Monday, February 11, 2013

A blinking nuisance

It's beginning to look as if my shack PC monitor is on the blink. Recently I have noticed that when the system comes back to life after going into standby the picture flashes repeatedly - flash, blank screen, flash, blank screen and so on. Nothing I do seems to bring this cycle to a halt, I just have to wait until the picture eventually stabilizes on its own.

This morning for the first time this occurred upon powering up the system from cold. So it looks as if the problem is getting worse. One day soon I expect the picture may not stabilize at all.

It is a 19 inch (48cm) monitor and must be about 8 years old, bought at a time when 19 inch monitors were quite a pricey item. So I can't complain that I haven't had good use out of it. I must have had three different system units in all that time. I should take this as an opportunity to replace it with a newer, larger screen. Except for the fact that I don't really have the room for a larger monitor as my shack is so small.

I do have a laptop that I could use. It is a nice wide-screen Dell running Windows 7, purchased for work about 3 years ago but now little used as I have given up most of the things I used to do. The trouble with that idea is that the laptop doesn't have the 4 real serial ports and 6 USB ports that the shack PC has, all of which are used.

So I guess I'll be shopping for a new PC monitor some time soon. The thing that always puts me off buying new computer hardware is the fear that it will be RF-noisy and add to the already high noise levels I experience here. This old monitor actually causes some hash on the 2m band, which went unnoticed when it was new as I didn't use VHF at the time. I think I'll ignore cheap Chinese products for once and stick with one of the well-known European brands that have actually passed emissions tests instead of just sporting a CE sticker like I suspect many imports do.


PE4BAS, Bas said...

Hi Julian, I'm thinking of buying 2 24"monitors for the new shack. But am also concerned about the noise level. It would be nice if there were tests about monitors noise levels. CE means Chinese Export by the way. 73, Bas

Roger G3XBM said...

Might be worth doing a Google in case this is a common problem on your display. You might find there are hundreds like it and all were fixed by something like, "replace C23 10uF". I.e. might be a fixable one?

Peter said...

I'm using two LG 23inch IPS panel screens and they seem RF quiet. I also have a 22 inch screen and its power supply causes QRM all over 160 and 80m.

73, Pete (2E0SQL)

Stu M0MMZ said...

PE4BAS: whilst CE being "China Export" is a common misconception, of course CE is supposed to be a mark to ensure that the item meets the conformity of whatever it is supposed to conform to (in electrical items case it would be RF emissions or whatever).

Unfortunately, many chinese exporters put "CE Made in China" logos on everything which implies it conforms. It is actually the duty of the importer to affix the CE logo and ensure it meets regulations.

I hate quoting Wikipedia because it's lazy, but it seems to sum it up rather well.

Julian: Glad to hear you're doing well (I've watched you from afar on a couple of forums). With regards to sticking to the "Well known European brands", you'll find that there are very few manufacturers of screen panels - they are generally made in the same factories. The differentiator is the other components. As you say, stick to the well-known brands, but I'm not entirely convinced it is any sort of guarantee. Buying online might help as you have distance selling rights.

Unknown said...

If you use remote desktop you could access the desktop PC from your laptop. In effect you bring the desktop screen to the laptop.