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I have a Philips 42pf7421d/37 lcd tv having problems. When you first turn the tv on it seems to work perfectly fine. About 5 minutes later my picture cuts out and I get a scrambled screen. Turn it off and on, same problem. Any ideas? Hoping I can get this fixed cheaply doing it myself. Im handy but dont know much about televisions. Thanks

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  • 1,669 Answers

First, you need to make sure all of the vent panels on the tv are clear of obstructions. Heating may be causing the problems. Next, get a hold of a clean, dry source of forced air and blow out the inside of the case and the internals of the tv.

Posted on Jan 22, 2013

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Posted on Jan 02, 2017

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SOURCE: RCA L32WD12 32in. HGTV LCD Television

I had the same problem happen this afternoon, so I took it apart, and the source of the problem is the key controller panel (behind the buttons). It's held in place by 2 screws, if you take the case apart, which is literally only 15 or 20 screws, and then loosen the 2 screws holding the key controller panel on, and then use a small screwdriver to space it out from the button caps. Tighten the screws, and put it back together. Just be careful not to let it go too far to the other side, or you'll have a problem with the menu going on and off at random, which is just as annoying.

Posted on Aug 01, 2008

  • 1 Answer

SOURCE: LCD TV won't turn on, Screen and Standby light blink

I had a similar problem which I have partially solved. The power light flashing could be due to a shorted electrolytic on the power supply board but in my case it was a shorted IC on the main board, the one with the input connectors. The IC marked 7001 shorted and got hot enough to melt the plastic. Replaced it with a new one from Mouser. The supply measured on the end of inductor 5001 farthest from the IC reads 12V now. This is a surface mount part and has a pad on the bottom that may be soldered to a pad under it. I had to cut the IC apart carefully with a Dremel cutoff wheel to remove it. That fixed the problem with the light and the remote now turns the TV on and off so the logic is working.

I now have the problem of the backlight not turning on. The driver board, the ones with the transformers, are made by Intechwave, the only info I can find is here: http://www.peopleworks.co.kr/kor/product/product_list.php?intDivision=4&intClass1=16&intClass2=41

This a 45kHz RF driver and it is not starting. If I can figure out why I'll post it for all the people who reported slow or no turn on of the backlight. These boards should have 24V between the red wires on the connectors and ground, as mine do.

Posted on Jan 27, 2009

  • 187 Answers

SOURCE: 47" Philips LCD TV will not stay on and show a picture.

Your mainboard needs to be replaced.

You can get one on ebay and replace it or get someone who can do that for you.

if you still have guarantee, it is covered, if not you will need to buy it.

Posted on May 27, 2009

  • 61 Answers

SOURCE: TV freezes at "Philips" screen

a professional. -These electronics go threw a self diagnostic when they start up, normally they turn off when they find a problem.

Posted on Jun 01, 2009

roety
  • 585 Answers

SOURCE: my 42pf7421d/37 flashes a red light when i turn

Hi, philips (sony and others) uses the flashing red lights to give an error code, but all that means is that a circuit is probably shorted and doesn't always indicate specific components,.
42pf7421 is an LCD that basically has two large circuit boards in it. If you have technical ability you can examine the power supply to see if any capacitors are swollen on their top sections. this is a common failure in many LCDs and Plasmas, but would require soldering to replace them. If no caps look swollen troubleshooting this set would involve voltage checks , a service manual and board replacement.
Could be either the main board, power supply or possibly a bad screen (panel) If you have the set open you can sometimes see the LCD bulbs light for a split second indicating that a problem with either the panel itself or the ballast power section. If it lights for a second sometimes I can see that one bulb is not lighting. One bad bulb will cause the set to go into shutdown mode , indicating a bad screen (panel) .
I hope this info helps you decide on the options before you
1. call a tech expect to pay an estimate fee, parts and labor btwn $200-$1000
2.check the power supply, reseat the panel cable, look for a momentary light of the screen. order a suspected part and replace it yourself.
3. buy a new TV (sry bad option)
hope this helps
Eric

Posted on Sep 01, 2009

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My 42pf7421d/37 flashes a red light when i turn


Hi, philips (sony and others) uses the flashing red lights to give an error code, but all that means is that a circuit is probably shorted and doesn't always indicate specific components,.
42pf7421 is an LCD that basically has two large circuit boards in it. If you have technical ability you can examine the power supply to see if any capacitors are swollen on their top sections. this is a common failure in many LCDs and Plasmas, but would require soldering to replace them. If no caps look swollen troubleshooting this set would involve voltage checks , a service manual and board replacement.
Could be either the main board, power supply or possibly a bad screen (panel) If you have the set open you can sometimes see the LCD bulbs light for a split second indicating that a problem with either the panel itself or the ballast power section. If it lights for a second sometimes I can see that one bulb is not lighting. One bad bulb will cause the set to go into shutdown mode , indicating a bad screen (panel) .
I hope this info helps you decide on the options before you
1. call a tech expect to pay an estimate fee, parts and labor btwn $200-$1000
2.check the power supply, reseat the panel cable, look for a momentary light of the screen. order a suspected part and replace it yourself.
3. buy a new TV (sry bad option)
hope this helps
Eric

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