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Crumbtrail TV Forums: TV Equipment: Projection TV Forum:
Hitachi 50UX58B convergence help, please

 
 


carolinecal
New User

Sep 13, 2004, 2:20 PM

Post #1 of 17 (6893 views)
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Hitachi 50UX58B convergence help, please Can't Post
My Hitachi 50ux58b was working just fine yesterday, then last night it suddenly looked as if all the colors were out of alignment. I did the magic focus feature, but this didn't help in the least. We got to the align center screen, but were unable to move the "+" signs. My husband has opened the front panel, but there are 6 knobs with no labels. Any suggestions? I've read other posts about adjusting the alignment with the remote, but the PIP button doesn't do anything on mine.

Any help would be greatly appreciated!!



Maxima SE
Novice

Sep 13, 2004, 3:39 PM

Post #2 of 17 (6857 views)
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Re: [carolinecal] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
Carolinecal, here's something you can try. I can't guarantee that it will fix the focus feature, but it's a start. With the front panel taken off, there is 6 unmarked knobs. The top three is to adjust the colors; the bottom three is to focus the colors. The buttons are as follows: Red, Green, Blue. That means that the button towards your left would adjust the red and the button towards your right would adjust the blue.

With that said, hit the Magic Focus button once on your TV and as the "Magic Focus" words pass by, note the focus of each color. If anyone of them is blurry, than that is the lens that is out of focus. For instance, if the red "Magic Focus" word is blurry, than what you want to try to do is on the second time you press the Magic Focus button, adjust the red focus (bottom set of knobs) knob so that the word is clear. Do this for every color and see if there is any difference.

Like I said before, this is not guaranteed to work, but it has helped me couple of times, especially with Hitachi TVs. If you find any information on fixing the focus, please let me know for I am in the process of fixing my own Hitachi TV. Thanks


carolinecal
New User

Sep 14, 2004, 9:48 AM

Post #3 of 17 (6843 views)
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Re: [Maxima SE] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
Maxima,

Thanks for the advice. We did try using the magic focus and the knobs. (They were just as you said they would be Smile). It didn't fix my immediate problem, though. There is a blue shadow about two inches off to the right of the "main image", and a yellow shadow about two inches off to the left of the image. Very frustrating, since it did seemingly happen spontaneously, with no apparent cause.

Any other advice? (Other than a $400 service call?)

Thanks!


frzninphx
Unregistered User
cdrosses@yahoo.com

Oct 20, 2004, 10:28 PM

Post #4 of 17 (6664 views)
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Re: [carolinecal] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
UnimpressedI have the exact same TV and problem! Anybody found a fix? There is a little white button on the main board(visable throught the opened front panel) that is labled "Service Only".I haven't pressed it yet ,but could this put the set into service mode? If anyone has the service manualfor this set could you scan and email me any applicable info!
Thanks


carolinecal
New User

Oct 21, 2004, 9:25 AM

Post #5 of 17 (6650 views)
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Re: [frzninphx] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
Just an update - we gave up and called the repairman. He came to our house and it cost $208.00 (including tax) to fix it. Apparently, on the convergence board, one of the fuse-things had burned out. (I know that sounds ridiculous, but I have no idea what is was actually called) You can tell by taking off the back and on the bottom right side are (at least) three small oblong plastic tubes with small wires coming out each end which connect to the board. Each one should be a color: red, blue, or green. One of mine was completely white, indicating that it had burned out. Once this burns out, according to the very helpful repairman, other parts burn out as well, if you continue to use the television.

One indicator that this has happened: previous to being fixed, on the magic focus operation, the entire phrase was never finished. It would usually stop trying to focus on the "g" in magic, and return to the main menu. I assumed it was finished, but it should complete the entire phrase "magic focus" with each color.

He also said that Hitachi in the last few years has stopped doing additional soldering on key chips and parts. The boards are dipped by machine and passed down the line. Apparently in the past actual people examined the boards before assembly and added additional solder to key parts. Sorry I couldn't help more.

