this is the first time that I m asking something on this forum and
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Jan 02, 2019 BOTH software packages lose a few brownie points for the complete inability to breakout windows. Most people only use one monitor but on a setup like ours (we use three), being able to arrange windows and save the workspace would be an awesome feature!You could have a schematic on one screen, the board view on another and other shop stuff open on the third.
I found a lot of useful things already but this time I have a question...
I m new with everything that comes about electronics and circuits and I m trying my best to learn in order to do some 'small' board repair.
Recently I learned more about how to read a logic board schematics (along with a board viewer software), but what it's not that clear to me is that on the PDF are not shown all the values of voltage and current that all the pins are supposed to have...
My question is, how do you know if by taking measurement with a multmeter a pin (resistor or capacitor and so on..) has the right value or not?
Thanks
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-P
Update
I m using a software called Landrex Test link, downloaded from here http://laptopserviz.bg/enview/bvsoft/
, would be nice to have a software that tells you all the properties of each pin
Update
Hi guys! first of all thank you for you answer ..
I took some measurements and I could trace some power rails such as PPBUS_G3H and some more. Then, I decided to choose a random pin on the board view which is the R9720, Net: BKL_ISEN4 (logic board K29). The values for this pin using my multmeter are Ohm 0.07, V 0.01. Looking on the schematic I can not determine the right values that this resistor has to have, most probably I m looking in a wrong way but I will be more then happy if you guys teach me.
Is it the POWER ALIASES another way to call the POWER SYSTEM ARCHITECTURE?
I m using a dead logic board that I bought to practice with the multmeter
PS: John I m in this forum thanks to the youtube school ;)
Update
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Hi John,
On the motherboard it says w89190EB56GCA K24 2.26G BETTER and it s a 2009 apple macbook pro motherboard. My intention is not to definitely fix the motherboard, first because it’s old and second because I bought it online as a motherboard that has backlight problems and I don t have the rest of the computer. I want to learn how this board circuit work and how to reveal damaged chip/R/C/L/F, hopefully, without be annoying but enjoying with you in this useful forum.
In the meanwhile I bought a damaged macbook air that I should get in this days, in this way at the end if I ll be able to fix it I will be much more self motivated to keep doing that.
I m trying to attach a screenshot so you can see where this resistance is located in the circuits .. I m not sure if I did well.
Back to the question, how do I know what is the right ohm of this resistance R9720?
Thanks
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Is this a good question?
Comments:
thats a hard question to answer, what board view software are you using?
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What is the model number of the board. No the power system architecture shows you how the travel powers around the board and Power aliases are the different power rails at R9720 your looking for it's ohm measurement so you put both leads on opposite sides . Important ----Anytime you checking on both sides of the resistor with both leads testing unplug all power from machine including battery. When power is present in some form you need at least one lead on ground screw to not short the component or chip, it will arch on you too if your probes are to close to another component you need fine pin test leads and steady hands, regular probes can cause problems on board if your not skilled. Whats the problem of the board ?
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The schematic will tell you do you see at bottom of R9720 on schematic ? there is a 0 or a 10 and the line squiggles? That is the measurement it should be in Ohms the % below means it can be in the in a tolerance of that higher or lower is ok within that. Measure R9717 through R9722 they should all be at 0ohms .