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Thanks 2informaticos. Sorry, i had tested video prior to checking if there was USB activity. I guess its easier to go the other way. Still learning. :) I was also rushed yesterday, so apologies for the typos... PPBUS_G3H is 8.56v. PLT_RESET_L = 3.31v

Hi all. I have a water damaged 820-00165-A that has no display, either on the internal panel, or on an external screen. There is zero change on the screen when power is connected. I cannot see an Apple logo or folder question mark while shining a light from the back. I have tried another...

Hi all. An interesting one. We have an A2338, running Monteray, that has no back light from the moment you turn it on, until you have logged in with your password, when it will turn on, and stay on. i.e. the Apple logo doesn't have a back light at all, or the login screen. We have tried two...

Thanks again 2informaticos. I only have a CH341A programmer, with a standard 8 pin SOIC adapter. To load a good BIOS, do you have to manually solder wires to the board, or is their an adapter I can just plug in? Never programmed a Mac BIOS before. And, given I can get the unit to boot in Target...

SMC_LID 3.40v SMC_LID_LEFT 3.40v SMC_LID_RIGHT 3.40v

Hi again. I rechecked CPU core - goes to 0.69v then stays there. I get USB light flashing on all 4 USBC ports. Yes, Capslock light works correctly. Touchpad does tap correctly when unit is turned on. NO Chime after PRAM reset - no chime, ever. No fans, ever. The macbook appears as a disk...

OK. That makes sense. Thanks again for your help. With the screen disconnected, red lead to ground, all seem to read around 256: Diode mode to ground readings: EDP_INT_AUX_N 254 EDP_INT_AUX_P 257 EDP_INT_ML_N<0> 256 EDP_INT_ML_P<0> 257 EDP_INT_ML_N<1> 255 EDP_INT_ML_P<1> 256 EDP_INT_ML_N<2>...

I had tried disconnecting internal LCD, but still no external on any of the USBC ports. I retested, on all 4 USBC ports, with two different USBC-HDMI adapters that we use regularly on other macbooks.

lol, good diagnosis there 2informaticos in regards to the low battery on my multimeter! OK, after replacing the battery in it, here's the CPU core voltage: When I press the power button, about 3 seconds later, PPVCC_S0_CPU goes from 0.0v up to 1.14v About 3 seconds later, that voltage drops...

Hi all. First, I'm not familiar with working on this model board. No video on internal panel or externally on any USB C port with a USB-HDMI adaptor that I've had working in other Macbooks. No fans, no chime. No signs of any liquid damage on either side of board. Power rails seem good, CPU...

OK. PM_SLP_SUS_L 0.00v. :( Oh well, at least I learnt a bit. :) Thank you nonetheless for all your advice and suggestions 2 informaticos. I appreciate it, once again.

PM_DSW_PWRGD 3.34v PCH_DSWVRMEN 3.22v PM_BATLOW_L 3.34v SMC_ADAPTER_EN 3.4v RTC_RESET_L 3.31v PCH_SRTCRST_L 3.30v PCH_INTRUDER_L 3.03v PCH_INTVRMEN 3.23v

OK I replaced R7561, and the PP3V3_S5 rail now reads 3.34v Still only green then amber Magsafe light, and no fan spin though... PPBUS_G3H 8.57v PPDCIN_G3H 16.95v PP3V42_G3H 3.41v PPVRTC_G3H 3.33v PP3V3_S5 3.33v Which all look good, but: PP3V3_SUS 0.0v ? I'll have to look and see what...

oh, sorry 2informaticos. Gee. they are tiny! OK, Ohm values when removed: R7560 23.2K R7561 4.6K (less than 1/2 what it should be?) R7563 10.5 Replace R7561?

Hi 2infomaticos. Thanks for you input and advice, once again. R7560 4.2K Ohms (should be 23.2K Ohms) Pin 1 5.96v Pin 2 1.08v R7561 3.9K Ohms (should be 10K Ohms) Pin 1 1.08v Pin 2 0v R7563 10.2 Ohms (correct) Pin 1 5.97v Pin 2 5.97v R/C network at pin 15 of U7501 shows 846 Ohms to ground...

Hi all. I have a dead 820-00165-A logic board, only an green then orange light, with everything including the battery disconnected. When it arrived, with those symptoms, I found U1900 was getting to hot to touch. Checking power to U1900, PP3V42_G3H was correct at 3.40 volts However, PP3V3_S5...

OK, fixed. Thanks again 2informaticos. You were right, once again - it was the USB ports themselves that were shorted. I managed to desolder one from the ONLY matching board I had. It was relatively straight forward, until I accidentally desoldered two tiny diodes right near by, while cleaning...

Correction.... I found a dead board that matches.... :)

Hmm, I don't think I have a board amongst my dead parts.... damn. Had a look at that online auction site - one seller is selling them "refurbished" for $90 USD plus $30 international shipping, lol. I think I'll pass at that price.

Thanks 2informaticos. OK.... I'll give it a shot. I've never really used solder paste to desolder anything.... I've already removed the heat shield from the bottom side of the board. Should I be covering the 50+ pins under the heat shield on the bottom side of the board with 138 degrees...