Question about Toshiba 50HX70 50" Rear Projection Television

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Im having a convergence problem with my 50HX70. The tv was working fine until one day i turned it on and there was a blue shadow on the bottom half of the screen. I tried to adjust it and the horizontal part of some of the crosshairs is at an angle instead of being horizontal. Do I just need one ic (stk392-110) for the blue lamp? Or could it be something else? Where is the ic for the blue lamp located?

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Tv have a dead convergence board.The convergence board require replacing 2 STK convergence ICS and some or all of it resistors too.To fixed the convergence board to fixed the tv picture convergence problems.U have all tools and can do soldering?Yes,tries websites like Tvrepairworld.com,Tvrepairkits.com to buy a convergence kit to repair it urself.Or the shop,will $300-350 for parts and labors.

Posted on Mar 18, 2011

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Posted on Jan 02, 2017

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It looks like the bulbs are not aligned. The upper half of the picture is fine. The lower half has the red above the blue to there is double picture. I just picked up the TV for free. Any suggestions?


This tv have a problems known as a convergence problems,it dead.The tv colors lines R,G,B mis alignments,have colors shadows pictures or 3D pictures look alike?The tv convergence board have 2 dead STK convergence ICS and some or all of it resistors are dead too.These parts on the tv convergence board,must be replaced to solved the tv convergence picture problems.The shop,will cost u like $300-350 for parts and labors.

Dec 13, 2010 | Toshiba 55HX70 55" Rear Projection...

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Good day!!!I i had problems with the fl 231 fuse on my RCA D52W23 proj.tv....i...


FL231. FUSE.... The RCA ITC222 chasis has a common problem. and it not all that difficult to repair. Does your rca projection tv have read blue and green shadows? Does it have bowing in affect on the top and bottom of picture? when you turn it on does some thin red green and blue line bow in from the top then go away. The main question to determine if you have the fl231 fuse problem is if you go into customer menu then setup do you have the "CONVERGENCE' option. If you do not. then i suspect you have this problem. In the manufactering of these sets Lead free solder is used. now there is great debate over the use of lead free. connection tend to be more brittle. cracks develop around the solder connections of the high voltage flyback transformer. this very small crack set up oscillations in the cuicit with a 400 milliamp fuse. THis fuse cant take it. When this fuse blows the processor then does not know its a projection tv with three projection tubes. it thinks its a crt tube tv. and crt tube tv dont need "convergence" so it removes the convergence from the set.

TO REPAIR... 1. Warning. this set can generate leathal dangerous voltages even unplug do not attempt if you have no experence with electronics.
2. Remove the back. there a number of torx 20 screws.
3. what you will see is a number of circit boards There will be one on the right and one on the left. the one on the right is the small signal board. the one on the left is called the power deflection board. it has a large black part with a big red or black wire coming from the top, this is the flyback.Next to the flyback on the right of it there will be three small rectangular componets tan or brown in color. these are fuses. the one in the middle is the fl231 fuse.
4. getting to this fuse can be difficult. these two cuicit boards sit on a tray that is removable. to remove this tray it is pulled out and up. BUt watch the wires.loosen the wire tyes.
5 when you get the tray up the bottom side of the board can be accessed
you will now have to unsolder that fuse. one side of this fuse is under a plastic part of the tray. i have found the easest way is to cut away the plastic to get to it. if you dont want to do this you will have to remove the board. only remove half of the plastic brace
6. REPLACE FUSE RCA PART 259213
7 RESOLDER FLYBACK CONNECTIONS simply heat up and add a little solder
8 reassemble set. make sure you examine the set for loose connections.
9 and remember "BE Careful'

on Jan 14, 2009 | RCA R52WH73 Projection Television

1 Answer

Red and blue overlap shadowing


Sounds like a convergence ic problem, normaly i tell people to replace the ic's but in your case try to re-solder the pins on the ic first, you may just have some pins broken loose from the board. Locate the stk392 ic's there will be two of them located on a heat sink, unplug the tv and get to the bottom side of the board and re-solder the pins. if this does not work, then replace the ic's

Sep 02, 2009 | Mitsubishi WS-65807 65" Rear Projection...

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MY TV NOW SHOW BLUE AND YELLOW AT THE TOP AND


i have a 52 in rca tv and i turned it on and now there is a blue and yellow stripe at the top and bottom of the tv. and the people have a blue shaddow around them ? how can i fix this?????

Aug 25, 2009 | Hitachi Televison & Video

1 Answer

Colors shadowing eachother, adj convergence, but will not save.


Sounds like your convergence IC chips have failed. You can buy the parts from various suppliers or you can just get a complete repair kit from www.TvRepairKits.com

Mar 15, 2009 | Philips 46PP9302 46" Rear Projection...

1 Answer

50hx70 blue projection light is concaced at top and bottom of tv


When the convergence amplifier ICs go bad (STK392-xxx), they RARELY cause more than one color to go out. The fact that the top and bottom of the picture are effected indicates the vertical convergence IC. Replace both, and while you're in there check the bias resistors... it is likely one of these is open. Once the ICs have been replaced (as well as any open resistors), customer convergence followed up with the auto convergence should do the trick.

Nov 19, 2008 | Toshiba 50HX70 50" Rear Projection...

1 Answer

Toshiba 50HX70 Convergence reset


press mute button once after press and keep pressing mute again and press de menu button on tv .when tou see S on screen press 7 you are in convergence adjusting mode

Aug 03, 2008 | Televison & Video

1 Answer

Blue Convergence


Hello All Above,
Your one and only problem is a bad convergence Amp board. Changing it will fix your set. You can contact http://www.interactiverepair.com for step by step assistant with installation of this board.
List price $100
Part Number: BP95-00142P
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Best regards
circuitcity

Mar 11, 2008 | Samsung HCN653W 65" Rear Projection...

2 Answers

Toshiba 56H80 Convergence Problem?


There are 2 large IC's in your set and one of them has burned out. These are called convergence output IC's and are usually the STK392-010's. A good idea would be to go ahead and replace both with the newer, upgraded STK392-150 IC's. A good tech can change those IC's in about an hour and a half, and when I do a housecall for a set like that I charge $150, but shops in your area will vary so be sure to ask around.

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