Re: RCA P52937 (PTK195) unusual convergence issue

I figured it out finally, its the eeprom on the convergence board in the rfi box that causes the bowed top and bottom of the screen, 24wc16p, location U19500. Its memory is either corrupted somehow, or the eeprom is getting weak as i can swap it and no matter the board, the same display is rendered from the board the eeprom came from originally.


It anybody knows about eeproms, can i just order a new one and install it and go, or is it mandatory to have the chipper check interface to initialize it for the tv? I...

Re: RCA P52937 (PTK195) unusual convergence issue

Well I feel like an idiot now. I have figured out what causes those spots I had showing on my displays...

For some reason, the convergence memory chip on each board fragged out for a split second, and lost the setting for those particular spots as I was adjusting the convergence, resulting in a birds nest of blue and red lines on the screen concentrated in one spot. I was able to adjust and "straighten" the wavy lines back out with the customer convergence menu.

It took around an hour...

Re: RCA P52937 (PTK195) unusual convergence issue

Well i lost, I got the power supply, and it made no difference, BUT I did manage to fix the pincushion problem (along with bad news about my convergence boards and the one i got off ebay...) It turns out the pincushion problem I had was a bad MUR460 diode and a solder break down from the diode in the pin amp circuit on the main deflection board. I put a new diode in, fixed the solder break and now the screen is square, but I realize now that I have had other issues I didnt know about previously.

I have 3 separate convergence...

Re: RCA P52937 (PTK195) unusual convergence issue

I got the convergence main board a day earlier than expected. It didn't help with the fish-eye effect, but it cleared the odd swirl of color lines i had developed. I am actually thinking my convergence power board is flaky.



I have read alot and researched, and it turns out my ptk195 tv(s, plural since two days ago) both have the newer convergence power supply "that uses discreet components in place of the usual STK IC"...




That's what has gotten me very confused,...

Re: RCA P52937 (PTK195) unusual convergence issue

Thanks for the quick reply, I did a thorough inspection of both the convergence main board and psb, top and bottom and everything looked good visually. I just went ahead and ordered an entire used refurb and tested convergence main board for it, $70 off ebay from a reputable dealer. I am hoping that the convergence psb is ok, since it seems to check out with a voltage test on the outputs to the convergence board.

I felt around the transistors after the tv had been on for awhile, and it has six heatsinks on the convergence...

I have a strange convergence issue with my old 2002 RCA big screen, Does anybody out there who tinkers with the older CRT big screens have any info on the convergence power supply board (number POWR-530), or the Digital Convergence Main Board (either DIGI-970 or DIGI-980) for a 2002 RCA p52937 with chassis PTK195M4B?

I know about the convergence power supply board usually going first, but the thing is, I have the advance convergence menu still, and its only the left side of the picture thats bowed/off slightly. Its adjustable to perfection on the entire screen, even where its bowed...

Re: New Members - please post your introductions here

Hello! My name is Bob, and I tinker with old school rear projection CRT tvs. I joined to get some opinions as to what has happened to my favorite tv, a 2002 RCA 52" with the PTK195 chassis. I love this old tv, I have a small place and i have to sit within 4-5 feet from the screen to watch it. I had the tv "tuned" convergence-wise so good that I preferred it to any newer technology tv; I had it super-sharp, and it was awesome.

It had developed an issue about 3 years ago that caused the colors to curve...