global Laptop and motherboard repair tutorial

Motherboard Repair ABOUT THE PCB The Laptops motherboard or PCB which stands for Printed Circuit Board is made up of layers (it isn’t just a thick green plastic board). These layers will be ―layeredǁ with traces. The traces are copper ―wiresǁ though not all traces are ―wireǁ that travel all throughout the board. Once the Layers and Traces are Set and the board Overcoat is Applied, The Holes or Lands are applied. All are drilled or laser etched. Then contact pads are added to the holes. Some will have only surface pads, and some will have c-caps and lands that go through the hole and out to the opposite side with a contact pad attached to both sides and having a contact ―wallǁ through the entire wall of the hole. The purpose of the ―wallǁ in the center of the hole is to make contact with the trace inside the board layers corresponding to the holes positioning on the PCB. The Laptops Motherboard will be colored Green (some are blue), Always having 2 shades of green (or blue); a light green/blue and a dark green/blue. The dark green being the ―baseǁ board color and the light green printed on to indicate Trace paths and component sections. Then you will see white lines printed all over the board which will correspond with the schematics data on the board component layout. The manufacturers stamp the lines in position to diagram-out the component part numbers; and printed labeling; for every component. ABOUT LAPTOP SCHEMATICS http://www.laptopschematic.com/ will have a lot of Schematics available for you http://www.eserviceinfo.com/index.php?what=search2&sear chstring=Laptop+Motherboard+Schematic is another place to obtain Schematics for Laptop PCBs http://laptop-schematics.com/ another great place for schematics http://notebookschematic.com/?tag=kt2-motherboardschematic Try here as well Laptop motherboard Schematics sheets are a valuable tool in laptop repair and will be needed for certain motherboard repairs. The schematics will be the ―blueprintsǁ of the motherboard and its layers. It will show you the components location, the components power rating, and if it runs in a series, it will reveal that also. When repairing the motherboard, you will refer to the schematics sheet when you can both visually see the damaged component, and also when you can’t see any faults. The schematics sheet will help you when trace re-routing is needed by showing you all surrounding areas (all sides and beneath area in question). If you can visually see the faulty component, the schematics sheet will tell you the exact part name and its rating. This information will allow you to properly test the fault and properly test post-repair for continuity. MOTHERBOARD REPAIRING TECHNIQUES Let’s say, for instance, that the laptop had a loss of Audio, and you have already determined that the speakers themselves are not the issue. You can look at the motherboard schematics sheet block diagram to locate the path of the onboard audio and locate all components on that path. This will allow you to hopefully locate if there is a fault. The audio will travel from the Southbridge, or the GPU/Southbridge, and you will see it branch out to different controller sections, like the amplifier, the microphone, the audio jacks/modem etc… Each section having its own set of components like voltage regulators, resistors, capacitors, controller ICs, diodes etc… Knowing the faulty components location in relevance to all other components will help you in determining any hidden faults and help you better direct your testing instead of having to test the entire motherboard.

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