Not a TV repaiorman either but from the scopes I've worked on I'd guess the color amp is out.
>the rgb board is most likely bad.  It is highly unlikely all three bulbs blew at the same time.  Not a repairman so take it at what its worth.
>
>>Hello,
>>    
>>     I have just acquired a 52" Magnavox Big Screen TV.   One problem though:  there's no color in the picture.   The TV is about 10 years old, and the color left the picture recently.
>>     Any idea what the problem may be?   I'm not sure how the color works on these TV's.   Is there a seperate picture tube for each color (RBG)?   Is this a common problem with a common solution?   
>>     Thanks for your help!
>>
>>-Brandon
>>
    
    Re:Question for all you TV Repairmen!
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