Question about Toshiba 55H70 55" Rear Projection Television

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Red is off, and dark

The red is off and I can't adjust it back in, it is really bad. I also have a problem seeing the screen when its dark on the program I'm watching. I was thinking convergence problem?

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By your comment, the red being off, I assume you mean that it won't line-up with the other two colors. A common problem in this unit is convergence. In this unit Q751 and Q752, both are stk392-110 should probably be changed. For a more reliable amps use an stk392-150 instead. Also check all the 1.2 ohm resistors that feed the amps. They're marked in board location starting around R7711 and should be tested for value. Any that have changed replace them.

Posted on Nov 05, 2007


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Red Lines through picture when screen is dark, back ground has a red tint. On my 48 "Sony Rear Projection" TV

You can try adjusting the Red color output. (Very touchy adjustment)

If you take off the front cover/speaker cover, there should be a access panel. Behind that, there should be a small square black box with 6 screws on it. This is the focus block. (At least this is where most of them are located)

It sounds more like you may need less red in the mix. There is a screw for each color. R, G, and B. Do not mess with the focus screws, just the ones labeled 'SCREEN.'

Go to an unused input where the screen should be dark. Barely turn the red down in a dark room so that the red spot is at the same level as the Blue and Green.

Use an insulated screwdriver and DO NOT TOUCH the focus block and ESPECIALLY NOT the back of it.
Very HIGH VOLTAGE. I found that out the hard way.

Do not turn any of these up too high or damage may occur and the TV may detect a short and shut off.

I have found that if the three colors are adjusted in a dark room to where the 3 color spots (R/G/B) are just barely visible on the screen at equal levels, there is a pretty good color balance.

I hope this helps! Just be careful.

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1 Answer

Color was bad couldn't adjust it better , then last week red curvy lines showed up on the bottom om screen . opened the back and found 6 adjustment knobs slowly turned one and screen went dark. repowered...

sorry but those adjustment are not the right one , to correct the color problem u have frist , u need to hire a tv tech , tv would has to adjust the screen and focus back to normal after that , need to replace the oil on green and blue picture tube

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Red arching lines showing up on screen promident when a dark background is present

Red picture tube needs screen voltage adjust. Open fornt or back of TV and look for a black square looking box with adjustment knobs. Look for red screen adj and slowly turn rt or lft until lines just disappear. If screen goes too bright tv will shut down, just turn back on again and retry

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First check what color of faint lines comes then reduce Screen Volts in TV of that CRT (tube)
Take off lower front cover, speaker grille of TV, there you will see focus control block that has 6 control knobs, upper 3 knobs are focus adjustment of red-green-blue CRTs and lower 3 knobs are screen volt controls for red-green-blue CRTs. Turn screen volt control knob CCW to reduce screen volts of desired CRT.
Put TV on any free AV input so screen will be dark enough to adjust screen volts.

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1 Answer


Good Day, Butchilee,
Sounds like you have patience, hope your TV has some trace left. Hit recommends that you replace the originals with
STK-392-150's and the resistors. Replace said items with care then back down on the screen/ focus controls and gradually bring the screens up until you have pic, adjust focus. Go into customer menu and adjust color down, set brightness to 50%, contrast to 100%. Then go back and adjust the screens for proper, black/white, tracking. AND It's best to double check the soldering connections.
Good Luck, Big Irish.

Jul 04, 2008 | Hitachi 53UWX10B 53" Rear Projection...

1 Answer

Red Bowed Lines / Red Hue

I tried the solution that was posted for this problem and it worked!
Just remove the Low front panel by removing the two bottom screws that are covered by two screw covers, then remove the second panel (black) by removing the 4 screws then you'll notice a module with 6 adjustment knobs, get a small screw driver, and with the t.v. on, being carefull , and with somebody accross the room looking at the screen begin with the lower left knob and turn left very slowly and ask the person across the room to let you know if the screen is better or not, after this I had to adjust the green as well so, I adjusted the next knob over to the left. Do this adjustment carefully and try to remenber the original position of the knobs in case you have to go back.f
Good Luck,

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1 Answer

Tv red screen

nice to have model number.
tap on crt board with a plastic handle see if it goes away.
otherwise it sounds like the tube is bad, you could also try to adjust the red brightness screen

Feb 01, 2008 | Televison & Video

2 Answers

Dark picture (HELP)

Open up the back of the set but be very carefull. Notice a large black block with a large red wire that runs up to the picture tube. on one side of that large block where the thick red wire is comming out of are two controls, one should be marked focus or F and one should be marked screen or S. With the set operating normally and not touching anything else, slowly turn the control marked screen or S clockwish till the picture gets bright enough. If you go too bright the set will shut down or you see small thin white lines so back down on the control. then touch up the focus and your good to go. good Luck.

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