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...
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...
Renesas H8S/2112 R4F2112 R4F2112R - 16-Bit Single-Chip Microcomputer Datasheet
H8S Family / H8S/2100 Series
Ordering codes:
F2112TE25V F2112BG25V F2112LP25V
The core of each product in the H8S/2112 Group of CISC (complex instruction set computer) microcomputers is an H8S/2000 CPU, which has an internal 16-bit architecture. The H8S/2000
CPU provides upward-compatibility with the CPUs of other Renesas Technology-original microcomputers: H8/300, H8/300H, and H8S.
As peripheral functions, each LSI of the group includes a serial communication...
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