Wednesday, 26 July 2017

Elektro at the World's Fair

Built by Westinghouse, the relay-based Elektro robot responds to the rhythm of voice commands and delivers wisecracks pre-recorded on 78 rpm records. It appeared at the World's Fair, and it could move its head and arms… and even "smoked" cigarettes.

Computers

David Packard and Bill Hewlett found their company in a Palo Alto, California garage. Their first product, the HP 200A Audio Oscillator, rapidly became a popular piece of test equipment for engineers.

How to Use OneDrive (Viewing File Options) Part 3

Click the circle in the top-right corner of a file or folder. Doing so will select it.

On mobile, tap and hold a file or folder.

How to Use OneDrive (Uploading Files) Part 2

Open a folder if necessary. You can upload files directly to the "Files" page, but if you want to organize your files, first double-click or tap a folder to open it.

How to Use OneDrive(Navigating OneDrive) Part 1

Open OneDrive.

On desktop, open your web browser and go to https://www.onedrive.com/
On mobile, tap the OneDrive app. It resembles either two white clouds on a blue background (iPhone) or two blue clouds (Android).

Backup your data. When you format a computer, you will lose all of your files and data. The programs can’t be backed up; they will need to be reinstalled. Any files—including documents, music, pictures, and videos—that you want to save need to be copied to a backup location.

Formatting a computer involves erasing all of the data on the computer's hard drive, and then reinstalling the operating system so that the computer is restored to factory defaults. This can be useful if your computer is malfunctioning, or you are planning on selling or donating it. Follow this guide to format your Windows 7 or Mac OS X computer.

Pre-20th century

The Ishango bone

Devices have been used to aid computation for thousands of years, mostly using one-to-one correspondence with fingers. The earliest counting device was probably a form of tally stick. Later record keeping aids throughout the Fertile Crescent included calculi (clay spheres, cones, etc.) which represented counts of items, probably livestock or grains, sealed in hollow unbaked clay containers.The use of counting rods is one example.

If you are looking for Acer laptop service manuals, here they are.

I found these manuals published on one of the Russian sites.

Introduction

This guide will show you how to safely remove your laptop battery without damaging the laptop or battery.

Introduction

This guide will show you how to replace the Hard Drive for your Alienware 17 R3 laptop. Ensure you have all the necessary tools before starting.

Computer is freezing or not running well

Computers may freeze on account of any hardware or software issue, so here you need to understand the exact reason behind it. Notice if the issue started when you connected any hardware peripherals like a printer or scanner; then it might be due to a driver conflict. If the issue occurred after installing a new hard drive, then it might be due to insufficient power or too much heat. Follow the troubleshooting pattern below to repair your computer, if such problems occur.

Diagnostics

Many computers now come with built-in diagnostics which can tell you if you have certain issues. Two brands of computer that normally have diagnostic options are HP/Compaq and Dell. To access these diagnostic options:

“My Toshiba laptop suddenly shuts down by itself without any warning. Sometimes it works fine for hours, sometimes it shuts down in 10-15 minutes.” This complaint we hear from our customers over and over again. About 15-20% of all Toshiba laptops we get for repair, suffer from an overheating problem. Yep, OVERHEATING!

If you are looking for Acer laptop service manuals, here they are.

I found these manuals published on one of the Russian sites.

A bad connection between DC-IN power jack on the system board and the system board is a very common problem with Toshiba Satellite M35X and Toshiba Satellite A70/A75 notebooks. If your laptop is out of warranty, then you can fix the problem by resoldering DC-IN jack on the system board. If it’s still under warranty, it would be fixed at no charge to you.

How to remove BIOS password from Toshiba

You can use this plug to remove or clear the BIOS password from older Toshiba laptops. I tested the plug and it successfully cleared the BIOS password from Toshiba Satellite 1415, Satellite 1800 and Satellite Pro 6100.

To connect a laptop hard drive to a desktop computer you have to use a Laptop IDE Hard Drive Adapter. You can easily find this adapter on the Internet for $10-$15. This adapter is very handy if you want to scan a laptop hard drive for viruses and spyware using antivirus software installed on a desktop PC, transfer data from a laptop hard drive to a desktop computer or create a ghost image from one hard drive to another. I also use this adapter if a laptop hard drive has failed and I have to recover data from it.

