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I checked the audio board on the machine, it's perfectly clean. There was some liquid damage from hot chocolate on the board around Q7660 which has been cleared, and near C6481.

Hi I got an 820-01958. PPBUS_G3H is 12.6v, PP5V_G3S is 5v, PP3V3_G3H is 3.3v. PVDDCPUAWAKE_SW0 to SW3 are 0.75v, PP0V82_SLPDDR is 0.82v, PP1V8_SLPS2R is 1.8v, , PP1V1_SLPS2R is 1.1v, PP0V9_SLPDDR is 0.9v, PPVCCQ_ANI_SSD0 is 1.8v. PP1V05_PCH_EXT_REG, PPVNN_PCH_EXT_REG, and PPVCC_CPU_PH1 to PH3...

Thank you for your assistance.

The ohms reading is 2ohms compared to 100ohms on another board.

This board was cleaned up before I got it and was told there was some water damage on the underside. There looks like there my have been liquid around U7210/U7220/U7230. All 3 coils L7210/L7220/L7230 read on diode model -0.001v. Am I correct in assuming the Cpu is fried? before I spend more time...

Thanks for your input again. There was no connection between R6118 and R6130, ran a jumper wire and usb activity kicked in and posted.

PLT_RESET_L, = 3.3v CPU_VCCST_PWRGD = 1.01v CPU_VR_READY = 1.05v

I have a A1508 16gb board number 802-4924-a here with no USB/Cpu activity. No sign of spillage on the board. It drawing 370ma with fan spin . Not sure if its normal for these board to reboot twice?. All power rails are present. SYS_PWROK_R = 3.42v CPUVR_PGOOD_R = 3.3v PM_S0_PGOOD = 3.42v...

Update. I replaced the Smc for a second time and audio now works. Thanks for your assistance.

Any other ideas?

1.5v same on working board

Those resistors measure and look fine. This came with no sound, no evidence of spillage. No audio hardware in OS.

No evidence of spillage. I tried good i/o cable and board but still no Audio. Os does not see any audio device. checked J9500 under microscope for bad connection. AUDIO_PWR_EN 3.3v PP1V5_S0SW_AUDIO 1.5v I also replaced U8040 .

When I remove U8500 it stays at 120mv and ppbus_g3h is at 8.12v. U1950 SYS_PWROK_R = 3.3v CPUVR_PGOOD_R = 3.3v ALL_SYS_PWRGD = 3.3v PM_S0_PGOOD = 3.3v SMC_DELAYED_PWRGD 3.3v PP3V42_G3H = 3.4v

After resolder U8500 then it drops back to 20ma. I noticed U3900 was getting hot so removed it but still the same. I got PCH_HSIO_PWR_EN then 1.05v on PP1V05_S0SW_PCH_HSIO on u8500 but then it dropped back to .30ma.

Just getting back to this now. I removed U8130 and it jumps to over 200ma then back to 189 with fan running full speed.

Just waiting on decent stencil to arrive. Thanks for sticking in there. Your help is much appreciated.

No usb activity. No ram beep initially but now getting 3 beeps. And no screw damage near cpu.

Hi is there a quick way to tell if the cpu is dead on this model?. Im getting 460ma. I have tried a new clean bios from this forum but still the same. No evidence of spillage on the board. Checked termination spi resistors also. L7310/L7320 have 1.8v L7630 has 1.05v PM_PCH_SYS_PWROK 3.4v...

U5850 is not on this board around the area looks ok. I checked caps and resistors and traces around U5870 no issues. I removed Q5871 and it runs even slower to a crawl. I swapped the SMC in case it was having an issue but still the same.