Question about Pioneer SD-P50A5-K 50" Rear Projection Television

1 Answer

SD-P50A5-K convergence board replace STK392-110

My SD-P50A50-K goes to standby mode right it is turned on. After reading from this site, I decided to replace the two STK392-110 ICs in the convegence board. Now I face troble to disaeembly the convergence board. Should it be pulled from the front or from the back. It seems the 3 big lamp stand in the way in the front.

Posted by on

  • ibd168 Sep 24, 2007

    Thanks Terryfic.

    I figured out how to pull the board off and replaced the STK392-110 with STK392-180.
    The set will not go to standby immediately
    now. However, after turned on for 1 hour, it still shuts it self down and goto stanby.
    The red LED (D146) light is also turned on
    in standby mode.

    I am not sure your suggestion "Be sure to remove solder from all four reg. pins". What is "all four reg. pins"?
    As for the 4A fuse in power supply board.
    Is this labeled FU106? It seems not burnt.
    Could it be "the" reason my TV shut it self
    again?

    There are other discussions as to resolder the power supply board entirely. Is it necessary?
    Some suggest to check particular large capacitors and maybe the flyback transformaer.

  • Anonymous Mar 28, 2014

    convergence is out

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  • Master
  • 1,694 Answers

Unplug chassis from front and back,remove chassis from back.Replace Ic's w/OEM or better quality only.Be sure to remove solder from all four reg. pins and clean/resolder.Replace 4amp fuse in power supply.

Posted on Sep 24, 2007

  • Vista Electronics Sep 26, 2007

    THE REGULATOR DEVICES IN QUESTION ARE MOUNTED
    ON THE SAME HEAT SINK AS THE CONVERGENCE IC's.
    Remove original solder,clean w/alcohol & toothbrush,then resolder.ALSO,resolder any/all
    bad connects.Remember to practice visual acuity technique and above all else,do no harm.I am curious why you installed STK-392-180 in place of
    original I.C. number?

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It has color at the bottom of the screen almost halfway up. I need to know how much to fix.


Tv have colors lines R,G,B mis alignments,have colors shadows or 3D pictures?Yes?Mean ur tv have a dead convergence board to causes this problems known as a tv convergence picture problems.The tv convergence board must have to be fixed like replacing 2 STK convergence ICS and some or all of it resistors too.To fixed the tv convergence board to solved the tv convergence picture problems.The tvs shops will cost u like $300-350 for parts and labors.

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Need to help accessing convergence IC's on Pioneer SD-P5191-k


these sites should show you good examples
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
· http://www.techlore.com/blog/entry/19694/Sony-Convergence-Repair-My-Sony-TV-has-a-distorted-picture-/

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1 Answer

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difficult.. if you have no solder experence ...dont try it.. depending on your exp..ok.. as a tech thats a everyday thing.. they are two big black ic mounted on big heat sinks...with a bout 20 pins that can be difficult to get lined up. When you replaced them however ..there is a few other things to check. fuses. and output resistors. just getting the boards out can be difficult.

Dec 09, 2007 | Pioneer SD-P50A5-K 50" Rear Projection...

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Convergence


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http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html



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Oct 12, 2007 | Pioneer SD-P50A5-K 50" Rear Projection...

1 Answer

Pioneer P50A5-K goes to stand by mode


1) Pull chassis---remove power/convergence PCB==the one

with the large heatsink on it.

2) Remove solder from pins of four regulators on heatsink.

3)Clean board/pins w/ toothbrush & alcohol.

4)Re-solder, also solder both Stk's for prevent.

5)Re-assemble

Oct 10, 2007 | Pioneer SD-P50A5-K 50" Rear Projection...

2 Answers

Turns off on its own with a pop sound and is blowing a fuse


90% it is convergence board problem. Need to replace STK392-110 IC.

Sep 16, 2007 | Pioneer SD-P50A5-K 50" Rear Projection...

2 Answers

Right side convergence


A convergence IC has burned out. If I remember correctly, those Pioneer sets have one huge convergence IC, but that IC only has 5 channels in it so they use another smaller dual STK IC and one half of it is used for the 6th channel and the other half is the vertical output. Look on the convergence board, find the blue convergence jack, identify the blue horizontal channel, follow the traces and replace the IC handling the blue horizontal channel.

Aug 28, 2007 | Pioneer SD-P50A5-K 50" Rear Projection...

2 Answers

TV shuts off seconds after being turned on


This is actually a common problem with this unit and one that Pioneer is aware of... Over time the feed resistors in the convergence circuit change in value and the convergence ICs begin to fail, placing more of a load on the power supply than necessary and stressing components in the SMPS. The fix; Pioneer recommends upgrading the convergence IC's from STK392-110 to STK392-180, change all resistors in the convergence circuit that have changed in value and replace the power supply to repair the unit.

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