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does not power on, no picture, No power to my TV, remote control, schematic

Goodmans 336 NS

posted by Noggin on Mar 09, 2007

after a probable subwoofer too close incident (also possible cause - power spikes and low voltages are common here, but none particularly memorable when the fault occurred)my neighbour gave me a goodmans 336 NS which was basically showing all pink and a bit fuzzy. I have tried to degauss it by all the normal methods with mixed results - i have managed to get it to be blue or green instead of pink but never all at the same time. the effect is over the whole screen. inside the box is clean and there is no obvious burnt component - please let me know if there is something that i am missing.

in particular is there a self de-gausser on the set? i cannot find it in any of the menus or anywhere on the remote or controls.

Thanks in advance
:)

Comment by Noggin, posted on Mar 21, 2007

Thanks Pr. But only any help if u have a source for schematics - I have tried and had no joy.

:)

ps i think the diffuser is part of the main board - please let me know if u think not?

Next question is, if it is the diffuser or main board - any idea where i can get one? I haven't checked board numbers myself yet, but probably will soon, but if you have a goodmans spares site i'd be very interested.

Thanks,

Comment by Noggin, posted on Mar 22, 2007

thanks - oh well - at least i didn't pay for it.

:)

Comment by Noggin, posted on Apr 28, 2007

Thanks Bogdan - soldering iron was first thing i tried - techman reckons a proper coil is worth trying - will get one soon

:)

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Best Solution

posted on Mar 21, 2007

profane

Rank:

Guru
Rating: 87%, 152 votes

it might be a defusion board which is what spits up the picture

Comment by profane, posted on Mar 21, 2007

The shadow mask has probably been buckled on the picture tube so to be honest the repair is not cost effective after consulting with another tv tech this is the answer i got. hope it helps

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Solution #2

posted on Apr 27, 2007

Bogdan

Rank:

Guru
Rating: 90%, 389 votes

Hello Noggin,

The degauss method involving soldering iron (the ones that use a transformer) is the best and effective as I know. Simply close the solder iron at one side with the transformer close to the screen, press power and move it around the screen. This should be done with the tv dissconected from power. Have you tried it, and with what result?
Also from what I know older type of tv's have degauss coils, but they are only powered when the tv is reconnected to the mains, only when it is powered then. Durring normal operation and stand-by - on cicles, they don't appear to work. I'm not the tv specialist here, but hope this helps.

Good luck

Comment by Bogdan, posted on Apr 28, 2007

I haven't seen cases of a whole screen to become equally magnetised. Most often the edges come magnetised and due to more powerfull exposure all screen but not equally. Have you checked the filament voltage for the cathodic tube? It should be 6.3V but on some models it can be about 7 volts resulting in premature aging for the tube and lack of sharpness or color problems. I know of some devices on the marked that "revives" the tube at some level, maybe they will improve your colors.

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