Did battery repair, now no display on internal screen or HDMI

Any suggestions appreciated. Have done PRAM and SMC reset.

Hear chimes on reboot.

Have attempted removal and reconnection of display screen connector as well as all other connectors with no improvement.

Have already attempted display brightness adjustment - no benefit

Per subject, have attempted connection of extern HDMI monitor thru HDMI jack on right side of MBP. No display.