Question about Philips Magnavox 51MP392H Rear Projection Television

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Magnavox 51MP392H/17 I wanted to add what has already been done by a friend. Power Supply Voltage Checked All fuses checked Compositors checked Burn Circuits checked Made sure Modular Plugs Seated Correctly Checked for ground leakage The tv still doesn't work after this was done.

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  • penguinch468 Nov 24, 2008

    We are trying decide what to do. I guess it depends on how much the replacement parts are. We have not yet had time to investigate that. Thanks so much for your help.

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From my experience most people find out their Convergance IC's were the cause and burned out again because of faulty 6.8 ohm resistors or just plain failure to replace the the resistors when they replaced the IC's. sadly if your planning on spending more money I suggest New IC's use 150's instead of 120's ALSO, make very sure you've changed out all 12 resistors and make sure they are metal film resistors.

Great reference link that I posted pictures on, check out page 3
http://www.techlore.com/forum/thread/16736/Magnavox-51MP392H-17-51-quot--TV-has-double-vision/

Where I got my parts that worked:
Suburban Electronics
http://www.suburban-elect.com/
Manual Library you should find all you need here:
http://www.techlore.com/group/2/list_downloads



What you possibly need:
(2) STK392-120 OR STK392-150 IC
chips
(12) 6.8 Ohm Metal Film resistors
15 watt pencil solder pencil, DO NOT use a high watt iron you will fry the surface mounted item.
good leaded solder, and flux

BTW, if you give up on the TV I'm still looking for a Convergance circuit board yours sounds fried but I would mind trying it out its better then nothing, and ther are a few other people on here looking for parts... so you never know...

Posted on Nov 20, 2008

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1 Answer

51mp392h/17


If you do not have menu, problem in power supply, supplying the 130v to the high voltage circuit. Check all pico fuses in power supply.

Nov 16, 2011 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

The tv is a Magnavox 51MP392H/17 and has sound but no picture. Any ideas?


TV is in high voltage shutdown protection mode. Check to see if Horizontal output transistor is shorted or open. If not then resolder all solder joints on HV transformer. If this does not fix it then you will need to do voltage checks off of H.O.T. and then possibly a bad HV transformer.

Apr 30, 2010 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Magnavox 51MP392H. I have no picture, but do have sound.


Check with the team at www.TvRepairKits.com for a kit. They seem to know the Magnavox sets inside and out.

Aug 02, 2009 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

I have a magavox big screen


Hello cce357,

This can be any number of things, here is a possible listing:

1) No High Voltage (check the IHVT or the trippler)

2) CRT filament transformer winding open (check the windings that supply voltage to the CRT filaments)

3) Video / CRT socket boards bad (highly unlikely but check anyway)

4) High Voltage power supply malfunctioning (related to problem #1)

This listing is a good starting point. I would suggest that you purchase a schematic to aid in testing the voltages mentioned in the 4 steps above. If you have a background in electronics then do the above, if not please ask a qualified TV technician to perform these steps.

Thank you,

I hope this helps,

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

Dec 08, 2008 | Philips Magnavox 55P9271 55" Rear...

1 Answer

NO PICTURE OR SOUND


Hello mtf420ak,

I do not believe this is a problem with a fuse since by your experiment both fuses are good. Now put the fuse back in and if there is still no picture and no sound we can assume that the problem might be some other component on the power supply board, and or the High voltage section because this sounds like a shutdown circuit problem. If it is a shut down circuit problem the section that might be malfunctioning would be the High voltage section of the TV. I would suggest that you let a qualified TV technician troubleshoot and repair this television. I say this because this is not a simple problem, this is an issue that requires a knowledge of electronics and TV repair.

I hope this helps

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

Dec 03, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

My 4 year old Magnavox 51" rear proj TV cycles ON/OFF every 5 sec


Hello bcd74071,

I would suspect that the shutdown circuit is triggering. Have you checked the HV anodes of the CRTs to see if the voltage is fluctuating? In addition I would check the Horizontal output transistor and the Power FET in the switching power supply. The fact that you removed the blue CRT and put it back and the problem seemed to go away points to a possible cold solder joint which could have this effect also. There are a number of things that could be wrong, Here is a list of some of them that you can check:

1) Faulty component on power supply board (check capacitors for problems)
2) Faulty connection on power supply board (check for cold solder joints)
3) Faulty component on Deflection of HV power supply board (check for bad capacitors, zener diodes, Horizontal Output Transistor, and Integrated High Voltage Ttransformer)
4) Faulty connection on HV power supply board (check for cold solder joints)
5) Faulty CRTs (check anode voltages, remove anodes from CRTs and see if the set remains on, if so check for shorts on the CRT socket board or using a CRT analyzer check for internal CRT shorts)

These items are but a starting place for you.

I hope this helps,

Thank you,

Shuttle83

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

Dec 01, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Magnavox 51MP392H/17 No pic only sound


Hello winwithrose,

The popping sound may have been a capacitor. The chance are the capacitor is in the HV section of the TV set and is part of the supply to the Horizontal section of the TV. First if you do not have electronics experience I would suggest you take the TV to a qualified TV repair shop. OK now if you have electronics experience I would say to unplug the TV, open the set up and do a physical inspection of the TV you will be looking for a capacitor that has exploded; if you find one look at the schematic for the TV and find its value. Then do so checks to find out why did the capacitor explode. Most likely the capacitor exploded because of wear and tear, but it always pays to check. Replace the capacitor with one of the same value and then turn the TV on, use your voltmeter to measure the voltage across the capacitor to make sure its the same or close to the value on the schematic.

These are the basics of what to do

I hope this helps

Thank you,

Shuttle83

Sep 02, 2008 | Philips Magnavox 51MP392H Rear Projection...

2 Answers

I have a Magnavox 51" Projector TV. Model 51MP392H/17


Hello bullmuscle,

This is a power supply problem, I would suspect the HV power supply because the primary and secondary supplies anymore are tied to the HV power supply. This type of repair requires certain pieces of equipment, to test voltages, look at signals, and to if need be test for shorts in inductors (Switching PS transformer and Flyback transformer). I would not recommend that you try to fix this yourself, The cost for this type of problem is not that expensive and can be done in one evening, if the parts are available. You may be fortunate and it could be just a blown fuse, in the HV or LV power supply circuit

I hope this helps,

Thank you,

Shuttle83

Jul 25, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Philips CRT Rear-Projection TV 64P8342


Something is preventing the power supply from operating:
Possible causes in order of likelihood:
1) Convergence amps failed overloading the supply (See if you can disconnect them)
2) High Voltage circuit has died. (Most common death mode)
3) One of the CRTs has shorted
4) The power supply itself has died (Is there a lot of dust covering it?)
See if you can isolate the failure by working down the list.
Hope Ya Fix it!

Feb 11, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Magnavox model#51MP392H/17


How much is the conversion box on a foor model magnovox televisiion..

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