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Toshiba 42H83 42" Rear Projection HDTV-Ready Television Questions & Answers
My toshiba 42h83 tv has sound but no picture
of course check different inputs etc to make sure something did not get disconnected.This rear projection set uses 3 picture tubes and the set will protect them if there is a problem in the vertical or horizontal sweep circuits that might burn the screens or the damage the tubes.No simple answer as a lot of different parts are possible for this problem.
I have a Toshiba 42H83.
If you just moved it is very possible that you had some week solder break loose at your convergence IC. Reflow the solder on all pins and see if that does not fix your problem.
Can we seperate the tv
You should be able to take the screen off and the top black plastic shroud that holds the mirror off to transport it.
1) To do this, you will pull the speaker grill cover off on the front bottom.
2) I think there are four screws at the bottom of the screen holding the bottom in place. Use a 1/4" socket.
3) Disconnect the wire harness going to the screen by squeezing the tab on the connector - very easy to do.
4) Remove all the screws on the black plastic shroud - about 8 of them. Have someone hold your screen and gently lift the screen off. The black shroud I think still has some screws holding it in place that become visible once you lift the screen off.
5) Once the screen is off, there should be a set of screws that are holding the shroud down. Remove those and gently put the shroud on the floor where the mirror cannot get damaged.
6) Installation is reverse of the above.
Note: This would be a good time to clean the mirror and tops of the CRT bulbs. It will make your picture much nicer if it hasn't been done. Use a non streaking glass cleaner on the mirror and bulbs. For the screen, just wipe it down, don't spray it with glass cleaner.
When i turned the t.v
The convergence chip that was supposed to control the blue CRT has failed so the convergence board must be refurbished. Here is the repair kit
http://www.tvrepairkits.com/xcart/product.php?productid=21827&cat=2726&page=1
Toshiba 42h83.... The blue convergence will not
bmarino18,
Initially I would have told you to replace the convergence ICs but after reading your post carefully I think you could have a problem with the convergence box. The lines can only be bent/curved for two reasons. One - the yokes are bad causing an undue strain on the power supply and not being able to correct the problem. Two - the convergence box/board is bad and is not holding the settings causing the curve you see. I cannot tell you which problem you have. You wil have to determine this. I do have a tip at
http://www.fixya.com/support/r4273935-replace_digital_convergence_box which may be helpful.
Thanks for using FixYa and for the great rating.
hardrocko
Light yellow line through center of screen from
You do not have a lamp in that model. You ave 3 individual picture tubes like an older glass tv style except tubes are a whole lot smaller. The yellow line you see is most likely caused by a foreign substance hanging from the mirror or laying on the face of one of the picture tubes. If your mechanically inclined and would like to take the back off you will see what I mean and be able able to clean your mirror with windex and the face of the tubes. See if that's the issue and let me know.
How much is the tv worth used
If this TV is working fine...The first 250 to 300 bucks should be a reasonable high end price. Unfortunately if this TV has any kind of problem it may be worth much less.....50 bucks. And if it does not work...nothing! Everybody wants a new flat screen and will pay new prices to get one. The older projection and tube TVs are almost worthless now! Thanks for asking and show a few hands of support!
The blue won't align with
HI:
One of your convergence IC have failed. I recommend having both of them replaced as the other may not be far behind to fail also, They are large OP-AMP IC's that control the beam in each of your picture tubes. They may use the part# STK-392-110, google this number for better info on the IC's and where to get them. If you know how to solder and unsolder electronic componets then you can install them yourself, saving you some money. They are the two or three LARGE BLACK IC's mounted on a large metel sink. Typical price for most local shop to repair this problem is $130-$210.00 depending on what IC's part number is installed.
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