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Coloured Spot from PC on TV


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Hi,

I am setting up a PC with a Dvico Fusion HDTV card and ATI Radion 9200 VGA Card connected to a Phillips 32PW8808 Widescreen.

Normally (without the PC) all is fine even if PC is on. However when I use the PC, not necessarily for watching TV (on th desktop), I get a large Blueish-purple patch in the top left of the display. This is not quite sop evident when watching Tv throught the PC but is still there.

The PC is connected directly to the TV's VGA (HD15) input. I have tried routing the VGA Cable (5 meters) away from my amplifier and power sources.

Any ideas on what is causing this?

Regards,

Ady.

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Datvman,

Thanks for your reply.

I kindof wondered if it was some kind of EMI so that is why I moved it to another location. When I did, the position of the coloured patch didn't move - I would have expected it to if that was the case.

Anyhow, watching TV normally or through the STB does not produce this interference when the PC is ON. If it was the PC directly interfering the CRT, I would have expected it to still happen then!

Also, the PC is currently about 1 meter away from the TV with 2 peices of 18mm MDF and a Yamaha amp between the two. Is this not suffiient? It is not the amp as it has sat next to the TV for a long tiime now with no probs.

Regards,

Adrian.

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try moving the Yammy away from the tvf - the power transformer on those things is huge - it sounds like you do have some sort of magnetic influence happening...

Do you have a centre channel speaker on top of the set?

If it is a magnetic problem then just moving the source away may not now fix it as the tube may have become permanently magnetised. Try a few power on/off cycles (leave 15mins between cycle off/on) to get the tv degauss circuit happening

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Thanks to you all for the replies....

I will try to move things away - yes there is a speaker above the cabinet that the TV is in and the yammy is next to the TV.

However these items remain:

1) The TV has never had a problem with these items - they have always been there.

2) It does not have a problem when being fed by my stb or dvd or watching Tv using it's internal tuner.

Ady.

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Thanks to you all for the replies....

I will try to move things away - yes there is a speaker above the cabinet that the TV is in and the yammy is next to the TV.

However these items remain:

1) The TV has never had a problem with these items - they have always been there.

2) It does not have a problem when being fed by my stb or dvd or watching Tv using it's internal tuner.

Ady.

If the coloured patch is caused by a magnetic field, then moving the equipment that caused the problem may not work to remove the interference.

You may need to degauss the tube.

Usually when you switch the telly on, it will do a degauss automatically.

This is not a very powerful degausser and more severe interference will not be removed by just one "go".

You may need to get a serviceman to do it with a professional degausser.

When I was a teenager, and we got our first colour telly, I discovered the nice patterns I could make waving a speaker magnet in front of the screen.

Imagine my horror when I removed the magnet and the pretty colours stayed there!

My father took the telly in and a degauss made it good as new.

Good luck.

JB

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However these items remain:

1) The TV has never had a problem with these items - they have always been there.

2) It does not have a problem when being fed by my stb or dvd or watching Tv using it's internal tuner.

Ady.

1) The magnetic field can build up slowly over a long time before it's noticable.

2) Yes that *is* wierd and I don't know the reason why - if it is a magnetised shadow mask in th etube then you wouls expect to see it on all inputs...

The only thing I can think of is that you won't *always* see the problem I guess it depends to some extent on the actual picture that is showing and this would be true for any input but maybe it's just more noticable on the PC input.

Have you moved the TV within the room recently? Some big TV's can be influenced by the earths magnetic field -

Whatever - I think the first step is to move the other stuff away from the set , then as John says you might need to have it professionaly2) degaussed.

Good luck - let us know what the outcome is!

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