Hitachi 50UX57B 50 in. Rear Projection Television
Problem for Hitachi 50UX57B 50 in. Rear Projection Television

Strange Image Flubbering/Convergence Problem, Flutters From Dark Picture To Light Picture.




By Litherish on Nov 30, 2006

" "
I recently picked up this 50" Toshiba RPTV free from a friend who upgraded to a big plasma, and didn't want to try and mess with this one.

One symptom I've noticed is that the screen will go from being normal brightness to suddenly much darker. I have attempted to re-converge the image with the convergence board I unscrewed off the front of the TV. Although when I attempt to align the colors, it will sometimes be fine, normal colors, normal brightness, and I can get the picture relatively converged, but then one of the colors seems to flubber around. It then seems to switch from normal brightness to darker brightness and the convergence is completely different from what I was just converging.

I haven't done anything other then tool around with the convergence board, and I gave it a well needed dusting.

Thanks for any help,
~Trevor
Comments:

Dec 05, 2006

- To sum up the above. The convergence does NOT stay. I forgot to mention that my specific model # is 50UX7K, manufactured in 1991.

Anyone help greatly appreciated,

Thanks much,

~Trevor

Dec 09, 2006

- Thanks for the help, I'll replace the STKs and see if it helps!

->Oh yeah, the RPTV is a HITACHI, NOT a Toshiba, which I mistakenly typed above!

Dec 09, 2006

- I ordered replacement parts for all 4 of the STKs, they should come in a few days.

Can you explain a little bit more what a Hyper Module is? And where I might find it? I've looked through the service manuals PDF but haven't found it yet. Does it have a different alternative name?

Thanks!

Best Solution

posted on Dec 09, 2006
Helpful)

beldar

Rank: Wiz 
Rating: 80%, 136 votes
you "tooled around with the convergence board"
well this chassis has several problems
if the convergence doesnt hold replace both stks
resolder around that area per tosh tech bulletin
the bright problem is probably the hyper module
all toshs should be checked with toshiba website to see if they were part of the recalls for power supply caps
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