Tag Archives: repair

This may be why your computer is crashing

I was asked to look at a PC which was misbehaving. Sometimes it worked, but increasingly it was freezing or crashing. Sometimes the hard drive would corrupt and needed Windows repair before it would boot.

I took a look. I ran the drive manufacturer’s diagnostics, which reported no drive errors. I ran memory tests. I removed each of the two RAM sticks alternately to see if one was faulty. I tested the power supply. The PC was still not stable.

Then I took a close look at the motherboard. The only visible sign of possible trouble was that two capacitors close to the RAM sockets were bulging slightly at the top.


I removed the board and replaced the capacitors – not that easy a task, though the actual capacitors are cheap enough. You need a powerful soldering iron and plenty of patience.

Since the replacement though, the PC has been perfectly stable.

Of course the owner had presumed a Windows problem and spent ages updating drivers, looking for viruses, and so on.

The capacitors are branded Tk and since making the repair I discovered that others have similar tales. It is not just these specific capacitors though. The bad capacitor problem remains a common fault with PCs that are a few years old.

The economics of the repair is marginal unless you can do it yourself. A replacement motherboard costs so little that it does not pay for much professional service time. However if like me you get some satisfaction from repairing rather than disposing of old but good electronics, it is worth it.

The other point: if your PC is crashing a lot, take the back off and check the capacitors. Any bulges or leaks, and you can stop wasting time trying to fix a hardware problem by tweaking Windows.

Fixing a laptop screen

When a friend showed me their two-year old Toshiba laptop that had suddenly developed a fault, I was not optimistic. The screen was showing a blur of horizontal lines and you could not even make out the image Windows was trying to show. Likely a faulty screen, but is it an economical repair?

I verified that it was only the screen that was faulty by connecting to an external display, which worked fine. Then I took a closer look at the faulty screen. I noticed that if I pressed the upper left screen trim, it started working. Release the pressure, and the lines reappeared. That seemed to me a good sign.

The last time I tangled with a laptop screen was a few years back. At that time, with the models I looked at, you had to remove the keyboard and numerous other parts to get at the screen; but it seems that it is simpler now. I removed the battery and power, and then unscrewed four screws in the screen trim, following which I could pop off the screen trim by gently prising it away. This enabled me to look at the back of the screen, where the model number was shown. It was a Samsung LCD screen. I figured it would probably be cheaper to search for the Samsung part, rather than finding out what Toshiba would charge for a replacement.

It turns out that a new screen is available for around £75-£85 from sites like this one. Probably worth it for a decent laptop just a couple of years old. The following video, from the same site, shows what is typically involved – though be warned, your particular laptop may be different.

Still, I was wondering if it needed a new screen at all. It might just be a loose connection, since I could fix it with finger pressure. I removed the screen completely by unscrewing it from its bracket, so I could easily get at the VGA connection. I lifted a small piece of tape and removed the connector. Then I reinserted it, pressing it home firmly. Reassembled the screen, replaced the battery and turned on.

Since then, no fault. Who knows, it may recur, but for nothing more than a short time with a screwdriver I am glad to have extended the life of this particular laptop.

PS If you try the above, you do so at your own risk. It is easy to do further damage, so if in doubt consult a specialist.