Find A Short On Dead Apple Logic Board 820-00165-A using Flir One Thermal Camera Imager

[@davidshanlay]

Te simple repair do not need the flir or any thing. The buck converters are pulling down to the power to the CPU to 1.7V from 8.4V so it is hot. ISL6259AHRTZ. Use the multimeter and it is easy. Amazing video. What if the component is not shorted but the diode inside is not workig, no way to figure out with the thermal camera. You are measuring the wrong way that no correct diagnostic at all.

[@mengxyooj129]

the "CHIP" you say is actually a inductor to the cpu and any resistance to ground from a cpu line is always going to give you a low resistance.

[@mengxyooj129]

@Andrew_koala we're talking about """"LOGIC BOARD"""" CPU line to board ground. how many times did you fix a logic board and made it work? Very low resistance gives you no help on knowing if it's shorted by using resistance check on CPU circuit. The best is to find out that circuit line voltage and maximum current and feed it directly to see what's causing it shorting. Yes, it may be true on your part when working on 480v industrial to control side to PLC to automation and transformer converting 220v to 24dc for the PLC to automate and uses I/O for inputs and outputs for your SIEMENS or ALLAN BRADLEY but take out a board, (Circuit board specifically) ANY BOARD, and use one of your meters on (+) side (remember, CPU circuit side) and one to your ground and then tell me what you see on the multimeter.... go on and videotape it and show me that seeing "some resistance to none" is useful to troubleshoot your issue if CPU won't turn on. And yes especially on Apple's logic board, they don't have high resistance to ground on the CPU side, and do you know why Mr. Know it All? It's designed by concept. Concept of using ONLY tiny resistance resistor for voltage to pass with minimal current such as a 0-ohm resistor or up to 0.5-ohm resistance resistor (mainly on CPU VCORE circuit side) only and do you know why??? To prevent your high dollar MACBOOK from frying the CPU if people like you use cheap Amazon charger because any high current will automatically shot the 0-ohm resistor thus saving the CPU from frying and rather than replacing a near-impossible task of replacing CPU (which isn't viable) and instead your only replacing a 1 cent resistor. But anybody who fixes the apple logic board in here already knows that as soon as you plug in your let us say, 820-3115, you'll voltage drop on your power supply aka, instead of 12.6v you'll see something close to 12.4v ish. Hope you study well on my comments. If not, watch Louis Rossman videos as a courtesy from me.

[@darrenstrathdee7425]

No. 0.6 is a dead short. Its not the same as a low resistance. 0.6ohms is to low even for a cpu. It should not be that low.

[@mengxyooj129]

that board is actually could be good. you need to check all your SPI bus termination line and see if any probe points are corroded. I bet you're missing the rail pp5v_rs4 line

[@j.lietka9406]

keep asking, where can I find the 820-xxxx # on an A1502 pro L/B? thanks

[@supreme713-]

Do you have to take the board out to do it?

[@chinarello2928]

Yes, not a big job.

[@Remontapple]

Thanks 🙏 👌👋

[@avinashnsa89]

Getting 1.2 volts on L7130 pin 2 where i have to check now

[@gsmnsd]

820-00165-a bin file i need sir

[@Akkarsollum]

My MacBook Pro 13 late 2012 works and running. Yet after being water damage, the backlight doesn’t turn on but the screen is visible at a low brightness. I use a HDMI cable to connect to my smart tv to see if works and it works completely fine. Do you know a couple of a solutions to the problem?

[@fixapplenow]

Most likely corrosion around the backlight driver

[@Akkarsollum]

Fix Apple Now should I replace the display inverter, or should I replace a fuse? If it is not corrosion.

[@fixapplenow]

Akkarsollum you need to do visual inspection first. There is no inverter that you can replace. Fuse is possible, but it rarely fails on this model

[@Akkarsollum]

Fix Apple Now awesome, do I need equipment to replace the fuse or any components if the voltage is not going through a part?

[@fixapplenow]

Akkarsollum yes, you would need a soldering iron and maybe hot air station