Question about Philips Magnavox 51MP392H Rear Projection Television

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Hour glass picture

The picture bows up at bottom and down at top

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Re: hour glass picture

I would suspect that the convergency amplifiers ICs are not working.
Are the colours distorted?

Posted on Jan 15, 2008

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Hour glass bowing on the top and bottom of my HCP4752W Samsung

Check the resistors near the ic, and the fuses to the ic's, i bet you will find an open fuse. the fuse will look similar to a resistor without color bands. use a dvm and set it on ohms, with the tv turned off.

Sep 02, 2009 | Samsung HC-P4752W 47" Rear Projection...

1 Answer

Cheap Fix?

I will strongly advise you to replace the two STK392-120 as a pair. and this will cure your bowing picture problem. You may need to re-converge your set. best of luck.

Nov 05, 2008 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Pt-47wx49e convergence problem

I just replaced the 2 convergance chips, but it did not seem to fix the problem. I then tested all the resistors that feed the convergence chips anf there was a 2.2 ohm fusable blown. IT was R7050 on mine. That seemed to fix it so that I could adjust all the colors through the convergence 2 screen. There seems to be a slight bow near the bottom when you look at the c2 screen, but not noticable when you are watching a picture. Since I got this broken, I am not sure how perfect it should be.

If anyone can send me the service manual, I would appretiate it. Thanks.

Oct 10, 2008 | Panasonic PT-47WX49 47" Rear Projection...

1 Answer

65 in sony projection tv

Defective convergence PC board. Must be checked by pro/tech

Apr 21, 2008 | Sony KP-46WT510 46" Rear Projection HDTV

1 Answer

Bowing in the middle like an hour glass

about the zenith it seems you have the flyback transformer malfunctioning - try to change it - delfo

Mar 22, 2008 | Projection Televisions

1 Answer

Distorted picture

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 doing tests. Best of luck, hope ya fix it.

Jan 24, 2008 | Sony KP-57WS500 57" Rear Projection...

1 Answer

Bowed picture

malfunction of the pinchusion circuit.check pinchusion diode and transistor and pincushion ic

Dec 23, 2007 | Hitachi 53UDX10B 53" Rear Projection...

1 Answer

Bowing in the middle like an hour glass

OUCH!!!! Don't kick me...would be my response if I were your TV
Convergence amps problem.

If it works after a kick I'd say poor solder joints on the convergence amp leads

Dec 17, 2006 | Zenith IQB50M90W 50" Rear Projection...

1 Answer

Horizontal hour glass picture

The convergence Ics need replaced. In Hitachi, resistors and sometimes a coil needs replaced as well. The convergence/deflection PCB is available, but, the cost of that board is higher than having a servicer come to your home and repair the unit to component level. If you are not familar with this circuit, then call a servicer. Have them replace both ICs not just one. Make sure they are repairing to component level and not replacing the board. Hope this helps.

Dec 16, 2006 | Hitachi 43FWX20B 43" Rear Projection...

1 Answer

Picture Distortion

you have a convergence problem.. If you understand how this works then you can go into the set find the convergence ic's and replace them and sometimes you need to do some alighnment as well. Its always best though to let a service tech do a job like this as he will have all the proper equipment to adjust and troubleshoot the set Good luck

Mar 30, 2006 | Sony KP-53HS30 53" Rear Projection...

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