Question about Toshiba 55H70 55" Rear Projection Television

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Replace tube I have removed the back pannel and can see the tube that doesn't light. But it looks like it would be more accessable from the screen side. So how do you remove the screen.also the blue went out came back for a short time and went out again.so I assume it's the tube. Thanks,John

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  • jpgrizz Feb 02, 2013

    what I found when I checked the tube connection was a loose connector I spread the pims on the tube and reconnected it, after which the tv worked great. John

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I drought it's the tube if it comes and goes, sounds like a loose connection. http://serviceman.site88.net/index_files/MP3Players.htm

Posted on Jul 01, 2008

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I have a rear projection Toshiba model 62hm95. I have a rear projection Toshiba model 62hm95. I have a rear projection Toshiba model 62h


There is no bulb to replace on a rear projection set. It uses 3 separate picture tunes 1 red 1 Blu and 1 green coupled to magnification lenses that focus onto the mirror which the directs the image thru the screen. Access is usually by removing the trim ring and screen from the front. Access from the back only gains access to the circuit boards. Be very careful as each tube has its own high voltage transformer which can have from 50000 to 150000 volts.

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My mirror is cracked on my toshiba 46hm84. How Do I replace it myself


Here is a picture of the front bezel removal to get access to the mirror.d11d1b4.jpg

Sep 19, 2008 | Projection Televisions

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1. My Sony KP-57WS500 TV is turning blue after abut 3 minutesof operation. It stays that way for about 30 miunes and comes back with pictures again, but with predominatly blue color. 2. Sometimes the TV...


Sounds like the picture tubes are failing,common on sony. do you notice any thin horizontal lines? You mite get lucky and be able to adjust the voltages. Remove back cover and look inside to see which tubes are lighting up.The front panel below the screen will come off and behind it is a small access cover.remove it. there you will find the voltage controls (its a plastic square with 6 knobs). 2 knobs for each tube, 1 is focus the other is the voltage labeled "screen". they are marked so look closely. Green is always in the middle but sometimes they flip the controls for red and blue so pay attention to which you are controlling .slowly adjust screen voltages to see if you can get it to stay on. If you over do it those thin horizontal lines will pop up and the tv will shut off again. If you already have lines back off the voltage by turning knob to the left slowly until they diappear. If that seems to fix it but the problem but it comes back later, then the tubes are shot. good luck!

Jul 05, 2010 | Sony KP-57WS500 57" Rear Projection...

1 Answer

The blue will not converge, how can I manually do it? The blue appears to be showing bottom left corner below the screen, like it got moved.


I had the same problem but it wouldn't converge on the whole right side of the screen. I fixed my problem by taking off the speaker cover, removing the 3 allen 7/64" screws from the front of the bottom of the button pannel, then removing the 4 scew from the back of the pannel (2 on each side), and the button pannel should drop down. With the power on I cleaned the 3 projection lenses with many qtips dipped in alcohol. I left the TV on so I could see if there was any streaking on the lenses (streaking means it is still dirty). Once they were all clean and I put the button pannel back on, I went to the menu and ran the autoconvergence function. Now my picture is so clean. Good Luck.

Mar 03, 2010 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Toshiba 42" suddenly has blue arc projecting through lower half of screen. Confirmed it was the blue tube by removing the projector lens and looking at the direct image.  Is this a bad tube or something...


Hello,

This is not a bad tube it is a convergence problem. Your convergence amplifiers are malfunctioning, and need to be replaced. If you have a background in electronics, you can remove the back of the TV locate the Convergence ICs (using the schematic or service manual) and the order the parts you will need which are the two convergence ICs and the biasing resistors (you will see these on the schematic). To remove them unsolder the pins, unscrew the screws holding them on the heat sink and remove them carefully, if they stick use a solvent to break down the adhesion of the heat sink paste. Once loose, take them out and then unsolder the biasing resistors and replace them with the ones you ordered along with the ICs.

To install the new ICs put heat sink paste on the back of the ICs and insert the pins into the proper holes in the circuit board. Screw the screws back in securely, and solder the connections back.

After doing this you will need to perform a convergence adjustment, using the cross hair adjustment screen (access this from your TV menu). and the you will need to do an advance adjustment using the crosshatch pattern (also accessed from your TV menu).

Once these are done use you service manual to follow the procedures on locking the adjustments into the TVs memory.

I hope this helps,

Thank you,

Shuttle83,

http://www.electron-age-technologies-llc.com

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1 Answer

Hey own a 2003 hitachi model #46f500. love it a lot,but has a tint of red on screen. when dark movies are on gets real dark. when its day light on tv it looks great. info please


It sounds like the CRT tubes are weak which will not practical to replace them.

But try to clean the dust on tube first and if it doesn;t help do this...

Caution!
Risk of electric shock, focus block carries 4 kilo votls, do at your own risk or DO NOT do it at all.

Just try to adjust the screen voltage adjustment to brighten the 3 tubes from focus block, to do this you have to open the back then let the TV run for abut 10 minutes beofre adjusting, each tube has its own screen voltage adjustment, read the label make sure not to tuch the focus adjusment, do not crank up too much make it very slow or your TV will show retrace lines or it will shutdown.

good luck.

Feb 27, 2009 | Hitachi 46F500 46" Rear Projection...

1 Answer

I have a Sony KP-57WS500 and there are arched, thin, and horizontal lines that appear.  Where could I find agreen picture tube or can I adjust the voltage myself?


Remove the front speaker grill and you will find an access panel (2 screws are hidden behind 2 little plastic caps at very bottom of speaker grill,just pop uot to access screws) .Remove the panel and you will see the picture tubes.In the middle you will see a little black control pack with 6 little knobs.The 2 in the middle are the green controls.They will be labled screen and focus.You will have to look hard for which is which.There may be glue over the controls if so just remove it.Slightly rock the screen control back and forth to adjust retrace lines out.If the unit shuts down during this process back it off a little and turn the set back on and proceed.

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1 Answer

Kp-51ws510 picture issues


Bob, remove the front speaker panel and you will see a small access panel remove that also and you will see a small block with 6 dials on it. three on top and three on the bottom. Look closely at the dials and you will see focus for 3 of the dials and Screen for the other 3. The dials marked screen control the drive amount for each tube and are laid out like the tubes green dial in the middle and blue dial on the same side as the blue tube. try turning the blue tube down a little. If that deosnt help you will no doubt need a new blue tube, which is a fairly common problem with that model Sony. If you require more assistance please let me know.

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2 Answers

Water marks.


yes take the pannel off the back. be carefull your mirrors are in the pannel

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1 Answer

Home theater


The front pannel,on and off channels and vol. switches are going bad,if you dont use the front pannel, unplug the set and remove the back cover,just below the top screws you can look under and see the top of the picture tubes,in front of the middle tube is a little board about two inches wide and four inches long,unplug the right plug it has one black and five or so white wires,this is the top cable,then just use your remote.

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