Just received a 820-00165-A logic board, liquid spill on it. I cleaned very well (ultra sonic cleaning). Turned the logic board on & at once the display fuse F7700 blew (BURNT). I saw green stuff on the LCD connector J8300 (pin 3 & 4). As it was corroded & backlight related., On the safe side I replaced U7701, the fuse & the connector. Again turned on the fuse did not blow, the logic board turned on & I get all the voltages, but as soon as I see the backlight on the LCD screen the logic board turns off by itself. I Checked the vollatge 3.3V & 8.52V on F7140 is present but the 5V rail on L7520 is not present at all. Then again I put the Magsafe jack, turns on fine, fan spin well but after few minutes it just shuts down. VIN is present on chip U7501 8.5v on pin 23. Any tips will be greatly appreciated. Thanks in advance.
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Re: 820-00165-A logic board MacBook Air
Shutting down with LCD disconnected too? Tried known good Magsafe, DC-in board, DC-in board FFC?
Always take note of the affected area before cleaning.OpenBoardView — https://github.com/OpenBoardView/OpenBoardView -
Re: 820-00165-A logic board MacBook Air
Yes, the logic board shuts down even if the LCD harness cable is not connected. I am trying with know good part by replacing them but no luck, its shut down. I took a note of all the corroded components & viewed under microscope but no broken trace or such, all connections & soldering seem to be good.Comment
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Re: 820-00165-A logic board MacBook Air
Ok., I figured out why was it shutting off automatically after a few moments. Actually there was a slight corrosion on the BIOS chip too & the pin 5 trace was broken to the resistence. Upon a cleanup & installation of the BIOS chip from a donor board, all works fine & does not shut down any more. I installed it in the unit with its SSD, it OS boots up half the way & hangs up. Even with my know good OS it does the same, just hangs up after half OS boot. Any reason why, or any tips on this, do you think the BIOS chip from the donor is bad??? Thanks for all the help anyways.Comment
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Re: 820-00165-A logic board MacBook Air
You have to clean ME region.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: 820-00165-A logic board MacBook Air
Thanks I will do so...Comment
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Re: 820-00165-A logic board MacBook Air
I did the ME Region clean.... I got the clean BIOS program from Badcaps site. Now what happens, I get all the Voltages, CPU core 1.5, 3.3, 5V & all, I observe that the CPU is running in the background as it get hot but still there is no fan spin & no display. I get 5V on pin 1 of J6000. Have I missed certain rail voltage which I have not come across? Your help will be much appreciated. ThanksComment
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Re: 820-00165-A logic board MacBook Air
I'm confused. You said it was turning on but it was hanging while booting macOS.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Hi everyone! I'm trying to fix my black screen / failed U8900 GPU v-core on my Mid-2012 Macbook Pro 15" Retinaby doing a rework/reflow of the chip (once I determine that's the real issue; but it likely is).
I've been disabling the GPU in NVRAM for a few years... but it's just time for a better solution.
I'm new to soldering but the only feasible way to fix this issue is to do something myself.
MY QUESTION:
I've been seeing some people (on this forum mostly) run into issues with the logic board needing a serial number or it being deactivated (?)... -
Good day all,
I got a 2007 MacBook from a friend. The fan was not working so it was overheating.
Once the fan was swapped, I installed an OS and it worked fine.
The board had quite a few corroded spots so I removed it, touched those spots with a soldering iron, washed the board in PCB cleaning fluid (I've done that many times), rinsed it with distilled water, dried it etc.
Unfortunately it doesn't work anymore. It does turn on, fan spins, power LED turns on. But no picture.
If I see that right, I have missed VCORE on L7100 (page 59).... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi all!
This is my first post and also one of my first "deep dives" into electronic repair. I'm used to doing basic tasks with computers, like SSD/CPU replacement, thermal past re-application, etc. So here's the story...
I have a MacBook Air M1 that I bought to repair (I know, I'm weird; though I'm a CompSci major and want to learn more
, and it will not display anything on the internal display. I have verified that there's no backlight, as I booted the laptop and shined a flashlight on it and there's no display; it does completely boot up, and shows fine on an external...
11-04-2024, 06:36 PM -
Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
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