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Hello way back and this time we have a
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nice laptop to repair. This is a Lenovo
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Idea Pad Slim 5
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and I can see the laptop just hurt.
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They are sending me good laptops for
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repair.
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Anyway, the problem with this one, the
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customer open a ticket and he's saying
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actually the laptop is powering on or
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low life u it has left but doesn't
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charge. When checking on inline type-c
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meter again is saying 20 volts but no
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accepting power. At some point we got 5
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volts and accepting power. a gentleman
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called Dale and indeed we have a email
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and he explained me basically the same
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um the same behavior of the laptop. So
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what do I think? Can we help Dale?
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Charging ports. He sent me charging port
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but we don't need them because he said
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20 volts. So the PD controller is fine.
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The charging port is fine.
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But it's very nice to see when uh you
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know the customer is sending you even
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the charging ports. This is a computer
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business by the way. I will say let's
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plug the charger and see if it's
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charging. Let me take this out
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and this. Let me grab a charger. So,
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plug in the charger
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and
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the meter is coming on 19 volts. You can
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see there nothing what we can do. No,
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the PD controller is fine. No, the fault
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is the fault is somewhere else.
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Where can we default? On the power
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supply which is creating the main power
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L and also it's charging the battery.
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Yeah, there is the problem.
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So let's uh open the laptop quickly. We
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seen 20 volts but we know current. Yeah.
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Also don't forget this is a Lenovo. Not
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sure. I don't think I repaired this
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board before.
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What screws are here?
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Bulanova it's well known having you know
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the felling monsters on the board
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can be that that issue also
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we have a case today like 10 minutes 10
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15 minutes ago
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uh with a gentleman on discord and he is
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saying has a Lenovo he replaced the PD
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controller has 20 volts but he's taking
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no current. You can see 20 volts in no
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current. Then he's attaching the picture
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and when I check the picture Yeah.
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actually like no MOSFETs. There were not
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no MOSFETs on the on the on the
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motherboard because the MOSFETs fell
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down. Yeah. So he knew where the MOSFETs
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are. He said the MOSFETs went to the
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ninth dimension.
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Okay. Happily. So the MOSFETs are
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falling down then you can't find the
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MOSFETs. Yeah, I mean those problems are
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so common. Of course I advise him to do
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like a professional repair and you know
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just solder two bridges there and yeah
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you fix it. Don't bother with the
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MOSFETs and the laptop. It's open.
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Yeah, that's a nice motherboard.
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But like I said, I uh I don't remember
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to see this motherboard before.
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So check here. Yeah. Check here. Uh
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we spoke we made videos about the Yeah.
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Can you spot a coil with four MOSFETs?
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No, you can't. Anyway, can you spot a
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coil with two dual MOSFETs? Yeah, we
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can.
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Let me unplug the battery.
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You have like a big coil because the
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coil creating a main power rail is big.
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So you have a big coil with two dual
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MOSFETs. You can see there. Yeah.
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Yeah, that's the one. Look.
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Coil to dual MOSFETs.
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Now, let's plug the charger and let's
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check the voltage. So, this power supply
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has to take the voltage which is coming
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from the USBC 20 volts and has to output
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the battery voltage.
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The meter is coming only 20 volts. Yeah,
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but you can't see it. Sorry. The meter
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is coming only 20 volts. Let's check the
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the voltage at the input of that power
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supply. Yeah,
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very simple.
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So, one is the input, one is the output.
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I'm assuming this is the output here.
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But the input should be here. And here
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we have
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here we have 0 volt.
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I will say let's go and check under the
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microscope. Yeah, we go. I can't see
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anything. So under the microscope I
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checked there you have the dual MOSFET
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then you have a capacitor a current
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sensor so definitely here should be 20
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and it's not or maybe this is the input
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on this case 20 has to be here but it's
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not it's 10.5 which is the battery
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voltage. Yeah. So this is the output you
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can see it's a dual MOSFET has two gates
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and this one it's a dual MOSFET has two
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gates. So you see the problem is not
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even here
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and you'll say sorry but yeah but I
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don't believe you. I mean you can say a
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lot of things which I don't understand
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but I still don't believe you. We can
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check that. Yeah. So if I'm right
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if we are coming with a power supply
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with 20 volts on the same point on the
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same spot 19 volts. Yeah.
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So same spot I said here. Okay.
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and
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not sure what's what is happening.
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What was that? One second. I don't have
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current. One second.
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Okay, let's try that one more time.
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It's taking 3.2 amps and 1.7 volts.
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Okay, I take my words back.
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Um the the the input is shorted.
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But that's how you can check. Yeah. So
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we are taking the mind out from the PD
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controller. So the PD controller is not
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delivering voltage because here is short
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right. So here we ground check check the
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zero ohms. So here is short.
