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Hi. I have this A1708 no power draws 5v 0.020-0.030 range. This one I fixed 2 years ago and replaced U2800 and also one of the type c controllers. This time I re-balled U2800, and didn't work so I changed it from another board, and still the same. No short circuit on the board.

Yes as usual. I replaced also UP710 because there was around it some liquid damage. Also there was some corrosion on the Audio circuit, but not sure if that can affect the image and backlight.

PP3V3_SW_LCD_CONN 3.3v but it drops LPDP_INT_HPD 1.1 v and it drops RP620 no corrosion all clean there

UP710 measurements pin 1 VDD 1.8v stable not losing voltage pin 2 LCD_PWR_EN I get 1.8v and loses voltage when it's going to flash the logo pin 3 PMU_SYS_ALIVE 1.2v stable not losing voltage pin 4 EDP_PANEL_PWR_EN 1.8v and then losing voltage pin 10 EDP_PANEL_DISCHARGE stable at 1.8v pin 11...

I have a connection from K pin on DP800 to RP831 pin 1

All good doide measurements there

Yes, I tried a brand new LCD. It shows a picture with the backlight normal for a second and then loses all

Hi. Any ideas please?

I have this A2338 it was liquid damage in multiple places on the board. I removed the corrosion, resoldered all broken connections, and rewired some. The laptop is powered on but the backlight comes on for only 1sec and turns off, and still running and boots up on external. I replaced UP800...

Thank you for being so helpful, I appreciate it :)

It seems like only solution is CPU Reball or Replacement

The MacBook powers on and works normally on an external monitor, so maybe just that trace is missing and that's why I also don't get EDP_BKLT_EN

EDP_AUXCH_N only goes to R8503 pin2 and then CPU

EDP_AUXCH_N - OL EDP_AUXCH_P - 0.219 EDP_ML_N<0> - 0.210 EDP_ML_P<0> - 0.216 EDP_ML_N<1> - 0.216 EDP_ML_P<1> -0. 216 EDP_ML_N<2> - 0.216 EDP_ML_P<2> - 0.216 EDP_ML_N<3> - 0.216 EDP_ML_P<3> -0.216 EDP_PANEL_PWR_BUF_EN - 0.574 DP_INT_HPD - 1.611 EDP_BKLT_PWM - 0.788 PP5V_S0SW_LCD - 0.544...

I replaced the backlight chip and wired 1.8v from LID_OPEN_LEFT to LID_OPEN_RIGHT , and still the same. SMC_LID_LEFT/RIGHT are 1.8v also as they were even before

No problem, I will try. In the meantime, the backlight chip decided to stop working and shorted half of the board. I need to replace it and try again. No short when the backlight chip is removed. I will update asap

Because R4805 is removed and on pin 1 I have 0.85v, and on pin 2 I have connected R4804 pin 2 which has 1.8v. You said to remove R4805 and connect pins 1 & 2 of U4802

I just rechecked now and LID_OPEN_RIGHT stays at 0.85v even when pins 1 & 2 of U4802 are connected. All other signals are 1.8. LID_OPEN_RIGHT goes to U6650, but no info about the chip on the schematics. Not sure if U6650 is on the board, under the shield which covers U7800.

Yes all of them are 1.8v

I tried still the same :)