Hacking Bricked Switch, No charge, does not respond to payload.

[coolikot]

Hello Everyone,

I would just like to ask if anyone has any other ideas to fix this tablet I won at a local auction.

Current Status:
-No display, stuck in black screen, backlight on
-Does not charge
-USB multimeter reading at 4.99v 0.4A
-Gets detected by TegraRCM in the PC(oddly enough automatically)

Things I have checked
-Checked all caps, no shorts in the board
-Tried holding power up and volume for the freezing fix = no response
-Responds to certain payloads but only at black screen.
-Hekate, Atmos = no response, SX OS, Memloader, lockpick, switchboot = backlit turns on but stays that way, no further display
-Tried a good board on the said switch, battery, digitizer, screen is Okay
-Tried the board with issue in the other parts(known good battery, screen, digitizer) = same no response.
-Unplugged battery, connected to PC = detected by TegraRCM
-I currently Have the BisKeys using Lockpick,
-Full Nand Backup using NxNANDManager
-Questionable Boot0/1 using memloader, and dumped it via win32diskmgr
-Tried @mattytrog's unbrick my switch but still nothing
-Entropy Checks out with with the keys but still nothing nothing after the OS recovery.

Do you have any ideas what else I can check? Your inputs and help are appreciated.



Thank you.

 

[linuxares]

USB multimeter reading at 4.99v 0.4A - to me, this sounds like it's actually working but something with the screen (display cable) is broken.

Also it sounds like this () - https://www.tronicsfixforum.com/t/charging-after-usb-c-port-replacement-black-screen/953/2

 

[coolikot]

USB multimeter reading at 4.99v 0.4A - to me, this sounds like it's actually working but something with the screen (display cable) is broken.

Also it sounds like this () - *hyperlink removed new user*

Thank you for the response. 4.99V 0.4A is normal slow charging, mine unfortunately doesn't charge correctly as it stays at 0.4A it should go to 0 then go to 1.7A but I am not seeing that but I will try to check the pins in the board.

 

[The Real Jdbye]

Thank you for the response. 4.99V 0.4A is normal slow charging, mine unfortunately doesn't charge correctly as it stays at 0.4A it should go to 0 then go to 1.7A but I am not seeing that but I will try to check the pins in the board.

It will not fast charge while in RCM. You would have to boot into HOS blind to see if it will fast charge.

@linuxares' idea seems plausible. Have a close look at the LCD connector on the motherboard, make sure the pins are clean and shiny and nothing is bent or broken.