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What is also strange is that on the BV the voltage on pin 2 of the pullup resistor is showed as PP3V42_G3H but on the schematic is PP3V3 coming from L7220.... May be I should re-route the jumper to the appropriate voltage rail... What's your suggestions?

Of course I did, I also measured before and after BIL connection. I suppose the SMC on pin 1 of the pullup resistor is not pulling down the SMC_LID itself. I also removed the pullup resistor and measured for PP3V3 but I got 0 volt that's why I decided to reroute a jumper to it from PP3V42_G3H as...

Last time the problem with Low SMC_LID didn't involve C4906 where on pin 1 I found PP3V3, today that voltage was missing on that cap. Isn't strange? Something related with the inner traces on the pcb failing or something else like smc putting to ground that signal making the traces soffering...

SMC_LID was low, I had this problem before and I fix it with a jumper between pin 2 of R5071, pin1 of C4906 and PP3V3_S5_SMC. Now the backlight is back but still have problem with slow "beachballed" performance... Takes forever to boot as well. I'll try to test sensor one more time.

Could the ROM change be the cause of the SMC failure at this stage? What could have cause the video to fail even with the original ROM chip? Should I consider an SMC replacement or is there something else am I missing?

Swapped EFI ROM with a clean one and losted video. Repalced with the original ROM and video still not showing up anymore. Now I get video only after smc bypass, what a hack !??? Couldn't test any sensor with HWMonitor because of the SMC bypass...

forgot to mention that SMC reset actually made the fan spins at maximum speed as expected. As far as I know, sensor issues cause fan spins faster and in my case this doesn't happen. May be the issue is not related to a sensor but only the smc? Is there a way to know it for sure?

I got this previous liquid damaged machine back after 6 months of normal usage. The machine runs slow at boot and after logon as an effect of a sensor failure perhaps. The camera seems to work, the only strange thing I noticed in the beginning were some spikes on video using photo boot. I also...