Here are some tips and tricks for troubleshooting and fixing laptop video problems. Video issues are very common within portable computers and with the following tips you should be able to detect and eliminate basic laptop video problems.

One day you turn on your computer and cannot see the CD-ROM or the DVD-ROM drive in the My Computer window anymore. This problem is very common for laptop and notebook computers and might be caused by a failed drive or by corrupted software. You can try the following repair steps before you decide that your drive is bad.

If you own a Toshiba Satellite M35X, A70 or A75 laptop then you can experience the following problem. You laptop might lock up, freeze up or even reboot by itself when you touch the palm rest around the speakers area. It happens because of a static electricity discharge when your touch the laptop speakers.

The laptop failure symptoms:

The laptop will not turn on when I try to start it from the battery. When the laptop is turned off and plugged into the AC outlet the battery charge LED doesn’t light up. I know that the battery is not charged and the LED should light up when I plug the laptop into the AC outlet. The laptop starts fine when it is plugged. When I move the mouse over the Toshiba Power Icon in the lower right corner, the balloon will pop up and there is a line in there: Battery Remaining: N/A.

“Laptop shuts down on power up. When the power button is pushed, the laptop flashes green lights for several seconds and then powers down. Unit will not stay on with battery or when plugged in”.

Display assembly diagram

Here is a simple diagram that will help you to understand how a notebook display assembly works and how an image appears on the screen. I’m not an artist and I tried my best drawing this diagram, so if you cannot see a laptop in this picture, don’t be mad.

Fixing bad video on LCD screen

Here I’m going to post some laptop screen photos showing bad video output. I’ll explain what was wrong with the screen and how I fixed it. I plan to ad more examples as soon as I get new pictures. If you have your own example (and know how to fix it) please let me know and I’ll post it too.

HMM will provide you instructions for troubleshooting, diagnostics, removal and replacement laptop hardware. All IBM HMMs are publicly available. You can find HMM for your laptop on the IBM website or you can follow the link below. All HMMs are in pdf format, so you can download them and use at your convenience. For hardware replacement instructions find “Removing and replacing a FRU” chapter.

A few days ago I had to repair a notebook with symptoms that didn’t look like a hard drive failure at all. But the problem was fixed after I replace the hard drive.

It was Toshiba satellite A70-S249 notebook with the following problem. when i press on the power button, the laptop starts up as usual and a red Toshiba logo appears on the screen.

Do you have a problem with the backlight on your laptop? If yes, you are not alone, that’s one of the most common laptop problems. In most cases the screen inverter is the culprit. Here are some LCD screen backlight failure symptoms that could be related to a bad inverter board:

– Laptop boots as usual but after some time the screen blacks out. You still can see an image on the screen but it’s very dim. You might even use a flashlight to see it better. Sometimes the backlight comes back for a while but then goes off again. In some cases you can turn the backlight on if you tap rapidly on the lid close switch.

Yesterday took apart and repaired my notebook LCD screen with water damage. The screen itself was working just fine but it had two different problems.

– previous owner spilled water on the laptop. Somehow the water got inside the LCD screen and left stains inside the screen. The water marks were very noticeable on a white background and it was very irritating.

HP Compaq manuals

Fixing a HP/Compaq laptop yourself? Need some help with taking the laptop apart? Here are links to manuals with step-by-step disassembly instructions. All these manuals are available from the HP website.

One or more keys fell off the laptop keyboard and you are not sure how to put them back? Don’t worry, most likely you can fix the keyboard and it’s not necessary to buy a new one. There is no universal repair guide because all keyboards are different. Here’s what I usually do in this case.

If for some reason your notebook fails to boot and you need to access data on the hard drive (I assume there is nothing wrong with the hard drive itself), you can use an external USB enclosure. This method is very simple and could be very useful when you need an emergency access to your data on the hard drive.

Let’s talk about problems typical for Toshiba Satellite A60 and A65 notebooks. Do you own one of these laptops? Is it working fine for you?

Here are some typical issues I’ve notices with this model.

Laptop does not start. Fixing the problem.

If your laptop does not start at all or it starts but will not boot properly, it’s possible that you can fix the laptop at home without taking it to a repair center. Here are some troubleshooting tips for you. I’m not sure if I can cover all situation at once, so I will update this post as more examples come into my mind.

Toshiba Satellite M35X model is known for it’s power connector problem. This issue has been covered on this blog a few times before in the following articles.

Toshiba Satellite M35X and Satellite A75 power jack and battery charge problem

These instructions will help you to remove and replace keyboards on various laptops. I will not be able to cover all models but you’ll get the idea. Steps for removing and replacing the keyboard are similar for most laptops.

If your keyboard is missing a key, it’s not necessary to replace the whole keyboard. You can fix it using this guide: how to fix keys on a laptop keyboard.

Troubleshooting backlight failure

Here are my steps for troubleshooting this laptop with the backlight failure.

First of all, I tested this laptop with an external monitor connected to the VGA port and the external monitor worked absolutely fine. I was able to get crystal clear image on the external screen even though the internal screen didn’t light up. If the external screen works fine, then most likely there is nothing wrong with the video card.

DC power jack repair guide

This guide will explain how to repair a failed or loose DC power jack on a laptop computer yourself.

Disclaimer: I’ve made these instructions only for people experienced with soldering and repairing computers. If you don’t feel comfortable doing this job, please do not open the laptop or you can permanently damage your computer. Take your laptop to a professional repair shop instead. Use this repair guide at your own risk.

How to replace backlight lamp (CCFL)

In this guide I will disassemble a laptop LCD screen in order to remove and replace the backlight lamp (CCFL).
Replacing the backlight lamp is not an easy task even for experienced technicians. If you do something wrong you will permanently damage the LCD screen and have to buy a new one. Proceed on your own risk and do not blame me.

How I fixed memory slot failure

Is it possible to fix laptop memory slot failure with a guitar pick? Yes, it is. You will not fix the memory slot itself, but you can work around the problem.
Today I received a Toshiba Satellite Pro 4600 laptop with the following complaint:

Installing internal wireless card

This tutorial explains how you can install internal wireless card into an older laptop. I assume that your laptop is “wireless ready” which means it has a slot for the wireless card and equipped with wireless antennas, but missing the wireless card. Why did I make this tutorial for an older laptop? Because all new laptops are sold with the wireless card.

What can you do if the laptop LCD screen turned completely white? From my experience I can tell that this problem may be related to the following:

1. Loose connection between the video cable and the LCD screen.
2. Defective LCD screen.
3. Defective motherboard (I assume the graphics card is integrated into the motherboard).

In this post I’ll explain how to troubleshoot a dead laptop and find the problem. The following troubleshooting tips are not model and brand specific.

Let’s take a look at different failure scenarios.

Battery not charging if connector moved

This laptop has a power problem. The battery stops charging when I move the AC adapter connector inside the jack. When the connector or power cord moved, the battery charge LED light on the front goes on and off.

Let’s troubleshoot this problem and figure out if this is DC jack related failure or the AC adapter is defective.

New screen installed but not working

If you installed a new screen into the laptop and for some reason it doesn’t work, there may be a few things you could have done wrong.

Lets figure out step-by-step how to troubleshoot and and fix the problem.

First of all, I assume that your new LCD is compatible with the original one. If the screen looks identical, it doesn’t exactly mean it’s compatible. Double check the compatibility between the original and new LCDs.

Installing USB Bluetooth adapter inside

Here’s how I installed an external USB Bluetooth adapter inside my laptop case.

My old computer wasn’t Bluetooth ready, it didn’t have the internal connector and antenna for it. I decided to modify my USB dongle and move it inside the case.

How to modify damaged DC jack

In this guide I explain how to modify damaged DC jack. While replacing the DC jack a few days ago I accidentally damaged one of the thermals on the motherboard.

How to test screen inverter

In this post I explain how I test the inverter board in a laptop.

The inverter failure is very similar to the backlight lamp failure. In both cases the screen gets very dark and the image becomes very faint, barely visible under a bright light.

How to fix hardware problems

In this guide I show how to work around some common laptop hardware problems without taking it apart.

How to fix broken keyboard connector

In this guide I explains how to fix a broken keyboard connector on a laptop motherboard.

The connector is a very delicate mechanism. It’s very easy to get it damaged if you apply too much force while trying to unlock it.

Follow the link to buy your accessories

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Follow the link to buy your accessories

ENIAC - First Computer in the Unites States

ENIAC, an acronym for Electronic Numerical Integrator And Computer is considered to be the first operational electronic digital computer in the United States, developed by Army Ordnance to compute World War II ballistic firing tables. The first all-electric computing machine was proposed by physicist John Mauchly in 1942 and was completed in 1945.

Five Generations of Computers

Learn about each of the five generations of computers and major technology developments that have led to the current devices that we use today.

The history of computer development is often in reference to the different generations of computing devices. Each of the five generations of computers is characterized by a major technological development that fundamentally changed the way computers operate. Most major developments resulted in increasingly smaller, cheaper and more powerful and efficient computing devices.

COMPUTER

A computer is a programmable machine. The two principal characteristics of a computer are: It responds to a specific set of instructions in a well-defined manner and it can execute a prerecorded list of instructions (a program).

Modern Computers Defined

Modern computers are electronic and digital. The actual machinery — wires, transistors, and circuits — is called hardware; the instructions and data are called software.

Fixing Compaq motherboard video

Here’s how I fixed a Compaq Presario V6000 laptop motherboard with “no video” issue.

Also, this fix might work for the following HP/Compaq motherboards: HP Pavilion dv2000/dv6000/dv9000, Compaq Presario V3000 and probably some other models.

Battery charging problems

In this post I explain how to troubleshoot battery charging problems. I will discuss most common failure examples and suggest some troubleshooting steps.

How to fix HP video problem

Today I show how to fix a known video problem on some HP laptops using bubble wrap.

Most likely the fix is not permanent but this will buy you some time, enough to backup personal files or even use the laptop until you get a new one.

Why laptop turns off or freezes?

My computer runs very hot and eventually turns off or freezes – this is one of the most common complaints I have been receiving from my customer for many years.

Why it’s happening? Is there an easy fix for that?

HOW TO CLEAN UP LIQUID DAMAGE

Wipe it out liquid with a soft cloth. Ideally, use an air compressor to dry the motherboard.

Be very careful wiping the motherboard because it has too many small components.

Liquid spill repair tips

In this post I provide a few liquid spill repair tips.

IMPORTANT: If you spilled something on your laptop you should stop using it right away, even if it appears to be running good. Right after the spill you should turn it off, unplug the power adapter and remove the battery. The laptop should be disassembled as soon as possible and all internal parts should be inspected for liquid damage.

Liquid spills are very unpredictable. Even a small liquid spill can cause serious damage.

How to reinstall factory OS

In this post I explain how to reinstall factory operating system. This should work for most laptops running Windows Vista or Windows 7 OS.

This could be useful if your OS stopped working properly, got corrupted or infected with a virus.

Interface

An I/O interface is required whenever the I/O device is driven by the processor. Typically a CPU communicates with devices via a bus.

Computer and accessories sale

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Creator

Wednesday, 26 July 2017

Built by Westinghouse, the relay-based Elektro robot responds to the rhythm of voice commands and delivers wisecracks pre-recorded on 78 rpm records. It appeared at the World's Fair, and it could move its head and arms… and even "smoked" cigarettes.

Computers

Wednesday, 19 July 2017

Tuesday, 18 July 2017

Pre-20th century

Introduction

Introduction

Monday, 17 July 2017

Sunday, 16 July 2017

Saturday, 15 July 2017

Friday, 14 July 2017

ENIAC - First Computer in the Unites States

Thursday, 13 July 2017

Learn about each of the five generations of computers and major technology developments that have led to the current devices that we use today.

Modern Computers Defined

Wednesday, 12 July 2017

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