Re: 2011 macbook air 3 beeps
so any macbook from 2011 stay away from? I know about the GPU issues.
TimT
Badcaps Veteran
Last Activity: 12-08-2019, 03:21 PM
Joined: 11-17-2012
Location: savannah ga
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2011 macbook air 3 beeps
I everyone I have a 2011 macbook air 820-3023 it was giving giving 3 beeps and wont boot. I reset SMC and PRAM. nothing was working so I reflowed the ram chips. after reinstalling the board it powered up, screen came on and I got a chime then it powered off.
now it wont power on and I am getting a dim green light on charger. after cheacking the board Q5310 was getting hot. I replaced that but it still gets hot.
with Q5310 pulled pin's 4,5,6 are getting 16.6v pin 2 seems to be getting 0.6v
Resistors R5311, R5312 test good. C6905 also test's good. no short to ground... -
Re: 820-2850A wont turn on
Thank you Mcplslg123! found them all at Digikey except the Isl6259-EbayLast edited by TimT; 07-25-2019, 07:40 PM.Leave a comment:
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Re: 820-2850A wont turn on
RJK0332DPB is proving hard to find. anyone know of a alternative?Leave a comment:
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Re: 820-2850A wont turn on
The Fuse is good but Q7035 keeps shorting. when i remove Q7035 no short to ground at F7040. I am going to order the 2 mosfet's and u7000 to be on the safe side. I will let you know the outcome. and thanks for the help!Leave a comment:
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Re: 820-2850A wont turn on
possible second short. meter sometime is at 0ohms then not.. used my bench power supply but now wont take any power at F7040. installed a battery and PPbus_G3H is 11.25v No lights/fanspinLeave a comment:
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Re: 820-2850A wont turn on
Q7035 was shorting, after replacing that PPB_G3H came up but only to 1.7v and I noticed a slow drain in voltage in about 20 seconds or so it's 0.9v. re-plug the charger back in 1.7 then drains. I think may have only 0.4v at R7010 I did some testing with the multimeter the results are in the images....Leave a comment:
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Re: 820-2850A wont turn on
The 03.98v was for the CHGR_ACIN 3.412V is for sys_onewire. right now I have 0v on ppbus_g3h.
F7040 has 0v. and both sides continuity to ground with 000.4ohms
Checking pin 23 of U7000 by using the cap C7025 0v there are a few more items I can check on this circuit tomorrow. I will check the multimeter with my Bench power supply and see how it displays various voltages. But sub 1v may display the first digit as 0
Thanks!Last edited by TimT; 07-21-2019, 07:30 PM.Leave a comment:
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Re: 820-2850A wont turn on
I am getting 12.88 at R7010 and started thinking 16v-12.8=3.2v was I reading the multimeter wrong. Here is 2 images, one is the 3.4v on U9000 sys_onewire.
the other is R7010 (2) 0.4v Have I been reading this wrong? if so I do apologize for wasting your time!
Edit: I don't know why the 18v magsafe is only getting 2.8V to SYS_ONEWIRE but the 16v charger is. should the 18v magsafe be considered bad?...Last edited by TimT; 07-21-2019, 08:32 AM.Leave a comment:
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Re: 820-2850A wont turn on
pulled U7000 still getting 0.4v at R7010. checked for continuity between pin 3 of U7000 R7010, R7011 and it's ok. confusing...Leave a comment:
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Re: 820-2850A wont turn on
tried another magsafe 16v only other one I Have. sys_onewire is now 3.4 with u6900 installed! but R7010 1 is 16.5v 2 is still 0.4v my multimeter is auto ranging but never had issues with it. should I pull U7000 and see if R7010 comes up?
ThanksLeave a comment:
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Re: 820-2850A wont turn on
I have pulled U6900 and and the voltage does indeed go up 3.4v. I still need to check R5075.Leave a comment:
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Re: 820-2850A wont turn on
Piernov I do appreciate the help! This is a learning process for me I have watched some of Louis Rossman's videos. That's what got me started in this hobby.
I measured both sides of R7010 1 is 18.8v 2 is 0.44v and 29.65Kohms.
R7010 is 09.29Kohms and 09.30 to ground. I will check the rest tomorrow.
ThanksLeave a comment:
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Re: 820-2850A wont turn on
I replaced R7010, C7011, U7000, R6929, and U6900 from a Donor board. no changes in voltages. I am hoping it's not the SMC as I don't have one and don't know were to find one.Leave a comment:
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820-2850A wont turn on
I have a 2010 macbook pro 820-2850A that won't turn on. no light on charger.
PPBUS_G3H is 0.4v
pp3v42_g3h is 3.4v
U6900:
SYS_ONEWIRE 2.8V
ADAPTER_ONEWIRE 2.8
ADAPTER_SENSE 2.8
SMC_BC_ACOK_VCC 3.4V
U7000:
CHGR_DCIN is 18.4v
CHGR_ACIN is 0.4v <-----
SO CHGR_ACIN And PPBUS_G3H is not correct.
not sure were to go from here.... -
Re: Dell 2320 AIO IPPSB-SFA missing rails
I ordered a new tps51125 and problem solved! Thanks everyone!!Leave a comment:
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Re: Dell 2320 AIO IPPSB-SFA missing rails
The info I posted for pin 16 was incorrect. pin 16 is shorted to the SIO? a few caps along the way? pin 16 has no trace. So I cannot see were it connects to anything unless it connects to the pad under the ic. pin 13 runs strait to a via and connects to a mosfet. pin 16 has continuity to any ground I touch...Last edited by TimT; 07-08-2019, 01:11 PM.Leave a comment:
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Re: Dell 2320 AIO IPPSB-SFA missing rails
Sorry I was checking wrong pin before. Pin 13 and 16 are not shorted. I traced both pin's to the opposite side of the board. the both end up at mosfets. one has no power at all. the other is getting 19.5 in but nothing out. in the attached image the mosfet on the left is a 6416 the other is a 6418...Last edited by TimT; 07-07-2019, 09:55 PM.Leave a comment:
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Re: Dell 2320 AIO IPPSB-SFA missing rails
According to the schematic pin 13 of TPS51125 " pu641 " runs to pr400 and pr394 but on my board pin 13 run to a Via unless I am look at wrong chip. I traced pin 13 to the opposite side of the board. seems to be some cap's and resistors in that area. a few of these has continuity " photo ". pin 16 " vin " of pu641 seems to be shorted to ground. I did not have much time to look at this yesterday, I should have more free time today....Leave a comment:
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Re: Dell 2320 AIO IPPSB-SFA missing rails
Pin 85 and 11 " VCC " @SIO is 0v. the 2.2k Resester is 2.195 I checked pu641 pin 16 "vin" has 1.3v pin 13 "EN0" has 0v. Thanks for your Help! is pu641 the driver for the SIO?Leave a comment:
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