Please help me :(

[willy_andre]

Hi all...
i've tried so hard to understand how to read the schematics, looking for tutorial on the internet, but i have no luck, i know the components and the symbols but i can't figure where to start, for example; i have acer one 522 dead, but i dont know where the power circuit is, and how the electricity flow, could someone please help me to explain?

always wish for the lights

i have attach the schematic

[lezsimply]

Re: Please help me

You can start with page 28 DCIN/VIN DETECTOR. check PL1 if you have correct voltage. if voltage is present (VIN) you can proceed to page 30. check voltage which start from PD3 to PQ4 voltage must be present there.

[fddizon]

Re: Please help me

study basic electronics first before going to a serious motherboard repair

[JCIT]

Re: Please help me

There is an online course run by the Siva institute, I'm saving my pennies for it so I can take my little repair shop up a step.

http://www.sivainstitute.com/neweng/

[sparker1]

Re: Please help me

I'd like to do that too. His tutorials that he puts on the web have already helped me save a laptop from the dump. Good to see a few Aussies on the forum.

[willy_andre]

Re: Please help me

You can start with page 28 DCIN/VIN DETECTOR. check PL1 if you have correct voltage. if voltage is present (VIN) you can proceed to page 30. check voltage which start from PD3 to PQ4 voltage must be present there.

Oke thanks alot.. but i still wonder, does vin means it is the adaptor? cause i dont see jack there..

[lezsimply]

Re: Please help me

VIN is the output voltage of your adapter. look at the markings on the motherboard. PJP1 is the dc jack. voltage runs through PC1, PC2, PC3, PC4 and PL1 and has output voltage around 18v-20v. If this voltage is present there then you can go to page 30 to test furthermore.

By the way, have you had any experience in basic electronics or soldering? don't get me wrong I just wanted to know because laptop is not that easy to fix.

[willy_andre]

Re: Please help me

VIN is the output voltage of your adapter. look at the markings on the motherboard. PJP1 is the dc jack. voltage runs through PC1, PC2, PC3, PC4 and PL1 and has output voltage around 18v-20v. If this voltage is present there then you can go to page 30 to test furthermore.

By the way, have you had any experience in basic electronics or soldering? don't get me wrong I just wanted to know because laptop is not that easy to fix.

Thanks alot lezsimply thats very helpful., i usually fix laptop but not for the mainboard short problem, i usually ask the customers to bought a new One, but it is very expensive in my small town, i'v learn the tchnique of soldering and basic of electronics even though not much, so according to your experience, wich part should i begin first???

even they are not easy but i will never stop Learning, i hope u dont mind to help me if u can...

[sparker1]

Re: Please help me

Good luck. I think VIN means "voltage in". That's good because a lot of schematic lettering doesn't make such easy translation to english as far as I can tell.

[willy_andre]

Re: Please help me

Good luck. I think VIN means "voltage in". That's good because a lot of schematic lettering doesn't make such easy translation to english as far as I can tell.

Thanks sparker, but i need help now, where does the voltage convert to 5v and 3v, is it from dc-dc converter? and in my case where is it ( the converter) in the schematics?? I am sorry but i just want to know, i hope u dont get angry

[lezsimply]

Re: Please help me

if you have already confirmed that motherboard receives voltage from adapter, Turn to page 31. This is where 5v and 3.3v are produced. check PL6 for 3.3v and PL7 for 5v. If you are having a hard time identifying voltages you can check page 3.

[sparker1]

Re: Please help me

You probably need help from people with more knowledge than me. Lezsimply knows his stuff. I think the job of DC to DC conversion is done by buck converters http://en.wikipedia.org/wiki/Buck_converter and linear regulators. Page 27 of your schematic is headed as the DCC circuit. The components on that page have a product number - for instance U14 is a DMN3030LSS-13. With that number you can google (for instance U14 I get to http://diodes.com/datasheets/ds31261.pdf) their data characteristics and maybe you can test them for shorts/voltages. I am only a noob with this stuff so hopefully someone with more knowledge will help you out and correct any bad advice I may have given. By the way, the schemataic you have is passworded. This one isn't.

[lezsimply]

Re: Please help me

Sparker, I'm not also very good with this stuff I'm only sharing what I have learned from this forum. Joining this site helped me a lot and I thank everyone for it. In return, I helped others with the basics. In this area no matter what people say, little or not. The important thing is we helped and share. And if someone is wrong, its easily corrected

When I receive laptop with no power this is what I usually test.

-adapter
-dc jack
-regulator ic's
-bios
-shorts
-heating components
-burnt components

please feel free to add some

[willy_andre]

Re: Please help me

You probably need help from people with more knowledge than me. Lezsimply knows his stuff. I think the job of DC to DC conversion is done by buck converters http://en.wikipedia.org/wiki/Buck_converter and linear regulators. Page 27 of your schematic is headed as the DCC circuit. The components on that page have a product number - for instance U14 is a DMN3030LSS-13. With that number you can google (for instance U14 I get to http://diodes.com/datasheets/ds31261.pdf) their data characteristics and maybe you can test them for shorts/voltages. I am only a noob with this stuff so hopefully someone with more knowledge will help you out and correct any bad advice I may have given. By the way, the schemataic you have is passworded. This one isn't.

Thanks for the schematic sparker, but i dont understand my schematic is passworded, what are the different?? do u have link where i can download any schematics are not passworded?? I'm on my way Home to town right now, and will back to the laptop soon, trace for short, thanks

[sparker1]

Re: Please help me

When I went to open the PDF file of yours it requested a password. I did not have the password for it but one of the online pdf password remover sites cracked it for me. Good luck with your problem.

[willy_andre]

Re: Please help me

When I went to open the PDF file of yours it requested a password. I did not have the password for it but one of the online pdf password remover sites cracked it for me. Good luck with your problem.

I've check for the circuits, and i found PQ5 have input 19v and output 0,2v is that normal? Then i press the switch but the output is still 0,2v should i replace the PQ5?

[atsio]

Re: Please help me

PQ5 is the battery side FET. You should check all pins of PQ4 (You don't have to press the power button).

[willy_andre]

Re: Please help me

PQ5 is the battery side FET. You should check all pins of PQ4 (You don't have to press the power button).

Thanks atsio for the reply, but do i have to remove the PQ4 from the circuit first? because without removing the fet from circuit here is the result of measurement D=18v,S=18v,G=1,8v

[willy_andre]

Re: Please help me

the netbook is not totally dead, when the adapter is inserted, and press the switch, the power led is on, the fan spinning while but it stop and spin again and stop, then the power led is dead, the netbook is dead, and if the power button is pressed about three time(sometimes many time), the power led is on and the fan is spinning fast, but no display, is it because of gpu problem? i have try to connect it to the external monitor but still no display,hufft...

[atsio]

Re: Please help me

Probably.