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I'm very sorry, I thought it could be related to vram because scoopof3d on youtube had similar issue on a compareable model and replacing vram fixed it for him, ill try and find the video edit: here is the video https://www.youtube.com/watch?v=ANwi3UwTTfE&t=248s again, im very sorry

He probably means 3662, I am having the same issue coincidentally on the same model

I have an 820-3662 that was liquid damaged. I had to replace the keyboard IC because the V,B,N,M, , , keys were not working despite changing the keyboard. After changing the IC it was working but the keyboard backlight didn't work even though the system would let me turn it up or down. After...

You're correct, something is pulling ppbus down to 500ohm resistance to ground. I'm going to look around the line until further instructions EDIT: I have 12.3v on ppbus now and amber light without battery, it turned out to be a bad ISL6259 solder job or IC... still no fan spin or power seems...

So I think I figured out how to use the oscilloscope, since I am able to get accurate readings on the lines that work. 5v_s3 seems to remain at 0v, i've tried various trigger settings and sec/div

I didn't detect any spikes with my multi meter, which is usually pretty decent. I have a really old oscilliscope but I don't really know how to use it. Its a tektronix tas 465, ill try to figure it out and update

Sounds like a VRAM issue

Is the drive encrypted?

51125 getting slightly warm when plugged in... replace?

Moderate liquid damage on board, above and under. R6920(47ohm resistor), Q5490(DCIN_S5_VSENSE) and ISL5269 were fried, replaced and got a green light. I thought these boards were supposed to be amber when no battery is present. Anyhow, if I attach a discharged battery then it turns amber and...

EDIT: Deleted

820-2936 No visible liquid damage. No prior history available. Came from another shop, found some components knocked off and replaced them(C7981 - CPUVCCIOS0_EN, D5802 – PP18v5_S5_R, and C4520 – SATA_ODD_R2D_C_N) I get green light, charges battery(amber), smc reset functions. No fan spin or...