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I noticed Q1920 with the oxidized and bad pin 1, I replaced the component and did the retrofit. Do you have any advice on resistance checked?

OK, that also seemed strange to me but it was the measure of a functional board ... I will keep you informed

Hello, I come today with this board with which I measured good values everywhere. Only PPVCC_S0_CPU is not present So I made the measurements of U7200 which should send to PPVCC_S0_CPU CPU_VR_EN 0v OK CPU_VIDSOUT 1.04v OK CPU_VIDALERT_L 1.04v OK CPU_VIDSCLK 0.365v INSTEAD OF 1.04V CPUVR_ISUMP...

Now I have replaced U6100 3 times, I even rechecked afterwards, all BIOS works on another identical board (1.8ghz 8gb) The voltages and the diode resistors are also good when I compare with the functional board.

PM_SLP_S5_L = 0V (3.3V pulsation when I trigger) PM_SLP_S4_L = 0V (3.3V pulsation when I trigger) PM_SLP_S3_L = 0V (3.3V pulsation when I trigger) PM_SLP_S0_L = 0,052V (3.3V pulsation when I trigger) PM_SLP_SUS_L = 3,32V

And yes i have PPVCC_S0_CPU 1,8V Thanks very much for your help :)

PIN 7 = 3.17 V PIN 3 = 0.17V I had bad resistance on SYS_PWROK_R so I replaced U1950 and R1962 Now i get PIN 7 = 3.4 V PIN 3 = 3.4V PLT_RESET_L = 3.33V But still The fan is running but the board does not read USB, no LCD backlight.

Hello, As I explain in the title I have an 820-00281 board on which the XA and XB ports do not get 20V The card works on TA and TB The measures are as follows: PP20V_USBC_XB_VBUS = 5V PP3V3_UPC_XB_LDO = 3,3V PP1V8_UPC_XB_LDOA = 1,8V PP1V8_UPC_XB_LDOD = 1,8V PP1V1_UPC_XB_BMC = 0V ( diode...

Hello, Thanks for your answers, what do you call usb redriver chip? its U2800?

I am only repairing the board, in general they are poorly stored and have components torn off. ?‍♂️ This is very normal on the cards I make... Indeed PLT_RESET_L is not present (0V) BIOS replacement does not change. The problem persists

Yes PM_PWRBTN_L there is the fall and go back up right away PM_SLP_S5_L = 0V PM_SLP_S4_L = 0V PM_SLP_S3_L = 0V PM_SLP_S0_L = 0,052V PM_SLP_SUS_L = 3,32V PM_SLP rails have a 3.3V pulsation when I trigger

Hello my friend, Yes, thanks for the tip, now I am checking the coils. In my case everything is ok PPBUS_G3H = 8.48V Yes, I am using Apple original magsafe PM_BATLOW_L 3,31V SMC_RESET_L 3,39V SMC_PM_G2_EN 3,42V SMC_ONOFF_L 3,42V PM_RSMRST_L 3,25V PM_PWRBTN_L 3,41V PCH_DSWVRMEN 2,74V...

Hello, Today I am on an A1466 model 820-00165 motherboard. All voltage and resistance measurements look good. I noticed C4002 and C4003 ripped off, so I replaced. The fan is running but the card does not read USB, no LCD backlight. With thermal camera I noticed U3900 heats abnormally 46 ° C...

Hello, For this board, I saw 8.5 OHM on PP1V_S5G. On a functional card I measure 1.09k OHM I think CPU dead, I injected 1V on PP1V_S5G (I don't know if this is the right thing to do) and the CPU barely heats up. Confirm if you have another idea or if the board is for the trash? Thanks in...

Indeed I have 0.2 Ohm when I stay on it. How much voltage do you want me to inject ?

Hello, Do you know if there are solutions to check the status of iCloud lock on a non-functional mother-board? In order to avoid making repairs only to find that the board is unusable. Do you also have solutions for complete unlocking Apple ID on motherboards (no bypass solution) ? Thank you...

I mesure 0,0 Ohm 1V5 still nothing is heating ...

Thank you for your fast reply :) When I plug into USB-C A I get: CD3215 (U3200): PP3V3_UPC_XB_LDO = 3.3V (OK) PP1V8_UPC_XB_LDOA = 1.8V (OK) PP1V8_UPC_XB_LDOD = 1.8V (OK) PP1V1_UPC_XB_LDO_BMC = 0V (I THINK OK?) PP3V3_UPC_XA_LDO = 3.3V (OK) PP1V8_UPC_XA_LDOA = 1.8V (OK) PP1V8_UPC_XA_LDOD = 1.8V...

Hello, All coils are good except PP1V2_S3_REG I confirmed a short circuit on PP1V2_S3 I inject 1V and nothing is heating up. I don't want to inject more to avoid further damage. Do you think of a possible RAM problem, if so I start with which one? thank you in advance

Hello, I have this A1708 board which does not go up to 20V The USB-C controller area is clean The u2800 area very damaged, I replaced U2800 and do some retrofitting, now very clean Now I have these abnormal measurements: Q3100 PPDCIN_G3H = 5V (GOOD) UPC_XA_GATE1 = 7.25V (NOT GOOD)...