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Re: A1990 MBP 15" 2018 No Power
Odd however all the ports are pulling the same voltage all the way through. Same amps as well. I am kind of confusedsigpic
MEOWING IN THE IMPOSSIBLE UNIVERSE!Comment
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MEOWING IN THE IMPOSSIBLE UNIVERSE!Comment
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Re: A1990 MBP 15" 2018 No Power
mon2 any thoughts?sigpic
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Re: A1990 MBP 15" 2018 No Power
See attached.
Your logic board has a CD3215 @ U3200 that is mated with a local SPI flash rom to boot the configuration for the power delivery interface.
Respectively, the ROM must be functional; with the correct data and then the power delivery feature will operate as required.
Check to see if there are voltages present to power the SPI ROM used to configure the CD3215 @ U3200. Check pin # 8 of U2890.
Do you see a clock pulse train on pin # 6 of U2890. Maybe you can check with a scope ? Otherwise, check the voltage with a meter.
Then check MISO (master in; slave out) & MOSI (master out; slave in) pins for voltages / scope activity.Attached FilesComment
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Re: A1990 MBP 15" 2018 No Power
Update:
u2890 Voltage readings
Pin 8 (3.3Volts)
Pin 6 (0 volts)
Pin 5 (0 Volts)
Pin 2 (0 volts)sigpic
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Re: A1990 MBP 15" 2018 No Power
Any suggestions? May need to remove this chip?sigpic
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Re: A1990 MBP 15" 2018 No Power
removed chip replaced with donor board same issue. RIPsigpic
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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!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅
I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
https://www.badcaps.net/forum/troubl...-hardware-devi... -
Hi all,
TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!
I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!
A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about... -
I want to know if I could hook up a solar panels to this boost converter would I have any issues doing and I would have issues what would they be
Adjustable Boost Power Supply DC-DC Constant Voltage Current Charging Module
https://www.ebay.com/itm/116497313155?var=416785404161
Here are some of the description from the eBay seller
The main parameters:
1. Product name: High-power non-isolated DC boost module power supply.
2. Product model: 100A2000W.
3. Input voltage: DC12V-60V.
4. Input current: 100A (maximum).... -
I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
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