Re: new70 5891p motherboard acer 5742 not charging
So I am giving it a try again and just comparing the voltages between the working mainboard and the faulty one.
I am currently stuck searching for PR298 (or any PRXXX for that matter) on the mainboard.
I figured those must be resistors and there seem to be resistors without labels.
So the question is: how can i even find out which resistor is connected with PU18 if there are plenty of them and they are not labeled?
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Re: new70 5891p motherboard acer 5742 not charging
Unfortunately not.
I kind of want to repair this mainboard because back then i bought some stuff just for this project... so I am still open for suggestions.
As i wrote earlyer, i've got a working board from which i could desolder something if i could identify this as the faulty component.
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Re: new70 5891p motherboard acer 5742 not charging
Hi all,
i desoldered the PU18 IC and soldered a new one and i get the same voltages, so it seems its not this particular IC which doesnt work properly.
Can anyone help me identify possible other ICs which could be damaged? I tried to learn it but i cant read schematics yet.
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Re: new70 5891p motherboard acer 5742 not charging
Hi everyone,
i can desolder and resolder components from my old (working) maindboard to the new one (which doesnt charge).
But since i cant read the schematics i dont know which components to check next to identify the faulty component.
So im trying to get some attention one last time
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Re: new70 5891p motherboard acer 5742 not charging
Hello farooq,
i only had time today to check this..
PQ61:
On the side where there is only 1 pin, it has 7,12v. On the other side 2 pins have 0v.
PQ62:
All pins have 19v.
PR351:
On both sides its 19v.
I did not understand what you meant with "after you check src to battery".
Is the info above enough to say if any part is damaged?
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Re: new70 5891p motherboard acer 5742 not charging
HI,
so i found out i can use any place where a screw driver goes in as ground.
Here are the results from the faulty mainboard:
1. 0
2. 3.22
3. 0
4. 0
5. 7.4
6. 3.15
7. 4.8
8. 18.9
I got a healthy mainboard here so i checked there too:
1. 3.2
2. 3.2
3. 3.6
4. 0
5. 7.6
6. 3.16
7. 4.8
8. 18.9
What does this mean? I already tried to clean up a bit where i think there was some kind of liquid...
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Re: new70 5891p motherboard acer 5742 not charging
Hi, sorry guys i didnt see you already answered here.
I was about to check that IC. Problem is that im new to using the multimeter and i need to know how to connect the cables of the multimeter to check the voltages of the pins. I assume one cable needs to touch the pins, but what does the other cable need to touch?
If you can answer here you can ignore my post from the other thread.
Edit: how do i know which numbers you mention correspond to which pins of the IC?
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Re: Acer Aspire 5742G - no power problem solved
Hi, i've got probably the same problem.
I bought a multimeter (use it for the first time) and i can tell the everything including the DC connection on the board is working fine (i could see 19,5V on the pins there).
Now i want to check the pins of the IC (PU18) since it seems like there was some liquid spoiled on that area. But since i use the multimeter only since few days i need to know how to use it for this pins. I know that one cable of the multimeter must touch the pins of the IC, but what does the second...
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