; 10-28-2022, 12:46 PM.
Leave a comment:
-
Re: HP 14-R no power, buck controller getting hot
After lifting one leg, before the coil there's a resistance of 575kohms BEFORE, and a resistance of 5ohms AFTER the coil. Seems like the short comes from the 3VALWP rail.
Edit: i've decided to desolder PJ302, as pin 5 of PU301 is also connected to the 3VALWP rail, so we can be totally sure there's no problem with the chip (for now)Last edited by ReparaPC; 10-28-2022, 12:13 PM.
Leave a comment:
-
HP 14-R no power, buck controller getting hot
I've got and HP 14-R with motherboard compal la-a995p rev 2.0 with no power. PU301 (RT8243A) is getting hot when the charger is connected, and 3.3v or 5v are not present. PL303 has a resistance to GND of 5ohms. Please, i need help on fixing this motherboard if possible. i'll attach the schematics...
No activity results to display
Show More
Leave a comment: