What is EEPROM ?

EEPROM stands for Electrical Erasable Programmable Read Only Memory and also referred to as E²PROM. As the name suggest, an EEPROM can be both erased and programmed with electrical pulses. Since it can be both electrically written into and electrically erased, the EEPROM can be rapidly programmed and erased in circuit for reprogramming without removing them from the circuit board.

EEPROM is also called a non-volatile memory because when power is turned off the stored data in the EEPROM will not be erased or intact. New EEPROM have no data in it and usually have to program with a programmer before it can be use. Information stored in this type of memory can be retained for many years without a steady power supply.

What is the function of EEPROM? EEPROMs are used to store user programmable information such as: -

? VCR programming information
? CD programming information
? Digital satellite receiver control data
? User information on various consumer products

EEPROM in monitor performs two functions:

? When a monitor is switch on it will copies all data or information from the EEPROM to the microprocessor. For example, the EEPROM will let the microprocessor know the frequencies at which the monitor is going to operate.

? The EEPROM is used to store the current settings of the monitor. The settings of the monitor will not be erased even when the monitor is turned off. Anytime a change is made in the monitor settings, the microprocessor updates the setting in the EEPROM. When the monitor is turn on again, the stored settings are used to set up the monitor for operation.

What are the symptoms if the MONITOR or TV's EEPROM data is corrupted or damaged?

? No high voltage (no display).

? Horizontal or vertical frequencies run.

? Cannot save (store) current setting.

? Certain control functions like sound, brightness and contrast control does not functioning.

? On Screen Display (OSD) does not function or the OSD have a corrupted display.

? High voltage shut down (EEPROM set the horizontal frequency way too low or twice the line frequency perhaps leading to failure of the horizontal output transistor (HOT)).

What is an EEPROM programmer or copier?

EEPROM seldom fail, they just lose or have their memory (data) corrupted may be due to high voltage and static discharge from a monitor. Once reprogrammed they are as good as new. As mentioned earlier, new EEPROMs are blank and need information or data to be loaded in order for it to functions. The job of copying the data into an EEPROM is done by a programmer or a copier. Programmers comes in all shapes and sizes. You can copy these devices for repair replacement only. You cannot copy them for resale without a letter of approved from the vendor who produced them. There is quite a number of companies selling EEPROM programmer:

Typical EEPROM part no:
24C02, 24C04, 24C08 etc
24C325, 24C645AT17C65, AT17C128 etc
93C06, 93C46, 93C56, 93C66 etc
25010, 25020, 25040 etc

Jestine Yong is a electronic repairer and writer. For more information about electronic repair please visit his website at http://www.noahtec.com

In The News:


pen paper and inkwell


cat break through


Used Laptop Computer: Your Quick Purchase Inspection Guide ? Part 1

Used laptop computers are everywhere these days. How can you... Read More

Three Must Have Accessories For Notebook Computers

An Optical MouseNotebooks are normally equipped with touch pads which... Read More

What is EEPROM ?

EEPROM stands for Electrical Erasable Programmable Read Only Memory and... Read More

Rackmount Computer Keyboards

The other piece of vital equipment to accompany the rack... Read More

Computer Parts Online

In today's age, building computers on yourself is often chosen... Read More

DVD Recorders: Getting Started

IMO, these sd work 'like a VCR' as far as... Read More

An Inexpensive Solution to Securing Public Access Computers

Offering secure public Internet access is not as easy as... Read More

A Short Introduction to Blu Ray

Blu ray is a next generation optical media format developed... Read More

What is ESR Meter?

All capacitors have a certain amount of resistance to the... Read More

What Everybody Should Know About An Inkjet Printer: The One-Year Cost Of Printing

You can purchase an inkjet printer for as little as... Read More

Hard Drive Selection

Perhaps the biggest mistake people make when building their computer(s)... Read More

Facing DVD Software Dilemma? Its Brainlessly Simple

The Pocket DVD Wizard allows you to make backup copies... Read More

Your Business versus Mother Nature

Business Consultants earn hundreds of thousands of dollars every year... Read More

A Review of Refurbished Toshiba Laptops

Toshiba offers a few of their refurbished laptops in the... Read More

What Is A Crystal? And How To Test It

Crystal are use to keep the frequency of the clock... Read More

How to Add or Remove an IDE ROM drive

CD ROMS - If you're adding or removing an internal... Read More

Correctional Institution Preventive Maintenance Software

There is a great need for preventive maintenance in correctional... Read More

The Top 10 Must-Have Laptop Accessories

You've laid out good money for your laptop computer, but... Read More

How To Choose The Best Student Laptop?

How To Choose the Best Student Laptop?Merchants are singing those... Read More

How To Buy The Perfect Student Laptop

If you are like most student's, money isn't exactly growing... Read More

SED is Coming

One of the bigger challenges facing display manufacturers is to... Read More

RAID Disk Recovery

RAID is short for Redundant Array of Independent (or Inexpensive)... Read More

What You Should Know Before You Buy Computer Equipment

You will have many factors to consider when deciding on... Read More

Printers: What Really Happens When You Hit ?Print?

You just poured hours upon hours into a lengthy research... Read More

A Review of Brother Laser Toners

Brother is right up there with HP and Samsung as... Read More

How to Read Zener Diode Code

Many technicians are confused on how to really read a... Read More

LCD Vs. CRT

When buying a new computer, or upgrading your monitor, you... Read More

Learn About The Three Basic Types Of Computer Mouse

1) Mechanical: This is a type of computer mouse that... Read More

Adding USB 2.0

The process of adding USB 2.0 ports took no time... Read More

How To Purchase A Quality Laptop Computers Case

So you finally have that new laptop you have been... Read More

Computer Components for Idiots

There are many fancy add-ons for computers, but the basic... Read More

Laptop Security -Where?d My Laptop Go?

Laptops are lovely. They are convenient, mobile, powerful and prestigious.... Read More

Do You Feel Used by Computers?

Do You Feel Used by Computers?A look at second-user computer... Read More