Hp Laptop Motherboard

I can diagnose most any pc problems down to the component level.... thats really easy.

And without a SMD or BGA rework station I likely cannot fix a ton of issues since northbridge problems are fairly common.

Things that are likely worth solving:

Bad capacitors. Decently common and the parts only cost a few cents.
Most of the ICs on board... 4-20 pin jobbies such as the power ic do fail and are swappable for less than a buck or so
Blown fuses. Easy to diagnose easy to replace. This is a definite.
Any and all damaged jacks. Power and audio being the most commonly broken.
Resistors. easy to find easy to replace. cost is in pennies
Transistors and diodes can be more problematic to diagnose and fix but they too are cheap and swappable with just a soldering iron.
Obviously i can swap cpus so I should be able to diagnose that as well.

I can't fix:
Northbridge or the vga chip without a BGA rework station so that is out of the question even if i have to be able to diagnose it


I found an example of the dude that does pretty much what is expected of me:


"Machine: HP G6000(same mainboard as V6000)
Problem: not power up

The machine has been water damaged. It does not have system standby power, which are 3V and 5V.

Check Max8724(the battery charging chip) first, because to make system has standby power this chip must work correctly. This is a 28 pin chip, we only need to test 1, 2, 4, 8, 10, 11 pin. They are VIN(main power for chip), LDO(provide 3.3V for chip itself in order to set REF voltage, also provide signal to drive 2 MOS to charge battery), REF(set reference voltage of the chip), SHDN#(enable/disable chip, a switch), ACIN(indicate the power supply has plugged in), ACOK#(power adaptor ok with mainboard).

Everything ok except 10 pin, ACIN is 0V. This is incorrect, mainboard doesn’t detect there is an adaptor! Trace it backward and find it is very simple – mainboard use 2 resistors to pull the input voltage(19V, directly from dc socket) down to about 4V, so test the first resistor and find it opened. Change it and 3V/5V power come up and mainboard be able to switch on.

Then the trouble start when I try to charge the battery. The charging current never go beyond 0.15A and after 10 seconds the charging light start to flashing. Also can’t switch on from battery. First, change Max8724, still same problem. Next check all the resistors around max8724 and change it if it has any sign of watering, still no good. Then change KB3926(EC/KBC, chip monitors the statue of battery), still same. This is the fault that I never dealt with before.

Decide to check MBDATA and MBCLCK, 2 signals that send battery information from battery to KB3926 before I give up. I find the MBDATA is short!

Finally, find there are 2 pins stick together on CN10(the connector of multimedia switch board). Fix it and it start to charging battery. Switch on with power adaptor, ok. Remove the power adaptor once switch on, battery keep the mainboard running, ok. But still can’t switch on from battery once remove the power adaptor. Think, think, do I miss something here or there? Oh, the CMOS battery not installed, put the CMOS battery back and everything work perfectly. The battery part of troubleshooting takes me about 3 hours.

Remember, system may not run if you don’t have CMOS battery or CMOS battery is low for some AMD cpu mainboard.

I wrote this just help people who interest in repair mainboard have idea how to check the problems on mainboard."

About Motherboard

Motherboard
A stiff sheet of plastic that provides a sturdy platform that contains the central processing unit (CPU), memory, various additional slots, and circuitry that comprise a computer system.
On a motherboard, the Northbridge is a chip that forms an interface between the _____, the main memory, and other components.
CPU
Southbridge
On a motherboard, this is the chip that controls the input and output (I/O) functions; it's directly connected to the Northbridge.
Read-only memory (ROM)
A chip, also called the BIOS, that contains the firmware, or startup instructions for a computer system.
These are the most common types of connections on the motherboard.
Integrated Drive Electronics (IDE) and Serial Advanced Technology Attachment (SATA).
Schematic Diagram
A logical organization of how computer components are connected, instead of where they are physically found on the motherboard.
It's important to remember that motherboard technology can _____ very quickly.
change
{Blank} use a schematic diagram as a way to think about a computer motherboard.
Computer engineers

Flashcard Content Overview

This flashcard set covers information on the central processing unit (CPU), also known as the brains of the computer. Featured cards include definition-based cards on various computer components, such as the arithmetic logic unit (ALU), control unit and cache, using multiple processors to increase performance (duo-core and quad-core) and how to transfer the stream of electricity passing through the processor by using transistors.

Ferranti Mark 1, the world's first commercially available general

Early electronic computers such as Colossus made use of punched tape, a long strip of paper on which data was represented by a series of holes, a technology now obsolete.^[15] Electronic data storage, which is used in modern computers, dates from World War II, when a form of delay line memory was developed to remove the clutter from radar signals, the first practical application of which was the mercury delay line.^[16]The first random-access digital storage device was the Williams tube, based on a standard cathode ray tube,^[17] but the information stored in it and delay line memory was volatile in that it had to be continuously refreshed, and thus was lost once power was removed. The earliest form of non-volatile computer storage was the magnetic drum, invented in 1932^[18] and used in the Ferranti Mark 1, the world's first commercially available general-purpose electronic computer.^[19]

IBM introduced the first hard disk drive in 1956, as a component of their 305 RAMAC computer system.^[20] Most digital data today is still stored magnetically on hard disks, or optically on media such as CD-ROMs.^[21] Until 2002 most information was stored on analog devices, but that year digital storage capacity exceeded analog for the first time. As of 2007 almost 94% of the data stored worldwide was held digitally:^[22] 52% on hard disks, 28% on optical devices and 11% on digital magnetic tape. It has been estimated that the worldwide capacity to store information on electronic devices grew from less than 3 exabytes in 1986 to 295 exabytes in 2007,^[23] doubling roughly every 3 years.^[24]

German messages was the first electronic digital computer.

Devices have been used to aid computation for thousands of years, probably initially in the form of a tally stick.^[8] The Antikythera mechanism, dating from about the beginning of the first century BC, is generally considered to be the earliest known mechanical analog computer, and the earliest known geared mechanism.^[9] Comparable geared devices did not emerge in Europe until the 16th century,^[10] and it was not until 1645 that the first mechanical calculator capable of performing the four basic arithmetical operations was developed.^[11]

Electronic computers, using either relays or valves, began to appear in the early 1940s. The electromechanical Zuse Z3, completed in 1941, was the world's first programmable computer, and by modern standards one of the first machines that could be considered a complete computing machine. Colossus, developed during the Second World War to decrypt German messages was the first electronic digital computer. Although it was programmable, it was not general-purpose, being designed to perform only a single task. It also lacked the ability to store its program in memory; programming was carried out using plugs and switches to alter the internal wiring.^[12] The first recognisably modern electronic digital stored-program computer was the Manchester Small-Scale Experimental Machine (SSEM), which ran its first program on 21 June 1948.^[13]

The development of transistors in the late 1940s at Bell Laboratories allowed a new generation of computers to be designed with greatly reduced power consumption. The first commercially available stored-program computer, the Ferranti Mark I, contained 4050 valves and had a power consumption of 25 kilowatts. By comparison the first transistorised computer, developed at the University of Manchester and operational by November 1953, consumed only 150 watts in its final version.^[14]