I have been told my hv splitter is bad. i have read things on the internet that usually when the hv splitter goes bad, the R721U is fried as well. the problem the tv is having is when you hit the power button on the tv, it makes an arching noise. any suggestions?
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set is prone to two problems: high voltage splitter at front of set behind speaker grill arcs-------also set does have parts on HV board that do the same thing---HV transformer feeds voltage to the splitter.
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
If you are talking about the HV splitter in the front of the set----remove the front grill(screws behind set on either side) and then the inspection plate behind it----the splitter will have a red wire coming from the HV transformer and 3 more red wires going to each of the picture tubes--If the splitter is bad remove the wire from the high voltage transformer that goes into it(it should pull out and if may be hard to get it out) with it out and not touching anything (isolate it well clear of anything) the set should then come on and you should hear a hiss from the wire you removed---if the set stays on shut it off quickly and replace the block---most of them are available on the internet at a reasonable cost. hope this was helpful.
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.
HV splitter and flyback are common failure items. Remove the HV lead from the HV splitter that comes from the flyback, Place that into a dry glass jar secured so it doesnt come out. Then try powering up the set if the set powers up without shutting down the splitter is bad.
On the 205064 hv splitter with the splitter mounted in the set,left to right, hv transformer,red tube,green tube,blue tube,plug on right side goes to screen asy,the black wires plug on the left side of splitter,which are grounds.
had a 51" rca rear projection donated to myself. While off and power button pressed there was a clicking noise from the front of the unit. Rear cover was removed and it could be observed that the hv splitter had a crack in the casing and the power was arcing out of the splitter.
I purchased a $72 dollar hv splitter, i read that the $20-$30 dollar one would break within a year, and the unit powered up no problems.