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Seems no liquid damage. But USB-C to magsafe converter were used before it is dead. where to start?

ALL_SYS_PWRGD = 3.23v CPU_PWRGD = 1.04v FSB_CPURST_L = 1.04v

This wont turn on, without ram it wont beep (good known one will beep without ram). where to start?

let me try to pull the video cable and re-test it. some kind of "upgrade" yes, at least I saw the hdd was replaced. But also the serial number is gone (not visible in MacOS) so I have programmed a known good bios to it to get the serial number back. I guess the rom must have been corrupted...

Only those sensor with check marks passed the test, the others (IDSR, PDSR, Tp1P, Tp2H, Tp3H, VDPr, VDSR) reported either sensor value problem or SMC error.

checked R6331. R1310, R1311, R1312, R1313 they are all good. Is there any other that I missed that I should check before changing U6201?

Other than sound. Everything else seems to be ok so far. C6411 got knocked off and U6410 seems to have a little chip around the corner (at pin1) U6200: pin 1 (PP4V5_AUDIO_ANALOG) = 4.5v pin 3 (4V5_NR) = 1.2v pin 4 (4V5_REG_EN) = 3.3v pin 6 (4V5_REG_IN) = 5.1v PP3V3_S0_AUDIO_ANALOG - 3.3v...

No chime. MacOS will not detect any audio devices (settings no mic/in/out). Where do start?

sorry, turns out this has more problem. keyboard not working (power on button seems to work) but other key has no response after boot up. Trackpad also not working and the known good IO board also not working. something more serious upstream?

how do I check those pin without causing a short into the metal shield?

Yes, I do have 5V for a few seconds at pins 28-30 of J8300 after resoldering all pins of U3210. Actually my LCD arrived and I have hooked it up and saw the flashing folder so it actually displayed via LCD now. However, BOTH thunderbolt port are still not working, TBT_A_HV_EN is 0v.

I do, just that I dont have a A1502 LCD handy right now and need to get one.. I will have the A1502 LCD in a few days.. but I was trying to see if I can do some troubleshooting before that arrive. e.g. getting it to display via thunderbolt or something like that..

sorry do i need to have LCD plugged in to test the 5V at pin 28-30 of J8300?

Minor corrosion around U8300 and U3210 and cleaned by some flux and hot air. The board will chime but no display whatsoever via LCD nor thunderbolt port. where to look?

i got it to start by putting it back onto the case just to make sure i didnt accidentally fry it or something.. it starts.. Now when I measure voltage on the RIO: AP_CLKREQ_L is 0v PM_WLAN_EN is 3.3v WIFI_EVENT_L on the RIO board and it is giving 3.1v.. is this abnormal?

All iCore Macbook boards start automatically when charger is plugged in; if no battery connected. ^^ I dont have battery plugged in, but how come the usb mouse has no led if it automatically start?

sorry for a stupid question.. i have the board out of the case(but with RIO board connected), how do I start the board? (magsafe is orange and mouse no led)

pin 22 & 24 of J9510 diode mode to ground reading is 427 After connected airport card, PCIE_AP_R2D_N & P both have values.

Continuity from C9532/33 and L9501 to J9510 are OK. Diode mode reading of: PCIE_AP_D2R_N = 330 PCIE_AP_D2R_P = 330 PCIE_CLK100M_AP_CONN_P = 240 PCIE_CLK100M_AP_CONN_N = 240 PCIE_AP_R2D_N = open (diode mode reading kept at 1) PCIE_AP_R2D_P = open (diode mode reading kept at 1) is this normal? I...

did i check this right?