TechWizard

Got a PS4 Slim - motherboard model SAD-002 with no power after a possible lightning strike. No beeps, no lights, nothing....

Got an iPhone XR in the other day for a screen replacement. The screen was dropped and whatever it fell on, made a pretty...

Got a Nintendo Switch LCD FPC connector that is damaged and I need to find a compatible replacement from mouser, digikey,...

Switch had a damaged USB-C port with broken pins. Replaced the USB-C port with a new one and now it charges fine and...

I have a customer who has brought a DNX690HD car stereo to me to try and troubleshoot/fix for them. Car stereos are not my...

I have an iPhone 7 Plus that has never had previous repair. All Apple OEM parts remain intact. There are no signs of...

Got a tricky one here. Customer brought in an iPhone 7 that was dropped a few months back which caused the glass to break...

I have an iPad 3 WiFi only that came to me originally with a no charge problem. Upon visibly inspecting the charging port,...

Several possibilities here. The battery could have been damaged so it is not providing the required power to the board. You could try disconnecting the battery and plugging in your AC power adapter alone and try running the computer. The high temperatures inside the car may have warped or flexed the BGA solder connections underneath the Intel CPU or the soldered on memory module ICs just enough to cause them to not be solidly soldered to the motherboard - even causing what’s called “micro-fractures”. The process of “reflowing” may fix this problem, but without knowing for sure if that is what happened, it could make things worse. If it were me, I’d use a multimeter and try to measure power at key points on the board to see if it appears to be getting proper power. Measure the voltage coming out of the battery and at the battery connector when plugged in and on. You may be able to find schematics for the board if you Google the motherboard model number along with “schematics boardview”. That would...

Without the exact model of your mower, it’s sort of hard to help with any exact information, but check the PTO switch itself. It may have been damaged while you were connecting the battery. Failing that, I would check the clutch solenoid. Good luck. Also, this YouTube video might prove helpful in troubleshooting the PTO switch: https://www.youtube.com/watch?v=RLavJ6Qe...

To enter Safe Mode without a working power button, remove the entire top cover of the PS4 and look for the small gold square underneath where the power button sits. This is your power button. It responds to touch, so you can use your finger or a small plastic tool to press this gold square to power on the PS4, power it off, or enter Safe Mode. Once in Safe Mode, try updating the firmware as it suggested you do to see if it corrects the problem.

Launch a web browser and enter the IP address: 192.168.0.1 It should prompt for admin login. Default username is “admin” default password is blank. Now that you are logged into the router, you can change the default Wi-Fi password, the default admin password, or make any other changes to the router that you need.

You might want to open the phone again to double-check your connectors (battery, LCD, lightning dock connector, front camera flex). How was this phone damaged originally? Drop damage? Liquid damage? Run over with your car? Depending on what happened, you might have more damage to repair than just your damaged screen. I’d start with simply checking your connections. Open the phone and disconnect the battery first. Carefully lift the connectors and reseat them to ensure they all have a solid connection to the logic board. Without additional information or some diagnostic tools on your part, it’s difficult to say what the problem could be. Since you have already opened the phone to perform the screen replacement, the likely place to start troubleshooting is to go back and check your work.

To minimize further damage to the phone, it is recommended you power off your iPhone (and ideally, disconnect the battery) until you can repair the liquid damage. Continued use of the iPhone may cause additional damage to the phone that will only increase the cost of repair.

Install the new HDD as usual and boot to your El Capitan install USB. Enter Disk Utility and click your hard drive located on the left hand side to highlight it and then choose Erase Enter a name for your hard drive (default is “Macintosh HD” but you can name it whatever you want.) and choose your format (usually “Mac OS Extended (Journaled)”) and GUID partitioning table. Exit Disk Utility. Proceed to install macOS. Once installed, you will be asked if you wish to transfer data. Connect your old hard drive to the MacBook Pro and then choose “From a Mac, Time Machine backup, or another startup disk”. and click continue. Select the data you wish to transfer (typically everything), assign a password to the migrated user account, and then allow it to complete. Once complete, disconnect the external hard drive and you should be good to go.

It appears to be an MP28257 step-down converter. Here is the datasheet: http://pdf1.alldatasheet.com/datasheet-pdf/view/553778/MPS/MP28257.html

Due to liquid damage, it would be ideal if you ran the board through an ultrasonic cleaner and then replace the trackpad cable.

You will want to wick off the original solder and replace it with leaded solder. Apply flux and align the chip the best you can before using hot air on low air speed to solder the chip in place. You may need to go back and touch-up the pins with a soldering iron. You can check if you need to by using a fine tweezer and gently nudging each pin to see if it is soldered in place or not.