Good luck!


mikemaiertv
Enthusiast


Oct 23, 2004, 6:45 PM

Post #6 of 17 (6623 views)
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Re: [carolinecal] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
As with all the post above sound as if you all have the same problem one or both Ic's have failed in the convergance curcuit replacing these Ic's ( STK392-110 usaly) cures the problem, Flash focus can not work because as the set is displaying sqares or lines and dots it is waiting for this light to hit a sencer just inside and out of view on the screen, when the Ic's fail these refrance lights are not even close to where the set needs them to be so it stops this process. And for referance the little blue switch inside on the board is for setting default values by a qualified service tech, the six "knobs " are screen and focus contols is set incorrectley this too will cause many problems from poor pix to burned crt's
Mike Owens Lead tech Maier TV Spokane Wa


dbd5000
New User

Oct 28, 2004, 11:38 PM

Post #7 of 17 (6561 views)
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Re: [mikemaiertv] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
Came upon this thread and it has some information I can use, but I need more. I have a Hitachi 50UX22BA with the typical convergence problem. Have come to the conculsion that I need to replace amps. In my case they are stk#4274. Mine are not located on the side wall as some others. I have a silver box about the size of an internal hard drive in a computer, which is labeled as "digital convergence unit". My question is this. Are my stk 4274 located inside this box instead of being stand alone? I have the circuit diagrams and have located the 4274's on the print but can not tell where they are located. Now the next question, if they are in the box (digital convergence unit) can they be replaced without replacing the entire box?

Anybody have any insight on this model? Hitachi 50UX22BA

Thanks for any input

Denny


mikemaiertv
Enthusiast


Oct 29, 2004, 10:23 AM

Post #8 of 17 (6544 views)
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Re: [dbd5000] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
The box you talk about here control the convergance it does not have the Ic's in it . what youre looking fore is some large ic's ( about 1-1/2 by 1 inch) mounted to a heat sink. there may be three of these if they are the 4247's find these and replace all of them as a set
Mike Owens Lead tech Maier TV Spokane Wa


kjones
New User

Nov 1, 2004, 11:00 AM

Post #9 of 17 (6507 views)
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Re: [mikemaiertv] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
I likely have a similar problem. However, rather than going out of convergence forever, my Hitachi 50FX18B blinks in and out (see attached photo). Mine may be fine for months and then blink out for a few seconds or hours. So far it has always gone back to normal, but I am afraid it will eventually go out for good.

Is this the same problem?
Attachments: Hitachi convergence problem.jpg (24.6 KB)


Carl
Unregistered User

Nov 14, 2004, 5:23 PM

Post #10 of 17 (6322 views)
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Re: [carolinecal] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
I recently installed a pair of STK392-110's in my Hitachi 50ux58k projection set to cure convergence problems. I'm not a repair Tech just an electronics hobbyist, but I have a few suggestions when installing these parts.
The IC’s have 18 pins and are soldered to the circuit board and held in place by a large heat sink. Remove the screws that hold the clamping bracket to the heat sink and remove the screws that hold the heat sink to the circuit board.
The IC’s have heat transfer paste between the heat sink and the IC. Gently pry the parts apart and remove the heat sink assembly. You may be able to reuse the heat transfer paste (on my original assembly there was a lot of it oozing out the sides of the IC’s).
Since you won’t be reusing the old parts just clip the leads from the top of the circuit board and heat and remove the leads from the bottom with a soldering iron and needle nose pliers. If you “wiggle” the leads a little as you pull them through the molten solder, it will leave a clean hole for easy installation.
Next, inset the new IC’s through the holes from the top making sure that they are oriented correctly. Using fine rosin core electrical solder, I start by soldering leads #1 and #18 which holds the parts in place while soldering the rest of the leads.
When both IC’s are soldered to the circuit board check for any loose or “cold” joints. Reheat them and add more solder, if necessary.
You can test the set now but, be warned; these “puppies” run hot and you can “cook” your new parts if you run them for more then a couple of minutes without the heat sink….so just put it on!
Spread a good layer of heat transfer paste on the back side of the IC’s. Replace the heat sink and IC clamp. A little of the heat transfer paste should ooze out the side assuring that all voids are filled. Improper heat sink installation will greatly shorted part life. Put your set back together assuring that the wiring is correctly separated. Turn the set on, run “Magic Focus” and if this was the problem, the set should work fine. Give yourself a “High Five”, mix a cool drink and enjoy; you’ve just saved yourself several hundred dollars in repair costs.
Oh, by the way, I bought my STK392-110’s from http://www.electronix.com/ for $4.99 each.
Good luck!
Carl


