Question about Hitachi 51S500 51" Rear Projection HDTV-Ready Television

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HI, I have an old June 2003 Hitachi 51S500 , that i have been trying to unlock for a friend of mine , She said it just started showing one morning . am not sure what kind of lock or what it is All it says it "lock" on the screen and when i key in numerous digits it says "stop". .. it shows some kind of grids on screen. it has a hitachi remote with it . CLU 5728751 but i am noy sure if its the original remote or not If anybody has a solution to this please help , i have been trying to get this unlocked for a while now . thanks a lot

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  • ashish_obero Mar 14, 2011

    So can this be fixed, if yes, whats the approx cost that it would take ? do you think its a kind of parental lock.


    Ps. i am ready to pay a little if you can provide me with adequate solution, and if the tv starts functioning again

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  • 347 Answers

Hi this is a problem with the main board clearly

the fact that it is not allowing a code and also the fact that it is asking for a code that was never put in on the first place this shows that the main board has a fault and is causing the controll unit to send out a locked message that cant be unlocked it is not possible

solution:new main board

Posted on Mar 14, 2011

  • arron somerville Mar 14, 2011

    well it is a type of parental lock that can be usally turned off and on but the problem is it is active and stuck on also even if this was just set and forgotten replacing the board would be the only solution as nobody can unlock these

    it can be fixed and i can guarantee a new board will solve the problem here is where i buy my parts but i cant seem to find a board so you will have to look aroundhttp://www.partstore.com/Model/Hitachi Ltd/Hitachi/51S500.aspx

    also it will cost under 100 dollars prices vary for rarer items

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Hitachi 51S500 51 in.


Do not adjust any knobs as instucted in the previous thread if you TV have a convergence problem. Doing so will only make things worse. The blog does however show you how to fix other common problems with these sets.

Here are some of the most common symptoms and example photos of a convergence problem

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
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Here is a quick test....

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

Try to adjust the red and then the blue 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.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.

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Hitachi 51S500


check out ctechnicians.com and ask if its the pink screen?

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