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MAGNAVOX MODEL 42MF231D TURN UNIT ON BLUE POWER LIGHT COMES ON HAS NO PICTURE VA & VS VOLTAGES CKED OK

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Sounds like a bad logic board, you say you have checked the voltages? I assume you mean inside the unit on the logic controller? Most of the time the problem you describe is due to a bad power supply but since you mentioned about voltages the only real option left is a failed logic board.

If you are looking in the system look around and get the model number off the main board inside. I can check how available it is and whether or not it's worth repairing.

Also, I take it you are certain you are out of warranty?

Thanks

Posted on Jul 15, 2009

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Power but no picture black screen


You should start for the Vs & Va voltages itself. The details to these voltages will be marked on the panel label itself. These two voltages should be more specific than other voltages, especially to Plasma displays. More variations; say; + or - 1%, can effect the display drastically. To get more details about this, you have to download the repair manual to this set, and refer its schematic diagram. If you wish to get some details, check the site linked here. http://electronicshelponline.blogspot.com/ Pull up older posts.

Dec 25, 2013 | Televison & Video

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My power will not turn off and the blue light stays on. I get no picture or sound. PLEASE HELP!!!


First of all you have to check the Va - 60V and Vs - 80V voltages at the power supply point. If any one of the voltage is missinig there are two possiblities for that. One is the power supply itself and the second one is the sacn drive modules for X and Y. If the scan drive modules are faulty then the or short then the Va Ans Vs voltage from the power supply will drops.you have to measure using a multimeter is there is any short circuit in its power supply in put point. When the voltages from Va and Vs point are missing then this will indicated by the blinking of power light. To rectify the problem you need a good knowledge in electronics. Aslo need the necessary equipments for measuring the voltage at different points

Nov 10, 2011 | Hitachi P50T501 50 in. Plasma HDTV

1 Answer

Hitachi Plasma model P50V701 - press the POWER button, display lights go from standby-red, to Power-blue to blinking blue and the sound and picture appear for about 2 seconds. have tried unplugging and...


(Green Power LED will go Green the Go Off) Brief rise then collapse of the Vs and Va voltages.

This indicates a "Load" on the line.

Pull the CN-64 connector feeding Vs/Va voltages to the X-SUS.

Take an ohmage reading from the Va and Vs lines on each PWB.

This means you have to read the Connector on the Power Supply and the pulled connector going to the X-SUS.

See if there is a low value. Low value indicates a defective PWB.

Normal reading should be infinity. (Using the diode mode on the DV/Voltmeter, there will be a brief charge

time, then infinity.) In other words, it may appear as a low ohm reading, but should rise to infinity or open.

(Also not, if there is a charge on the line, the meter may show a low. You must Pull the CN68 connector and take

a reading again).

The line should now be infinity when reading the Power supply pins for Va and Vs and when reading the

connector going to the X-SUS PWB.)
If a Low is see on the connector, pull the CN32 Connector. (Bottom right hand plug on the Y-SUS PWB)

Jan 12, 2011 | Hitachi P50V701 TV

1 Answer

My Magnavox 42MF231D 42" T.V


You may have a weak power supply. This would indicate one or two capacitors that are weak or bad. This model may be about 4 years now and this is a good indicator as these capacitors need replacing. The other problem may be the infared board in the TV that receives the signal from the remote may be a problem as well. I would certainly investigate my first thought. The latter is kind of rare. Thanks for asking and show a few hands of support.

Nov 29, 2010 | SNK Magnavox 42MF231D 42 in. Plasma TV

1 Answer

Akai 42' flatscreen i turn the power on the green indicator lights up and in i hear a click but i dont get a picture no other functions work such as volume,input,or channel buttons. is it my main board or...


On the power supply board there is a VA & VS voltage that you need to check to see if they are reading right. On the inside of the panel there is a lable that will tell you what the Voltages should be for VA & VS. If they are ok, they you probabaly have a bad Y board, if the votages are wrong then you need to replace the power supply. And check for bulged caps on power supply too.

Oct 14, 2010 | Akai PDP42Z5TA 42 in. Plasma Television

1 Answer

42 in magnavox plasma tv has sound with no picture I unplugged tv and waited 10 minutes with no luck


Hi my name is Roety,
I can help you with your issue ,
If you have no TV menu either check for any swollen capacitors on the power supply.
If none are found measuring voltages will localize the defective board or boards the voltage test points are marked VA and VS on the panel and boards.
If disconnecting boards restores these voltages the suspected boards must be replaced .
Tech labor is about $250 plus parts.
Suspected boards
power supply
Y sus main & Y buffers  
Logic board
mainboard
panel
 
 
If I have helped you with your issue
If you have more questions you can still respond
I will reply asap
Thanks

Dec 30, 2009 | HP PL4245N 42 in. HD-Ready Plasma...

1 Answer

42'' Magnavox 42MF231D/17 with picture/sound problem


Hi my name is Roety,
I can help you with your issue ,
Sounds like a bad SSB small signal board
login as a guest and check price and availability at
encompass.com  
 
 
If I have helped you with your issue please click accept.
If you have more questions you can still respond until this post expires,
I will reply asap
Thanks

Oct 31, 2009 | Philips Magnavox 42MF521D/37 Television

1 Answer

Picture gone on an LG 42pc1dv-ec plasma. Sound OK, inputs OK. Vs fuse blown on y-sus board. Replaced fuse but still no pic. Checked d.c voltages from PSU. When switched on from cold Vs>300 and Va>80....


Your Vs voltage is high, check if the heatsinks on the Z-sustain board are getting hot after a short time, if so replace the Z-sustain board. If not, dis-connect the Vs & Va plug connection to the Y-sustain & check if the voltages are normal (185V & 80V). If they are then your fault will be in the Y-sustain board. There is a possibility the control board (sits below the power supply) could also be a problem as it is not able to initiate the control to the sustain boards.

Oct 11, 2009 | LG 42PC3D 42 in. Plasma Television

1 Answer

42 plasma tv model42mf230a/37 blue light on no picture no sound


with solid blue led set could be still powering on but would need to verify by checking power supply voltages. if up and signal is present with no menu or audio would be ssb as audio amplifier, micro processor and eeprom are on that board. if voltages are not present you need to offload x and y sustain boards one at a time from power supply and check voltages and if vs comes up with either board disconnected replace that board

Jul 25, 2008 | Philips Magnavox 42MF521D/37 Television

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