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Philips Magnavox 17MD255/17 LCD TV had AC voltage applied.

I have a Philips Magnavox 17MD255/17 LCD TV. The power adapter for the unit was defective. I tried to created my own power supply and did not realize I was feeding AC voltage into the TV as opposed to the DC voltage suppled by the correct power supply. The TV will not turn on now. Is this somehting that can be repaired or is it beyond help?

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It seems your "power regulator" a small unit inside tv device has damaged due to wrong power supply. In this case usually the power capacitor burns and few other electronic components like triodes. Get the help of a electronic chip technician to replace the damaged components.

Hope it works.

Posted on Mar 28, 2008

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I have a Magnavox model 51MP3964H/17 and the power light is blinking.


Hello,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Good luck.

Apr 05, 2011 | Philips Projection Televisions

3 Answers

Power supply not turning on


Hello,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Good luck.

Apr 02, 2011 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

37 INCH LCD MAGNAVOX TV WILL NOT TURN ON. MUST BE


This problems,very common in LCD tv,after the tv was in used about a year or two.The new technalogy LCD tv don't handle heat very well,not like the old CRT Tube Tvs.The power supply board tend to have bad capacitors componnents leakage,that bulges up it top or puff up gases escape,that why it take times or couples pushes to the power botton to turn the tv on.U know basic electronic's,and have soldering tools and solders?Take the tv aparts,check for these bad capacitors,that bulges,puff up in the power supply board and replaced them,than ur power will work normal again.Or tries Websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

Apr 29, 2010 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Hi, I have a Magnavox 17MD255V/17 combo dvd-tv. Everything works fine except that the AC adaptor has a high-pitched whistle that continues while the tv is on. I tried unplugging from the the tv itself and...


TAKE THE AC ADAPTER APART. LOOK AT WHERE THE MANUFACTURER PUT HIS GLUE AND REDO IT CLEAR NIAL POLISH WORKS BETTER IT FLOWS UNDER THE PARTS BETTER. YOU CAN PLUG IT ALL IN WHEN ITS APART BUT MAKE SURE NOTHING CAN SHORT OUT. THIS WAY YOU CAN PINPOINT WHERE THE NOISE IS COMING FROM. OTHERWISE GLUE THE TRANSFORMER AND ANY SMALL FERRITE BEADS THESE SWITCHED MODE POWER SUPPLIES OPERATE AT HIGH FREQUENCIES AND LOOS PARTS CAN VIBRATE CAUSING THIS NOISE.

Dec 27, 2009 | Philips Magnavox 50ML8105D 50" HDTV DLP TV

1 Answer

1993 46 inch Magnavox no picture


Hello All,

I posted this earlier, however I believe it applies in this case to:

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

Nov 02, 2008 | Philips Magnavox 55P9271 55" Rear...

4 Answers

Where can I buy Dmtech AC Adaptor HASU12FB - Currys no longer stock the part


You might want to try a HASU05F. They are the same voltage, current, and connector and run cooler.

Aug 15, 2008 | Projection Televisions

1 Answer

I have magnavox TV


you will need an adapter for it....

its the current frequesncy what he told you.. in US they use current of 60hz frequecny....

the place you live in use 50hz.. that is the reason...
see this link...it wil help you surely..

50hz to 60hz - For: 1.Use overseas to test products destined for use in the US or other 60Hz countries;
2. To operate 60hz machinery from a 50hz utility.

Jan 19, 2008 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Tv not working


Hello gabed,

 

The problem may be in your switching power supply or in your high voltage power supply, I would suggest that if you have a background in electronics you do the following.

 

1) look for any blown fuses and replace them

2) Using a schematic measure the incoming AC voltage and the DC levels on the output of the switching power supply.

3) remove power from the set and take resistance measurements to determine if there is a short circuit anywhere in the DC path.

4) Measure for shorts and opens in the High Voltage section of the set.

 

These are the usual checks you will have to do.

 

Now if you don't have a background in electronics, I would suggest that you have a qualified TV technician come over and check your TV set.

 

I hope this helps,

Thank You,

Shuttle83

Oct 14, 2007 | Philips Magnavox 9P6034C 60" Rear...

1 Answer

Magnavox tv


This might be a power supply issue either in the switching power supply or in the high voltage power supply. In any case you will need a schematic, a voltage meter, and if possible an oscilloscope to troubleshoot this problem. If you do not have a background in electronics I would suggest that you take the TV to a repair shop.

Oct 04, 2007 | Philips Magnavox 9P6034C 60" Rear...

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