Looking for help with dead onboard ram

[Kukzi]

Hello,

I have a laptop that I wish to save, so I came here looking for help.

The onboard ram is dying but there is a slot for removeable ram which I would use if I can disable the faulty one.

Laptop information:
Acer Aspire A515-56
Model Number: A515-56
Serial Number : NXA1EEX008046015773400
https://www.acer.com/us-en/support/p...08046015773400

Information from the motherboard:
Vendor: ChuanYi
FH5AT LA-K091P
Rev: 2.0
2020-09-11


Hopefully I could move a component on the motherboard to disable the ram ? (don't know enough to figure it out myself)
Also read that an option is to modify the BIOS, but from what I understood some hardware is required for that, which I don't have.

What are my options? Would appreciate any help,
Thanks in advance!

[mcplslg123]

https://www.badcaps.net/forum/troubl...tic-board-view

Schematic+Boardview.

Page9 of the schematic has info to disable onboard ram.

If you cant figure out on your own, mention the ram markings here for solution.

[Kukzi]

First of all, thank you for giving me pointers where to start.

And I should probably say again that I really have no clue what I am doing, I am assuming most of the things.

Sent the pictures of the chip and the area where I think the components are that need to be moved.

I would guess these are the components that need to be moved:

RC3997 -> RC3992
RC3993 -> RC3990
RC3995 -> RC3994
RC3996 -> RC3991

Please let me know if any of this is correct and if not what would I need to do.

Thank you!

[mcplslg123]

No. Totally wrong resistors you've chosen.

RamID1 and Ramid2 will remain unchanged.
Ramid0 and ram id3 resistor should be moved to make it logic level 1.(shift RC143 to RC142 and RC50 to RC49)

Your onboard ram is highligted on the 7th row from top in the ram id table on pg9 of schematic.

[Kukzi]

On the boardview file from the link in your first reply named "Compal LA-K091P Rev 2.0 BoardView" I can't find RC50 and RC49.

[mcplslg123]

Yeh just noticed the discrepancies. Dont know which one is to beleived-the schematic or boardview. The schematic shows something which bdv just doesnt shows and bdv shows something which schematic doesnt show.
Seems like either of the two is not specific to this board.

Going by the boardview,
Shift the following
01.RC3997 -> RC3992
02.RC3996 -> RC3991

does it helps? Please confirm

[Kukzi]

Yes it helps, I will attempt it when I have a bit more free time since the components are much smaller than I expected.

There is one thing I still don't understand so if you could explain it ?


Looking at the ram table based on the ram type I got (H5AN8G6NCJRVKC) all positions are at "0" and for no onboard memory all of them would have to be "1" ?
Or is this not what the table represents ?

Thanks again for all the help.

[mcplslg123]

Going by the suffix "VKC" it does seems like hynix 4gb and not 8GB as i assumed.
As long as the suffix on your onboard ram is VKC and its 4gb hynix, then proceed with what you listed at post#3.

My apologies for not looking carefully enough for the suffix.