SMPS

SMPS delivers power supply to computer components. Since constant power supply is not possible all time slight deviation accepted. This can be tested using Multimeter.

WireColor	Value
Black	Ground
Red	+5V
Grey	Power OK
Purple	+5V
Yellow	+12V
Blue	-12V
Green	+5V PS-ON
White	-5V

MOTHER BOARD

Mother Board is the PCB (Printed Circuit Board) which is the nervous system of a computer. It contains the connections for all the peripheral components. Motherboard comes with capacitors and resistors with regulate the power supplied to sensitive components. The major components are mother board are Mouse, Keyboard, USB, Parallel Port, CPU chip, RAM slots, Floppy controller, IDE Controller, PCI Slot, ISA slot, CMOS Battery, AGP Slot, CPU Slot, Power supply, Plugins

TYPES OF MOTHER BOARD (Based on CPU Sockets)

1. PGA (PIN grid Array) – Pins will be in processor.
2. ZIF (Zero Insertion Force) or (LAN Grid Array) – Pins will be in mother board.

Block Diagram of Mother Board

TYPES OF MOTHER BOARD (Based on Form Factor)

1. CPx, MCPx, NCx
2. XT
3. AT
4. ATX
5. MATM
6. MITx

XT Classification

·         Size of board 216 * 279

·         8 bit data transfer rate (16 bit also)

·         Implemented on IBM 1983

·         5 ping Din connector for keyboard and mouse

·         ISA Industrial Standard Architecture

·         SIMM singe inline memory module

·         12 Pin power connector

·         Magneto-optical disc (Floppy)

·         Processor co-processor

AT Classification

·         Size of board 330 * 305

·         32 bit data transfer rate (16 bit also)

·         USB 1.0  (1.5 Mbps), USB 1.1 (12 Mbps)

·         PCI (Peripheral component interface)

·         AMR (Audio Modem Raiser)

·         Rear and front panel connection

·         16/20 pin power connector

·         PGA processor (Pin grid array)

·         DIMM Slots dual inline memory module for SD and DDR family

·         North Bridge and South bridge, CMOS, BIOS, PS2, Parallel, Serial, Sound Jack, and NIC.

ATx Classification

·         Size of board 305 * 224

·         64 bit data transfer rate (32 bit also)

·         USB 2.0 (480 Mbps).

·         24 Pin power connector

·         LGA (Land Grid Array) processor

·         Dimm Socket

·         PCI

MATX Classification

·         Size of board 224 * 224

·         64 bit data transfer rate (32 bit also)

·         USB 3.0 (480 Mbps).

·         24 pin power connector

·         LGA (Land Grid Array) processor

·         Dimm Socket

·         Express PCI

XT Classification

WTX - 356*425

AT – 350*305

BAT – 330*216

BTX – 325*266

ATX – 305*244

LATX – 305*330

LPX – 330*229

Micro BTX – 264*267

NLX – 254*228

UITX ATX – 244*387

MATX – 244*244

MINI ATX – 150*150

FLEX ATX – 229*191

MOBILE ATX – 60*60

Popular Motherboard Manufacturers:

ASUS, AOpen, Intel, ABIT, MSI, Gigabyte, Biostar