Hello,
I've stumbled across this thread because I'm trying to repair the same power supply.
in my case i have a blown Q5 mosfet. I also found that R98 and D63 are bad.
I see that D63 have the "A6" marking, googling it i found it correspond to [URL="https://www.mouser.it/datasheet/2/916/BAS316-3081362.pdf"][B]BAS316,115 [/B]diode.[/URL] Could it be?
I've read that i should check or replace the driver IC, do you know where is it in the board or the ic name?
About R98, the original value is 50Ohms, right now I only have 47 or 62 Ohms...
speggio91
Senior Member
Last Activity: 03-17-2024, 09:52 AM
Joined: 04-11-2020
Location: Italy
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Finally I think I've fixed it!
What did I do:
-Retouched with flux and solder all the connectors of J8300
-Replaced U5810
-Replaced U3540 (not really necessary but it didn't have a good look)
-Retouched pins #11 and #12 of U5800 which was previously reflowed but those two pins seemed to not have a proper connection with the board.
What a journey! Thanks you all for the support and I hope this topic will help someone else in a similar situation.
Merry Christmas!Last edited by speggio91; 12-24-2023, 10:17 AM.Leave a comment:
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good board display connector diodes measurements (display attached):
1. 0.0V
2. OL
3. 0.62V
4. 0.62V
5. OL
6. 0.66V
7. 0.66V
8. 0.66V
9. 0.66V
10. 0.66V
11. 0.66V
12. OL
13. 0.0V
14. 0.63V
15. 0.58V
16. 0.58V
17. 0.0V
18. 0.50V
19. 0.50V
20. 0.0V
21. OL
22. OL
23. 0.0V
24. OL
25. OL
26. 0.0V
27. OL
28. OL
29. 0.0V
30. 0.0V
bad board display connector diodes measurements (display attached):
...Leave a comment:
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The LCD show spotlights only with the bad board. With the known good one there's nothing visible.Leave a comment:
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For lcd backlight controller you mean LP8550 (U7701)?
In the schematics I've found only BKL_SDA and BKL_SCL. Did I miss something else?
BKL_SDA = 0.554V (diode mode)
BKL_SCL = 0.553V (diode mode) and 3.3V (voltage to ground)
I've also tried to run the ASD in another good known board and that error still show up.
One thing I noticed on the water damaged board, is that on the half bottom right side of the LCD, there's a spotlight effect, that doesn't happen with the good known working board.Last edited by speggio91; 12-23-2023, 06:34 PM.Leave a comment:
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I've downloaded and ran ASD EFI 3S156 from an USB drive, I did a full test cycle and an error has been found. I've attached a picture about it. No sensor issues was found though.
I might try to remove and replace U5810, as seen in the Rossmann forum topic, even if I'm a bit skeptical that it would make any difference....Leave a comment:
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Thank you for the hints Mon2.
The trackpad i'm using belong to a known good case, I'ìve tested it with another functioning board with no issues on the sensors.
I've took some measurements for all the SMBUS scl and sda lines:
SMBUS_SMC_0_S0_SCL = 2.9V (voltage to ground) and 0.58V (diode mode). With the display connector detached the diode mode value is: 0.77V and the voltage to ground is 3.3V
SMBUS_SMC_0_S0_SDA = 2.9V (voltage to ground) and 0.59V (diode mode). With the display connector detached the diode mode value is: 0.77V and the voltage...Leave a comment:
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I've finally received some LP8550 alongside with some MMBT3904LP-7B DFN-3 (Q5158). After replacing both components the backlight is functioning properly, it only need to have its slope reprogrammed as suggested by piernov.
When the system boots, the fan is still spinning at full speed and the system is a little bit slow. I've downloaded macs fan control, but all the sensor reads good temperatures and the cpu doesn't seem to be thermal throttling.
I've tried to do the PRAM and SMC reset and they both gave no improvements.
If I startup the Macbook in SMC bypass mode, the system...Leave a comment:
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Hello again,
J6100 is completely clean, no water went on it.
In the SPI area there wasn't any water infliltration either. I've checked all the connection between all the resistors and they are all interconnected.
I've replaced U6100, U5620 from a donor board, nothing has changed.
On the bottom side of the board there is nothing that got touched by the liquid, no corrosion was found.
I've first reflowed the SMC, nothing has changed.
I've then desoldered the SMC and I've found that the pad 117 (PP3V42_G3H) is gone. I've scraped underneath...Leave a comment:
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Good news!
I've purchased an early 2015 air in immaculate conditions that had no power issue. I've fixed the board and I swapped it with the one of this topic.
The machine is actually turning on, the screen image and backlight are working and the battery is charging.
The charger led is also working, turned out to be the flat cable 821-1722 that had a pin that desoldered after it got shorted when it got water damaged.
After booting, the OS is kinda slow due the missing transistor Q5158 that I will replace as soon as I will get some more of them.
...Last edited by speggio91; 11-27-2023, 06:24 PM.Leave a comment:
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All the caps above the CPU are measuring good values, no short have been found.
