First is i got this A1466 13” MacBook Air 2017 no power with power draw of 08-80ma. PM_SLP_S4_L is pulsing, If i remove R8111 and PM_SLP_S4_L comes back. no short on RAM power supply then i somehow maybe shorted the U5460 while probing removing the R7450 then i replace it from a donor i still get the pulsing PM_SLP_S4_L. then i tried to Flash a Working BIOS then boom it turned on so assemble it back then Stress test like heaven benchmark then turned on and off restart like basic testing it all passed then i just set aside for like 3 days then after that i checked it again boom its back to its problem again same power draw and pulsing. what did i do wrong?? bios again is corrupted?? i did nothing while its in the shelves??
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Re: 820-00165 no power, 08-80ma, PM_SLP_S4_L is pulsing.
Had this problem with this board many times, change bios chip, they are very prone to failure.I don't provide help for people using CH341A and a clip. -
Re: 820-00165 no power, 08-80ma, PM_SLP_S4_L is pulsing.
Check for corrosion on the JTAG connector (J6100), that's a more likely cause. Also check termination resistors for corrosion etc around U6100 and the connecting resistors to the CPU (around middle of the board under the RAM). Can't say I've ever had a SPI BIOS chip go bad on these.Comment
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Re: 820-00165 no power, 08-80ma, PM_SLP_S4_L is pulsing.
HI!
I also had many voltages pulsing, isolated many of them. It didn't have water problems.
After reading many posts in many forums, i also read about bad bios and the possible symptom that the voltage is pulsing every 2sec. when i'm going to check the bios IC to replace with another, i saw a very tiny IC (U6101) right before the Bios IC that had debris all around it like it has taken water spill only in its body. I had to remove it, clean the board and decontaminated the IC pins with flux. After resoldered the board came back to life.
Thanks Everyone!Comment
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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 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... -
I'm rather new to repairing electronics, i do know the basics of most components but never actually repaired a PCB, but i want to change that.
So, i bought a faulty Sonos Play 1 speaker with the intention of finding the fault, and replace the damaged part.
Well, i did find the fault, i replaced parts that i thought caused the problem, but no-go.
The problem is a pulsing power supply, when i connect the mains to the board and hook up my thermal cam i see R306,307 and 308 getting warm, but i assume that's normal.
But, whats is not normal is the pulsing of resistor...
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