Question about Philips Magnavox 51MP392H Rear Projection Television

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Magnavox 51MP392H Convergence Amps

Hi All,

I have a convergence problem with the subject TV. I changed the convergence amps and even changed two resistors that appeared to be burned (although they tested good once out of the circuit) but there is still a convergence problem.

Prior to changing the amps I believe the green convergence was out (curved up in the corners at the top and up in the middle at the bottom). I didn't fix it right away and then one day when I turned the set on the power started rapidly cycling off and on. I had to unplug the TV to get it to stop. I figured one of the amps or a resistor shorted and was causing an overcurrent, so I went ahead and changed the amps. Now, after changing the amps, both the green and blue convergence are out (green is flared out on the left and blue is flared out on the right).

The convergence went out once before on this TV and I replaced the convergence amps following the instructions from a FixYa post and it worked fine. That time I used what I thought were original Sanyo STK392-120s (they lasted less than 1 year, so maybe they were actually generic). One difference this time is that I used STK392-180s because I read that they are a drop in replacement but are more robust. I'm wondering if that could be the problem. Any help would be appreciated.

Thanks,
Rich

Posted by on

  • schwartz_r Jan 17, 2009

    Thanks for the suggestion, but all is well now. I took the board back out and scraped all of the flux from around the solder joints on the board with an exacto knife, put everything back together and viola! I just finished it up and it works like a charm (and just in time for the Steelers' playoff game)! There were no solder bridges, but there must have been some contaminants in the flux.



    Now on to the next job - changing the coolant in the guns.



    Thanks,

    Rich

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I always stick with the OEM stk #'s - for one..... also it sounds like you may have some damaged resistors in the convergence section. Pull one leg of each resistor and measure the impedance of each one to make sure they are in spec.

If you need a service manual, go to techlore.com , click the Resources tab, then click technicians corner. You will be ale to click "see all downloads" and look for the magnavox 52mp392h/17,

or you can try this link:

http://www.techlore.com/group/2/list_downloads

hope all this information helps!

Posted on Jan 17, 2009

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The tv have a problems known as a convergence problems,it is dead.Tv have colors R,G,B lines misalignments,have colors shadow picture or 3D picture look alike?Yes,the tv convergence board it is dead.Must be repair by replacing like 2 STK convergence ICS and some or all of it resistors too on the tv convergence board.To fixed the tv convergence board to solved the tv convergence picture problems.The tv shop will cost u like $300-$350 for parts and labors.

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jj,
The convergence amps have most likely failed. This is the number one leading cause for the symptom your describing and the most common failure on that unit.
Your Tv take two STK392-120 Sanyo Ics for convergence amps, located at Ic7404 and Ic7405 on the board and mounted to a rather large aluminum heat sink. In addition you will most likely have to replace R3159 and R3160 (6.8 ohm 1w) resistors and test the remaining low ohm resistors for change in value.
I would strongly recommend that you not do this repair yourself in this particular unit it is rather complicated by having to remove the boards to gain access. Notwithstanding that you could damage some of the smt components just taking the board out, you need some diligence in labeling outputs to crts from ssb board and on both ends of the connectors - otherwise re-assembling it could cost you a greater failure somewhere else. In a nutshell, replacing convergence amps in this unit is "extremely difficult" compared to say a Samsung which is a walk in the park! And the real downside is a little mistake can really cost you... Besides, a shop would really earn their money on this one..
Bill

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The convergence amps have most likely failed. This is the number one leading cause for the symptom your describing and the most common failure on that unit.
Your Tv take two STK392-120 Sanyo Ics for convergence amps, located at Ic7404 and Ic7405 on the board and mounted to a rather large aluminum heat sink. In addition you will most likely have to replace R3159 and R3160 (6.8 ohm 1w) resistors and test the remaining low ohm resistors for change in value.
A shop would really be earning their money on this particular unit if they charged $400 - $500 for the repair. It is an extremely difficult set to work on and there are a number of little problems that can reach-out and bite when attempting the repair.
Good luck!
Bill

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Those symptoms describe a convergence failure. Replaced both Stk392-120 convergence amps made by Sanyo and R3159 , R3160 (6.8 ohm 1w) resistors and check the remaining low ohm resistors for change in value.
This is probably one that you'll want to take to the shop unless you have some fairly good skills in electronic repair. Job will probably be about $350 - $425 if you take the unit in yourself and shop around for a reputable shop.
Bill

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A sign that amps are going bad, right now you can check resistors in convergence board alongside the amps, check resistance to see if right.

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You are having convergence problems. If you can't reset in menu then you may need amps replaced. You can also call PTS18008447871 and ask for price on convergence board and just replace.

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