A1989 Touchbar and Keyboard light stop Working

Hi Everyone
Client took Macbook to local computer shop, They replaced A1706 Screen on A1989 Model 2018, after replacing they realize screen model given was wrong, so they replaced back to A1989 Screen, Now screen is working fine, brightness is also controlling fine but after that Touchbar and keyboard backlight not working at all.
Any clue where should I start ?
Didn't found anywhere, where is the connection for touchbar , keyboard is working caps lock is working, anything common in these two connections