I have RCA P46813BL with a similar problem. I have no picture but good sound. I do get the screen to display the menus and the channel number, so I know the projectors are working, but I tried even hooking up a video game to the video input jacks and still get no picture and good sound.
So is this the same case where it could be a bad High Output transister??
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Re: RCA p46813BL with no picture but good sound
The good news is your set has a picture therefore is not an output transistor,the problem your set has is a signal processing problem,no video of any source is being processed,is just a different kind of problem and for that you will need the assistance of a servicer to diagnose,try taping where the cables conect to the tv if the set reacts the loose conection is close to that imput panel but if it does not be safe and call for help.
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If the color are separated then you need a new convergence board, or have it repair. If the controls are not working correctly then the processor could have some garbage in it, do to a small power surge, and you will need to leave the set unplug from the wall for 40Min. and it will reset back to normal.
OK., I know this set very well. It almost never has a convergence problem.
With the set unplugged, remove the back cover--there is a small circuit board mounted ABOVE the main boards--it is about 10 inches wide and 4 inches tall---On the far right side of it are several DIODES---two are much larger then the rest--what usually happens is one of the large diodes is shorted--5 dollar part---the board only has a few plugs and 4 screws that hold it in---easy to remove--check all the diodes(the two large ones first)
If either of the large diodes read like a fuse you FOUND YOUR TROUBLE.
LET me know if you need ANY help or Advice--I am here to help people---I have seen several sets identical to yours with the problem you describe.
That might be the problem, however what I would suggest is that you unplug the TV open the back look for a fuse remove the fuse (if you can, it might be soldered in) and then with an ohmmeter set to 1xR measure the resistance it should be 0 ohms. If it is not then that is the problem. If the meter reads 0 ohms then you will have to put the fuse back in and at this point I would suggest that you either replace the TV or take it to a repair shop.
Try removing the Green CRt PC voard that is on the bottom of the green Picture tube which is the center one. Then replace the fuse and see if your set powers up if it does you need a new gree tube. Just be sure the crt board doesnt touch anything while you try it. then let me know what happened, if you need a tube they arent available new any longer but I have a source for good used picture tubes,
I repaired an RCA same model with a very similar symptom. I found bad connections on the printed circuit board at L411 and L 412 (coils) in the horizontal drive circuit. Give the set a good Fonzie ( Happy Days) smack on the side and see if it comes on. LOL. Bad connections are common with that model. It is probably worth fixing and no, lightning didnt do it.
It is probably the convergence Power supply usually mounted above the main boards below. Most of them use a STK730-010 amp that is usually the problem, if not some used a little FET instead. It seems that PCB is available probably listed as a power supply rather than a convergence bd though