Question about Toshiba 55H70 55" Rear Projection Television

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The colors / pictures are all distorted, I am capable of testing/soldering / but I dont know where to start, there are alot of boards/components, was intimidated.

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  • robertdemoss Jun 07, 2010

    I removed the 2 convergence chips-found 2 new ones locally for 6 bucks each-soldered everything back in and TV works awesome !!!!!!

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  • Master
  • 505 Answers

This is convergence. you can bang on the heatsinks and if it snaps back into alignment, you just need to solder. look for the large heatsinks.. 2 of them, 1 for each chip. there will be chips on them labeled stk392-110
if banging on it doesn't snap it out, you will likely have to replace these chips.. lots of soldering

Posted on Jun 01, 2010

Testimonial: "I wasnt sure where to start-with his advice I now know to look for the chips under the heatsinks."

  • thielectronick
    thielectronick Jun 03, 2010

    For more help, check my convergence tutorial.

    http://www.fixya.com/support/r5001731-co...

  • james raps Jun 14, 2013

    what does heatsinks look like

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1 Answer

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Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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How do I know which part to replace in my LCD TV...is it the backlight or t-con or main board?


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.

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Got it new at Walmart in 2006? Never had any problems with it, and always had a surge protector. I know the kids have abused it though. Anyway, yesterday they had a pink, washed screen, turned it off/on...


No.The tv video board have dead components,that the board where it is connected to the CRT-(tv picture tube).Troubleshooting that video board and changes parts should fix ur tv problems.Hope ur tv problems,it is not the video board main big IC colors processor inverter.This big IC is a pain to change and probally not in the market anymore.Troubleshoot test all the capacitors around that big IC colors processor inverter alot of times just those few capacitors are dead only.

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My Samsung T4665F has a start up problem. Initially Relays click then eventually it starts up but with colored pixels over the whole screen. Then I have to switch off/on one more time and the pixels go...


This tv 100% have power supply board problems and might also have the T-CON decoders board problems too.The power supply board,that the board,where the power a/c cord plug into it.The T-CON decoders board,that the board sit wright in the middle bottom of the LCD screen panel.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.Replaced the power supply board,should get ur tv power up right away and work,no more series of clickings noises.But,if the tv still have alots colored pixels lines on the screen.The T-CON decoders board it also dead.Replaced the T-CON decoders board too.

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3 Answers

Samsung tv HLN507W. Started out 6 months ago making a humming noice. Now it the screen freezes and goes black and white and the 3 buttons in the front are blinking. We turn it off and it will work for a...


I think you have a colorwheel with bearings that are noisy and theres no telling how long it will last . Could be days or years, just noisy. But a colorwheel will not cause a picture to freeze. Sounds like two problems- a questionable colorwheel and a failing dmd board .
Most likely your problem is on the DMD Assy Board P/N BP96-00249A . More presicely there is a few bad electronic components on that board that are bad. That board can be repaired by replacing the bad components (and the other few compoonents that are probly going bad and will soon cause your tv to lockup and lose remote and button functions when it fails so you will need to unplug it to get it on again).
Or the DMD board can be replaced .But it is not a cheap board.
For removal and Installation of the DMD board I would reccomend a tv service person because it is in the heart of the television and there are some adjustements to be made when the new board is installed.
To get the new board you could probably find it by just gooogling the part number.
Component level repair would require some experience in desoldering and soldering SMT,SMD , and or surface mount components.The actual components are about $15.00 total so just repairing your board should cost about $125.00 by a qualified servicer (if you were to remove and install it yourself). This DMD board is used in many models and can has few common problems.
HLM437W HLM4365W HLM5065W HLM507W HLM617W HLN437W HLN4365W HLN467W HLN507W HLN50665W HLN567W HLN617W ( L2 and L5 chassis )
SYMPTOMS:
-Intermittant picture freezing with a negative looking B/W frozen picture.
-Intermittant loss of pic with/without shutdown
-abnormal color wheel noise if attempted to start right after shutdown.
-lockup of tv control functions . Remote and front keypad do nothing , TV must be unplugged to reset .
-horizantal tearing, distortion , flippnig , solarization , red picture, leading to blank screen and lockup.(tv menu would be affected by all picture defects if caused by DMD board).
Hope this helps someone..

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2 Answers

Must have blown something...all of a sudden after 9 yrs of use...picture is distorted. seems to arch toward the middle and mostly red and blue. Can watch it but very very distorted. sup?


I had the same kind of problem with a projection tv I had it was as simple as removing the front panel to expose the lightbulbs where there are 6 screws two for each color one for focus and one for power if after adjusting theese and going into the setup and adjust the color calibration it still does not work you want to make sure the three light bulbs on the bottom are alll working as missing one light can cause tints and the distortion your talking about

Mar 30, 2010 | Sony KP-53HS30 53" Rear Projection...

1 Answer

51" sony projection with distorted pic and color


The convergence amplifiers are likely blown.
Fairly easy fix if you are good at soldering.
Search this site for convergence repair.
Dan

Sep 09, 2009 | Sony KP-51HW40 51" Rear Projection...

1 Answer

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1 Answer

Picture Fades


It isn't clear if the picture just loses color or the screen goes blank. If you are just losing color (picture goes to B/W) there is a problem in the color circuit and from your description it could easily be a bad solder connection on the board which decodes the color portion of the picture. If you are capable with a soldering iron and know TV HV safety, unplug the set, and remove the circuit boards and inspect (with a high powered magnifier)and resolder all suspect looking connections on the boards. You could also resolder all the connections which is more work but assures that solder joints are not the problem. If your problem is not solved at this point you are probably going to need a technician to look at it as it could be just about anything and probably would be beyond your expertise. Good luck and be safe.

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