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Then uh of course here is short. Then of
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course if you are checking the MOSFETs
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because here is ground. If you check the
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MOSFET from here to here is short zero
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ohms. Check there. So here is something
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shorted
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but we don't know what. So how we can
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find out what is shorted
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thermal camera of course
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let's bring the the terminal camera
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because you'll say n sorry is the moset
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is shorted but you don't know that
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that's the thing you don't know that and
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you cannot assume you have to be sure
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I'm not going to replace that moet
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uh based on assump assumption so
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lowering the the power supply voltage to
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like one volt
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Okay, a little bit of current
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and uh we have the thermal camera.
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Great. Coming with current here. Uh
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something is getting hot. Check there.
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What is that?
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Wait, it's a capacitor. One second.
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No way. This is a capacitor job. I
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really had like high expectation from
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this repair because it's coming from a
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computer shop and I said must be
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complicated
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but anyway coming with current here
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and what is getting hot
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one of this
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they're not even cracked you can see
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that let me lower the current
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so lowering the current now we can spot
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better you can See that?
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We can spot better.
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This one. Wait, which one? This one? No,
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it's not this one. Is this one?
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It must be this one.
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Let's comb with some alcohol
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with alcohol here.
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So, which capacitor is getting
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evaporated? The first one, you can see
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the first one is dry already. Yeah. So
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that capacitor is gone. Uh what will
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happen now is better to not see
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but you know say hello to my little
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friend. There is one more capacitor. So
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we are fine.
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What do you think about that? And now if
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we are connecting the battery
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connecting the charger and the meter is
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coming on. Charging light. You can't see
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a charging light. It's taking 200
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milliamps. That's the pre-charge
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current.
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Let's wait for the laptop.
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200 milliamps.
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3.6 amps. See, it's working. I can't
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believe. And we cannot use the customer
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charging ports because the charging port
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is fine. Yeah. The other charging port.
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This one. Yeah. Okay.
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We have the charging light. is taking
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3.6 hours.
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I mean we made a video
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special dedicated for this case. Yeah.
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Like this this scenario this schematic
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like you have USBC PD controller then
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you have the power supply which is
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creating the main power rail and I
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explain it's so easy to be found. I mean
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you have a coil and two dual MOSFETs. So
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you have 20 volts on the PD controller.
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It's working. Then you have the power
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supply which is creating the main power
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and charging the battery on the same
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time
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and it's not charging. Okay. But I have
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20. Why is not charging? Because this
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power supply which is creating a main
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power is not working. But why is not
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working? Because it's not taking the 20
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volts from the PD controller because
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it's a shorted capacitor at the input.
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Yeah. So now if I check uh the output of
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this power supply.
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So checking the output I said here
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and you can see the main power is the
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battery voltage and obviously the main
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power voltage is going up on the same
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way like the battery is charging. Yeah.
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And it's working fine. So this power
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supply is now outputting a constant
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voltage. It's outputting a constant
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current. Okay. So just ignore the
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laptop. Just think this is the charging
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circuit and charging the battery. So it
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will provide a constant current. So the
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laptop it will take power
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from uh from basically this connection
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from this power supply to the battery.
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Yeah. You disconnect the charger, you
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have voltage from the battery, current.
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You plug the charger is coming from this
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power supply. Really simple. I mean I
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don't like the design, don't get me
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wrong. It should be better like how it
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was before. Just forget about this power
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supply and connect the 20 volts from the
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PD controller to the main power
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and you skip this. Yeah, you skip this.
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Skipping this is like you know you lower
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the probability to have a fault. You
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remember like the old like the old
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design old design you don't have this 20
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volts straight to the main portal. The
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main portal is 20 volts. Then you have a
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charging circuit to the battery and
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let's say the charging circuit is
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getting faulty. You will say okay sorry
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if you have the old design the charging
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circuit can get faulty can get faulty
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but you plug the charger and the laptop
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is working with the power from the
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charger you still have a working laptop.
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I mean I understand it will not charge
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but it will still be working.
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So yeah like I said every time rising
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the complexity you rise the you know
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probability to be to have a fold there.
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Anyway, I'm happy I held the customer,
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Dale, right? Yeah. Yeah, that's the
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that's the gentleman. Um, happy I held
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them.
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We didn't have to replace the the USB
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port.
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Yeah, it was quite an easy job, so not
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sure what shall I say. Well, maybe next
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time we'll have a more complicated one.
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Anyway, I'm going to stop here. I will
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say thank you for watching. you know,
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like, subscribe if you like the video,
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and see you on the next one. Bye. Hey,
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if you find my content being helpful,
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don't forget you can support this
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channel by pressing the join button, and
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you can get instantly access to our
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cool collection, and uh Discord private
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channels for support with your repairs.
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Also, you can have a look on our United
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