Recent content by gevans91

Hiya, hopefully this is the right section. I am just wondering what peoples experiences with the A1466 trackpad are? Is there a known failure rate with them? Got a customer who brought one in, works fine on the login screen, as soon as you login and reach the desktop the trackpad becomes erratic...

Probably gonna sound like a stupid question but should there be anything on the usb or does it not make a difference? It lights up for a brief second when I power on and then goes off. Tried pram reset and no difference Also not sure if it makes a difference but the original bios chip was a...

Turns out there is usb activity. Tried 2 different mouse's on it and they both light up Still a chance the cpu is dead or is that a good sign there's still life?

Looks like your right, done some more testing tonight, tested all the inputs to the CPU, all measuring fine but still no post Weird thing is I get usb activity, should you still get usb power if CPU is dead?

replaced the bios chip, still no sign of booting, I still get fan spin but it no longer ramps up to 100% like it was doing before, voltages are all still the same as before

Tested all the termination resistors and the traces, all appear to be good Where would be best to source a new bios? I don't have a donor board to get one off, am I better buying a pre-programmed one or are programmers worth investing in?

Sorry should have listed all the voltages at the start Yeah i've got 3.418v on pin 3 U1950 and 3.327v on PLT_RESET_L

The rails all seem to be the same without it attached to board PPBUS_G3H - 8.59v PP3V42_G3H - 3.417v PM_SLP_S4_L - 3.325v ALL_SYS_PWRGD - 3.323v PP3V3_SUS - 3.327v PP5V_S0 - 5.10v

So remove Q3080 and test the rails again?

Yeah sorry meant Q3080

Got a 820-00165 has green light, fan spins for 10 seconds, goes off, comes back on and ramps up to full speed. No chime present All rails seem to be present, no water damage to board and no corrosion as far as I can see. Only odd thing I can see is Q3080* looks burned? PPBUS_G3H is sitting at...

Was thinking of fixing them more for the practice on some older hardware before attempting more expensive stuff, I can pick up the complete machines for $20 each since he was going to be trashing them anyway. Could probably re-sell them for a bit more than that if I get them working Not a lot...

Im new to all this board/component level repair, been watching a lot of Louis' videos on youtube and feel confident enough to start trying it for myself, struggling to find old donor machines to work on though! I have managed to get my hands on 2 Macbook Pro's 1x A1226 and 1x A1260, I have not...