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Found that pin 1 (USB_EXTB) on R1581 wasn't actually making contact, so removed that, cleaned the pads and replaced it. The right USB seems to be working now. Those 0201 resistors aren't great to solder!

I took off R1583 with the intention of replacing it, but when its off the board, it has 99.8k resistance which it perfect really.

To give the board an even heat. Without preheating the board, a lot of the heat applied with the rework gun will be lost into the ground planes of the board resulting in "popcorning" the chips.

Thank you Duke, R1580 is 3.28v on USB_EXTA, 3.33v on PP3v3 - 98.3kohm R1583 is 3.21v on USB_EXTD, 3.33v on PP3v3, - 78.6kohm Apart from the 78.6kohm on R1583, they look pretty okay, maybe 3.21v on R1583 is a bit low also. What do you think? Thanks again for helping, I hope I gave enough...

3 beeps may be a RAM issue. Take a look at this post: https://www.rossmanngroup.com/boards/forum/board-repair-troubleshooting/95-820-3023-2011-macbook-air-ram-issue-3-beeps

Hi, I have a A1502 with 3476 (8GB) board that has has had liquid damage. Its been cleaned and now works apart from the right USB (I/O board) is being disabled due to too much draw. The left usb works fine, even when the right it disabled. Keyboard and trackpad work fine. Trackpad had some...

Thank you Duke, a gentle flux and heat of LP8550 (U7701) did the trick :)

I'm trying to find out if there is a problem with the actual backlight or the circuit. I'm getting around 24v on PPHV_S0SW_LCDBKLT until the brightness is turned up, then it jumps all over. I don't have another assembly for this model in stock to simply try another. What do you recon the odds...

Replaced the SMC chip and its all good now.

Finally received the new IO board connector.. made no difference. Connector seems fine, I'll take another look around the SMC.

I have a brand new IO board that I have tested with but I've got the ribbon connector on order. Don't suppose the 13" air version ribbon could be used to test with could it? I know it isn't the same shape but I have one to hand is all. I have found that if I plug the charger into another mac...

Still no signs of life or lights on the charger though

Okay, a light reflow of the SMC and I seem to have 3.3v on the middle pin of the charger, 8.6v on PPBUS_G3H and 3.3v on SMC_BC_ACOK

I'm now getting 0.71v on PP3V42_G3H 0.65v for SMC_BC_ACOK

I think the charger went crazy when I moved the board. I'm getting around 0.4v on the middle pin. On D7005 pin 1 PPBUS_G3H i get .04v Sorry for the fuck up before

I get 0.1v on PPBUS_G3H

I lied, I get 0.483v

Nothing on the middle pin

Got no PP5V_S5 though :(

Hi, I have a A1465 820-3435-B board with no charger lights and no signs of life. I have PP3V42_G3H present. No water damage but has had a replacement SSD. DCIN is 15.15v on a 45w charger & 16.61 with an 85w charger R7120 is measuring 14.61v on all 4 pins I'm stuck.