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Put old u6900 back on

Also make sure the old trace is not shorted to ground. This is unlikely but had it happen to me. The smc should be sending signal for green light. I would replace smc next.

If SLC_bcacok and 3.42 is present then you have an smc issue

that should rule out bad smc. some how u have a problem between u6900 and u6901. i would test resistance on r6929, and then check rresistance to ground from pad 1 on u6900 to pin 4 of u6901. kinda sounds like the trace is bad or R6929 is screwed and bringing down the voltage from u6901. report...

didnt want u too reball the smc. what was the voltage on pin 1 of u6900 after you removed u6900? this would have told you if u have an issue on the sys_onewire bi-directional line. this still doesnt eliminate a bad smc. Lets hope u didnt reball a bad smc. Remove u6900, plug in and see what the...

looks more like something is bringing SMC_BC_ACOK_VCC down. i would remove u6900 and test for voltage at pin 1, if voltage is back to 3.4v (assuming you've already replaced the magsafe jack) then i would say smc issue try reflow if same issue replace smc.

ALL_SYS_PWRGD doesn't go above 0v, i tried powering on with everything detached, battery power using power on pads, PPVRTC_G3H IS 3.42v, resistance to ground on pp3v42_g3h is at 0.306 diode mode(i do get a light on the charger). i did just notice that PPVCC_S0_CPU is 0.015 on diode mode. not...

i received this machine today for a screen replacement now it won't power on. this was a normal complete top lid replacement that had no complications everything went smooth(and yes the batter got unplugged before service), but when i went to power it on to test the screen i got no power. at...

ok, back to this one for me. i did get a known good tested screen for it and still same issue. it does have a short burst of 2.9v on l8300 then goes back down to 0.0v. not sure what this means. maybe a bad cap in the line?

check voltage on pin 2,4, and 6 of u8000? Do you have pm_slp_s5_L?

okay not really sure what has happened here. i posted above took the board to my other desk and had a thought to plug in a 60w adapter. what do you know it fired right up. now it even fires with an 85w. not really sure how this could happen maybe the forum scared it into working again. problem...

i measured 47kohm on that. i have a couple of these machines waiting for drives if u need me to verify anything else.

working on this 820-2978 that had liquid damage all around the u2594 area had to replace U2594,u6901,c2599,r2590,c5025,and c4906. a couple had blown off the legs on pp3v42 side or were super corroded but the machine still ran. so i replaced those and put in uc and now it doesnt power up. poked...

yes all caps are present c8320,c8321,c8322,c8323,c8324,c8325,c8326,c8327. all of the coils, fl8300,fl8301,fl8302, fl8303 are present and have continuity. i beginning to wonder if my test screen shit the bed. i tested all pins for short to ground with screen plugged in and only had ground on the...

yes it has external video. the screen I'm using is from a working machine. i did test continuity on the connector threw a good cable also, so don't think its a connector issue.

I've got this 820-3662 that shows no video on the internal display. i get 0v on L8300 so i checked back at u8300 and have 0v on pin 1 which is the power on pin for u8300. i get 0v on PPVOUT_S0_LCD/BKL/T. I don't think this machine is seeing the lcd but not getting voltage on u8300 is making me...

i check and did not have continuity between pin 1-2 of L4600. replaced L4600 and all is working as it should. Thanks. Maybe next time ill turn my brain on before working on boards. :) mark as solved

I've got this 820-3330 board and only one of the usb ports work properly. USB A is not working, it does power on the light on my external drive but that is about it. i guess this port is also a SMC DEBUG port. i get 3.3v on pin 2 of L4600 which makes me think it might be in DEBUG mode, but not...

looks like the ultrasonic cleaner did its job no more high fan spin. problem solved

track pad area looks good. i changed the lcd connector just to be sure. and i got video now. is there away to tell the difference in the screens by just looking at the cables? not sure just yet on the high fan issue yet. i put it in uc found a 128gb drive gonna get an install and see what...