Latitude 7420 - BIOS repair possible?

[Mirenia]

Hi,
I finally got managed to desolder my BIOS-Chip and create a dump.

My Latitude 7420 won't post, but keyboard-backlight and fans are on.

Mainboard: GDC31 LA-K371P Rev:3.0(A02)
BIOS-Chip: Winbond w25r256jv
Service-Tag: 9SWP2J3

Can you please have a look at it and maybe fix it?

[qayyum786]

Hi,
I finally got managed to desolder my BIOS-Chip and create a dump.

My Latitude 7420 won't post, but keyboard-backlight and fans are on.

Mainboard: GDC31 LA-K371P Rev:3.0(A02)
BIOS-Chip: Winbond w25r256jv
Service-Tag: 9SWP2J3

Can you please have a look at it and maybe fix it?

do you have image on external monitor/tv via HDMI or on USB KEYBOARD CAPS LOCK LIGHT BLINK when you press caps lock on keyboard

[Mirenia]

do you have image on external monitor/tv via HDMI or on USB KEYBOARD CAPS LOCK LIGHT BLINK when you press caps lock on keyboard

Nope, no image on external monitor. Capslock on internal keyboard lights up permanently. External Keyboard is not recognized.
I already tried flashing BIOS with a bootable USB-Stick (solution from Dell support page) and NVRAM-Reset. But nothing works

[Vesko356]

It's under highest Dell support service plan "Pro Support Plus" until 26 SEPT 2024. It's best to contact the manufacturer first for a warranty repair before you've made things worse by trying to do it yourself.

[qayyum786]

your posted bios is 65 mb it should be 32 mb only

Read and post again

[Mirenia]

your posted bios is 65 mb it should be 32 mb only

Yes, I also suspected that my BIOS file is much too large.
But it is exactly what I read out of the chip using the programmer.

So is this maybe a mistake of my programmer or is something really wrong with my BIOS?

[Vesko356]

https://www.badcaps.net/forum/troubl...35#post3210235

[Mirenia]

Vesko356 The Laptop was gifted to me. So I had no proof of ownership and unfortunately no longer contact to the gifter.
Do you think I can try to contact the support despite it?

[Vesko356]

Yes of course. At least try, it's possible they won't ask you for any papers, besides the warranty support level is highest possible as I said, and the location of the warranty is exactly in Germany.

[hoaca388]

your posted bios is 65 mb it should be 32 mb only

Read and post again

His bios is repeated at bit 2000000h.

[qayyum786]

His bios is repeated at bit 2000000h.

yes you are right i got it

[qayyum786]

Service-Tag: 9SWP2J3

Try

[Mirenia]

Thanks a lot!!!!

I flashed the chip with your file and soldered it back onto the board.
But now the laptop seems completely dead. Only the LED lights up in red as long as I press the power button.
No charging and no reaction.
Maybe I shorted/damaged something while soldering (I will check this tomorrow)

P.S: I am a she and not a he

[devp62]

My Latitude 7420 won't post, but keyboard-backlight and fans are on, power led is white and stays white no flash codes, was working until it did a bios update and hasn't come back up.
Can some one please help me clean the file. Thanks

Mainboard model no is GDC31 LA-K371P Rev:3.0(A02)
BIOS-Chip is a Winbond w25r256jv
Service-Tag: J2JRCB3

[rex98]

My Latitude 7420 won't post, but keyboard-backlight and fans are on, power led is white and stays white no flash codes, was working until it did a bios update and hasn't come back up.
Can some one please help me clean the file. Thanks

Mainboard model no is GDC31 LA-K371P Rev:3.0(A02)
BIOS-Chip is a Winbond w25r256jv
Service-Tag: J2JRCB3

here use this

[devp62]

Thanks Rex98 all up and running again

[devp62]

Dell Latitude 7420 won't post, but keyboard-backlight and fans are on, power led is white and stays white 3amber and 6 white flash codes, was working until it did a bios update and hasn't come back up. 2 were given to me but both in same state semi power up but no display.
Can some one please help me clean the file. Thanks
Mainboard model no is GDC31 LA-K371P Rev:3.0(A02)
BIOS-Chip is a Winbond w25r256jv
Service-Tag: 57QT9K3

[devp62]

Hi I tried but get the following errors and have done several reads from the chip and they are all the same size byte by byte.

