Question about Philips Magnavox 51MP392H Rear Projection Television

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I just changed the convergence ic's. picture is almost right, but i cant quite get the final color adjustment. pic is a little light.

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  • jgbosmith May 09, 2010

    yes, i changed all 12 resistors, but never heard of a Pico fuse

  • jgbosmith May 09, 2010

    ok, thanks, i did buy a convergence kit for my tv. i am still making adjustments and it is looking better.the kit came with two ic's and 12 resistors of which i did install all of them. thanks for the help.



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U check all the resistors,and the Pico fuse,change them.

Posted on May 08, 2010

  • Chi Chu May 09, 2010

    U buy this in a form of a convergence kit.Ur Sony probally don't have a Pico fuse.It a fuse look like in form of a resistor but no colors bands.It a one solid color come in green or blue in a form of a resistor.



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I cant line the red and green crosses up left and right but i can move them up and down. I have two pics in diferent colors

The tv have a convergence problems,it is dead.Tv have colors lines like R,G,B mis alignments,have colors pictures shadows or 3D pictures look alike?Yes,than the tv convergence board it is dead.The tv convergence board must require 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 shop will cost u like $300-350 for parts and labors.

May 09, 2011 | Philips Magnavox 51MP392H Rear Projection...


Convergence - diagnosing a convergence problem - bowed picture/rainbow...

Convergence = the joining together of the 3 colors making up the picture cd3c9b5.jpg
Here is a picture of a Convergence mis-alignment

Typical repair:
Replace both convergence ICs + any burnt up resistors + any blown fuses = repair cost $250-350 or repair it yourself for about $30 and a few hours of time. Repairing requires tools, soldering and disassembly skills.

All CRT rear projections have 3 picture tubes - red, green, and blue.
Each picture tube has an electromagnet (yoke) that pulls the beams horizontally or vertically. Therefore, there are 6 convergence amplifiers. One for each color, vertical and horizontal. Any one of these amps can fail independently, or whole sections can fail. Depending on the design of the TV, almost all use an IC (integrated circuit or "chip"). These have a part number beginning with STK (ie stk392-110 most common *see pic below) and run very hot, and fail regularly (5-8 years). Most STK designs have 3 amps per IC, giving you 2 ICs to run the convergence. Many manufacturers will have all 3 vertical amps on one, horizontal on the other. Others will have both the red amps on one, the blue on the other, and the green will be split between the two ICs.

The best way to diagnose is to enter the convergence alignment for your TV. Some TV's will have an auto alignment, others will let you adjust the colors yourself. The auto align is hard to troubleshoot because you cannot tell which will not move. If auto align does not work, you have some sort of failure or malfunction. In a manual alignment, you can see which colors will move and in which directions (vertical or horizontal). Using this deduction, you can see which amps have failed and replace accordingly. Red and Blue are typically adjustable, while green is left to factory alignment and not user adjustable. Try looking at the picture with something familiar on the screen. Try to have words or letters around the edges. You can usually see which colors are straight and where they belong, and which colors are out of place. If every color is off in both directions, this is a good indication that there is no power at all. The amps run off + and - 24 volts, and usually have 2 fuses for each power supply line. If everything is off, these fuses probably blew when one or both of the ICs shorted out. *RCA customers see below* Each convergence amp has some resistors that set up the amplifiers gain. Typically and input resistor (small like 1.5 ohm 1 watt) and a feedback resistor (larger like 150 ohm). Its quite common for the smaller value input resistors to blow out, so check them before you replace everything. They are typically right by the ICs (largest heatsinks in the tv) and most of them you can see if they're burnt up. Unhook the yokes (mark them if unmarked) and then you can OHM out the resistors to see if they are opened up. Replace any possibly bad resistors, sometimes they check good but look damaged = replace them! Some TVs will just be dead or go into shutdown. If the + or - 24volt fuses are blown, suspect the ICs and replace them both.

