Question about Dynex Televison & Video

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40 inch Dynex LCD no pic no sound. I get backlight and video for about 1 second approx. 5 seconds after pwr up, then black screen. Help!

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  • Dynex Master
  • 73,698 Answers

Fault with its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. 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/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Posted on Dec 02, 2014

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Posted on Jan 02, 2017

Adolph
  • 137 Answers

SOURCE: Blue screen for a second after power on and then black screen again

Check where your plug go's in to your powersupply if it is well fitted. ////sometimes it dosnt make well connection then you will struggle to get it on.

Posted on Dec 22, 2007

SOURCE: Complete black screen on samsung 46 inches

Thats Samsung for you. They are designed to last just right outside the warranty then fail. Typically the LCD panels are bad, and they are the most expensive part on that Korean unit.

Posted on Oct 07, 2008

  • 927 Answers

SOURCE: Samsung LCD 40 inch LNT4061

Howdy,
It sounds like you have a Power Supply Board problem. The PSB is the center Board (towards left) after you remove the back off the TV. Remove Board from TV with the 6-7 screws. Replace capacitors CM852 & CM853; 2200ufd 25volts.

Thanks for using FIXYA, big IRISH.

Posted on Jan 02, 2010

  • 308 Answers

SOURCE: 20" lg LCD backlight turns off after about 5 seconds of use.

First, check the power supply for the backlight. It's usually a 24 volt supply. Look for swollen caps. If that is ok, go to the inverter board and inspect for damage, ohm out the inverter transformers. Last is to test out the lamps seperately with an external inverter. If a lamp goes out this way, it is bad and causing the whole backlight to go out.

Posted on Apr 14, 2010

tvhelp-Dave
  • 178 Answers

SOURCE: sanyo 42 inch lcd dp42647 - turns on, video audio pulse on off

Need s to be replaced the main board.

Posted on Apr 17, 2010

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Does it turn black after about 10-15 seconds? My 40" Viore had the same problem. After trial and error, I finally fixed the problem. There is a motherboard with a cable wire coming from one end to another motherboard. 3 wires. If you remove this wire and kind of jiggle it it in, barely touching the contact points, you will see the image stay on longer than 15 seconds. You have to cut one of the wires on the board with all the inputs, VGA, HDMI, power cord, etc. I have taken pics but have not taken them out of the camera yet. If interested, post back here and I'll (hopefully) get them out. But a word of caution: my 40" inch TV motherboard may be different than your 32" inch.

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HelloCheck the backlight inverter board. If it has damged, most common fault to LCD TVs, there will be no backlight to the LCD screen, and will look black. Your tV has sound output without picture. This means that all other boards ar functioning well. Check the backlight inverter section and CCFL tubes used in backlight assembly. OK.

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Test: You might see a pic by shining a bright light against the screen. (Halogen can burn a spot if too close for too long like 15 seconds). If so, you probably have an inverter, backlight tube or coil/driver board problem. Some of thse units have a bad ground on the tube driver coil board which can be shimmed and/or tightened. Sometimes a simple car light tester (continuity tester with a 12v bulb) from casing/mount ground to any of the - side of the backlight driver coils will light the screen and reveal which tube is non functional. I leave one dome light running in such ground position one of my TVs at all times for regulation and night dimming.

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1 Answer

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Test: You might see a pic by shining a bright light against the screen. (Halogen can burn a spot if too close for too long like 15 seconds). If so, you probably have an inverter, backlight tube or coil/driver board problem. Some of these units have a bad ground on the tube driver coil board which can be shimmed and/or tightened. Sometimes a simple car light tester (continuity tester with a 12v bulb) from casing/mount ground to any of the - side of the backlight driver coils will light the screen and reveal if and which tube is non functional. I leave one dome light running in such ground position one of my TVs at all times for regulation and night dimming.

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1 Answer

I have a 26 inch Dynex LCD HDTV that the picture fails to work most of the time. On occasion it will work fine while the rest of the time there is sound with no picture only a black screen. I assume this...


Test: You might see a pic by shining a bright light against the screen. (Halogen can burn a spot if too close for too long like 15 seconds). If so, you probably have an inverter, backlight tube or coil/driver board problem. Some of these units have a bad ground on the tube driver coil board which can be shimmed and/or tightened. Sometimes a simple car light tester (continuity tester with a 12v bulb) from casing/mount ground to any of the - side of the backlight driver coils will light the screen and reveal if and which tube is non functional. I leave one dome light running in such ground position one of my TVs at all times for regulation and night dimming.

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While watching it, the screen went black (totally). Sound was still there but no pic. When I tried a different channel to see if it was cable or tv, it shut off. Now the green light will come on and the...


The tv have a long board call a LCD inverter board.This LCD long inverter board,it dead.This long LCD inverter board,help the LCD screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish long LCD inverter board for the replacement.

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1 Answer

T.v.powers up, sound but no pic. t.v. is only 3 months old.


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Ur LCD inverter backlight board is dead.Replaced this LCD inverter backlight board,will get picture back.Tries these websites Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter backlight board for the replacement.It a long board in shape.

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http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find.

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Samsung monitor picture clicks off after 2-5 seconds...


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Buddy


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