The Samsung S49CG934SU monitor does not power on - no LED indicator activity and no response to power button. However, when 21V power is connected, it immediately draws 0.8A of current with no display output. The motherboard processor gets warm, and there is continuous reading activity from the W25Q128BV BIOS chip.
Suspected Cause:
I suspect the BIOS may have been corrupted during a power interruption while updating the firmware. The official website provides firmware updates, but they can only be installed via USB flash drive.
Troubleshooting Attempts:
No hardware faults were found during physical inspection
Attempted to integrate the official firmware into the original dump using ChatGPT
Achieved only temporary LED illumination (5 seconds) in a repeating cycle, which further suggests BIOS-related issues
Additional Notes:
The current symptoms indicate potential BIOS corruption rather than hardware failure. The partial response after firmware modification suggests the repair path might involve:
Finding a clean BIOS dump.
Would appreciate any advice on:
Where to obtain a verified BIOS dump for this model? Attaching the original BIOS dump from IC802 chip.
Additionally attaching:
Firmware dump from IC801 (EEPROM 24C512)
Modified BIOS generated by ChatGPT (this version successfully activated the power LED indicator)
And I also added the official firmware file
Suspected Cause:
I suspect the BIOS may have been corrupted during a power interruption while updating the firmware. The official website provides firmware updates, but they can only be installed via USB flash drive.
Troubleshooting Attempts:
No hardware faults were found during physical inspection
Attempted to integrate the official firmware into the original dump using ChatGPT
Achieved only temporary LED illumination (5 seconds) in a repeating cycle, which further suggests BIOS-related issues
Additional Notes:
The current symptoms indicate potential BIOS corruption rather than hardware failure. The partial response after firmware modification suggests the repair path might involve:
Finding a clean BIOS dump.
Would appreciate any advice on:
Where to obtain a verified BIOS dump for this model? Attaching the original BIOS dump from IC802 chip.
Additionally attaching:
Firmware dump from IC801 (EEPROM 24C512)
Modified BIOS generated by ChatGPT (this version successfully activated the power LED indicator)
And I also added the official firmware file
Attached Files