All these SPI lines are connected to the respective resistors.
SPI_ALT_CS0_L
SPI_CLK
SPI_MOSI
SPI__MISO_R
SPI_IO2_R
SPI_IO3_R
All the resistance values are correct, no traces of corrosion or liquid damage has been found on the SPI area or R8020 one.
Measuring the resistance of all the main S4, S3 and S0 power lines didn't show any shorts to ground.
I've tried to replace from a working board U1950 and u7400, nothing has changed, the...Last edited by speggio91; 11-26-2023, 05:50 AM.Leave a comment:
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820-00165 pulsing and stuck at S5
Hello everyone!
I have this board that got slightly water damanged and it is stuck at S5 state. It pulses once every 5 seconds.
When connected the magsafe 2 to the bench psu, the current goes from 0.02A to 0.10A when is pulsing.
When using the genuine magsafe 2 charger, the light turn on and it became green and then amber. The fan is not spinning.
When I tried the SMC bypass mode, the fan spins a quarter every 5 seconds and the pulsing is still present every time the fan spin.
The pulses are present in the CPU Vcore rails on L7320 and L7310....Last edited by speggio91; 11-25-2023, 11:29 AM. -
Re: 820-00165 no greenlight in S0 state
-I've fixed that corroded pad but there's no change to the green light/orange light in the charger behaviour, both are not yet present.
I've measured the battery voltage on the pins 1,2,3 of J6950 and there seems to be some activity there, the starting voltage with no charger connected is 1.5V. After connecting it it raise up to 4.5/5V and it seems to be rising.
-on C7797 I measured 40V when the display connector is connected. That voltage is present even if I'm not in the SMC bypass mode. Does that mean the board is powered...Last edited by speggio91; 11-20-2023, 06:34 PM.Leave a comment:
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Re: 820-00165 no greenlight in S0 state
Reformatt, thanks for spotting that corroded pad, I really didn't see it in the first place.
Later I will try to fix it and see if the battery charging circuit will work again.
Also thanks for the tips about the older macbook market model, I will take a look.
I also seen some aftermarket screen from aliexpress for 50€, that would be my last stand in case I won't find anything cheaper on ebay or similar marketplaces.
Later I'll test the backlight voltage as well.
About the SMC, I was thinking...Leave a comment:
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Re: 820-00165 no greenlight in S0 state
Maybe I haven't explained very well the screen situation but the connector itself is in good conditions. The problem is that the macbook air i've been working on has been damaged by a previous technician that broke the screen assembly trying to pry open the adhesive bezel. The panel and the backlight are broken, I should buy a new screen to test the LCD screen output.
I've cleaned the connector as suggested, I've attached some pictures.
I've also uploaded few pics about the SMC area, there are some burnt component that i'm...Last edited by speggio91; 11-19-2023, 03:47 PM.Leave a comment:
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Re: 820-00165 no greenlight in S0 state
I didn't realize that also the panel itself is broken, I can't tell you what's the screen showing.
When I press the caps lock key, the green led show up.
Could it be an ISL problem? Maybe also the SMC could be..Last edited by speggio91; 11-19-2023, 11:58 AM.Leave a comment:
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820-00165 no greenlight in S0 state
Hello everyone,
I've started to practise more on macbooks air board, I've got a bunch of defective ones, to see if I can gain some more knowledge.
I've been focused on a water damaged board of an 2017 Air.
Someone else already worked on it, the SMC has been reflowed plus some minor reflows around the board.
I've reached a dead end but I improved the state of the board.
Initially it was no power, no green light, no fan spin, stuck at S5 state.
After replacing some components (U7090, Q5500, Q7430, C7432, Q7630, U1950, R6115, R6116,...Last edited by speggio91; 11-19-2023, 10:17 AM. -
Re: 820-00165-A No Power
final update:
the general slow down of the OS got fixed apparently by plugging in the battery. The first tests after reassembling the machine was done without it.
I also did a PRAM reset and it did increase a bit more the loading speed.
Thank you all for the interest and support, you are a guarantee!
Leave a comment:
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Re: 820-00165-A No Power
I have an update:
I'm feeling misarable to say it but the culprit was the J7000 not being connected to the magsafe board
Not having experience on these boards before I didn't think of connecting it, I thought that J9500 flat was enoug haha
Now the macbook is powering on and loading the system. The wifi adapter is also being recognized. Everything seems to work well exept for one thing.
Maybe it's me, but I think now the system is running a bit slower than before, the apps are taking lot of time to...Leave a comment:
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Re: 820-00165-A No Power
Hello Mon, thanks for your message.
D7005 on battery only:
pin 1: 7,6V
pin 2: 51mv
pin 3: 7.4V
D7005 on charger only:
pin 1: 2V
pin 2: 44mv
pin 3: 1.5V
Some observations:
when i measured D7005 with the charger connected, those voltage were decreasing very fast on pin 1 and 2. Even after I unplugged the charger, those voltages were still there and eventually reached 0V after few minutes.
If i connected and disconnected the battery, and taking measurements...Leave a comment:
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