Question about Toshiba 57HX83 57" Rear Projection HDTV-Ready Television

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Poor focus on right half of screen

I bought this set used from a friend. He had moved it to a different location once and then moved it to my place in an enclosed trailer. I'm thinking it got out of adjustment, something was knocked out of alignment or maybe it was never properly adjusted in the first place.

I have downloaded the service manual. Don't know where I should start. Many terms are foreign to me. I am a master electrician, so I have a knowledge of multimeters and voltages.

I see how to access the service menu with the remote, but the remote hasn't been working well. Sometimes it seems to communicate and other times I can't get any reaction from the set.

There's a start.

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Re: poor focus on right half of screen

Could your problem be convergence and not focus?

Posted on Dec 05, 2007

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51F59A red screen all the time

1. entire grill below front screen must come off (usually held in place by screws in back on either side.)

2. locate and remove inspection plate dead center behind it.

3. Locate small black plastic block with 6 black controls built in; three (look carefully) left to right are focus--DO NOT TOUCH THOSE.

The other three are Screens and will be marked with tiny letters r g b (red, green, blue) and green is always middle.

Locate the red screen (not FOCUS).

With set on adjust red down just slightly(usually less than 1/8 turn.



Nov 20, 2011 | Hitachi 51F510 51" Rear Projection...

1 Answer

How to focus manualy

remove the back,there is a wing nut you undo on the lens on each rotate the lens by
pushing left or right and pull up the menu and
visually rotate the wingnut by watching the menu on the screen by moving the wing nut
left or right.then you also have electrical focus
these 3 focus controls are located by removing
the front speaker cover and are located on the
right careful not to turn the screen
controls that are with the focus controls.and
pull the menu up and adjust each control
the lens of each crt

Jul 15, 2009 | Mitsubishi WS-55511 55" Rear Projection...

1 Answer

Need to purchase a SCREEN FOCUS BLOCK. Where could I buy it.

Hi, this will probably **** you off but here goes anyway, That part can be purchased from on line parts places but my advice to you is "leave it to a tv tech". The part will NOT come adjusted to your tv, it has to be wired in correctly or you WILL damage your tv big time, once installed the set has to be turned on and all 6 controls WILL have to be adjusted, your dealing with a high voltage device and it can kill you if you handle it incorrectly once powered on, in other words you will probably never get it adjusted right and it`s dangerous to do by a non tech, just trying to help you out here, video-tek

May 29, 2009 | Hitachi 51F59 51" HDTV Projection...

1 Answer

Poor pictre quality

This set has 3 CRT's (picture tubes)
Remove the back bottom cover
Clean the CRT's with windex and a soft cloth.
(Find the Screen/Focus block)----Remove front grill cover and panel which covers the Screen/focus block.
Cover 2 crt's and adjust the focus control for remaining crt---(using the convergence pattern in the menu for the set)
adjust for the best focus.
cover that crt and move on to the next crt using the same procedure.
After setting the focus on all 3 tube's you will have the best focus possible for this set. If picture is still bad, you have bad crt's and the set is junk.
Cost to replace the CRT's is enormous!

May 08, 2009 | Projection Televisions

1 Answer

I have a blue wave on my screen


Your TV has a convergence problem. Here are some of the most common symptoms.

Screen looks 3D
One or more colors can't be adjusted when using the convergence menu.
Screen is bowed in or warped.

Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence or magic focus section.

Try to adjust the convergence.

You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

Its a fairly easy fix on the Hitachi sets.

You can get a repair kit that includes all the parts from The kit includes a photo instruction guide, original Sanyo STK chips, convergence resistors, etc.
Everything you need to fix it yourself.

Jan 28, 2009 | Hitachi 53SBX59B 53" Rear Projection...

1 Answer

Samsung HCN2446W -- Yellow/Greenish tint all over screen

That model should be HCN4226W, right? Because the other don't come-up. Sounds like the mirror may have moved. It's mounted on the upper part of the back of the T.V. Should be flat against the back. Check that. Then see if all 3 tubes are lighting up. Also possable the fluid leaked out.....but not likely. These sets are fairly robust. Do you remember jarring it in the drive home?? Did you have it laying down when you moved it?

Dec 14, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Akai PT4298HD Rear Projection

Perfect Focus and the convergence screen are for convergence, not actual focus. Real focusing is done in a combination of two ways: electrostatic and optical. And to do it right you need a good test pattern, like the convergence pattern from the Digital Video Essentials DVD. At a bare minimum turn your contrast down to half (don't use "dynamic" mode, ever).

This is going to sound scary, cuz it terrified me at first but now I'm comfortable with it:

To focus electrostatically, the front panel under the speakers needs to come off. As in actually unscrewing some screws and opening up your tv. Do all of this without cats or toddlers in the room. There are three circuit boards on which the picture tubes are mounted, and each board has a focusing knob next to the words "red," "green," and "blue." Do not touch ANYTHING other than these knobs. Twist the focus back and forth until it is as focused as it will get. The lines on the convergence pattern will get fatter or skinnier. If they get fat in one direction and skinny in the other, find the best compromise. Do not focus the blue too perfectly, as perfectly focused blue lessens the amount of blue relative to the other colors, making whites look yellowish.

Next you really need to clean your lenses, they are filthy from dust and that's why the focusing is so bad. For this tv, you'll want all three panels on the front to come off. That's about twenty screws, both on the sides of the tv and the undersides of the panels. The middle panel that covers the speakers can rest on the floor by the front panel, but the screen panel needs a resting place. An ottoman, or a chair with a towel on it, makes a good place to rest the screen (parallel to the floor).

