No display on Xbox one s

I have an Xbox one s with no display I changed the hdmi port and I still get “no signal” on the tv. I reflowed the retimer chip and checked that I still get continuity across to relevant pins on the hdmi port which I do.

I also checked some voltages and don’t have 5V on pins 18 and 19 when console is powered on and hdmi is connected to the tv.

Can anyone advise if they have had a similar problem and also how to check if the retimer chip is broken.

Thanks Liam.