Question about Projection Televisions

2 Answers

Okay, I removed the circuit board with ease and was ready to operate and all the sudden I was stuck. The stk is attached to what looks to be a mine radiator and I have no access to clip the bottom of the stk due to resistors being in the way. Where to from here?

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  • scottmallory Mar 28, 2008

    little confused. should I remove the mini radiator attached to board with the desoldering iron and then proceed to stk removal? desoldering iron simply removes the solder vs. melting new?

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2 Answers

The way my board is set up the screw driver would have to be less than 3 inches long as power unit wall is so close. lastly there are many resistors obstructing clear path to ic pins. I am confused as I have not seen anyone else with this issue.

Posted on Mar 28, 2008

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  • Projection T... Master
  • 8,617 Answers

Use solder wick or a desoldering iron from radio shack which will **** up the solder so you easially remove the IC. Radio shack has a in-expensive desoldering iron with a rubber bulb which makes this easy.

Posted on Mar 28, 2008

  • Sonny Berry
    Sonny Berry Mar 28, 2008

    no just remove the solder from the ic pins then just remove the clip or screws from the ic to the heatsink

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1 Answer

Just don't know with this one - Guess, shoddy ghosty 3D images,side way hour glass.


2004 or there abouts, Rear projection with the 3 picture tubes--16X9 HD ready.

Most common issue is convergence--see photos--if that with the Original remote go into the main menu and call up convergence--should display about 9 points on the screen with crosses---remote should (look at owner manual) allow you to try to adjust so you have yellow crosses with no red or blue or very little showing--if adjusts you are ok.


If will not adjust in some area up/down or left right the convergence circuit needs repair--should use two stk-392-040 or -020 chips--on this smaller set usually on a board inside above the main boards--

See if will adjust first (universal will not work for that) and let me know..



4_8_2012_5_29_38_pm.jpg


4_8_2012_5_30_12_pm.jpg



4_8_2012_5_30_46_pm.jpg
typical ic used, your will have a different stk number on it.

Apr 08, 2012 | Projection Televisions

2 Answers

Our tv is showing double images.


if your set looks anything like the attached photos I can tell you what is involved in repairing it.

Before you rate this information let me know if pictures look anything like your problem.

SD TECH


sd_tech_69.jpg



sd_tech_70.jpg


sd_tech_71.jpg

Jul 28, 2011 | JVC AV-56P575 56" Rear Projection...

1 Answer

Getting a double picture on a 52 inch hd tv


LOOK at attached photos and if they look anything like yours you have a convergence problem.

Most of the Philips sets use either 2 of the STK-392-120 OR a few use the STK-392-110 (NOT INTERCHANGEABLE PARTS).

WITH SET unplugged and back cover removed they will be on far left board on side by side metal plates with fins (heat sinks).

Set will need to have chassis in "service position" to replace them and I can tell you how.

TOTAL PARTS COST IF PURCHASED ON EBAY will be under 25 dollars total.

If the photos or this information helped you rate this solution as very helpful as I do this here for free.

I can assist you with this repair and most can do it themselves.

SD TECH


6a12fe1.jpg


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Aug 23, 2010 | Philips 55PP9363 55" Rear Projection...

1 Answer

60IN PHILIPS


Time to fix it !!. Replace two Ic's Stk 392-110, and get in service menu settings , and adjust point by point. After replaced stk IC's, check if any resistor look brown or born, if yes, replaced it with 6.8 Ohms.SOme time SSB is defective ( small signal board, replaced it ) If you have questions? noetvs@embarqmail.com . Good Luck !!

Jul 13, 2008 | Philips 60PP9202 60" Rear Projection...

1 Answer

56" jvc projection


You need to re-solder the circuit board that contains the STK convergence modules. They're on the center circuit board attached to an aluminum heat sink that's about 8" long and 6" tall, about dead center in the circuit board. You may be able to recreate the problem (hour glass effect) by gently moving the heat sink (which the modules are connected to). This gives the hour glass effect on the picture and the advanced convergence screen. This is an indication that the modules pins aren't solidly connected (meaning soldered) properly. Remove the circuit board and clean the old solder off & resolder the modules pins to the circuit board reconnected the board and then retest by again pushing on the heat sink. This is a caused by a minimum effort (a.k.a. minimum cost) solder job, probably done in some 3rd world sweat shop. The "factory" job was good enough for 3-4 years but the heat (and these modules do create a lot of heat) and stress created from repeated use eventually takes it's toll, weakens the pin connections and our problem occurs. take the appropriate cautions working around the high voltage of the set & use a non-conduting piece of wood to push the heat sink when we doing tests. Best of luck, hope ya fix it.

Jan 31, 2008 | JVC AV-56WP74 56" Rear Projection...

1 Answer

Can't adjust blue lines on grid for convergance


I would take a look at the entire circuit board the STK chips are sitting on... I have the same problem with a sony KP-57wv700 and it turned out to be the high voltage controller for the crts got fried... part # BA9759F and it can not be replaced as the entire circuitry around it got toasted also... I just ordered entire circuit board. mine was the D board in this case...

BTW, did you check or replace the pico fuses? 3 orange ones on each STK circuitry. Check their resistance with an ohm gage should show continuity. My case they were 3.15 A each...

Jan 14, 2008 | Samsung HC-P4752W 47" Rear Projection...

1 Answer

Vertical lines only


You need to re-solder the circuit board that contains the STK convergence modules. They're on the center circuit board attached to an aluminum heat sink that's about 8" long and 6" tall, about dead center in the circuit board. You may be able to recreate the problem (hour glass effect) by gently moving the heat sink (which the modules are connected to). This gives the hour glass effect on the picture and the advanced convergence screen. This is an indication that the modules pins aren't solidly connected (meaning soldered) properly. Remove the circuit board and clean the old solder off & resolder the modules pins to the circuit board reconnected the board and then retest by again pushing on the heat sink. This is a caused by a minimum effort (a.k.a. minimum cost) solder job, probably done in some 3rd world sweat shop. The "factory" job was good enough for 3-4 years but the heat (and these modules do create a lot of heat) and stress created from repeated use eventually takes it's toll, weakens the pin connections and our problem occurs. take the appropriate cautions working around the high voltage of the set & use a non-conduting piece of wood to push the heat sink when we doing tests.
Best of luck, hope ya fix it.

Jan 07, 2008 | Apex Digital GB5108 51" Rear Projection...

1 Answer

RCA projection tv Model # P52927


You need to re-solder the circuit board that contains the STK convergence modules. They're on the center circuit board attached to an aluminum heat sink that's about 8" long and 6" tall, about dead center in the circuit board. You may be able to recreate the problem (hour glass effect) by gently moving the heat sink (which the modules are connected to). This gives the hour glass effect on the picture and the advanced convergence screen. This is an indication that the modules pins aren't solidly connected (meaning soldered) properly. Remove the circuit board and clean the old solder off & resolder the modules pins to the circuit board reconnected the board and then retest by again pushing on the heat sink. This is a caused by a minimum effort (a.k.a. minimum cost) solder job, probably done in some 3rd world sweat shop. The "factory" job was good enough for 3-4 years but the heat (and these modules do create a lot of heat) and stress created from repeated use eventually takes it's toll, weakens the pin connections and our problem occurs. take the appropriate cautions working around the high voltage of the set & use a non-conduting piece of wood to push the heat sink when we doing tests. Best of luck, hope ya fix it.

Jan 03, 2008 | RCA P52939 52" Rear Projection Television

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