WS-B55 Error 22 - Opinions and thoughts needed!

**ThatguyfromMN** · **10-18-09, 07:57 PM**

Hey, first off thanks for any help that you guys can provide. This looks like a great board filled with people that know what they are talking about.

I have a Mitsubishi WS-B55 that my wife and I picked up from a co-worker of hers for $25 non-working. I was looking for a new project so I was into it! When I tested it, it did the from what I have read standard green light blinking for 70 secs or so. When you would press the power button you could hear a click and then another click about 2-3 seconds later. I did the error code test and came up with error 22. I did some searching and found that I should check the fuses. When I checked them everything was fine except F9A05 which I found was related to the convergence IC. I jumpered the fuse with a jumper that contained an inline fuse of the same value just to see if that would blow also, not knowing much about these tvs I was hoping it was an isolated power spike or something, and I know it is never good to jumper a fuse but I didn't really have much to loose and I used a fused jumper. Anyway that fuse also instantly blew. I then pulled the center most board out of the tv that contains the convergence IC (my set only has one) and the fuse that I mentioned above. I desoldered the convergence IC and then put the board back in the TV to see if the TV would start because I read if the convergence IC was bad it would boot without it. I again jumpered the F9A05 fuse (i know thats bad) and after it did its 70 secs of green light flashing after plugging in, it did start. It just did not have the convergence correction obviously.

So here is my question. Is this FOR SURE a problem with the convergence IC being it works without one installed? Are there any other things that could be bad? I have read that it is a good idea to check the resistors in the area of the convergence IC chip. They all look fine but I will be testing every component on that board that I can being the new convergence IC won't be here until at least Wednesday.

I am open to ANY and ALL ideas, questions, and suggestions.

I took pictures the whole time that I was working on this so if you need any pictures I have them.

Thanks!!!

**lcaillo** · **10-18-09, 08:27 PM**

Yes, the convergence IC is likely bad. Yes, there are other things to check.

Read the first ten posts here very carefully:
http://www.hometheatershack.com/foru...e-repairs.html

That should give you most of what you need to know.

**ThatguyfromMN** · **10-18-09, 08:41 PM**

Thanks that thread you reccommended is very informative. I am going to replace the fuse and the IC and hope for the best.

I did see a post about checking the 24v power supply. Do I check that at the point where the 2 wires are jumpered from the power supply board to the board that has the convergence ic on it? Do I test it hot?

And if I do get it running, do you adjust the convergence via the on screen commands?

**lcaillo** · **10-18-09, 08:54 PM**

You test the power supply voltages at the ICs. Be sure to check the resistors.

The controls for convergence are described in the service manual and are operated by remote control in the on screen menus.

**ThatguyfromMN** · **10-21-09, 05:46 PM**

Ok I checked all the resistors that it recommends. When I check the 3.9 ohm resistors (example R8C30 which is rated for 3.9 ohm at 2 watts) I get a reading of 2.1 to 2.2 ohms each. I figured this was normal being they are parallel. Is this a normal reading for these? I just wanted to check so I don't fry the new IC that comes tomorrow.

Thanks again!!

**lcaillo** · **10-21-09, 06:59 PM**

Yes, 2 3.9 ohm resistors in parallel would be half that resistance. Add a bit for lead resistance and you are probably fine.

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