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Using original MS2

3V3S5/SUS is a Stable 3.3V PM_BATLOW_L: 3.3V PS_DSW_PWRGD: 3.3V PCH_DSWVRMEN: 3.2V PPVRTC_G3H: 3.3V RTC_RESET_L: 3.3V PCH_INTERVRMEN: 3.2V PCH_INTRUDER_L: 3.03V PCH_SRTCRST_L: 3.3V

Will check that, tried new LCD and cable to no avail. Thinking about replacing U9000.

So I have an 820-3437 drawing .100A and is missing ALL_SYS_PWRGD. PP5V_S4RS3 is missing, in fact , it seems I am missing all 4 PGOOD signals. No sign of liquid damage.

all three resistors measure o ohms, DP_INTRNL_HPD stays at 3.3V

Got an 820-00244 on the bench that suffered liquid damage on a couple parts by the CPU. They were slightly corroded so I plugged in the LB and in started out taking 0.06A @ 19.8V. after doing some measuring, it is drawing .06A @ 5V. I measured pin 1 and 4 of Q3100 and they are 11.1V and 7.24V...

I can confirm this issue is resolved by installing a known good battery. after my own testing, the computer will boot loop without a battery installed, but will boot fine without TPAD cable plugged into LB. Iv'e now had this on 3 devices. I know this is an old thread but I thought it may help...

VIDEO_ON_L goes from 3.3v to .08v as LCD and 4th LED turns on turns on, then after 10 seconds screen goes off and it goes back high

So VIDEO_ON_L is 3.3V. Going to measure with LCD plugged in to see if it changes

When I power it back up that is...

Now I turned it off and the screen won't come back on.

So I put a new inverter board in and it seems to be working, though every once in a while the screen will go black for half a second then come back on. Trying to get password to check temps with HW Monitor

I did. Going to try new inverter board next

I miss-spoke. I meant to say I have an INTERNAL display problem.

Got an 820-2828 with an external display issue. My customer replaced the GPU but couldn't get it to work. I got it and took it apart and reassembled it carefully and it started to work. I gave it back to the customer and they gave it back to their customer. It has been returned for not working...

No history, No corrosion that I could see. I cannot get to disk utility because it will not see USB either. I will try a couple other SSDs and post voltages soon.

Hey, got an 820-00165 on the bench that posts to a flashing "?" folder, but will not recognize SSD. When I try to use External USB it will not show up. Two things I noticed were it draws about .700 to .9 A and the CPU gets super hot. Not sure where to start with this one.

Ended up putting a new SSD in it

I meant to say I was able to get it to run Catalina on an external USB SSD

Original SSD was inside. After a few tries of it restarting I got it to work but it is running slow. The CPU is really hot. HW Monitor shows the CPU is consuming 3 watts, not sure if that is a normal thing.