Question about Philips Magnavox 26MD357B-37 26 in. LCD TV/DVD Combo

1 Answer

Cap checker bad

Cannot turn on (no screen on) then cannot turn off green light back to red without unplugging. Capacitors on power board APPEAR to be ok...?

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  • Doug Pierson Nov 19, 2013

    What is the voltage out to the main board and to the screen?



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  • Expert
  • 115 Answers

Fault in main controlling board

Posted on Nov 19, 2013


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Posted on Jan 02, 2017

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SOURCE: TV does not turn on/red led flashes 7 times in front

this is common issue with this model and through your troubleshooting is tied to y main board. blinking led on logic main in normal operation. when replacing y main always good idea to replace y upper and lowe buffer boards as they complete a circuit and sometimes replacing one without other could cause additional failure on remaining boards

Posted on Aug 19, 2008

  • 1 Answer

SOURCE: I have a 50" philips plasma , shuts off and blinks red light 2 and 7 times Y main board module problem?

LOL! OMG! I have solved this problem for now. This is what worked for me. First off relax and don't think you need expensive technicians, and from blogs I read it's obvious that Phillips thinks they got their money so your waranty has expried and to bad for you, they don't care.

My problem and the run down. Bought a 50 inch plasma Phillips TV from BJ's Wholesale back in 2006 for about $1,700.00. Note I went o BJ's website to check out the Tv's as I have experienced problems and it looks to me the entire brand of Phillips is not even being sold their anymore. Ha, go figure.

Just this year early 2009, after having about three years I would watch HD cable and at times a click noise would occur where it even clicked the stereo amplifier where my surround sound audio would click as well with the tv, it would appear to go in silence, picture would go balc for about 10 seconds and go back on. This means from what I see later is that your blinking red lightb issue will be coming shortly in the future. It to me is a warning that if you are at that stage, expect to become a victim of the red light district. If this is the stage you are in, and it will still turn on and off ok, and your under warranty, make the complaint immediatly.

Then just 5 days ago, I tried to turn television on and it clicked as if it was going on and screen didn't show anything, and I got a 4 rapid flashing red lights a pause in flashing then 4 flashing red lights.

I googled these very blogs, check them all out as their are different ones and I have a 50 inch and even though the blog I took as a reference was one who had a Phillips at 42 inches etc, or different sizes it may not matter, look at flashing red light problems with all HD plasmas that are Phillips.

I have to give credit to a blogger by the screen name of Doug Mohr. Let me eloborate what his idea was and what I experienced to solve the issue.

It appears to me before all thse techs or electrical guys and TV repair men say they will fix your tv for the price in which you pretty much paid for it, STOP! Wait a minute. What if I told you you may be able to fix it for about $5.00 or $10.00. It reminds me of car mechanics that when my Mercedes shaked in idle position the dealers would be like hey you need to get a new timing belt, or a sensor, etc when all you really need is new spark plugs. Well isn't spark plugs cheaper? Yes indeed and it works fine.

Well, credit to Doug Mohr I went to my garage and looked for an older PC connection to an old computer of mine that was replaced with a new one. Apparently the same sort of connection to power up your computer is the same as the plug to your television. As soon as I saw that on a blog I went to replace the power cord.

The power cord to my old computer Dell from like 2003, looked as if the three little holes that plug into TV were smaller then the actual Phillips connection to TV, but only a little. I realized that it fir into the TV in back perfectly. I then pluged it in and damn it, it still had flashing red lights again. When it did it it again communicated to my receiver for audio surround sound which my barnd is Sony and it shut down including the volume was on only 10 seconds with no picture. So I turned off the receiver for audio, and unplugged with old PC Connecter to TV, waited another 15 seconds, and sure enough I plugged in as if I let it fail once however I may have done what is known as cycling my TV and new plug letting the TV understand that the cord is different. Try a few times. So TV on second attempt withoutr turning power on was plugged in and their was no light blinking anymore. I gave it 10 seconds and it didn't turn flashing red like it does even if you don't power it yet. So, I turned on TV and the picture showed, and then put on my audio reciever and it worked great back to normal.
Not everyone has extra PC cords lingering around, however Doug says you can pick them up for like $5.00. However take your cord out of back of TV, and go somehwere in house where you may have stored cords in the past, like I do for it comes in handy to see the shape of end that plugs into TV is the exact same as all PC connections for power.

So it may not be these Y coonection X stuff TV repair men talk of, and you may not have to go as far as taking your TV apart like I see some do. My example of don't replace your timing belt when it's a spark plug for your car, and don't be having repair men getting paid just to show up at your house. Try this it worked for me and my TV is 3 years old.

