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What convergence ic's are used in the Pioneer pro 99?

Was it the single stk 4277?

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  • Robert Jones
    Robert Jones Dec 22, 2012

    Thanks very much for your assistance gentlemen. Great info here. The owner wrote in and ID'd the chips as the STK 392-560s. They have since been upgraded by the 392-570s, which are 3 channels each. There are occasionally 6 channel ICs where the entire workload can be done by 1 IC, like the previously mentioned 4277 and the 393-110. I would be very wary of ever changing out the convergence board for a repair like this, as chances are the eeprom containing all the convergence registers you set uses will be mounted on that board. Starting from scratch is never easy, and if you change out a board with the eeproms on it, you have to start completely over. Tho I can do it, it's never my first choice, as tons of extra work is then required. Mr Bob

  • Robert Jones
    Robert Jones Dec 22, 2012

    SD Tech: Not all CRT RPTVs use 2 chips. Some use only 1. They all do use 6 channels tho. The STK 392-110s have been upgraded at least 4 generations since they were used as factory issue 12 years ago. The 392-180 is the one I use these days, I would never put in a 110 again, now that it has been eclipsed by its newer stronger and much more recent replacements.

  • SD Tech
    SD Tech Dec 23, 2012

    having replaced over 1000 convergence chips I would disagree, higher current etc does not justify or explain one fact, most of the chips in additon fail for a much simpler reason, the heat transfer mateial or grease as some call it dries out and a device reaches a point where the material actually inhibits the transfer of heat, yes the old Hitachi sets that used 3 individual chips almost never failed but were working much less. , as far as the 110 goes put two in a set properly and put two in another set , the higher current rated ones and play them for years, I bet either will last about the same amount of time depending not so much on current ratings etc but how fast the heat sink compound becomes dry and like old paint on your house. Those chips do not get baked onto the heat sink for no reason.

  • Robert Jones
    Robert Jones Dec 23, 2012

    oh I grant you they get super hot and would not survive at all without the heat sink and its compound achieving sufficient heat transfer. I had not thought about it from that perspective and grant you your point on that. When I describe how to do this job I recommend using a putty knife to get any dried-on heat sink compound offa there. However when it comes to improvements - and I have no idea what the actual upgrades were - I always try to stick to the more improved versions of ICs esp. when it's 12 years after the originals were factory issue.


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I doubt that, most use the stk-392-110 but the part number will be right on both chips, it should use two chips.

Posted on Dec 22, 2012

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Posted on Jan 02, 2017

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SOURCE: convergence problem

That unit has a convergence repair kit that should fix most problems. Order it directly from Hitachi p/n# X480295. It contains: Rk42 3.3 Ohm 1w Rk46 1.8 Ohm 1w Rk50 3.3 Ohm 1w Rk54 1.8 Ohm 1w Rk58 3.9 Ohm 1w Rk62 2.2 Ohm 1w Ik04 Stk392-150 Ik05 Stk392-150 And I would strongly recommend testing all the resistors in that circuit for change in value. Are you using a good heat sink compound on the STK's when you installed them? That and ordering the japanese knock-offs for STK's are the two most common critical mistakes made. Originally that unit had two STK392-110's for conv. amps. Even Hitachi recommends subbing to a STK392-150 or 180 for greater reliability. You do realize that for the cost you have after two failed attempts you probably could have taken this to a reputable shop and watching the ball games now. :) (no disrespect intended) Good Luck! Bill

Posted on Jun 01, 2007

SOURCE: convergence ic's


Posted on Dec 26, 2007

  • 206 Answers

SOURCE: Replaced STK ICs but image is all distorted

Usaly when this happens the little fuses also fry they are 5 amp and located neer the ic's and at the bottom right of each ic, also they are green and look like a restor could check and see if they are open and then check all the big resistor to see if any of those show open, other than that I will paste my standard fix for this set
Everybody here seems to have basically the same problem so I will write a general fix for these Samsungs. First what you got is known as Convergence failure, A Ic or resistor, fuse or some other component has failed in the convergence circuit. So finding the service menu and trying to align the colors or spinning magnets on the CRT’s or a real bad idea of tipping a CRT or mirror would be the equitant of ripping the transmission out of your car because it had a flat tire. When the convergence fails no adjustment will bring it back, and if you do one of these stupid things then you have two problems. Now most of these Samsungs have an easily replicable board that all the convergence amplifiers are on. This can be found by removing the back and seeing if there is a board about 9 X 5 inches big and mounted to the CRT mounts, there will be 5 connector to this board. Now if your set does not have this board and instead has the two convergence Ic’s (these are about the size of a playing card and have the numbers STK392-040 on them) mount down on a board below and to the right ( this is known as the deflection board) this repair will not work for you. Instead you will need to component level repair the convergence circuit. But if you do have this separate convergence board the repair is fairly straight forward. Go to or some other supplier and order BP95-00142E this is the convergence board. This board has been crossed several times through the years but this is the current version. Now once you get this board simply replace it making sure to get al the connector back in there original spot. The fire up the set and run Flash focus and for about 95% this will fix the set

Posted on Feb 13, 2008

  • 8617 Answers

SOURCE: D52W26 Convergence board

Yes the D52W20 and the D52w26 are both ITC222 chassis they are exactly the same

Posted on Jul 17, 2008

  • 899 Answers

SOURCE: won,t turn on.

FOUR Blinks---No Vert. Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. check the vertical deflection IC and circuit

Posted on Nov 05, 2008

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1 Answer

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