Horizontal waves on old Samsung SyncMaster monitor screen

January 9, 2012 at 07:40:15
Specs: Win xp SP3, pentium 4 3ghz HT
Hi Guys

I'm using the old Samsung syncmaster 570s tft and few month's ago my monitor started to display waves on the screen but the picture is stable(nothing is moving just horizontal waves).

It started when the electrical company mess with the voltage(instead 220v they pump it to 300v). At that time i started my computer for few seconds then i shutdown very quickly after noticing the voltage is not correct. I checked the monitor adapter with my hand and it was very hot but it was still working. After voltage correction i started my system and noticed the monitor adapter got very hot after few minutes of usage so i decided to take it a part and saw two swollen caps. I continued to use for about a week then it started to get worse. I was playing Dragon Age 2 then quickly started to saw horizontal waves which comes from down and go up(image stable no flickering), i checked the monitor adapter and it was super hot and immediately i shutdown the system.

I took the adapter to the repair guy and he fixed it. Came home and connect to the monitor and it works well but still the monitor display horizontal waves(i can see them clear if i use gray background color). In the past i experienced similar problem but i found it was bad vga cable but the same bad VGA cable works well with another monitor.
I borrowed another VGA cable from a friend(works well with other monitor) but still horizontal waves on the screen.

Today i decide to open the monitor and inside there is no visible damage(bad circuit or bad caps). Right now my head is spinning(can't figure out the problem) or may be i should buy a brand new VGA cable?
I tried to connect the monitor with two different systems and received the same results(horizontal waves).
Please help.

You know the real meaning of peace only if you have been through the war.


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#1
January 9, 2012 at 11:50:23
A few years ago, UK was using 240v ac, most of Europe 220v.

It was then decided to change the whole of europe to 230v. 10v ac was not expected to make any difference.

If you were sent 300v over the mains, I would expect problems with other things in the house. In which case sue them.

How do you know you got 300v, was that peak or RMS?

A thank you would be nice, if I have helped.


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#2
January 9, 2012 at 14:01:14
clive_pearce (kuwese please ignore this first aside).
Yeah, the reason we didn't have any trouble in the UK is that nothing was really done except change the spec. We were originally 240V + or - 6%. The figures changed to 230V + 10% -6%. All this has done has widened the spec so that the voltage can fall a bit more than it did before, keeping the maximum pretty well unchanged. Whenever I check my mains voltage it is still at around 240V, just as it was before it changed to 230V. All figures RMS of-course.

kuwese
Yes 300V sounds very high. Did you actually measure this?

Always pop back and let us know the outcome - thanks


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#3
January 9, 2012 at 20:37:57
I saw 300v from automatic voltage regulator.
http://imageshack.us/photo/my-image...

We have another automatic voltage regulator in living room but it did a good job by breaking fuse, this one i have in my room didn't do anything to protect my devices.
This is the company owned by government, they can get away with anything. It lasted 300v for about 5 hours.

You know the real meaning of peace only if you have been through the war.


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#4
January 10, 2012 at 06:51:48
Seems to me it might be worth trying to get some money towards your repairs.

Just curious, where abouts are you? I assumed not US because they are about
100-115V (not sure of exact figure or tolerances without checking with Google).

Always pop back and let us know the outcome - thanks


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#5
January 10, 2012 at 09:34:36
I'm from Tanzania.
As i said i can't sue them because they can get away with anything. The government and leaders starts from the president are buch of crooks.

You know the real meaning of peace only if you have been through the war.


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#6
January 10, 2012 at 13:39:36
Ooops sorry, I missed the bit about the government.

I can't offer anything on monitor fix - not many folk repair them these days. You can't get any useful technical infor about them either. Whatever you'd probably need a scope in order to track the fault down.

Keep watching in case anyone else can help but I suspect it will all go very quiet.

Always pop back and let us know the outcome - thanks


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