All right, so today I want to talk about a basic topic when it comes to troubleshooting some of these circuits. This is something that comes in handy if you haven't known good around. So, this is a machine that has no backlight on the screen, and it's something I've mentioned in a couple of prior videos, but it's not something that has its own dedicated video, and it should because this is a really basic concept in electronics, and it's something that's gonna help you along in your troubleshooting. So, let's say that we have a circuit that is supposed to create a certain amount of brightness for the screen, a certain amount of voltage for the screen, and it knows what the load of the screen is going to be. Let's say if we want to create 27 volts. Now, the output of a circuit can actually give you an idea of what's going on with it. So, here I'm gonna measure backlight output at a specific point in the circuit, and I get thirty nine point six volts. Now, this is where, again, one of the things that really helps me is having this whole pile of stuff that works well, some of it works, where I can just go, "Okay, what's that supposed to be?" and I measure it and I have an answer, and it kind of helps me with my thought process. So, I know that on a supporting machine when brightness is all the way up, I get 27 volts. So, why is my voltage 39.6? That means I should have more light, right? Now, what a lot of people will say is, "Oh, the screen must be broken," or that the light got blown out because the board was delivering too much voltage....
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