Search results

Hi all. Liquid damaged 820-00165-A Minor corrosion on top side of board around U6100 - U1900 & U7701. On the bottom, only a tiny bit near Q7155 Cleaned affected areas. Get green then amber LED on magsafe2 adapter. Tested with spare known good adapter No fan spin. I've tried to manually start...

Hi 2informaticos. Long time no speak. :) Thanks for your suggestions. SYS_DETECT 3.29v SYS_DETECT_L 0v R6956 is 10K ohm. 3.29v on both pins. Q6955 0v on pin3 (SYS_DETECT_L) Q6950: Pin1 1.8v Pin2 1.8v Pin3 3.3v Pin4 1.8v Pin5 1.8v Pin6 Fluctuates slightly between 3.24v and 3.29v Diode mode...

Hi all. I'm working on a 820-01598 that had water damage. It originally came in not turning on. The only signs of corrosion was on the bottom side of the board. There was a small amount of corrosion on the battery PCB, On the logic board, there was a small amount of corrosion near F7000. I'll...

Thanks again for your help 2informaticos. The board did not have R5226 or SW5200. Both were not populated. We found C3100 was shorted. Removed and now get 20v and the board is working correctly. Boots into OSX OK. Thanks, once again for your help, I really appreciate it.

Thanks 2infomaticos. PPBUS_G3H = 11.04v with battery attached, with the data line connected as well. SMC_USBC_INT_L = 0.24 with battery SMC_USBC_INT_L = 0.04 without battery No history available, other than the last time the customer used it, it worked.

Hi all. I have an A1707 2016 macbook that is not turning on, either via battery or via genuine known good AC adapter. No signs of liquid damage. Missing PPBUS_G3H. Suspecting U7000, but thought I'd get advice first. Here's a list of what we've checked. PPDCIN_G3H = 5.27v PPBUS_G3H = 0.23v...

Hi all. I'm trying to recover some photos from a customer's iPod touch 4. When it was bought in, it was in a Apple logo - white screen - reboot loop. I can get it into recovery mode, and I have tried to flash it from there using 3uTools, however the flash fails with "Error: Unable to restore...

Ah, OK. I had assumed that the trackpad click was a sign of life on all of them. Plus the fact the power button would seem to turn the trackpad on and off. However, no signs of life from any USBC port with a USB with a LED on it. PPVCC_S0_CPU = 0v PPBUS_HS_CPU = 12.56v PPVPCORE_S5 = 0v...

Hi again. I get 20 volts to F3001 when connected to the outer USBC port on J3300. The trackpad clicks, so the unit is turning on, but there is no display. The power button will turn the unit on and off - i.e. the clicking will stop, or start, again. There is no signs of any liquid ingress to...

Fair enough. Yep, dead. Thanks once again for your help and advice.

I'm still learning! I removed F8400 to see which side had a short. I only injected 1v, which I thought would be safe. :( The max amps it drew was 2.5A. So do you recommend replacing U7960 and hoping?

Hi all. I have a dead 820-00269 from an A1706. Missing PPBUS_G3H. I get 20v on F3001, however no voltage on F8400. I removed F8400, and injected 1 volts into pin 1 and found U7960 getting very hot. I removed that and there still appears to a direct short (zero ohms) to ground on the pads of...

Thanks again for your advice 2informaticos. Unfortunately, that job went pear shaped. :( What temperature do you need to remove UB400? I ended up overheating the board, to the point that other components started floating....its game over unfortunately for this board. I read that all 4 CD3215...

Hi again 2informaticos. Thanks for your advice once again, and sorry for the delay. OK, I measured all 4 LDO rails on all four CD3215 chips. In diode mode with red to ground, most rails measure between 524 & 570. However, 2 rails do not, and appear as short circuit. These are: UB400...

Hello again. I have a 820-00239 that appears dead - no life, no fans. No USB activity at all. No signs of any liquid anywhere on either size of the board. Tried with known good AC adaptor with just the bare board. I don't seem to get 20v anywhere - the most I get is 5.7 volts. I'm also...

Ah, OK. Thanks, once again, 2informaticos. :)

Hi again all. Short circuit to ground on PPVRTC_G3H. I suspect the CPU is dead, but thought I'd check before writing it off. 820-3437 Magsafe light OK, no fan, no chime or anything else. No signs of liquid ingress or other damage. I've removed all caps on PPVRTC_G3H, short to ground (0.08Ω)...

Thanks again 2informaticos. Sorry for the delay. I had covid and was away from work.

Hi again. I have an 820-00928-A that does not detect the internal SSD. This unit was apparently water damaged. Another technician cleaned the board, unfortunately, so I cannot see where the liquid got onto the board. There are no signs of corrosion anywhere. Booting from a Monterey boot disk...

OK. Cleaned J6100 - was a tiny residue of crap still there surprisingly, but no change. Cleaned both U6100 and U6101 - no change. Checked voltages on SPI Bus Series Termination resistors. SPI_SMC_MISO 3.31v (measured at pin 2 of R6114) SPI_SMC_MOSI 0v (measured at pin 2 of R6115) SPI_SMC_CLK...