Any Suggestion or help please, have looked on line and cant find any solutions.


errors:
Error: BPDT partition SMIP (0x34A43F - 0x4E943F) overlaps with Unknown (0x34A440 - 0x4FB440)

Error: BPDT partition SMIP (0x34A43F - 0x4E943F) overlaps with SMIP (0x34A441 - 0x50B441)

Error: BPDT partition SMIP (0x34A43F - 0x4E943F) overlaps with SMIP (0x34A448 - 0x55B448)

Error: BPDT partition SMIP (0x34A43F - 0x4E943F) overlaps with RBEP (0x482000 - 0x49A000)

Error: BPDT partition SMIP (0x34A43F - 0x4E943F) overlaps with FTPR (0x4DA000 - 0x61F000)

Error: BPDT partition SMIP (0x34A43F - 0x4E943F) overlaps with PMCP (0x49A000 - 0x4DA000)

Error: BPDT partition Unknown (0x34A440 - 0x4FB440) overlaps with SMIP (0x34A441 - 0x50B441)

Error: BPDT partition Unknown (0x34A440 - 0x4FB440) overlaps with SMIP (0x34A448 - 0x55B448)

Error: BPDT partition Unknown (0x34A440 - 0x4FB440) overlaps with RBEP (0x482000 - 0x49A000)

Error: BPDT partition Unknown (0x34A440 - 0x4FB440) overlaps with FTPR (0x4DA000 - 0x61F000)

Error: BPDT partition Unknown (0x34A440 - 0x4FB440) overlaps with PMCP (0x49A000 - 0x4DA000)

Error: BPDT partition SMIP (0x34A441 - 0x50B441) overlaps with SMIP (0x34A448 - 0x55B448)

Error: BPDT partition SMIP (0x34A441 - 0x50B441) overlaps with RBEP (0x482000 - 0x49A000)

Error: BPDT partition SMIP (0x34A441 - 0x50B441) overlaps with FTPR (0x4DA000 - 0x61F000)

Error: BPDT partition SMIP (0x34A441 - 0x50B441) overlaps with PMCP (0x49A000 - 0x4DA000)

Error: BPDT partition SMIP (0x34A448 - 0x55B448) overlaps with RBEP (0x482000 - 0x49A000)

Error: BPDT partition SMIP (0x34A448 - 0x55B448) overlaps with FTPR (0x4DA000 - 0x61F000)

Error: BPDT partition SMIP (0x34A448 - 0x55B448) overlaps with PMCP (0x49A000 - 0x4DA000)

Error: Skipped EFS partition at 0x464FF0, unrecognizable format!

Warning: Could not find any File System Platform, assuming 0x01 (ICP)!

Warning: Could not find any File System Dictionary, assuming 0x0A!

Warning: Data in Engine/Graphics region padding, possible data corruption!

Note: Multiple (4) Intel Flash Partition Tables detected!

[rex98]

Dell Latitude 7420 won't post, but keyboard-backlight and fans are on, power led is white and stays white 3amber and 6 white flash codes, was working until it did a bios update and hasn't come back up. 2 were given to me but both in same state semi power up but no display.
Can some one please help me clean the file. Thanks
Mainboard model no is GDC31 LA-K371P Rev:3.0(A02)
BIOS-Chip is a Winbond w25r256jv
Service-Tag: 57QT9K3

try flash my post # 12

[devp62]

Hi Rex98 that brings the machine to life but it won't recognise the ssd and flashes 2 amber and 8 white leds. This was a working machine prior to the failed bios update. Any suggestions