Originally Posted by knotslip
Thanks for the responses. This site is great. I am also a member at *************** and both sites are a tremendous resource for home theater buffs like me.
I am in touch with D-Nice for a calibration but I'll keep the others in mind in case the scheduling doesn't work out.
I have a 55" wide screen Mittsubishi that is having some issues (not sure of model but it is the Platinum Plus and 5 years old)...And they are very strange issues...Sometimes the tv is normal and watchable other times it is nearly unwatchable. The strange thing is that it can exhibit different symptoms at different times and sometimes all of them at once. It seems mainly to be a convergence issue as I see red, green and blue images on the screen but I also see a warp on the left side sometimes and horizontal lines static other times, etc. Very strange though because it sometimes is just normal. Any recommendations? Should I trash it?
Sorry for not seeing this back when you posted it, I have just now tuned into this particular thread. I have been busy with other threads I spend lots of time on, here at the AVS.
What you are seeing, if it's what I think it is, is very common in CRT RPTV tech, which is why I was surprised to see it here on this thread. Flat panels don't have convergence issues of any kind, so yours has to be a CRT, to have the kind of symptoms you are describing here. What is your model?
The conv ICs run ungodly hot in there - and even worse when the original geo/conv paradigm has not been set up right at the factory, again very common in the Mit's - and the legs often eventually go to cold solder condition. On some of the xxxx9 series, the legs also go cold solder AT THE IC ITSELF - both ends of the legs suffer cold solder condition, in which case it's best to just replace that IC and be done with it.
Heat/cold/heat/cold translates into expand/contract/expand/contract at the legs in the pads themselves, at each contact point of the legs of those ICs. After enough time, the solder there wears out, going to "cold solder" condition.
The remedy for this is to either get those legs resoldered, or if it has gone too far and the ICs have been run ouside design parameters for too long and have croaked, to get the ICs replaced.
If it's still intermittent as we speak you have a chance to save the ICs, by not allowing it to run in the bad condition for more than a few seconds any time it goes there - shut it down as soon as it freaks out, in any way, let it cool off and see if proper ops come back.
But that will only be a good solution for awhile, as the joints continue to get worse. The only 100% good solution to this problem is prompt and professional grade attention, mentioned above - either resoldering or replacing those ICs.
Lots of DIYers repair their own conv issues, it's one of the most DIY friendly repairs in the industry.
Contact me directly if you want personal coaching on this, or to have me do that repair for you. NOT by pm please -
BTW, no I don't think you should trash it. Not in the least. CRT tech is still awesome. I have had huge amounts of fun with the entire CRT RPTV line of HD displays, and firmly believe in them, they are only at cruising age by now in their lifetimes, when well treated. You can find evidence of this at my "Don't Dump Your CRT RPTV!" thread. Since this is a fixed pixel/flat panel display thread, I didn't anticipate seeing anything here having to do with CRT, but since you asked...http://www.avsforum.com/avs-vb/showt...95922&page=168