Master's Help Required Ubiquiti UAP-AC-M-PRO No Power Power Over Ethernet PD Interface and PWM Controller IC : LM5072MH-80
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Q10 is not soldered
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Yes Desoldering For Test Mosfet OkComment
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had you check the diodes for any shorts?Comment
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not found any short or change valueComment
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Last time I had something similar with an AC-PRO, spent hours why there was no any voltage flowing. I nearly gave up and just tried to dump the SPI/BIOS for future use. Turns out to be corrupted. Flashed a copy of bios from a spare AC-PRO and was working fine again.Comment
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do you have Bios dump ..?Comment
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First of all, measure voltage across the bridge rectifiers and see if you get 48V going into LM5072. Have you checked any shorts on the LM5072 itself - if so, take it off and checked for shorts around it and see if it still persists. Had a bad LM5072 on my previous fix on a different U6-LR - replacing fixed it.
If you're not getting any voltage from the 3.3V/5V from the UART pins then it's probably a bad LM5072 (or something else) and not the bios.
If you want to go ahead with SPI dump route, I suggest you create a (verified) full backup of your current SPI/BIOS dump (upload it here). What I've attached is for the UAP-AC-PRO (not the AC-M-PRO) so it's not going to work correctly or might not even work at all (Most likely will get Error A12 if you get in but it has different ethernet hardware) but you might be able to at least confirm that power works then find someone with a AC-M-PRO to get their SPI dump.Comment
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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... -
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 have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time...
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