This is kind of tricky, as these ICs usually have 18 pins on each of them. Find all your bad parts, remove them and replace with good ones. The fuses and resistors are pretty straight forward. The ICs are harder. They are mounted to the heatsinks and depending on the make and model, they can be hard to get out. They are thermally bonded to the heatsink with heat sink compound or paste. If it is dry, replace the paste with new stuff. Make sure to get a nice, even, and thin layer on there to give a good heat transfer. The trick to the ICs is to make sure all your pins are straight before you install them. Start at one end and slowly work the IC and get each pin to pop into the hole. Once you solder in all the bad parts, the TV should be able to kick back on and run. At this point, its good to center the colors up in the customer mode. If you want to take it further, get the service manual for that TV and go into service mode and do the full re-alignment. This can backfire so get the manual or make sure you know what your doing as you might accidentally erase all the data.

*stk392-110 = the most common IC. Almost all look just like this

Convergence is a very common failure and can be repaired by someone with a little soldering know how and some time to dedicate. Its quite complex, and every make and model are different. Let me know if you have any specific questions for your product and I can help you get the job done. Remember to have patience, good luck!

*RCA typically uses no ICs, and the convergence power board blows out (older models - wood cabinet) OR a small fuse blows out because of solder connections on the flyback transformer (newer models - plastic cabinet) and just needs resoldering and a new fuse.

on Jun 01, 2010 | Televison & Video

2 Answers

The tv looks like it is in 3d. when i try to adjust the convergiance the plus signs on the left are bent

do not play with this tv replace the stk ic chips and the resistors around the stk chips ,cant miss em about 2 inches big with heat sinks on them.

Sep 11, 2010 | JVC AV-48WP30 48" Rear Projection...

1 Answer

The red and blue colors are way off i tried to converge adjust the colors no results

Ur tv have convergence problems,it dead.Any colors misaligns,3D pics,shadows pics.The tv convergence board must have it the 2 STK convergence ICS and some or all it resistors are dead,must be change to solved convergence problems.The shop will cost U $300-$350 for parts and labors.

Jun 11, 2010 | Mitsubishi WT-42315 42" TV

1 Answer


This tv have convergence problems,it dead.Red,green,blue misaligns colors,have colors shadows,3d colors pic like.All these problems are the convergence board have 2 STK convergence ICS some or all it resistors are dead.These parts must change to solved convergence problems.The shop will cost u $300-350 for parts and labors.

Jun 07, 2010 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Have a projection tv...RCA model 61830BL. Had

Hi the green cross it cant move that the reference for red and blue adjustement ;just try to put the red and blue cross over the green pattern then quit/
if that doesnt work you probly have the stk-xxx ic
who control the color alignment ,are blow/
you will have to replaced and make the convergence
check if you have an auto adjustement for that most projection tv have one...
hope that help..

Mar 28, 2010 | RCA P61830BL 61" Rear Projection...

2 Answers

Tv pic has redbluegreen images pic distorted

This is a convergence problem that can be as simple as poor solder connections at the convergence ICs or defective ICs. If you feel that you want to attempt the repair yourself, please update this with that indication and additional details and instructions will follow. The parts for this repair will run about $40-$60.


Dec 10, 2009 | Sony Grand WEGA KDP-65WS550 65" Rear...

2 Answers

Convergence lines are SLANTED. Red line is above

Your TV most likely a convergence failure. ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
Here are some photos of convergence problems.

Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.


You will need to replace the convergence chips and possibly some convergence resistors and pico fuses. Its a fairly easy DIY job or you can call in a pro. If you want to do the repair yourself check the site Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, thermal paste, email/phone support, etc.

Apr 26, 2009 | Hitachi 53FDX01B 53" Rear Projection...

1 Answer

Covergence and Bowed Picture Problem

can you adjust any color of convergence in user menu blue, or red up or down left or right. if you can make any up or down left or right adjustments on any color then the likelihood it wont be a convergence ic. it would be a output resistor. so see if you can get any movement. with it being bowed i was suspect an convergence ic.

Jan 08, 2008 | RCA P60920BL 60" Rear Projection...

7 Answers

Distorted Color and geometry of Picture

I've posted this solution several times but here goes. Try setting up the convergence through the menu by accessing the convergence setup menu. If this fails to work you have a bad digital convergence box and need a tech to replace it. About $60 to $100 fix.

Nov 03, 2005 | Panasonic PT-47WX49 47" Rear Projection...

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