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820-3435-b. voltage is 8.6 on backlight line where the boost signal should be sent to. the ic is getting voltage in, the enable signal is present, the voltage divider resistors test as normal, the voltage on the dividers is also what it should be. the chip was burnt and there was dirt...

PPBUS G3H 8.6 VOLTAGE ON LCD BACKLIGHT BOOST 39V CHANGED BACKLIGHT IC, NO LUCK. NOT SURE WHAT I AM MISSING. any suggestions are welcomed. (did find a few resistors on PPVIN_S0SW_LCDBKLT that do not measure in ohms correctly, but i replaced them (and measured before i did) and its almost like...

820-2523-B NO PM_SLP_S4 PRESENT, ALL S5 POWER RAILS PRESENT IDK WHAT TO DO FROM HERE, green light (yes) charges battery idk i also believe that vr pwrgd delay was 0v as well idk what im missing/where to go from here. i tried finding a short but no luck *bought from ebay to practice on, previous...

820-3209-A liquid damage, powers on, chimes, turns off after 3-5 seconds board gets warm if you remove the ssd, it will not power off after 3-5 seconds if you try to boot from usb, it will power off again though to be clear, if you remove the ssd it will stay on fan seems to run high my question...

I'm gettn better at reballing iphone ICs but its still taking me too long to do it. Its taking me 2-4 tries to get balls on all the pads using solder paste. im putting the ic flat on the solder mat, then putting the stencil over the top, then adding paste, spreading it around until each hole...

yes i changed the battery, yes i inspected the battery connector, no signs of water damage i have a 6s that will be fully charged or near fully charged, then it just dies and acts as if the battery has no charge at all ive changed the battery, it doesnt help. the connector looks flawless, anyone...

green light= yes pp3v42 good/normal ppbus_g3h good/normal pp3v3_s5 good/normal pp5v5 good ppv3v3_s3 NOTHING HERE (ENABLE IS 3.3V On mosfet, but its a P mosfet, idk if that means the voltage should be lower than the output,) (ARE S3 LINES SUPPOSED TO SHOW BEFORE THE DEVICE POWERS UP?) no...

820-2327-a doesnt turn on, nothing on 3v3s5, u7200 has nothing on entrip (pin 6) for 3v3s5, resistor on entrip line is (r7272), problem is the schematic shows this resistor to be 57.6k, im getting a reading of 75k, BUT on the same model board that is working, on that same resistor i get a...

I am fixing my first macbook, and I found a few lines that have no power, but I do not really know what to do from there, I'm having trouble reading the schematics properly so I dont know where to backtrack to in order to hunt down the problem that is keeping these certain rails from getting...

i would like to inject voltages into a line, i know that you keep it at or under the voltage for that line... is there a certain type of wire used for this or ? also, im assuming you pick a point on the board, put your positive on it, negative on ground? do i have to adjust voltage and amps on...

NOOB QUESTIONS. Do I use a power supply to connect to the board? How? ( & other ?s) Hi, Im fairly new to diagnosing boards, and Ive mainly focused on iphone boards up to this point. on those boards you simply connect them to a power supply using a cable made for iphones, and then you can see a...