Each CRT has a set of focusing lenses, and these can be removed. Do one at a time. They come off from four screws each. FOUR SCREWS. Do NOT unscrew anything else, as just under the lenses is a cover for the CRT. Take this off and you risk coolant leak, leading to expensive electrical problems. Do not, repeat, NOT touch either the lenses or the mirror with your fingers. One scratch is bad. Scuff marks can destroy a picture. These lenses and mirror are easily damaged.

There are some cleaning techniques there. I'd only bother cleaning the top and bottom of the lens assembly. Don't mess with the wingnut on the side, we'll handle that later.

Now, with your CRT lenses back on (wingnut facing towards the mirror), replace all of the panels and rescrew the screws. Next we do optical focusing. Again, this is where test patterns from a test pattern DVD come in handy. Regardless of what TV a person owns, a DVD like Digital Video Essentials is, well, essential.

This time we're taking a panel off the *back* of the TV. Scary, huh? Specifically, the bottom one (there are two big back panels). About fifteen screws, four of which are the same ones you do to get the front bottom panel off. Get all of the screws off, pull it back, and lift it out. Don't touch any of the electrical stuff. From here, if you are careful, you can reach up under the mirror and untighten the wingnuts on each CRT lens assembly. If you are using a test pattern, use a standard definition one here, makes the scanlines easier to see.

Here's what I do to focus each gun:
1) Put on a full screen of green, red, or blue, depending on which gun I'm focusing. DVE has just these patterns.
2) Untighten the wingnut, and start making minute adjustments.
3) What you want to see is *scanlines*, as clearly as possible. Make a tiny adjustment, get back around to the front of the tv, and see how well you can make out scanlines. An all-green screen should actually be a bunch of horizontal lines of green. If you can't make out these lines, you aren't focused.
4) If you don't seem to be making progress at all, switch to DVE's convergence pattern to make sure you haven't completely lost focus on that color. You want to start from good focus, and then fine tune very delicately.
5) You may find it hard to get blue-focus perfect. That's okay, really, as blue is a filler color. Green was very hard for me to see lines on, but it was a step up from not being able to see them at all.
6) You may find it necessary to go back and forth between electrostatic focusing and optical focusing adjustments to get them right. That's okay.
7) When it seems you've done the best you can, you're done. Put the back panel back on and rescrew all of the screws.

Now you need to adjust your convergence. You can use the user convergence menu, but it will only get you halfway there, because it only controls like nine or twelve points. What you want is to access the *service* convergence menu. With the tv on, press mute-1-8-3 on your remote (not pressing them all down, just in that sequence). You should switch to a secret built-in convergence screen.

I hate to tell you this, but the only way to save settings made in the service convergence screen that I know of is with a Samsung remote, not the Akai one. This tv is actually a Samsung after all, and the Akai remote is missing some buttons that the Samsung remote has. You can buy them off, among other places. Here are what the buttons do:

7-allows you to control red convergence
8-allows you to control green convergence (what the screen defaults to)
9-allows you to control blue convergence
+100-turns red on or off
0-turns green on or off
pre-ch-turns blue on or off
circular direction buttons-moves the cursor to a new convergence point
channel up/down-moves the convergence up or down
volume up/down-moves the convergence left or right

add/erase-saves settings after blinking the screen and centering the cursor

If you can find a button on the Akai remote that does that, you won't need to buy a Samsung remote.

BTW, you'll want to do this service convergence on each scan rate. So one for 480p (from a progressive scan DVD player), once for 480i (s-video source or non-progressive DVD player), and once for HD (I use my HD DVD copy of DVE).

Feb 05, 2008 | Akai PT4298HD Rear Projection Television

2 Answers

Green shadows surrounding bright whites

finally a consumer that gives us plenty of info :)
sounds like an overdriven green tube, the only thing you can try is to find the G2/Focus block assembly, either behind front speaker grill or remove back of set and look for a black box approximately 5"X5" , this box will have 6 philips type adjustment screws(plastic) 3 are for focus, do NOT adjust these,
the other 3 are marked "screen" the center screen adjustment screw is for green, turn it VERY slowly counterclockwise while the set is running and pray that your problem dis-appears, be advised that this is a HIGH VOLTAGE device so one hand in your back pocket the other hand turns the screwdriver, if the problem does not go away you have a poor green tube, good luck, sorry I can`t give you the exact location of the G2/Focus block, manufacturers move them to different places every year.

Nov 29, 2007 | Mitsubishi WS-55809 55" Rear Projection...

1 Answer

Half the screen has ghost image (not focused)

Replace the convergence ICs. They are located on a large aluminum heat sink with STK numbers stamped on them. They cost about 10.00 each. They have to be soldered in. Let me know if you need anything further.

Aug 23, 2007 | Sony KP-53S65 53" Rear Projection...

1 Answer


Your set has what is know as "convergence problem" because of the bowed lines and ghost in different colors,is really not an easy solution,the set should have 3 amplifiers(one for each color)and they need to be replaced with an exact replacement,sometimes just by replacing them the aligment should be close but soemtimes you nned to get into the service menu to do some adjustments,the amps(IC's) are mounted on heat sinks and all 3 have the same part number on its face,they normally read STK--- ---,every set uses different amps,If you are familiar with tv service you have now a place to start working but if you are not too familiar be safe and call for help from a servicer.Let Us know if you need more information.

Oct 31, 2006 | Akai PT5598HD 55" Rear Projection...

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