The Workbench

Re: LX5500 focus

david707 — Tue, 03 Mar 2009 07:41:38 GMT

Thankyou very much both. I am pleased to hear that it is probably not the tube! A question of repair or replacement of the boards? There will no doubt be plenty of parts available from salvaged sets. The video board has been replaced.

I have a 4500 that is much sharper and I would like the 5500 to be as good

Re: LX5500 focus

Die_Bogener — Tue, 03 Mar 2009 06:55:11 GMT

This happens when the highvoltage begins to change due to wear and tear...

The tube is probably not the problem, this type of philips tube is one of the very best tubes ever produced. It's very resistent and durable.

You should begin to replace the caps of the mainboard. Since the mainboard is still working, it's really not a big deal to replace around 20 caps. Then most of the parameters of the tube are in spec again.

Re: LX5500 focus

nobby — Tue, 03 Mar 2009 06:52:39 GMT

Its possible that the focus unit is not in its prime ... you could try scaveging another and see how it performs.

Neil

LX5500 focus

david707 — Tue, 03 Mar 2009 05:33:00 GMT

My LX is not as sharp as it could be and varies a little as the TV warms up. I have adjusted the focus control on the tube neck thanks to the excellent thread by Die Bogener but this control is now at its maximum level. Does this mean the tube is on its way out? I also have an orange mark showing up at the bottom right of the screen when there is red in the TV picture.

Thanks for any help.

David