Not yet, will do it and report back. Thanks
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C9560 failure is a problem on 820-2850 not 820-2915.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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be very carefull that the psu is in perfect working condition as some charger give green light but fail to power on the board. also bad battery can lead to this problem too.
try smc bypass if it start:
short the 2 pins on board, then connect psu while keeping the two pads shorted, then release the pin and short them again. check if pc start with full fan spin and give post and screen.Comment
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Any other idea?Comment
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read voltage on C7205 pin N° 1
check voltage of r7940 both side,
post u7201 voltage.Last edited by dellxps15; 10-18-2024, 02:07 AM.Comment
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Sorry for the delay ... long working hours ...
So, ping 1 on C7205 - oscillating
Same for both sides of R7940.
Regarding U7201, do you mean the voltage on all pins?Comment
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voltage on c7200,
resistance on c7205 ?Comment
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Very confusing ... the board was sitting on my desk since my last reply, so about 3 weeks away. At first the voltmeter showed 3.7-5V, then up to 12.4, then down again, then 12,4 for minutes until I got bored waiting for a change. Powered off, tried again - 12.4V. I put the MB away and check it the next day - 12.4V. At some point I just left the MB powered on, decided to get back to it in about half hour. After a few minutes the green light from the magsafe went off. I reconnected it - green light and 12.4V, and the magsafe did not go off. Not sure if that tells anything...
The resistance on C7205 starts at around 20 Mohms going down to 4 MOhms.
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your macbook has some problem with ppbus and smd. 12,4 volt going down could be bad 10omh resistor r7021, r7022. check if they are 10omh.Comment
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R7021 and R7022 are both intact and have 10 Ohms.Comment
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board should not power on on 12,4 volt unless u do smcbypass. ppbus must be 12,57 volt (12,6) not 12,4 as smc is not boosting. if u connect fan, and connect psu, fan start spinning or they dont ?Comment
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No fans spinning...Comment
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Any other idea?Comment
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Measure the voltage to ground of:
SMBUS_SMC_BSA_SCL
SMBUS_SMC_BSA_SDA
on J6950 (battery connector). Post the voltage measurements.Comment
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Hi
Im hoping someone might be able to give me some idea of what may be wrong with my Monitor Audio RSW12 Sub.
Ive owned it since new in around 2002, so would really like to keep it running if I can, it was the first ‘decent' bit of audio equipment I ever purchased and is a little sentimental.
The issue I had was that it would power up with the red light, but sometimes the green light would not come on and I would get no bass from it. If the green light did come on though, I would get sound out of it.
I have already tried replacing all of the... -
Hi
Im hoping someone might be able to give me some idea of what may be wrong with my Monitor Audio RSW12 Sub.
Ive owned it since new in around 2002, so would really like to keep it running if I can, it was the first ‘decent' bit of audio equipment I ever purchased and is a little sentimental.
The issue I had was that it would power up with the red light, but sometimes the green light would not come on and I would get no bass from it. If the green light did come on though, I would get sound out of it.
I have already tried replacing all of the... -
Hi
I have an 820-2610-A motherboard that has no green light.
I have noticed is when I do a SMC reset the light on the Magsafe blinks.
From My understanding, the sys onewire circuit is responsible for the green light on the magsafe
The sys onewire circuit on this model and others is more involved
I was hoping if anyone knows about this and how it works, can reply and let me know
I know this is an old model but I am sure there are people who still works on these or knows about them
I get 1.1v on the C7771 capacitor and will replace... -
i have macbook a1466 board id 820-00165 with power fan spin green to orange light not booting no image or light i tried to fix its leak chip number U1930 but sad it has been damage due of corrosion here i attach the image of board. possible there is a jumper ways for it can't find parts for it to buy.
in first image there is 0v out for lcd
https://ibb.co/5XppmpkH
in 2nd image U1930 chip is damage is there any jumper solution or parts can be compatible for it
https://ibb.co/fdJkbJs8 -
Hello, greetings everyone. I NEED YOUR HELP
I got this macbook that doesn't turn on, I don´t have a green light, but it's got a fan spin for a few minutes and after it's off.
This macbook comes in without damage from liquid spill.
The story of the Mac is that the screen closes and left without use for two days. Then they try to turn on and it won't turn on. Then they connect the charger and it doesn't give light.
It´s a Macbook Air 2017
Please help me understand how this works... Correct me if I'm wrong in my way of...
Comment