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Check UC120 voltages.

Install macOS Tahoe (if possible) and try to recalibrate LAS.

That points to CPU graphics problem. Seems that was affected by voltage spikes, when removing video cable (with power connected).

Check IPD_LID_OPEN_1V8 and AMR_LEFT/RIGHT_OR_ND_1V8 signals.

You should always get correct external image when internal LCD is disconnected. If not, CPU is suspect.

So doesn't turn on at all with charger alone? Check UPC_I2C_INT_L and UPC_SMC_I2C_INT_L levels.

What said the customer about fault appeared? Did you test with charger alone (96W)?

99.9%...

Short on two different power rails, with NANDs as common point, guess what?

Do you note any short on the power rails of these chips?

I expect the machine works with lid sensor disconnected. However, I'm not sure 100% about new models behavior. CPU's LPDP_INT lines should be protected by CP610-9 series capacitors. If all power rails of JP600 are good, you may have problems with the other lines; right side of the connector, in...

"EDP_BLC_5V_EN should be 5v right?" Why do you think that? Don't confuse enable signal with the output voltage! UP710 is powered from 1V8_S2, will not accept overvoltage on any pin. I think 1.2V should be good enough for lid signals. You can try forcing to 1.5-1.8V, just in case...

T-CON should be good, if you already tested with known good LCD assembly and problem persists. As I said, check diode mode to ground on all EDP lines.

First of all, welcome to the forum! EDP_PANEL_1V8_EN must be high, in order to enable T-CON. 3V3_SW_LCD, 1V8_S2 and 1V25/5V_SW_MINNIE must be all present. CPU requires from LCD to pull-up (to 1.2V) the LPD_INT_HPD signal. If you don't have same working board for comparison, you can use online...

You should test with known good battery, even old one. "New" chinese batteries can cause weird issues.

Try replacing/reflashing other too...

The owner has that machine registered on his account? There should be an option to reset password online, from the account.

Check diode mode to ground on EDP lines and compare with good board; w/ and w/ LCD connected.

Did you replace all TBT ROMs, or just UF260?

Disconnect LCD connectors one by one; camera, backlight, EDP.