Question about Hitachi 51F500 51" Rear Projection HDTV-Ready Television

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Magic focus put new deflection board, magic focus does not work

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  • andrew410 Dec 13, 2007

    bill the old board was damaged... magic focus does not launch at all



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That's a DP23 chassis, why replace the deflection board? Does magic focus come on the screen? Does it just no converge the picture? If so, it's likely that the convergence amps have failed.
That unit takes two STK392-110 Sanyo built Ics at board position Ic04 & Ic05. If you replace them I'd upgrade to the STK392-150's for greater reliability.

Posted on Dec 13, 2007


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Blurred picture, colors not aligning.

Hello mekysor,

You have a convergence amplifier problem. This is a common problem in these types of televisions. The fix for this problem is to replace the two convergence amplifiers in your tv. These amplifiers usually go bad along with the associated bias resistors. I would suggest that if you are going to do this yourself you should use only the manufacture recommended replacement parts. There are many who will tell you to upgrade the amplifiers, but my experiences have told me this is more trouble then it is worth, if you don't plan on redesigning the circuit itself. So with that being said, here is the basic procedure:

1) Get a schematic for your set (to be used in parts location and alignment instruction)

2) Using the Schematic locate the STK329-xxx or STK392-xxx series amplifiers (They are the two large six sided components attached to a large heat sink on the deflection board)

3) unplug the TV set

4) remove the deflection board from the TV set

5) using a soldering gun or iron with either a de-soldering pump or de-soldering braid remove the solder from the pins of the amplifiers and the associative biasing resistors.

6) remove the amplifiers from the heat sink and clean the heat sink off with alcohol or a solvent designed for removing the silicon paste.

7) coat the metal plate of the new amplifiers with heat sink paste and install them on to the heat sink.

8) install the associative biasing resistors

9) solder all of the components, making sure not to create solder bridges (short circuits) on the printed circuit board.

10) inspect the soldering job for bridges and cold solder joints (touching the joins up if they are cold)

11) reinstall the board to the television (reconnecting all cables removed.

12) power up the TV and perform the alignment instructions in the schematic

13) set the alignment of the TV

14) perform the magic focus setup

This should complete this task.

Now if you feel that you can not do these tasks, please consult a qualified TV technician about doing this for you.

I hope this helps

Thank you,


Jan 17, 2009 | Hitachi 53UWX10B 53" Rear Projection...

1 Answer

Thin red line down the middle of screen

Enter muye 1 / 8 /3
it puts you into convergence mode and clears out all bad magic foces data.
then run perfect focus to save new data.

hope this helps

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Picture is squished in on all 4 side of TV and colors are all dis

You will not find the problem in deflection board it will go back to convergence board,I repaired one that would not Magic focus cause was on connectors from power board to convergence board the one closes to up front of board one of the pinns was bent under so when i pluged it back in did not know after lifting up connector under tiny pins 1 of them was bend under straighten it so it could plug in right Fixed problem.

Dec 17, 2008 | Samsung HCN529W 52" Rear Projection...

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Hitachi 53UDX10B Magic focus won't focus the green


I posted this some time ago, but it is useful to your problem so here it goes:

It sounds like you convergence amplifiers are about to malfunction. If possible can you post a picture of what is happening. Again by the description you gave it sounds like the convergence amplifiers.

If you go to a shop the cost will about $400 - $500 (includes parts and labor).
If you do it yourself the cost will be about $25.00 - $50.00 (includes parts labor is free)

If you choose to do this yourself, here are the basic instructions:
1. Unplug the TV set
2. Take the rear bottom panel off
3. look for a large heat sink with two large black ICs (STK392-110) (6 sided components but rectangular in shape) on it, and remove the board the ICs are on from the TV set.
4. Unsolder the components using a soldering iron and a suction solder remover.
5. disconnect the components (ICs) from the heat sink
6. Unsolder all of the bias resistors and replace them with the proper values (usually 220, 150, 3.3, 2.2, and 3.9 ohms)
7. install the new ICs (STK392-110)
8. solder all connections IC and bias resistors
9. Inspect for shorts
10. reinstall circuit board
11. Plug the TV set in and turn it on.

Remember to check the deflection circuits also

I hope this helps

Thank you,


Sep 20, 2008 | Hitachi 53UDX10B 53" Rear Projection...

2 Answers

Magic Focus does not work.

Convergence issues usually resolved by changing convergence output amplifier IC's.....Original STK392-110 should be replaced
with upgrade Stk394-160E Hitachi part # CZ 01341,change both
for reliability.....check B+ feed resistors for over-heating....T.

Feb 04, 2008 | Hitachi 43UWX10B 43" Rear Projection...

1 Answer

Hitachi 51f500 magic focus

convergance amp ic bad


Dec 12, 2007 | Hitachi 51F500 51" Rear Projection...

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