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Main => Monitor/Video Forum => Topic started by: Hamselv on January 18, 2010, 04:37:58 pm

Title: TV lost red colors
Post by: Hamselv on January 18, 2010, 04:37:58 pm

Hi there,

This isn't strictly arcade related, but my old, trusty 28" CRT TV (PAL) just lost all red colors. It's a 12-year old Prosonic (really cheap European brand, but their old CRTs were actually quite good).

I tried all forms of inputs available (pure antenna signal, Xbox, sat receiver etc.) and the problem remains.

Anyway, I thought that maybe some of the gurus in here could think of a few quick fix solution attempts before I ditch my TV :)   Like: where should I look for shorts or poor connections, which corroded plugs could cause the problem etc... I am open to replacing simple components, but ICs and the like are probably beyond my skills.

Any help is much appreciated, although my hopes aren't that high, hehe...

Title: Re: TV lost red colors
Post by: Kevin Mullins on January 18, 2010, 04:44:24 pm

Open it up and take a good look around the neckboard attached to the tube.

Title: Re: TV lost red colors
Post by: SirPeale on January 18, 2010, 04:52:34 pm

Could be a few things...bad neckboard transistor, back tube, bad video IC...I'd start simple and work your way to complicated.

Title: Re: TV lost red colors
Post by: Hamselv on January 19, 2010, 05:09:22 am

So when the R, G or B transistors are mentioned (in similar threads), this references three transistors on the neckboard (attached to the tube)?

If they are clearly labeled I will try swapping them around and see how the colors respond. Such an operation should be performed with the neckboard removed, right? As I recall (I haven't opened the TV yet) it should be possible to pull out the neckboard from the pins/socket at the narrow end of the tube...

Will it be necessary to discharge the tube? I have done that before, but won't bother/risk it if it isn't necessary  :P

Thanks for the help!