I also suggest to save your plasma TV, I was given a pointer to chnage your color temperature to cold, when you have option of like hot warm cold on your menu. I was gievn a pointer the cool color temperature will make your plasma last longer then to have in in warmer modes and it doesn't seem to really affect my 1080 picture. I did that after I plugged in my PC cord to TV. I am all set now. So it may not happen for you first attempt, so cycle and try. When I did this with original cord it was stubborn and after unplugging and putting back on it worked, then after I shut down again it wouldn't at all no matter how many times. A darn PC connection and different power supply cord did it as others in here look for an actual Phillips cord replacement whcih seems to be according to other bloggers non existant which I really don't know the truth to that. Doug said this was something Phillips Customer servioce didn't give pointers on, and the only person that fixed it was you or me. However advice is your tv gopes blnk sometimes and back on and your under warranty, call them ASAP and don't let them give you the run around to staul you deliberatly to get you passed the warranty period, from what I read is the Phillips compnay is like look, you paid us much money for your TV, and now you have the same problem everyone else does, and your warranty has expired, so in other words their attitude is take a jump in the lake pal.

It seems that the plug to PC that is now my TV power cord was more snug to rear to connect then original cord. According to Doug, the cords were shiiped from China ( go figure ) anmd their have been power issues even with Sony and much more for faulty power cords in which they are manufactured there. The PC cord was made in China, however it was a change that my TV seemed to enjoy, and I suggest you try this and give it a few attemps before you go spending 100's if not more then 1,000.00 to fix, when it usually means your better off just getting a new TV. Look the economy is bad and their are TV repair men, but that's how they make a living. For them to not get paid a decent fee to see your tv and fix it is not the way they can make their money by telling you to plug a PC cord into your TV and they get paid squat. So try that and good luck, my TV is working great. It's just some power cords over time just s#%t the bed.

Thanks Doug Mohr!

Wayland Williams

Posted on Apr 17, 2009

  • 80 Answers

SOURCE: 7 red flashing lights, won't power up..

Check the power board for capacitors with the tops bulged up. They are 3300uf 10v. There are either 2 or 4 of them depending on your set.

Posted on Jun 01, 2009

  • 227 Answers

SOURCE: Philips 42PF7320A/37 blinking red light

hello, amigo if the all the caps are godd then you have to replace the power supply board. don't try to fix it this is not an easy task. you are looking at almost $200.00 with tax an shipping. just go to google and type your tv model # and ask for the power supply board or just look for the part# on the board itself. good luck

Posted on Jul 29, 2009

  • 7 Answers

SOURCE: tv wont turn on


Posted on Aug 31, 2009

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Hello Sagar,
green led means tv powered on and status ok.
Red blinking light almost always means defect, overcurrent or overload.
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My first move would be to inspect the power supply board for bad capacitors. look for a bulged or skinned capacitor. Even if these capacitors look good, they may be failing. You will need an ESR meter to check for current. You will need an ESR meter for this. Then you will need to check the Mfs with another type of capacitor checker. These two types of capacitor checkers will be a necessity to find these failing caps. If the caps and voltages check out fine in the power supply, you will of course need to inspect and check the capacitors in the signal board. Definitely, there are bad capacitors in one or both boards. I have not repaired this particular model, but the symptoms you describe, tell where to look. Thanks for asking and show all hand of support!

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Unplug the tv for about a minute and then plug back in. If staill the same problem . Unplug unit and check the power board for bad capacitors. Good caps look like flat top small soda cans. If they are not flat and have a bulging top? They are bad and need to be replaced. caps can hold a charge so be careful !!

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Was watching tv without any problems and then all of a sudden tv has no picture. Red standby light is on, green light turns on momentarily but still no picture and goes back to red

There more than one boards that can make you have black screen, troubleshooting is required to find the caused.
It goes into shutdown (red) becuase it may have sensed the shorted circuits some where in the set, or faulty power supply, main board, backlight inverter board.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
Failed TV and Monitors:
Learn about bad caps:
Capacitors kit: he can make you a set of caps.


Please post back what you find.

Dec 03, 2010 | Sylvania LC260SS8 26 in. LCD Television

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First, it does not make sense if you unplug the main board from the power supply and the TV comes on, please verify which connectors that you unplug. I would unplug the inverter board power connector to see if the 24vdc and 12vdc will work porperly first.
Please see my basic troubleshooting guide here:

Capacitors kit: he can make you a set of caps.

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Veiwsonic 924x

This is a generic symptom that could happen to any LCD monitor.
The following is a generic answer applicable to most.

The most possible causes are bad capacitors or a bad semi-conductor.

Open the unit and check to see if any of the capacitors in the power supply or other boards look domed or vented on the top.

Replace any capacitors accordingly. Use the same value capacitors. Most often, 1000uF 16V or 25V, 470uF at 16 or 25V, 220uF at 16V or 25V.

If this doesn’t solve the problem, try checking the surface-mount transistors on the inverter board that run the lights. Some times these transistors go bad and can cause the power to cycle up and down. Check the area for any cracked or overheated ceramic or mylar capacitors.

Don’t forget to check for caps on the main board. Some times these boards are overly simple and only have a couple of caps, but other times they are teaming with them.

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