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Hi MAcbookPro 820-00138-A has no image/display, only once i got just backlight flash. CPU is getting very hot. No external display. PPBUS_G3H-12.67V Getting PP3V3_S5- 3.3V PP5V_S4- 5V L7330, L7320, L7310 has 1.7V and 12 Ohm. PP1V5_S0- 1.5V PM_SLP_S4_L- 3.3V PP1V35_S3RS0_CPUDDR- 1.35V PP1V05_S0-...

Tried installing Window 10 but no luck same response. Booting properly without TPAD. But when connects TPAD, shut downs in few seconds and reboot.

do i Give Up or try something else?

No Luck tried both but same behaviour.

can i please get the fress bios for this machine? i tried to download from other sources that is having size problem keep saying does not match the chip size.

While only TPAD connected these are the values i get TPAD_SPI_INT_L- 3.32V TPAD_SPI_IF_Conn- 3.32V SMBUS_SMC_3SDA-3.32V TPAD_SPI_CS_L_CONN-5.1v PP5V4_TPAD_CONN-5.1V SMC_PME_S4_WAKE_L-3.2V SMC_ACTUATOR_DISABLE_L-3.2V KBD_INT_L-3.3V TPAD_SPI_MOSI-0V TPAD_SPI_CLK_CONN-0V KBD_I2C_SCL-0V...

Connected TP only. No KB. U4540 Pin 4- TPAD_SPI_INT_L- 3.32V U4520 Pin 4 - TPAD_SPI_IF_Conn- 3.32V these signal stays at these value. i didn't find any change.

didn't find any issue in that area. i am getting following values Q4530. pin 3- TPAD_SPI_CS_L_Conn- 3.28V U4540 Pin 4- TPAD_SPI_INT_L- 3.32V U4520 Pin 4 - TPAD_SPI_IF_Conn- 3.32V

Did the new MacOS install and PRAM reset as well several times. No boot loop with Keyboard connected and TP not connected. but there is no activity on keyboard.

yes i tried both one by one, still was doing same boot look.

Hi Macbook A1707 820-00281-A have boot loop with internal KB and TP. But it boots normally without KB and TP. External KB and mouse works fine. I also checked with new Topcase with new KB and TP but still same issue. There is no liquid damage on the board, looks very neat and clean. I have also...

Hi I checked with different battery. PPBUS_G3H is increasing gradually from 12.10V upto 12.65V slowly.

initially PPBUS_G3H was 12.72 and then suddenly jumped to 12.93V. tried 2-3 time but jumping directly from 12.68V to 12.93V and further no increase in PPBUS_G3H.

Yes, Battery is charging well. It is taking normal current to charge the battery approx 1.2 Amp to 2 Amp depends

C7020 and C702 both has 2.6 Ohm between both ends.

First of all, Thanks Vali for your help and guidance. there is no external video or USB activity with battery connected. These are the CPU voltages which i check with battery connected and without battery, didn't found major difference. PPVCCGT_S0_CPU--0V PPVCC_S0_CPU-- 1.132V (without battery...

Tried SMC bypass mode nothing happened. Diode mode values on C7020- .455V on both ends and C7023- .0545V. SMC_DCIN_ISENSE-0V. SMC_BMON_ISENSE- 0V.

I have checked each and every single component on board, there is no liquid damage, rusted or loose soldering component. device shows display without battery and also acting with Command+R going for recovery.

Hi I have tried Revive and Restore both in DFU, After finish line each time i got the second image. System not booting at all. nothing on screen. But when i unplug the battery and booted with charger only , ?mark was there on screen.

Hi Macbook Air 820-01521-2 has no display with battery. i have checked with different battery also but got same response. i am getting display on external and internal both without battery. there is no liquid split sign on board or damaged component. Also checked with two different good screens...