We need to read circuits before injecting, other wise we don't learn

We need to read circuits before injecting, other wise we don't learn - LFC

Рет қаралды 17,388

3 ай бұрын

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Пікірлер: 72

@karolkrasinski8947

I am not too sure if it has to be so complicated. I understand the idea of being careful. Let'say the main power rail is shorted by the faulty mosfet on the cpu power supply. Someone comes with the voltage and injects 19v killing the CPU completely (lets assume CPU survived the initial fault), Obviously we need to be careful not to do that. But is it not easier to just inject lets say 0.9V 1A into tbe short? If we have dead short and thermal camera we will see something getting hot. Also with 0.9V even if short goes trough cpu or gpu we won't damage anything. This kind of workflow saves time and its safe.

@Hellhound604

Question: why not use a milliohm meter to locate the area with the lowest resistance on the rail, and do the injection on that point? I know Voltage-injection is a very powerful tool, but you need to know what you are doing. I always shudder when I see people just blindly grabbing their thermal camera, and start injecting voltage at any point on the rail they measure the short. First locate the area of the short and inject there.

@reggiedixon2

Maybe the real voltage injection was the friends we made along the way?

@Tech-Relief

You need some good quality hot tweezers I would recommend ATTEN tweezers. I know hot air works most of the time but hot tweezers would cause a lot less heat stress...

@clems6989 Күн бұрын

As another option you can zero in on the shorted component using a millii-ohm meter as well....

@bartoldenhof9377

"The batery is unplugged." That's probably why it didn't start charging the batery this time :)

@AzuaraRuiz-ot3tt

How many CPUs, APUs, Chipsets did I burn myself before seeing your content? Please, I beg everyone, no one dares to ask me that. Thank you very much Graham for sharing your knowledge with us. All the best.

@aerynsunsrustchannel1783

I caught this one 11 minutes after it was posted. Cool. Thanks for helping us learn with you.

@jeremysolmonson4890

"It's just a little airborne. It's still good. It's still good." ROFL!!!

@geneirwin645

I have seen those jumpers on lots of motherboards, usually they look like an elongated solder blob with no component. I suspect they are to allow you to isolate portions of the power rail to help narrow down where shorts are. You can look those up and you might discover they are in sections of the power rail, and if you clean the solder from one, it will "cut out" the section of the power rail and isolate it, allowing you to narrow down the section with the short.

@gendragongfly

To add to the checklist: Check resistance between the different rails in both directions. This is to make sure the resistance is high enough that the current won't flow to ground through another rail. This can happen if more then one component is shorted, for instance a shorted separation diode in combination with a shorted capacitor.

@als1035

Using the schematic to isolate areas on the board to look at with injection reduces the time it takes to find the problem. Good work and great troubleshooting!