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present knowledge of electronics. If you go through the fundamental
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move to the logics section. After you become comfortable
with power electronics the logic session follows . It is an intensive
coverage into the intricate details of chip-level service of the
laptops. This involves detailed circuit tracing , signal
analysis , replacement of SMD devices and all the tips and tricks our
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makes you confident enough to chip-level service the new
generation notebooks from Lenova , Compaq, HP , Toshiba ,Sony and the
Service Technicians entering into the Laptop training course must have experience in the following disciplines
- must be comfortable in using desktop systems and peripherals
- must have an above average knowledge about all the internal components and operation of the system
- comfortable with installing and managing various operating systems.
- managing the hard disk subsystem with formatting and partioning.
- installation and configuration of computer components like add-on devices
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Would love to know how you diagnose motherboards on a component level. What tools do you use?
I find it is very hard to explain this.
actually, it is very simple and can be described in two words: current
and singal. read the current change during booting tells
you where the machine stopped. check the singals on the different part
of motherboard tells what is wrong or what may missing.
Tools are: smd rework
station, bga rework station, power supply has current meter. all the
rest tools you can find in any radio tv repair shop.of
course all the datasheets for the components, especially the schematic
diagram, you will find it much difficult without it.
What are common faults on mainboards?
Do certain components fail? Is there a trend as to which parts fail quite often?
Different maker/model has different
common fault. Toshiba S1 is vga chip, and can't be repaired(well, almost
can't be repaired because the pcb quality is not very good
so successful rate is very low).
HP DV2000, 6000, 9000, compaq v3000, v6000, dell 1210, all those use
nvidia chips have problem on vga chip or north bridge. easy to repair
but have to make fan keep spinning after repaired, otherwise
will break down in 1 or 2 week again.
hp nx5000, cpu pwm chip dry joint. acer 290, cpu pwm dry joint.
hp dv1000, compaq m2000 protection circuit easy to blow up.
ibm t40 vga dry joint problem.
These are just few of them. every machine has its own common fault. but
dry joint is the common problem for all machines. Motherboard repair is
not as difficult as people thought, i think much easer
than repair a tv.
Dell 1525 Inspiron that says system does not recognize the installed battery this system will not charge the battery.
Charging battery in Dell laptop involves
two major chips: EC(or someone call it super IO), PWM chip for battery
charging. BIOS has no part of charging. Battery
communicate with EC through SMB(system management bus??) and EC controls
charging PWM. Fix charging problem is very hard in laptop repair, you
must fully understand schematics, where all the signals
come from and where to go.
Today's laptops are less and less with programmed EC, Dell 1525 has no programmed EC so it can be replaced with same model.
How i fix a DV6 with power problem. The problem of machine is it cannot power up at all.
Doing routine check:
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
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.
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