skidunk
New User

Jan 11, 2005, 10:24 PM

Post #11 of 17 (5843 views)
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Re: [Carl] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
I am having a similar problem as those above. My set was produced in 1998 so has some time in service. When I push the Magic Focus button the colors seem to come through alright and the magic focus text letters all come through. The only thing is that the M blinks but really not of the other letters. I have not messed with the color buttons behind the front panel because this "all of a sudden" problem started without provocation. That said, should I order the IC's and is it obvious where to locate them? Yes I am fairly handy (with a 67 Mustang and conventional points, ha) but I am sure I could change an IC, also should I order some of this heat sink material? Thanks a bunch.


joe1715jt
Novice

Feb 3, 2005, 9:12 PM

Post #12 of 17 (5736 views)
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Re: [mikemaiertv] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
Mike -

What is IC?
And where are these located in the back of the tv?
( STK392-110)

I'm having the exact same problem with my tv....


joe1715jt
Novice

Feb 3, 2005, 9:15 PM

Post #13 of 17 (5734 views)
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Re: [Carl] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
Carl --

Can you tell me where on the inside back of the TV these IC's are located?


mikemaiertv
Enthusiast


Feb 5, 2005, 4:49 PM

Post #14 of 17 (5710 views)
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Re: [joe1715jt] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
Well let see a couple thing going wrong in this post, first thing where you are instructed to fool withe the screen/focus control ( The little thingy with six unmarked controls ) these are used to adjust what we call grayscale, focus and beam current, they have nothing to do with convergance other than to focus the beam, messing with these will only get you a out of focus and a pix that is out wack when it comes to color, they are handy to brighten up and focus the set but that alone is another subject.
Convergance Ic's even though we mention the STK392-110's a lot because they are the most popular ones used in older sets but there are differant ones located on differant boards and could be located almost anywhere in the set, but one universal comon thing they share is that they will always be a large ic ranging from the 392-110 at 2.5"X1.5" to the big Pioneer STK4277sl which is about 4.5X2.5" in size
and they will always be mounted to a big heat sink so they can disapate heat.
Mike Owens Lead tech Maier TV Spokane Wa


Johnny K
Novice

Mar 8, 2005, 11:00 AM

Post #15 of 17 (5534 views)
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Re: [mikemaiertv] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
Hi gang, I have the same TV and the blue and green are fine, but last night the red appeared messed up, as a upward curve on the upper left side fo the screen and a dowward curve on the lower left of the screen. Is this close to the symptoms you've seen?? When I use the Magic Focus, it goes through the "M" and then gives a "3" in the lower right hand side,, can't find anywhere the error code chart. Please let me know!! johnk@nls.net


Johnny K
Novice

Mar 10, 2005, 11:24 AM

Post #16 of 17 (5507 views)
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Re: [Johnny K] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
Here's a follow up: See more details on the fixing of my tv at:

http://www.tv-forums.com/...lower_curves_P12555/



Thanks,



Johnny K


Johnny K
Novice

Mar 11, 2005, 10:48 AM

Post #17 of 17 (5492 views)
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Re: [Johnny K] Hitachi 50UX58B convergence help, please [In reply to] Can't Post
Here's the fix update:

Replaced 2 STK392-110's, the RK46 Resistor that was fried (2.2 ohm) and ran Magic Focus and all fixed!!

Life is good.

Take care,

Johnny K

 
 
 


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