Question about Pioneer SD-533HD5 53" Rear Projection HDTV

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STK chips didn't fix my problem

I was having the problem that many on this site have listed where TV would shut itself off and come back on without me doing anything to it. It usually only occurred in the morning after the set had been off all night. The shut-offs were interspursed with flickering picture sort of like when a computer monitor resyncs after resolution changes are made. After it warmed up for 20-30 minutes all the problems would go away.
This went on for several weeks, then one day it wouldn't come back on. Found info on this site that it was likely a blown fuse. Sure enough, replaced the 4A fuse on the middle board and worked fine. But it continued to have problems and I went through three more fuses within two or three weeks. I started leaving the TV on all the time, and only turning off the cable box. This prevented any of the problems from coming back but used a lot of unnecessary electricity.
Once again, based on info on this site I ordered and replaced my chips with STK 392-180 chips. Genuine Sanyo chips from electronic parts kits.
After replacement, the same problems appeared.
So after more reading I suspected cold solder joints. I reheated most of the solder connections on the right hand board that the STK chips are on as well as the larger and high temperature areas on the middle board. However, I didn't remove the old solder and most looked very dull and didn't flow well. On a few leads I added a very small amount of new solder and got much better results with solder flow.
But once again the problem still exists. Appears to be heat related, but opposite of most heat related problems because this one only appears when the TV is cold and then goes away as long as the TV stays warmed up.

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  • Allen May 24, 2008

    On a couple of mornings after my recent repair attempts I notice that when first turned on from being off all night the picture had a "washed out" greenish yellow hue to everything. Not sure if this is absence of one color or overdriving of another. The washed out condition goes away within a minute or two and then the condition described above starts up.

    I also noticed that upper left corner starts to lose convergence right before the "resync" condition where the picture blanks out and then comes back on. One of the colors starts to bend down slightly like a droopy eyelid. It's such a small area that I didn't notice until there was some text in that corner.

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  • 4,234 Answers

You probably have a bad cap in the horizontal sync circuit. I'll check with mhy Pioneer contact for more details. Stay tuned...

Dan

Posted on May 23, 2008

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My Mitsubishi tv vs70707 convergence problems. I just replaced my 2 STK convergence chips, and double check my soldering. Still have 3d pictures and can't find pico fuses. Glass fuses are ok.


Need a better picture, but usually fuses are listed as F(number) and would be on the power input to the STK chips. The resistors should be checked as well.

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Use this simple test to verify.
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If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section.
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http://www.fixya.com/support/t1684874-screen_blue_green_green_red_outlines

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Philips tv



Sounds like your convergence chips are shorted which would make the set shut down. Its also possible that the flyback has failed but because the first symptom was the 3d look I would start with the convergence repair.

Here are some of the most common symptoms. 

Screen looks 3D
One or more colors can't be adjusted when using the convergence menu. 
Screen is bowed in but stationary.
No audio or video - typicaly occurs after having the distorted color problems listed above. 


Solution: 
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Hope this helps,
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Stk divergent chips


That series usually used the STK 392-110.

It has been upgraded to the STK 392-180. 2 of them.


Mr Bob
www.imageperfection.com

May 11, 2008 | Pioneer SD-533HD5 53" Rear Projection HDTV

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