dag3bembcd0 rev d Board view and Schematic needed for Non Graphic Conversion (DIS to UMA) as the Graphic chip is bad
-
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... -
Hello everyone, I have never flashed a bios before and currently find myself needing to flash a new Winbond W25Q128JVSQ chip without the original bios file.. I have a CH341A programmer and have been able to connect the chip to neo-programmer, but that's about as far as my knowledge takes me so far. When i read the chip the data appeared to be all FF for every entry.
I do not know the history of the motherboard, only that the old chip was removed because it was dead apparently. When the on button is pressed, the laptop on battery alone just shows a solid white light on the side and same on... -
Hi there,
I need some help reverse engineering a BMS chip from a battery for an xx30 thinkpad. The Laptop uses a challenge-response type of system to verify if a battery is genuine:
The laptop writes four bytes to 0x3C and then reads 0x3C. The battery responds with "Lenovo JapanXXXX", with the Xs corresponding to four response bytes. For example "0xDC 0x42 0x5B 0x82" to BMS => "Lenovo Japan0x9F 0x76 0x97 0x2E" from BMS.
What I know so far:- It's an 51F51 BMS chip based on the R2J24020F group. Karosium has already figured out how to dump
-
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... -
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