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Website URL: www.laptoptrainingcourses.com
Saturday, May 12, 2012
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Become Expert In Laptop Motherboard RepairClickBank Marketplace Description:
American Trained Expert Takes You Step By Step Through Repairing Laptop Mb. Diagnosing Faults,troubleshooting Motherboard Power Problems, Upgrading, Component Level Repair, Removing Ics. Affiliates Earn 50% Commission - Excellent Product,high ConversionsCategory name:
Computers / Internet
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laptop chip level training, chip level repair, pc repair, notebook repair, laptop training, Computer PC Training, Laptop Chip Level Repair, Component Level Repair, Notebook Repair, IT expert Computer repair, Notebook Repair, Motherboard Repair, Hardware Training, how to fix Computers, Tablet pc RepairWebsite META Title:
Laptop Repair Training Courses Advanced Laptop Chip Level Motherboard Repair - Home
Website META Description:
This is a fully comprehensive instructional course in getting into the business of repairing all makes of laptops And Computers.Learn Step By Step How To Repair Laptop Motherboard By IBM Trained Certified Expert.
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1. system power: 3V, 5V all presented - ok
2. NBSWON signal: 3.3V presented - ok
3. press power button, NBSWON pull down to 0V, ok
4. check DNBSWON while press power button, no response. - problem.
in here I made a mistake, I didn't pay attention of the voltage of DNBSWON, this mistake waste me the next few days time. It should be 3.3V, but only about 1V.
Change EC as usual, because I thought the EC has problem. Then the big trouble comes - it auto power up once I plug in the power but stop in 0.04A current. Check and find no S5_ON signal, which indicate south bridge has problem, so change south bridge. But still same problem and still no S5_ON. I find that the EC I change is kb3926A rather than kb3926C. In most case, this is no problem but in very rare occation...
So I find a 3926C and put on. Now the motherboard is back to the same problem while I first start to check! So I change a wrong EC and this time I change a correct one, and also EC has no problem!
Because EC will start to read bios once the power plug in(not as people think, once you press power button). I check BIOS chip, BIOS_CS should have a countinue wave form but it just one stright line. BIOS chip is faulty, I replace the BIOS chip and it works perfect.