Hi, i have a Apple MacBook with bit liquid damage, the Mac is running, but Webcam is not found in the system and not running. where is the IC vor the cam?
ore the areal?
thx
ore the areal?
thx
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Re: MacBook A1989 820-00850 no WebCam
I found 3 parts defective, or rather 1 defective and 2 missing! The L8504 has burned out. And the two DB529 and DB504 are missing.
I get L8504 from a dispenser board and the other 2. Can someone tell me what the DB504 and DB529 are for? -
Re: MacBook A1989 820-00850 no WebCam
Hi.
1) you are working very late
Be sure you are well rested for these micro surgeries of the logic board. Even with my rested eyes, these parts are very small.
2) L8504 is an inductor and intended to filter noise on the voltage rail. In a pinch, not required for operation. You can simply bridge pin # 1 and # 2 of the L8504 pads to complete the flow of the voltage from one side to the other to power your webcam logic board inside the display panel.
3) DB504 and DB529 are TVS diodes and they are quite small. They are intended to suppress any sudden voltage spike so that the controller IC that is interfaced to the USB connector does not get zapped. ESD diodes is the name for these parts and should you touch the connector with your fingers after walking across the carpet - that will make you look like Electroman and this zap is dangerous to low voltage logic onboard the macbook.
Again, in a pinch and if you are well grounded, these parts are not required for operation. However, I would suggest you source a bunch of them to replace the missing parts. They are too easy to lose during the operation so order some spares.
If you need to, send me a PM and we can look into drop shipping them to you from Arrow.com - we are supposed to have free international shipping with Fedex freight with Arrow. Otherwise, you can source from Aliexpress, etc.Attached FilesComment
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Re: MacBook A1989 820-00850 no WebCam
Hello, yes it is the weekend. So have a drink or work on the Mac ;-). I have a couple of dispenser logic boards - that's where I found the parts. I'll solder them in later. Then the cam will definitely work again. And for the eyes I have an AmScope ;-) brComment
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Re: MacBook A1989 820-00850 no WebCam
I will take the L4004 from the A1706 820-00239 I think its the sameComment
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Re: MacBook A1989 820-00850 no WebCam
It will work fine. Very common part and not critical to the operation.Comment
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Re: MacBook A1989 820-00850 no WebCam
the camera is running again! But do the pins for DB504 and DB529 have to be bridged if I don't solder them in or not? ThxComment
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Re: MacBook A1989 820-00850 no WebCam
Good job!
On the TVS ESD diodes - NO!
If the parts are not there, you must leave the pin pads open (floating). Without these parts, you do not have ESD (static discharge) protection for these lines. It is not a major issue since the USB signals are inside and on the logic board.
If you indeed source the replacement parts, solder them back in like normal.
If you were to short them, then the USB signals will be shorted and the camera will no longer function and may lead to other damage
The TVS ESD diodes are very common to source from Arrow.com or offshore (Aliexpress). If you are interested in the part # - post back and will locate some links for you.Comment
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Re: MacBook A1989 820-00850 no WebCam
ok thx
4 parts were still defective.
the 2 USB-C on the side where DB529 and DB504 are missing, RB631, RB641, RB651 and RB661 were all burnt on pin 2. I swapped all 4. I took the parts from the 820-00239. Now the 2 USB-C ports work again. It's closing time now.Comment
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Hey everyone!
I have a MacBook Pro A1989 with a 820-00850-A board that recently stopped working. I used it overnight to charge my phone, in the morning it didn't turn on, I assumed flat battery but now won't charge and doesn't start at all.
I have fully dissassembled it, when disconnected the battery reads at 0.012V. Even with the battery disconnected the laptop doesn't boot.
The diode voltages around all 4 CD3215's seem fine.
For all CD3215 (UB300, UB400, U3100 and U3200) I read just above 5V on PP20V_USBC_TA_VBUS, 3.3V on PP3V3UPC_TA_LDO, 1.8V... -
Hi everyone,
I have a MacBook Pro A1989 that was likely exposed to liquid. It doesn't display an image on the built-in screen, but the screen is backlit (you can't see the Apple logo or any other elements when held up to light). The laptop provides 20V and 1.5-2A, and it works fine when I use it with an external monitor. Currently, the connector for the display (J8500) is disconnected. I'm writing to ask for help in diagnosing the issue. I've heard that when the J8500 is exposed to liquid, the processor pin responsible for the display might short-circuit, and I'd like to know... -
Hello everyone.
I have recently obtained a MacBook Pro A1989 model with a touch bar and Apple ID. Unfortunately, it does not want to start up.
No CPU Voltage.
U7800 Does produce voltages.
T2 Chip warming up very very little.
I do have voltages like 1.8, 0.9, 3.3, 2.5 volts, etc., present. I did not find any short circuits. Unfortunately, the device has no touch ID/start button. So, I have used the debug jumper to put the device into DFU mode. - It is getting recognized as a Macintosh while not in DFU mode and as Apple (DFU) while in DFU mode....11-24-2023, 11:55 PM -
Hi guys.
I Just replaced battery on my MacBook Pro A1989. Unfortunately doing that, I’ve broken the trackpad flex cable (821-01701-a), and I’ve already ordered a spare one. At the same moment I’ve noticed that also the keyboard it’s not working anymore and I’ve found an SMD chip unsoldered and moving freely inside the backplate. I can read L20L on the chip. Is something could explain the keyboard not working or the keyboard doesn’t work due the unconnected trackpad?
thanks...04-17-2025, 09:42 AM -
Hi all, I picked up a MacBook pro 13" with a A1989 mainboard, it suffered a little liquid damage around the CPU power section,
USB C switches to 20V 0.17 amps, this rises to .6 amps, stays that way for 30 seconds or more, then drops to 0 amps, 20V is maintained, fans spin at full speed for 1 second then the cycle starts over, CPU warms up slightly, mosfets U7210 heats to 38C and U7220 briefly heats and then goes cold at the start of the cycle,
Could anyone point me to some posts on what voltages to check and where / how to check for shorts and the places to often check?...
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