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How do I fix a burned out power supply board on a Philips FWD 185/94

When connected to mains, smoke is seen coming from transformer marked T901 on the power supply board.

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  • Philips Master
  • 670 Answers

Hi Qdiv,
If the power supply has burnt; it is better to replace it rather than repairing.
Good luck.

Posted on Apr 11, 2015

Testimonial: "Thanks. But Philips support is unwilling to help - where else could I get a spare board or if I am able to get the transformer I could replace on the board. If you could share info on any sources that you / others are aware of, would be very useful, please."

  • 6 more comments 
  • Sp Gupta Apr 12, 2015

    Which country are you from? Here in India we can get almost all kinds of transfarmers rewound. If you have someone doing in your area get the transfarmer rewound. Can you please post the picture of the power supply ?

  • qdiv Apr 12, 2015

    I am in India, ~60km from Chennai. I plan to hunt around Ritchie street for a board or transformer; I do not know where to get it rewound. I am attaching a photo of the board, component side. The yellow block near centre is the one that I think smokes though no external damage is visible (yet).

  • qdiv Apr 12, 2015

    A service manual is available on the internet athttp://www.givefile.net/get/file/S/36863... This gives the circuit diagram but actual voltages are not known;

  • Sp Gupta Apr 12, 2015

    http://elektrotanya.com/?q=en/show_tvinf... Please try this website for a complete diagram.

  • Sp Gupta Apr 12, 2015

    If you say smoke coming from or near the transfarmer, sure there will be some other components around it. Please check them thoroughly.

  • ravnil kumar Dec 18, 2016

    Hi can i know the resistor color coding of r915 of that power supply pcb.

  • ravnil kumar Dec 18, 2016

    Hi can i know the resistor color codings of R915 of that power supply.

  • Sp Gupta Dec 26, 2016

    can you please give the colour codes on the resistor?

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Posted on Jan 02, 2017

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Sony str-av1020 reciver Power supply transformer burned!


http://www.sony.owner-manuals.com/STRAV1020-service-manual-SONY.html

Aug 19, 2016 | Sony Audio Players & Recorders

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42PFL7422D/37 Flat Panel LCD TV no picture no sound


I HAVE A 42 INCH PHILIPS MODEL 42PFL7422D/37 TV.

MY PROBLEM IS THAT IT HAS NO PICTURE AND NO SOUND.
THERE IS A GLOWING BACKLIGHTING.

THERE IS A BLUE LIGHT WHEN I TURN POWER ON THE TV. NO CLICKING RELAY SOUND.

MY PROBLEM WAS IN THE SLAVE INVERTER BOARD.

THE IC CHIP WAS BLOWN - SEE PICTURE. THERE IS A BURNED, DARK BROWN MARK ON ONE OF THE CONTACT LEADS ON THE CHIP.

THERE ARE $20 FIX IT KITS THAT YOU CAN BUY ON EBAY TO REPLACE THIS TINY LITTLE CHIP BUT IT'S RECOMMENDED THAT YOU SOLDER VERY CAREFULLY. I TRIED, AND DAMAGED THE BOARD SO I BOUGHT A USED ONE.

REMOVING THE IC CHIP IS PROBABLY BEST DONE WITH A HOT AIR SOLDER GUN. THEY COST ABOUT 50-200 DOLLARS.

AFTER INSTALLATION IT FIRED RIGHT UP.

IN ADDITION TO THE JUST BUYING ANOTHER INVERTER BOARD, I ALSO TESTED THE MASTER INVERTER TRANSFORMERS. ON THE POWER SUPPLY BOARD, I TESTED THE DIODES, AND RESISTORS, AND CHECKED THE FUSE.

AFTER ALL OF THE ABOVE, I UPDATED THE FIRMWARE BY GOING TO THE PHILIPS WEBSITE.

LUCKY FOR MY SITUATION IT WAS NOT THE MASTER INVERTER, MAIN , TCON, POWERSUPPLY, OR DAMAGED BONDING ON THE LCD PANEL ITSELF.

TOTAL COST $50.

GOOD LUCK!!!

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1 Answer

I have this lg 42lc7d that keeps burning the transformer. I have put n two supply board n each time I plug in the transformer smoke n burn lead wire that goes to transformer.


Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

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Power supply card PLHL-T722A, 2300KEG033A-F, had a blown fuse F101 (T1AH250VP). Replaced fuse with T1AL250V. Plugged tv into wall, and resistor R5 lit up and started smoking. Thus pulled plug out...


We sell a repair kit for this board, which has the fuse, resistor and the IC that usually fails along with them.

You can find it at http://www.coppelltvrepair.com .

I've seen that board fail in at least three different ways, though, and this is the least bothersome of them.

We offer a repair service and have about 90% success even with burned boards. You don't pay any service fees if we can't fix the board.

Finally, when available we also sell boards ready for use with a trade-in option. That ends up a little more costly than a repair, though.

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Panasonic pt53wx53 led blinks once


unplug the set---where smoke something has burned.

I would with back off have a look---look at high voltage transformer and that area of board and pay special attention to C509 (brown cap in front of high voltage transformer about 2 inches---it will be marked with that C509 on board.

If it is cracked or burnt it is bad---these fail a lot.

If the set needs to be worked on it has a lightbox---about 8 bolts removed and entire guts or chassis comes out in one piece--can be powered up out of the cabinet.

Let me know if need more information.

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I bought philips model no. 47pfl7403d/27 in 2008 .Suddenly last month it started skipping picture but we could hear sound.After few days it started smelling like something is burning and it stopped...


Seal deal w/ ours. I took it apart and the power supply board had the burn marks on it. Just ordered another power supply board (pn: 272217100571) for ~ $100. TV back panel comes off fairly easily to get at boards.

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Burning smell came out of the Tom Tom 910. Now does not boot up on mains or car cigar lighter socket


The power supply or voltage transformer or possibly capacitor is burnt out. You will have to visually inspect the main control board for burn marks and swelled up capacitors. You can use an ohmmeter to test them as well.

Dec 04, 2009 | GPS

1 Answer

CARRIER AIR CONDITIONER/HEAT PUMP PROBLEM WOULD NOT RESPOND TO THERMOSTAT. UNIT IS AT LAKE HOUSE WHERE WE DO HAVE BAD STORMS. IN CHECKING, INSIDE PART OF UNIT HAD BURNED UP THE TRANSFORMER BUT NOT...


what I have always been told is if your 24 volt side burns out check the high volt side if the hi volt side burns out check the low volt side.

A quick way if the primary side is burningout due to a problem with the low volt side:
1 MArk all the thermostat wires at the indoor unit
2 Disconnect them at the indoor unit.
3 Check main line voltage before proceeding (A 208 volt is not considered 220V and 240v Is not considered 208V> In these circumstances the voltage may have changed with the power company replacing a transformer and now you need to change the main power input lines at your control transformer for the correct operating voltage). If okj then proceed:

4 If you have an amp meter attach it to one of the lines going to the transformer.
5 Apply main power and listen for hum, note if smell starts again and if so problem has to be in board or main incoming voltage too high or too low. Amp draw should be less than 3 amps.
6 If your to this point and still havent found any trouble in the above as of yet, Connect the wire marked "C" together. Then just touch the thermostat wires one at a time to the places where they go on the indoor unit and watch the amp meter. If you donmt see the meter jump the circut is probably ok but leave them disconnected until you touch all of them to the correct place or wire. Here is a possible problem I ahve seen a thermostat wireing problem if the wires are stripped too far and a "whisker" of the wire sticks out and allowes one of the other wires to cross short out. In this case just cut off the excess wire or bend it over out of the way asnd continue with the test. You can always cut it off later after the tests. If you see the meter jump up and stay up and /or blowes the fuse the wire that you used and it blew is where to consentrate.
7 No wiring problem found means that you could have a relay or contactor not pulling in properly.
and this will cause the amp draw to go way over the transformers power out put or VA rating.
8 Inspect the thermostat wiring for the "whisker" I mentioned above.
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If this helps you please rate me as high as you can and thank you for using fixya.

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check your power supply board,higher voltage than the normal voltage coming out to your power supply,replace the oscillator that control your regulator.

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I'm not sure which 'line transformer' you suspect but it isn't a likely place to look for this problem.   

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