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When turned on i get red and green steady light no picture no sound.

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  • 4bettalivin Aug 01, 2009

    my 50" plasma model 50mf231d/37 was having the blinking red light problem bought and replaced power supply board now when turned on I get a steady red and green light no picture and no sound.

  • 4bettalivin Aug 01, 2009

    red and green steady light no picture or sound when plugged in magnavox model 50nf231d/37 was given link to firm upgrade but no instructions on how to perform a firm upgrade

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  • Master
  • 19,396 Answers

The TV is on protect mode.

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

Also ensure that the fault is not coming from a faulty receiver box sending bad signal, check if you get same problem with no receiver box or dvd connected.

If that does not work, and you keep having a flashing led on front of the TV, and tv turning off by itself after a while, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible reasons.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , startingthe flashing light.


If you are in situation one, then theTV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occur are a blown capacitor on power board, a convergence IC has blown, or a fault on Digital board.

Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.


If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

Posted on Aug 01, 2009

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  • Master
  • 3,037 Answers

Have you recently done a firmware upgrade? If not, then try doing that from the magnavox website. http://www.m4c.magnavox.com/cgi-bin/dcbint/cpindex.pl?scy=US&slg=AEN&cat=FLAT_TV_CA&sct=PLASMA_EXTRA_LARGE_GT43_SU&grp=TV_GR&session=20090801094721_71.214.152.68&ctn=50MF231D/37&mid=Link_Software&hlt=Link_Software

If that doesn't work, then since Magnavox makes this available as a consumer-level upgrade, my recommendation is to pressure Magnavox customer service to rectify the problem at no charge to you. In my opinion, if they manufactured a TV that required the firmware upgrade to correct defects, then they should be responsible if it doesn't work, whether it's under warranty or not. I have recommended this to others with the same problem in other brands and they have been successful in having the manufacturer service the TV at no charge. Let me know how this turns out.



Benjamin

Posted on Aug 01, 2009

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  • Master
  • 2,185 Answers

Hello,

Can you tell me the model and manufacturer of your TV?

This is from a good repair how-to website:

No picture or raster and no sound The screen is blank with no raster at all. There are indications that the channel numbers are changing in the display. This indicates that some of the low voltages are present but these may be derived from the standby supply. Assuming there is no deflection and no HV, you either have a low voltage power supply problem, bad startup circuit, or bad horizontal output transistor (HOT) or other bad parts in the horizontal deflection.
Check for bad fuses.
(If you have HV as indicated by static electricity on the front of the screen and you hear the high pitched whine of the horizontal deflection when it is turned on, then the following does not apply).

  1. Use an ohmmeter to test the HOT for shorts. If it is bad, look for open fusable resistors or other fuses you did not catch.
  2. Assuming it is good, measure the voltage on the collector-emitter of the HOT (this is safe if there is no deflection). You should see the B+ - probably between 100 and 150 V.
  3. If there is no voltage, you have a low voltage power supply problem and/or you have not found all the bad/open parts.
  4. If there is voltage and no deflection (no high pitched whine and no HV), you probably have a startup problem - all TVs need some kind of circuit to kick start the horizontal deflection until the auxiliary power outputs of the flyback are available. Some Zeniths use a simple multivibrator for this - a couple of transistors. Others power the horizontal osc. IC from a special line-derived voltage. The multivibrator type are sometimes designed to fail if someone keeps turning the set on and off (like kids playing) since the power rating is inadequate. Test the transistors if it is that type with an ohmmeter. If one is shorted, you have a problem. The usual way a TV service person would test for startup problems is to inject a signal to the base of the HOT of about 15.75 kHz. If the TV then starts and runs once this signal is removed, the diagnosis is confirmed. This is risky - you can blow things up if not careful (including yourself). See the section: Bypassing the Startup Circuit for details.
If you hear the high pitched whine of the deflection and/or feel some static on the scree, confirm that the horizontal deflection and high voltage are working by adjusting the SCREEN control (probably on the flyback). If you can get a raster then your problem is probably in the video or chroma circuits, not the deflection or high voltage.

Posted on Aug 01, 2009

  • virtualhost
    virtualhost Aug 01, 2009

    What you described indicates a problem in the power supply. There are
    capacitors that begin to malfunction and this causes the erratic
    behavior you described. You can take the back off the TV and locate the
    power supply board and inspect the capacitors on the board to see if
    they have indeed suffered a failure (this is usually denoted by the
    capacitors being bloated, and or puffy in appearance, and they could be
    leaking dielectric on the circuit board. I would suggest you letting a
    qualified TV technician repair the set for you, because the power
    supply may have caused other problems.

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