Lenovo legion 5-15ach6h IT8227E-192 CXA shorted, repaired but no screen / no boot

[pappothar]

hi
i bought a defective legion, tested it had the IT8227E-192 CXA shorted.
I ordered on aliexpress, carefully changed it under microscope, and now when i plug the dc in, keyboard flashes in all colors in loop, on button is white, and nothing more
The battery led is charging, it seems is the only thing that works
Screen is off, nothing, not even the backlight
could it be a non programmed IT8227E ?
Awaiting for your feedback
Thank You
Stefano

[pappothar]

hi
i bought a defective legion, tested it had the IT8227E-192 CXA shorted.
I ordered on aliexpress, carefully changed it under microscope, and now when i plug the dc in, keyboard flashes in all colors in loop, on button is white, and nothing more
The battery led is charging, it seems is the only thing that works
Screen is off, nothing, not even the backlight
could it be a non programmed IT8227E ?
Awaiting for your feedback
Thank You
Stefano

bump

[Davi.p]

if the chip you replaced is programmable, surely it needs reprogramming, but about the soldering job are you expert enough to say it is right? How is the package? Qfn? bye

[reformatt]

Unless your supplier specifically programmed it for the model you are replacing it on, it will be blank. You need to program it with a SVOD or similar via the keyboard connector (or 128 pin ZIF socket prior to installing). Some Lenovo's have a split EC and KB design, and require programming via JTAG connector. Depends on the motherboard, which you didn't specify.

EC failure on these laptops is usually due to a broken DC input jack sending 19V down the ADAPTOR_ID line directly to the EC. So you need to make sure this is ok first, otherwise you destroy your new EC

[DeXXter]

Lenovo legions need a programmed EC, it won't program iself. And prepare yourslef, because that's maybe not the main issue, most probably a technician was checking the laptops and shorted the 20v rail with the id pin. Happened to me with a legion 5 pro, in the end it had a lot of issue, along with a missing clock signal on cpu, had to reball the cpu and not even that fixed this damn laptop.