Question about Philips Magnavox 51MP392H Rear Projection Television

2 Answers

Blurry.....convergence problem??? l would like to correct my last post..... l get the green bow on the bottom like a 4 inch bow..and then about a 4 inch blue bow......on top of that... l do get a picture but the blues and reds ..and greens dont come toether...l see triple words of red and blue...and yellow/green....l tried to adjust my convergence with the arrow guides and it dont make a differnce...l was told by someone that it could be the convergence board is out...but l dont know....over picture then looks fuzzy and out of focus,,but l can still watch it..just seems out of focus.. like blue, red, and yellow/green coma type images.....anyway is a convergence board easy enough to change myself if that is the problem.... thanks.....

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  • brandie_whit Nov 02, 2008

    ... would that be the same solution that l was given before.....

  • fjjj Nov 04, 2008

    I have the 3 color effect going. Don't have the Bowing described in similar threads. I downloaded the svc manual from ServiceManuals.com , as you suggested. I've replaced IC's in school, but we had cut the legs and yanked them out for quicker repair. I was given this TV and the owner told me that they had had the convergence board replaced before, but that could have just been what they told him. I just need to know where the board is (placement wise) and where on the board these 2 IC's are. I am curious about the 120 or 150 variants. I also thought I read a thread describing a 180 variant of the chip.

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I agree with Shuttle83,

except with point #4 and #8,

#4 If you buy OEM Sanyo IC Convergence chips ruff looking black with rounded corners and up them to the next one up they will last longer. if you buy generic shiny smooth black with sharp corners they may only last 5 months. remember you get what you pay for the OEM's are usally $12-15 each, generics are $7-12

#8 you should reset to the factory settings after replacing the Convergence ships before trying to adjust again.

good luck!

Posted on Nov 03, 2008

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Hello,


This denotes a convergence problem as you surmised. Believe it or not it would be cheaper for you to replace the two convergence amplifiers and the biasing resistors. You would not actually be replacing the convergence board since these devices are usually located on the deflection board in most cases. However in answer to your question, the boards are easily removed, depending on your level of patience (lots of cables to move around), I would also advise you to either mark down all of the connection you will remove, or take pictures of the board and its connectors. If you choose to just replace the Amplifiers and the biasing resistors there is a lot of information on this site on how to do so: This will get you started:

1) Unplug the TV and then get a schematic of the TV I use http://www.servicemanuals.net or http://www.manualsparadise.com
2) On the schematic locate the STK392-xxx series IC packs (usually attached to a large heat sink)
3) determine if the STK392s are 110, 120 or 150.
4) if the STK392-xxx's are 110s replace with 110s (forget that upgrade stuff it is a hit or miss game that I don't believe you want to get into), if they are 120s replace with 120s and so on.
5)Now to replace the STKs: remove the module from the TV and unsolder theold STKs along with the bias resistors, and replace them with the newones (be sure to apply heat sink paste to the STKs when attaching themto the heatsink)
6) make sure there are no short circuits form your soldering job.
7) Reinstall the module and then turn on the TV.
8) do an auto-convergence test and then things should be back to normal.

Now if you think you can do this have at it, if not I would suggest that you have it done by a qualified TV technician.

Posted on Nov 02, 2008

  • Henry McKelvey
    Henry McKelvey Dec 04, 2008

    Hello flll,

    I can tell you what to look for as far as the convergence ICs. Look a large heat sink, with two STK type Amplifier ICs on it you can not miss it because the look like the ICs you use to find on stereo power amplifiers. Look for two black or blue rectangular (with the corners cut off) looking components with 18 pins each and those are your convergence amplifier ICs. The board to which they are attached with be the deflection board. It is usually located on the right side of the TV looking from the rear.

    I hope this helps,

    Shuttle83
    http://www.electron-age-technologies-llc...


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