latitude 5420 board LA-k491P bios problem.

[LBTT1121]

Hi there!
I have a Dell Latitude 5420 / ST: FC2JQF3 / GDF40 LA-K491P / Rev: 2.0 (A01) / 2020-11-16 / i5-11 model.

My client told me it ran out of battery while updating BIOS (yes, it did) and now seems more like a brick.

I have some doubts about this one:
It charges using a USB-C plug adapter and I have an asymmetric power source to see the consumption.
I don't know if I can plug it in 20V.
When plugged on 5V and when I try to raise it to 20, it turns out on 7V.
The original adapter is here with me, but It only shows a tiny white light and it's working fine.

I tried:

• Flash BIOS (UC2)
• Flash EC (UT7)

None of this worked.
But the behavior is always the same, before and after flashing: when I plug the adapter (5V), it consumes a variable amount of energy: 0.40 / 0.52 / 0.61 / 0.30 and keeps variating.

The original BIOS is attached here and also the EC.
I also added the boardview.cad and schematic to help.

Can someone help me to find the solution?

try and feedback

[joaopedrogallo]

Hi there!
I have a Dell Latitude 5420 / ST: FC2JQF3 / GDF40 LA-K491P / Rev: 2.0 (A01) / 2020-11-16 / i5-11 model.

My client told me it ran out of battery while updating BIOS (yes, it did) and now seems more like a brick.

I have some doubts about this one:
It charges using a USB-C plug adapter and I have an asymmetric power source to see the consumption.
I don't know if I can plug it in 20V.
When plugged on 5V and when I try to raise it to 20, it turns out on 7V.
The original adapter is here with me, but It only shows a tiny white light and it's working fine.

I tried:

• Flash BIOS (UC2)
• Flash EC (UT7)

None of this worked.
But the behavior is always the same, before and after flashing: when I plug the adapter (5V), it consumes a variable amount of energy: 0.40 / 0.52 / 0.61 / 0.30 and keeps variating.

The original BIOS is attached here and also the EC.
I also added the boardview.cad and schematic to help.

Can someone help me to find the solution?

[Markus1741]

same error

Sorry but just cleaning the ME region does not fix the TPM error, only replacing the TPM IC helps, anything else is nonsense .....

[ezazuk]

hi, need help to remove TPM error:
TPM DEVICE IS NOT DETECED
DELL LATITUDE 5420-I7-11GEN
SERVICE-TAG-8ZQHR73
try

same error

[LBTT1121]

hi, need help to remove TPM error:
TPM DEVICE IS NOT DETECED
DELL LATITUDE 5420-I7-11GEN
SERVICE-TAG-8ZQHR73

try

[ezazuk]

hi, need help to remove TPM error:
TPM DEVICE IS NOT DETECED
DELL LATITUDE 5420-I7-11GEN
SERVICE-TAG-8ZQHR73

[aamkaachaar]

Hello this is not your original file you say ServiceTag is 6LYQ2J3 but in your file it is BCYC1J3 ?????????
And ServiceTag 6LYQ2J3 coud not be found!!!!!!!!

Sir i have provided the service tag written on the backcase , may be the backcase has been swapped by someone but the bios file i have provided was intact bios for the machine ... if you can help me with a good bios for BCYC1J3 , things would help

[Markus1741]

My Bios is Corrupted , It's just parttial power on , no (Run_on) supply , tried with CLR ME, and Even With New Bios Region, Same condition , with some other bios here it gets powered on but Some RGB color , Some loop restart , Some hang on Dell logo , i am attaching my origional dump if someone can help ?
Latitude 5420
ST:6LYQ2J3

Hello this is not your original file you say ServiceTag is 6LYQ2J3 but in your file it is BCYC1J3 ?????????
And ServiceTag 6LYQ2J3 coud not be found!!!!!!!!

[aamkaachaar]

try and feedback

Still the Same , Partial power on EC doesn't releases (Run_on_en), Draws 100ma Current only, I have already tried with clear ME and NEw Bios Region the Condition Doesn't change , Any Further Help Would be appreciated .

[LBTT1121]

My Bios is Corrupted , It's just parttial power on , no (Run_on) supply , tried with CLR ME, and Even With New Bios Region, Same condition , with some other bios here it gets powered on but Some RGB color , Some loop restart , Some hang on Dell logo , i am attaching my origional dump if someone can help ?
Latitude 5420
ST:6LYQ2J3

try and feedback

[aamkaachaar]

My Bios is Corrupted , It's just parttial power on , no (Run_on) supply , tried with CLR ME, and Even With New Bios Region, Same condition , with some other bios here it gets powered on but Some RGB color , Some loop restart , Some hang on Dell logo , i am attaching my origional dump if someone can help ?
Latitude 5420
ST:6LYQ2J3

[peste]

hey i got a latitude 5420 LA-K491P Rev: 2.0(A01) that is bios locked ST:H1GN6D3

try...

[Nrg1knight]

hey i got a latitude 5420 LA-K491P Rev: 2.0(A01) that is bios locked ST:H1GN6D3

[LBTT1121]

Unlock PLZ
ST:BY0X4M3
Dell 5420 REV: 2.0
LA-K491P

try

[mdalamin]

Unlock PLZ
ST:BY0X4M3
Dell 5420 REV: 2.0
LA-K491P

[erolakay]

Unlocked ...

I'm grateful to you.
Thank you very much.
Problem solved.

[Markus1741]

Need help please
Dell 5420 LA-K491P Rev : 2.0(A01)
ST : 6VY86M3
can anyone unlock this BIOS?

Unlocked ...

[erolakay]

Need help please
Dell 5420 LA-K491P Rev : 2.0(A01)
ST : 6VY86M3
can anyone unlock this BIOS?

[SMDFlea]

TPM no error, but not detech SSD , anyone help me

try this one.

[Bios White]

Latitude 5420
Service Tag: 8MVS5M3

TPM no error, but not detech SSD , anyone help me