CPU Core supply measuring 0 Ohms usually means a dead CPU, except there "just" went something very wrong with your capacitor replacement. But it stongly looks like a typical high-side short.
Charging rail measuring 0 Ohms explains the not charging battery. However, from my understanding there is no point to proceed with the repair attempt. Even of you fix the problem in the charging circuit, you can't do anything for the CPU anymore.
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No BLON_OUT is likely the issue here. Make sure RN5501 is not internal shorted and that D5503 has not failed too. Clarify whether R5512 is present on the PCB and measure resistance to GND of RN5501 Pin 2 & 7 and of D5503 all pins.
Could be EC fault with some luck or something missed from visual observation.
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Bad Power Switch, Corrupt ME, Dead PCH, or something which was missed by measurements/observation.
Is the power switch reacting accordingly after press?
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Hello Bosscharles,
You seem to be working on the assumption that you can tell exactly what the problem is based on your observations alone.
Unfortunately, this does not usually work. In addition, it is quite possible that the error with the CMOS battery is a second error that is independent of the main problem. It is therefore quite possible that we are even making false assumptions here. Against this background, the observations are only one indicator of many and must never be seen as something from which one can already draw conclusions.
For this reason, as always,...
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I don't know whether there will be a solution to get rid of the melody, but regarding the fault itself, sure, a start at the fuse(s) near the display connector might be a reasonable start.
Follow the general rule to not unplug or plug anything with power applied (this applies to the main battery too). Other than that there will be various systematic approaches depending on the exact fault (no picture, no backlight, or even both not present), which you need to clarify next.
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If the board shows picture via HDMI then your first look should move to the internal panel/cable/connector.
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Sounds like "Backlight: Yes, Picture: No". Which is neither a expected nor a good outcome.
share a clear picture of the connector on the mainboard, without cable plugged. Don't forget to remove all power before unplugging the cable.
Then connect the display cable again and look for voltages at DCBATOUT_LCD, LCDVDD, BLON_OUT_C and LCD_BRIGHTNESS...
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You're saying, after replacing a capacitor, the laptop went from unstable to "dead" condition, including a shorted main power rail?
If so, hq pictures of this area please. I don't see any indication for a fault in the charging circuit tbh.
In my opinion something went horrible wrong during the task, or a PQH8601 which could have been damaged already, finally shorted out.
Is the RAM supply shorted too?
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Regarding your Measurements both DC-IN Mosfets are not internal shorted. ACDET, REGN, VCC and even ACOK (weird!) are present. So there is no obvious reason, that the DC-IN Mosfets don't get ACDRV signal.
Check internal resistance of PRB4 and Resistance to GND of charging controller pin 4. if they both measure okay, best advise in my opinion is to replace the charging controller.
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My friend, I don't want to make a showroom for myself here, but I probaby need to convince you that i am experienced on chip-level, working at this level for 4 years, running a repair business, and running a YT-Channel.
And without logical conclusions, you can't be succesful.
It is simple: if the tracks would be a issue here, they would already light up like a new year fireworks. But they don't, no?
I don't know how and from where you learned about these things, but voltage injection can not be seen as a static procedure. You always have to adapt to the circumstances....
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This is a Invalid argument, considering that you can't notice anything so far. More Amps is no problem. But more voltage might or might not turn the board into a no-fix.
When it takes 3Amps and nothing to spot, raise the Amps. When it takes 4Amps and nothing to spot, raise the Amps, and so on....
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Very odd measurements. The charging controller forces the battery to power the main power rail even if the charger present.
I think it is time to share pictures which shows the actual physical situation on the PCB.
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To check a Mosfet is a simple task. You simply set the multimeter in resistance mode and measure between Source and Drain, Source and Gate & Drain and Gate. Pay attention, that the low-side Mosfet will measure low resistance between Source and Drain by design. The advise would be to remove the Mosfet from the circuit to perform a reasonable measurement. No value should be below KiloOhms.
It would be helpful to know the resistance to GND of +VDDCR_VGFX and +VDDCR_CPU....
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Take a picture of the whole board, remlve all power and collect resistance to GND measurements of each inductor present (any pad). Then repeat the same in DC voltage Mode, this time with power applied of course (plug the charger). Write the values in the picture and share it here.
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Is the battery good and does it the same when it boots from battery?
Interestingly, the most important information came at the end. You are not considering that the problem originates there (GPU)? Any history known about when was the GPU replaced and whether the issue was present since then?
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Agree and I'd call this bad luck otherwise, since the most likely reason for the actual problem would be that something happened with the PCH. If PLT_RST# is indeed deasserted then you should concentrate on L_VDDEN_PCH after cable replacement.
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