CRT based RPTV Convergence Repairs

**lcaillo** · **09-23-09, 05:18 AM**

To me this is very American, whether you are American or not. It is the willingness to take a chance to make something happen, to do what we have never done before, or to just make things work better that has made this country great and unique. As I have said before, DIYers and the desire to do things better or more efficiently have been at the heart of much of the innovation that has occurred in our industry. Many of the great designers, and many of the best techs started out as DIY tinkerers.

**drdoan** · **09-23-09, 09:49 AM**

Welcome, and glad the Shack could be of help. Have fun. Dennis

**bt10** · **09-26-09, 12:45 AM**

Hello,
Does anyone know if Hitachi has a kit for their 51F500? If not specifically for that model is there an existing one that would be a close fit? I have been searching high and low and haven't had much luck. I even called Hitachi's technical / customer support number and after looking a few kits up for me based on the part numbers I gave them they indicated that they were not for the 51F500 model. Without being much help they recommended I don't attempt the repair myself and simply call a qualified repair person. Worst case I am thinking about using the website which provides tv repair kits but they list using STK392-110 & STK392-150 IC's and the price is about double what some of the kits with STK394-160 IC's are listed at.

Any help / insight is appreciated.

Thanks in advance.

**lcaillo** · **09-26-09, 03:00 PM**

There is no Hitachi kit for this set. I just use the STK394-160 from one of the other kits and the same value resistors that are in the set and have never had a recall. Whatever you do, don't use the -110. You can at least update to the -150.

**Watcher** · **09-29-09, 11:47 PM**

I have a 2002 Mitsubishi WT-42311 with failed convergence. After reading this thread, I tried to find the Hitachi repair kit from a number of the suggested sources. This was tough. It seems no one had any in stock, it was back-ordered, and ETA kept creeping further into the future. I finally found it at Sears online parts and got it, $39 after a 10% discount, plus shipping. It has the STK394-160 ICs and resistors. I might need to replace fuses, but don't know yet until I get into it, and those aren't included in the kit. I plan to buy Arctic Alumina thermal compound at Frys for a couple bucks, and I should be ready to get at it.

**lcaillo** · **09-30-09, 07:55 AM**

You bought a Hitachi kit. It will not have the parts you need to fix a Mitsubishi. You can try the -160 ICs, and they may work fine, but the resistors are for a particular model Hitachi. Understand that there have been reported issues with subbing in some brands and models. I do not recall specifically on this set, as very few of them have had convergence IC issues. They usually just need to be resoldered if anything. I have also seen bad caps in the convergence power supply in these. If you want a kit for a particular set there are vendors that put them together like TVRepairkits.com.

**bt10** · **10-03-09, 02:35 AM**

Thank you lcaillo for all of the information you have posted in this thread and for your quick response! Is there a Hitachi kit that might closely match what I will need for the 51F500? If not is there one kit that is better than the others (higher availability, cheaper, always has the stk394-160's, etc...)? Also, is there a list of resistors (and resistance values) related to the convergence circuit for this model?
Thanks in advance!

**lcaillo** · **10-03-09, 03:30 AM**

Specific information about the parts in a particular model may be found in the service manual for that model. Info about the Hitachi kits is in PDF file linked in post nuber 4 above.

**bt10** · **10-03-09, 03:39 AM**

I have looked at the pdf's of each repair kit in post number 4 (thank you for all of that information) but where can I find / buy a service manual?
Thanks

**lcaillo** · **10-03-09, 03:42 AM**

http://www.hometheatershack.com/foru...ful-links.html

Has some ideas, some free sites some for a fee.

**Randallray** · **10-04-09, 08:30 PM**

Hello,

I am brand new to the Shack and I have really enjoyed the info on this site.
I have repaired my phillips 60in (9 years old) set from the info you have given here and it worked but I have a few questions.

First the blue convergence seems to have a glow about it. I notice it most with something white against a black background. I hope that makes sense. Can that be adjusted?

Second it seems like I have to keep adjusting the red convergence. I am storing it in memory so I am not sure what's going on there.

Once again thank you for all the great info.

RandallRay

**lcaillo** · **10-04-09, 09:37 PM**

Look for info on coolant contamination in the Philips forum for the blue haze.

With respect to the red convergence shifting, are you letting the unit warm up? How often and how far out is it?

Please start a new thread in the Philips forum with more info.

**Steve757** · **10-05-09, 04:27 PM**

Thanks for building such a complete thread. I have a nine yr old Hitachi 43" projection TV that threw out the green image after a power brown out. I was resigned to have to spend 1000 on a new TV when I found this forum. Most of the Sanyo chips are discontinued, but the 392-150 series is readily available. I ordered a couple and some resistors and had the job done in about two hours. It appears that the heat simk compound dries out over a long time and isolates the IC's from the heat sink, then they burn up. The TV is like new now , and in the TV I found a pair of heavy duty lines that are "switched" AC going to the main power board. I cut a six inch hole in the fiberboard backing plate and mounted a small ac desk fan spiced into the switched ac line, so that it blows right over the heatsink and forces hot air out of the cabinet. It only runs when the TV is turned on. So far the image is back to factory specs.

Note--when you put the chips in remember they do not have straight leads, but curved springy leads that have to be compressed slightly to get the mounting holes to line up on the heat sink. Don't acccidentally bend the leads when putting them in.

Steve

**mbrown224** · **10-19-09, 01:43 PM**

Do you call this a Convergence Problem that might be solved by replacing the Convergence ICs? I have a WS 55809 Mitsubishi where the green gun seems to cause curved lines in the Convergence adjust pattern displayed which normally looks like a series of straight horizontal and vertical lines. You can then select either the Red or Blue gun to line up with the green gun to ultimately change all the lines to white when the Convergence is correct. When my TV suddenly had what appeared to be a Convergence issue, I went to that adjustment screen and saw three of the vertical lines in the left hand part of the screen with a pretty good size "bow" in them toward the middle of the screen. There is no way to adjust the green gun Convergence so the TV is now unwatchable. Do you think this is an IC problem where only a few (3) vertical lines have a bow in them - so much so that the blue and red cannot be "adjusted" (mis-adjusted) to line up with them. Your opinion would be greatly appreciated.

**lcaillo** · **10-19-09, 03:02 PM**

Please read the first ten posts of this thread very carefully. It sounds like you do have a convergence problem.

**drdoan** · **10-19-09, 03:48 PM**

Welcome Mike. Yes, does sound like a convergence problem. Have fun. Dennis

**Steve757** · **10-19-09, 06:04 PM**

My initial symptom was that the green part of the TV image shrank slightly and the lower left corner warped inward. I could not set the green comvergenge lines left or down...just up and in. The red and blue were still fine. After I replaced the two chips (convergence amplifiers) and the resistors, I cleared out the memory for the digital convergence and then did the coarse through fine adjustments. A lens cleaning is also in order....it really helps. The TV is like new and contrast is darker, due to the lens cleaning. Good luck!

**Krankshaft** · **11-01-09, 06:28 PM**

Don't forget to clean the mirror too!

I remember when I did my convergence in April of 08 I removed the lenses (4 screws) from the CRTs and cleaned both sides and also cleaned the glass heads of the CRTs (the top of the coolant chambers) because dead flies were down there yuck!! Just make sure the lenses go back on the right tubes or you'll be loosening the wingnuts and adjusting focus.

A microfiber cloth and 90% rubbing alcohol is the best for lenses. Distilled water is good too but it won't evaporate as quickly. The focusing lenses are plastic so you have to be gentle with them.

Advertisement