Yes, I have 3.3V and 5V rails present.
Replacing the charging IC didn't change anything in laptop's behaviour.
Replacing the charging IC didn't change anything in laptop's behaviour.
-
-
Your thread has been moved from the "Schematic requests ONLY!" sub forum to the laptop troubleshooting forum.
Read this if you want to post a link to the schematic -> https://www.badcaps.net/forum/troubl...f-this-section
-
-
This is a guide that I am writing for helping others to replace their MEC1503 EC chip if it breaks (or to get around an inconvenient prompt to the BIOS). This forum has been extremely helpful to me so I would like to contribute to help others. I will tell you right now that this task is very difficult to do. You MUST have experience and tools to do precision micro-soldering, BGA reballing, trace repair, and general laptop repair skills.
There are some specialty tools needed to do this task. The replacement MEC1503 chips can be acquired from Aliexpress. Do not buy the bare chips as... -
Hi
I have a very strange issue with the BIOS SPI chip of an ASRock B650M PRO RS motherboard.
The SPI chip is an Winbond 25Q256JWEQ model (1V8).
The motherbaord doas not POST - it lits only CPU and DRAM EZ Debug Leds, and stays that way forever.
The Flashback function of the motherbaord is also not working, despite all instructions followed correctly - I'm 100% sure of this.
I have then desoldered the chip, backupped the contents, and tried to earease the chip in order to program stock image, but the chip is locked by status registers SREG2 (TB) and SREG6... -
Common SPI bios chip programming Questions and Answers
----------------------------------------------------------
Q: I have a bios request,i can`t post my backup as i can`t read from the chip.
A: If you can`t read from it how do you expect to write to it ?.
Q: Why is my bios chip unreadable ?.
A: The programmer is faulty or has a worn or broken zif socket.
The USB cable is frayed,connector pins worn or some other physical damage.
Not enough amperage or voltage to power the programmer properly.
Bad...09-02-2021, 04:40 PM -
Hi all,
got a latitude off of a old colleague which is stuck at 5v and not turning on no signs of life.
ive done some digging and it seems like pu4501 (5193 ti 1a8 adgh is the chip markings) is shorted. Getting up to around 74c. Haven't removed it yet because i haven't been able to confirm what chip it is.
Googling the markings brought up only one result, tps 51396 but the markings are 51393 so I'm assuming it's a tps51393 but googling that it seems like the chip engravings are different to the one I have so I wanted to confirm whether my assumption was right... -
Long story short:
- dad converted Asus Chromebox CN62 into Windows compatible, with mrchromebox BIOS, years and years ago
- gave the computer to his son a couple years later
- son now decided to revert it to Chrome OS, to sell it as original (re-writing BIOS with the backup one created by his dad)
- too lazy to remove the board from the case, thought a voltage regulator was the BIOS chip (you know... it has 8 legs)
(seems like the story was not that short)
He used alligator clips to read the chip. No luck reading it. Removed chip and placed on a SOC-8...
Comment