Recent content by Electrontechnician

Just few minutes ago, diagnosed a iphone 7 plus DOA. Checked USB voltage is good on the test point, test battery hooked up will activate the iphone and will charge the battery at 0.9xxA. With failed battery was zero current via charging cord. There was service history on this, there was 2...

Update, PCB heater is real needed here: I just had to do a Samsung Galaxy Tab E 9.6 tablet charging port. No matter how, I cannot do the soldering at all with safe temps, since the PCB has so much copper in it, that it acted like heatsink. Even at 400F with hot air, the old port will not budge...

I have looked around there are two types: Spot heater (from under) using hot air via 1" or 2'" dia "round salt shaker holes" or planar heater (many types) that heats over large area of PCB. Is spot heater I thought would fit the bill? Goal for our SMD rework for repairs, using hot air and...

How do you get this 1-2 A constant current setting enabled? The documentation is poor. Cheers, Jason

iphone 6 plus had M1 jumper installed and meson IC replaced did restored touch functionality. This was for touch disease repair. But I have a new problem: Either cold boot right after plugging battery in or hard reboot using power and home button combo sometimes get into lock screen with...

Might sound so basic even with my years of electronics repair experience with consumer electronics, and with learning to deal with this small that is found in cellphones recently, what is best method to wet the soldering tip properly without beading up or not wetting? Second, question how one...

I have the (circuit specialists pps2116a) power supply that Rossmanngroup uses for finding shorts but no matter how I do, would not output watts at all into virtual short typically around 0.3 ohms. Happens every time when I have VCC_MAIN short and now have IR camera on hand but not useful...

Was that latex paint? That contains water and is also conductive due to many constitutions in that paint.

Is there a way to clean off the ZXW's warts (infections) or accept way it is?

Had a loop with old battery on a 5, similar to 5s, Try good battery and inspect other's work by checking as others had suggested. Cheers,

Usually one pin is for communication and other one for temperature monitoring unless I'm mistaken. Other two is ground and battery +

Be careful with enameled wires, the insulation is rather easily nicked on sharp edge of the covers, I'd put some green mask around that for extra protection. Green mask does not cure well if the circuit board is dirty with flux. After completing wire jumper repairs, give the circuit board a...

This 5 was dumb fix. Happy to report now :) New flex was defective and came from Tech, I have low opinion of these parts from Tech since had 3 screens with pressure spot that appears when assembled, one of same three also died when trying to get that spot to disappear (searching for anything...

Have a iphone 5 will run off the battery's charge using wake/power button but will not charge the battery. Also with lightning cable will not power iphone and will not detect or prompt boot when lightning is plugged in, no current shown. I know I'm new at learning the "common" faults of...

I could not help you, but have tried carefully both clean the flux and wick off excess solder then wet the area with bit of alcohol to see what looks like? Remember you can have blind feed through too. PCB speak called vias. Cheers,