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If the deflection power board was changed with a known good one . then the HV splitter block would be suspect then followed by a bad CRT next. I would try removing one CRT drive board at a time by letting it hang free wires attached then trying to power up the set if it doesnt power up then try one of the other crt drive boards after reattaching the one you previously unhooked. If the set powers up if any certain CRT board is removed you will know the problem is that CRT. If it doesnt power up then its most likely the HV splitter. You can get replacement CRTs, boards and HV splitters that have warranties from www.tvrepairworld.com
Whenever there is a a spark or a flash it generally means high votage(HV) is arching either from the flyback, one of the CRT's or HV splitter/Focus block where the HV is created - It will be easy to diagnose but probably expensive to repair. Parts costs- Flyback and HV block $100-200 and CRT over $300
Failure of the HV splitter was a very common problem when I was doing these big screens on the road. The set won't come on if the splitter shorts. We used to test if that was the cause by pulling the HV input lead out of the splitter (leaving it still inside the plastic cup so it wouldn't arc anywhere) and turning the set on. Most often the set would fire right up (without picture of course).
I believe the RCA part number for the splitter is 205064, and it's available from a number of sources. I'm not home right now so I can't check. If I have the number wrong I'll post a follow-up comment.
I am assuming you need to get the HV lead out to remove the board. That model if I am not mistaken has the one large Red HV lead running from the flyback to the HV splitter where the other 3 large wires run to the CRts. If this is the case the trick is to remove the wire from the flyback at the splitter, I have found its easiest to slide the red rubber boot back then use a pair of pliers with tape on the jaws so as to not hurt the wire then grab the wire as close to the splitter block as possible then using a second pair of pliers like a hammer and hit the pliers holding the HV lead and thst will force the HV cable out of the Splitter block.
YOU HAVE A CRACKED HV SPLITTER--THIS IS NOT A REAL EASY JOB--GO TO YOUR LOCAL TV SERVIC COMPANY --YOU WILL NEED THE MODEL AND CHASSIS #'S ,,THERE IS ALSO A PART # ON THE BLOCK--PRICE SHOULD BE 75.00 OR LESS-GOOD LIUCK!!!!!!!!
From your description ..actually this is a common problem and no simpley replacing the resistor will not fix it. this chasis has a problem with what is called the high voltage splitter.. there was a number of these made with a defective splitter. RCA HAS ISSUED a service bulliteen for certain models and serial numbers. the board and the splitter is generally replaced. (I just worked on one of these 2 days ago and got and order in for the parts) ......just reread the tech bulliteen.. the spitter which develops a crack is rca part number 258512 the resistor or the part that burnt is resistor a common 27k 1/2 watt 10% carbon resistor
The tiny lites you see on the end of the tubes or crts are the filiments. This is a normal thing and if you didnt see those I WOULD BE WORRIED.. Now Who is they ?? who told you all that was wrong with the tv was the HI voltage block?? if your not a tech Dude your traveling into some very ,very dangerous territory!! Do you know I used to know three differant peeps who wanted to fix there own projection tvs BUT they are now all DEAD!!! They all electrocuted themselfs fooling around with the HI voltage circuit same as you did!!! Man You should stop and think what your doing before you treally hurt yourself.. Now for myour problem. How do you know the HI- voltage block was bad??? It wasent if you have the same problem that you started with. You probably have a bad flyback or hi voltage transformer?? Well any who I hope you dont get hurt tinkering with these sets as you can if your not carefull!!! CALL A PRO to assit you. Lifes not worth saving a few bucks for is it?? Good luck