Question about Televison & Video

2 Answers

At start the picture is coming for 1 second en then screen is black and the sond is OK. What can it be?

Posted by on

  • fijitechnic Sep 24, 2009

    Sorry it is the first time i send a question...



    The model is Samsung LE 32 S 71 BX/XEC, version PP08.



    Thank's for your help.





    FiJi

  • fijitechnic Sep 25, 2009

    I checked and the back light turn on for half second only! and then no picture and the son is ok. I'm a technicien, are you sure that it is the back light bord? and dou you now if I can fix the bord?

    Thank for your help

    Regards
    Fiji

×

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 19,396 Answers

The part that is faulty is called Inverter Board.
The inverter board is an high voltage board that gets DC power from Digital Controller Board (main board inside your LCD), and supplies AC voltage to the backlight lamp system.
If you are a technician, then you can test the inverter reading voltages in on wiring harness to digital board (CN 803-804 on service manual), and reading high voltages out (set multimeter to AC) on inverter output to backlight system (lamps). Digital board is the main board inside the LCD TV. For safety reasons this tests must not be done by not trained users.
Here inverter PSU (CN803) connector Pinout on mainboard, and also Conn 804 is still inverter, it is power to inverter from main board:
Pins 1, 2, 3 ,4 5: +24V Pin 6,7,8,9,10 : GND
test 1 , 4, and 5 , 2 and 3 are analogic dim.
You will find out that there is no power to the lamp.
If there is no volts on inverter input connector, on digital board, Then digital controller board is faulty, but this is rare and unusual (read volts on board connector pins, not wiring harness).
Usually the problem is the faulty inverter.
To test the inverter completely you will need an oscilloscope. Normally the inverter is not serviced at component level, but just replaced straight away.
An inverter convert DC to AC using a set of oscilloscopes, when one of them is faulty, or one of the capacitors on inverter board is defective, the inverter may come on for one second and then fail.
If you want to test the inverter at component level, then you will need the Service Manual. You can download service manual with full schematics here: Download.
Let me know if you have more questions , and please do not forget to leave feedback.
Many thanks.


Posted on Sep 25, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 10,594 Answers

Model number and brand name is required to understand what kind of TV you have and what might be wrong in it causing that problem.
Let me know model and brand of TV to provide you helpful info.
Thanks.

Posted on Sep 24, 2009

  • Shahid Electronics
    Shahid Electronics Sep 24, 2009

    Thanks for model info.
    Please check at back of TV that white light comes from any tiny ventilation slots/ holes when TV screen becomes black/ blank.
    Apparently it seems back light failure and can be confirmed by above said method.
    If there is no white light comes from said any slots then TV needs back light inverter board replacement and it is qualified tech job to do so.
    Thanks.



×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

I have a Kodak M850 Easy Share hooked up to my television with an mini HDMI cable. The picture shows nicely but I don't know what camera button to use to make a slide show appear on the tv. Can you help?


Starting the slide show

  1. Press the Review button, then press the Menu button.
  2. Move autourg00422004id1197998.jpg to highlight Slide Show [img src="http://resources.kodak.com/support/jpg/en/manuals/GLB_en_urg_00422_images/autourg00422004ID1198002.jpg" alt="">, then press the OK button.
  3. Move autourg00422004id1198023.jpg to highlight your option, then press the OK button.

Mar 18, 2014 | Kodak Cameras

1 Answer

RCA M50WH92S PICTURE COMES ON FOR ABOUT TEN


Replace your LAMP if all of your Fans are running! If lamp fan is not running Lamp will not turn on .Call FOX for Lamp 1-800-227-5369

Jun 20, 2011 | RCA Televison & Video

2 Answers

Monitor picture comes on for only 1 second and then it is blank (black) Color bars appear to be OK (for that second) when running the Self-diagnosis function.


timothy henr, Do you understand how the new screw-in, curlie-Q, energy efficient, CFL light bulbs generate white light?? You will when you find out just what makes the WHITE fixya background on this web page you are looking at!!! Black screen of death can strike at any time!! Do a reply when finished with your research of repair video clips at YOUTUBE. Your search terms are: "lcd monitor disassembly" and "lcd monitor repair." That should get you started. Your unit could have a "switch-mode-power-supply" that detects a problem with itself or another circuit and goes into "full" or "partial" shutdown mode. You should be able to tell the difference if you shine a bright flashlight 1 inch from screen when it goes black!! Partial=still see win-desktop. Full shutdown=no see desktop!!! What wil you do??? Fix or just trade up for new display?? 12fixlouie

Oct 15, 2010 | Sony SDM-HX73 17" Flat Panel LCD Monitor

1 Answer

Powers on for about a second but nothing comes on, only a black screen but i can tell the backlight is on, then it powers right back off. i need the schematics, anyone know where to find them?


So you are getting gray glowing screen without the pictures? Sound OK?<br /> <span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><a href="http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide">http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide</a></span><br /> <span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> </span><br /> <span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><a href="http://s807.photobucket.com/home/budm/allalbums">http://s807.photobucket.com/home/budm/allalbums</a></span><br /> <span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"> </span><br /> <span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><a href="http://en.wikipedia.org/wiki/Capacitor_plague">http://en.wikipedia.org/wiki/Capacitor_plague</a></span><br /> <span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"> </span><br /> <span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">Parts: <a href="http://www.shopjimmy.com/">www.shopjimmy.com</a></span><br /><span style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">Capacitors kit: <a href="http://lcdalternatives.auctivacommerce.com/Viewsonic-C196320.aspx"><span style="mso-spacerun: yes"> </span>http://lcdalternatives.auctivacommerce.com/Default.aspx</a> he can make you a set of caps.</span>

Aug 25, 2010 | Toymax Magnavox 37MF231D 37 in. LCD TV

1 Answer

SOUND AND NO PICTURE ON DELL PLASMA W4201


Y SUS and Buffers are usual culprit.
You can get it from guy at
plasmatech@gmail.com
He has everything for Dell TVs

Jul 29, 2009 | Dell W4201C 42 in. Plasma HDTV

1 Answer

Picture comes on for 2 seconds then tuns to black screen Sound ok


Hi!

This more then likely a back light inverter board issue! It can be intermittent or just black an non responsive.

Feb 18, 2009 | Televison & Video

1 Answer

I loose picture on my big screen


bad voltage regulator - BA09FP requires a bit of tech experience to replace, but its relatively easy. It took me about 1 hour to replace mine. If you need clarification on this, email me at Doin12volt at yahoo

Jul 03, 2008 | Mitsubishi WS-65513 65" Rear Projection...

Not finding what you are looking for?
Televison & Video Logo

Related Topics:

77 people viewed this question

Ask a Question

Usually answered in minutes!

Top Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74106 Answers

Cindy Wells

Level 3 Expert

5099 Answers

Electro Med Services...
Electro Med Services...

Level 3 Expert

6694 Answers

Are you a Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...