Motherboard Wire Connections

A typical desktop computer's motherboard has two types of fan connectors: a fourpin connector for the processor (CPU) fan and one or more threepin connectors for system fans (fans mounted on the front, top, or rear of the case). Figure 16.4 illustrates how these connections look before and after fans are connected to them. The CPU fan connector (front) has a ground wire, a +12V DC power wire, a fan speed (also known as fan tachometer) wire, and a fan control wire (controls fan A port is a socket or a slot on the motherboard or on any of its expansion card where a peripheral device can be connected to it. As the design of the motherboard is changing over a period of time, the number of ports and types of ports are also changing on

it..A connector is a wire connection between the motherboard and the other devices that are within the CPU cabinet. A list of some of the connectors that are available on the motherboard is given below: • Connector to LED of hard 2 Notes Positive wires connecting the front panel to the motherboard are usually a solid color, and negative wires are usually white or striped. To help orient the connector on the motherboard pins, look for a small triangle embedded on the connector that marks one of the outside wires as pin 1 (see Figure 230). Look for pin 1 to be labeled on the motherboard as a small 1 embedded to either the right or the left of the group of pins. If the labels on the board are not clear, turn to the There might

also.be an audio wire from the CD drive to the motherboard. Disconnect it from the You will want to be certain that you don't switch these two lines when reconnecting them, because this would cause the wrong voltage to flow in the circuits on the motherboard and could destroy the board. Fortunately, most connections today only allow you to place the lines in the correct order, which is always black leads on P8 next to black leads on P9. For these older boards, LAMINATED STRIP AN ADVANCED SYSTEM OF INSULATED CONNECTIONS IRWIN. Figure 8. Section of Motherboard (Wire Wrap Side) Figure l Example of a simple flex application. angles without damage to the connector card guide. It should be noted that the high contact forces required

for.reliable operation with the solder plated contact fingers result in relatively high insertion/extraction forces necessitating the use of tools. (The high density 0.250" centers helps force the use of Wires, Wires, Wires The last, and often the most frustrating, part of motherboard installation is connecting the LEDs and buttons on the front of the box. These usually include the following: • Soft power • Reset button • Speaker • Hard drive activity LED • Power LED These wires have specific pin connections to the motherboard. Although you can refer to the motherboard book for their location, usually a quick inspection of the motherboard will suffice for an experienced tech (Figure 6.19).This book shows how to repair

and.upgrade all of your PC's essential components: Motherboard, CPU, and Memory.Thunderbolt These wires have specific pin connections to the motherboard. Although you can refer to the motherboard book for their location, usually a quick inspection of the motherboard will suffice for an experienced tech (see Figure 7.45). You need to follow a few rules when installing these wires. First, the lights are LEDs, not light bulbs; they have a positive side and a negative side. If they don't work one way, turn the connector around and try the other. Second, when in doubt, Step 10 Most modern systems have a set of small wire and cable runs connecting front panel indicator lights—primarily the poweron and hard drive activity light

emitting.diodes (LEDs)— and front panel Universal Serial Bus (USB) ports to the motherboard (see Figure 14). Look for these individual wire connections (often collectively called case wires), which are usually grouped together near one corner of the motherboard. Make careful note of where each tiny connector plugs in—a Second, installing these components first prevents the phenomenon of flexing the motherboard. Some cases don't provide quite enough support for the motherboard, and pushing in RAM can make the board bend. Third, attaching a CPllfan can be a bear of a task, one that's considerably easier to do on a table top than within the confines of a case. ' Figure 8.48 Standout in a case, ready forthe motherboard

These.wires have specific pin connections to the motherboard. Although you 

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