Comment/Reply from AVS Forum: Putting Money into Older CRT Projection TV’s

This post can be viewed in thread under the handle “Mr Bob” post 12705.  

Comment from flyinion:
“Well, my wife just told me I was nuts too after I suggested returning the plasma lol. I guess I just want to make sure I have the best PQ I can, and finding out the old RPTV could last another 8-10 years was kind of surprising. It’s definitely on the small side in our new house though with that 15′ viewing distance. I wouldn’t be throwing the RPTV out, but I wouldn’t be keeping it either. My brother in law is interested in it and was going to put it in the front room for his kids to use. I guess after 10 years it kind of feels like getting rid of an old friend lol.”

Mitsubishi Rear Projection TV

Reply from Mr Bob:  
I just completed work on a Mitsubishi WS 73909 Rear Projection TV, which had a problem with shutdown. On checkout, the convergence IC was blowing 2 of the fuses, so I replaced it. Then the unit would not come on, out of green blink. You know, the blinking green light of death? So I had to replace the 7 1000 uF caps in the DM module with the newly recommended (by Mitsubishi directly) 680 uF caps.

The unit finally came on and stayed on, and I started the requested calibration. After a while the screen just went blank. Menu OK, graphics OK, but no signal.

Upon checkout, I found the 1080i component jack had come loose from being stressed too many times by plugging and unplugging that component cable. I remade those connections by resoldering that jack back in place, even tho the pads were very delicate – it’s a multi-layer board with 2 giant (a full inch square) SMD ICs and the signal part of the jack was on feed-thru’s – and I had to do some very delicate soldering, using just one thin strand of a multi-filament wire – and finally it worked again and I could continue my calibration.

Then the signal disappeared again. And from the entire terminal board now. None of the inputs worked. I began to suspect the Denon AVR, as one if its inputs was dead and there was a buzz coming from his left speaker.

The owner didn’t want to spend more than $1000 on this project, but we now saw that we had a tiger by the tail. I had done enough of the calibration that he could now see the potential of his roughly 9-year-old CRT Rear Projection TV, and didn’t want to surrender to the plasma gods, especially since he had designed his entire home theater system around it. And a beautiful system it is! The guy is a tax attorney, and it was obvious he knew how to take care of his toys.

So he went online and found a replacement terminal board for $64, ordered it and a couple of days later it came in. I went over to where he lives in Walnut Creek yesterday, shored up the 1080i component jack in question before installing it – it also was stressed out, so resoldering it before installation was next order of business – and voila we had a picture again. Except that one of those channels on the AVR still didn’t work, the buzz was still there, and on 2 occasions the Mitsubishi lost control of its remote command potential and had to be turned off and then on again. More evidence, in my book, of a problem with the AVR, since the set worked fine at all times on my Accupel HD pattern generator.

We kept at it and finally the calibration was completed and everyone was happy. 3 repairs and a full calibration, over the course of 3 housecalls. We sat there and were mesmerized by the crisp, delicately saturated, non-pasty complexion fleshtones and sizzling, fully continuous non-strobing action sequences. Hypnotically involving and immersive. Perfect focus now, where it had been loose and mulchy. We even moved our viewing chairs in from 12′ to 9′ away, which we could now do, to see it all even better.

Especially with the beginning scenes of Master and Commander, where his Sony PS3 Bluray player does not deliver blacker than black on its component outputs (no Sony Bluray player does, it’s only there on HDMI). I explained that when he brings his Oppo Blueray player down from upstairs, where it’s currently being used on his Pioneer Kuro plasma display, he will then get to see shadow detail he is currently not seeing. Even so, he was absolutely blitzed by the fidelity of his picture.

The entire job wound up costing him $1740, and he is an incredibly happy camper. Grinning from ear to ear. He now has a set that will take care of him for years to come, and does not have to face spending tons of extra money and time changing his home theater layout. (For someone with an attorney’s income, that means a lot!) We have not realigned his color decoder yet to get rid of his red push. On his set we can, very directly – but the pic now compared to when I first got it going, is a completely different animal and he loves it. I think I’ll let him get used to having stealth grade video again for a little while before I approach him about that…


Robert Jones is a Professional LEVEL II ISF Calibrator. His special talent lies in using the Image Perfection protocol as the final and most crucial step in the ultrafine tuning of High-Definition Home Theater and Front and Rear Projection TV systems. He optimizes and extends the working life of Projection TVs to 20 years and beyond.  Bob started the popular “Don’t Dump Your CRT-RPTV!” thread in 2006. It has over 13,000 posts spanning more than 400 pages and it is still going strong. These posts can be found at  under the handle “Mr Bob”. Informational videos can be found at Youtube channel MrBobBigScreen. You can reach Bob directly at 510-278-4247 or Though Bob specializes in Pioneer and Mitsubishi projection TV’s, he repairs and maintains Flat Screen and Flat Panel systems made by most manufacturers. .com.



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