Question about Vizio Televison & Video

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Is there a way to test the output of the inverter board on a flat screen TV? Am I looking for voltage or frequency? What is the failure rate of inverter boards compared to backlights?

I have a Vizio VO22L FHDTV10A that lost the picture but still has sound. I can see an image on the screen with a flashlight, so I am guessing either the backlight or the inverter board has failed.

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6ya6ya
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Posted on Jan 02, 2017

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BoiseLCD
  • 63 Answers

SOURCE: I have a NS-LCD37-09 tv. No picture or backlight

Your main board is faulty. I've done several of these but haven't been able to figure out which component is actually bad these yet. I've simply had to replace the board itself, and it fixes it every time. One thing you can do to get your backlights to come on (and so you know I'm not Jive'n you) Is unplug the three wire bundle that spans from power supply to main board. This will usually make the backlights fire up. I even had one that after I left it that way for a minute (with the backlight on) it suddenly started working again! But this was short lived. :-(
One time I even tried recapping the entire main to see it that would fix it. It did not. I think it might be something to do with the small chip labeled SL37HA37. It's a 16 legged bastard near the 3-wire plug I told you to pull. It's that or possibly the bigger IC near it that has a heat sink on it. The ball grid array solder joints may be faulty. Just guesses, if any smart guys out there figure this one out, be sure to tell the rest of us please!
Thanks, Chris Boise LCD www.boiselcd.com

Posted on Apr 23, 2010

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budmrtn
  • 11361 Answers

SOURCE: 26" LCT HDTV Backlight Problem

It can be that the inverter is not getting the 24vdc fromt he power supply module, check for that first, you can check it at either the power supply termninals or at the inverter board. Look to see if the power supply has any leaking/bulging top caps. Modules are easy to replace, fixing it down to component level is not so easy unless you have proper tools an electronics knowledges.

Power supply and Inverter bd: http://www.shopjimmy.com/catalogsearch/result/?q=Vizio+VA26L+

Learn more here:
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net


Posted on Jun 14, 2010

Testimonial: "Thanks. I swapped out the inverter board for one that I know works, but still have the same proble. I'll look for indications of a bad power supply for the backlight."

budmrtn
  • 11361 Answers

SOURCE: I have an insignia NS-LCD37HD that has backlight

Chec to see if you are getting 12vdc at the T-CON board power input pin first.
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.

Posted on Oct 04, 2010

Testimonial: "So far so good! Almost got it figured out. Thanks!"

TV #1
  • 129 Answers

SOURCE: my 32" lcd vizio vx32L turns on there's sound

Have you tried the T-con board?

Thank you,


tv_1_7.jpg

Posted on Dec 18, 2010

  • 12 Answers

SOURCE: I have a vizio vz37l tv. When i turn it on the

its the main board...

Posted on Mar 07, 2011

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3 Answers

I have a protron 32 lcd tv turns on but no picture i have sound and can hear the channels change but no picture


You have a bad inverter board. See "Shop Jimmy" for your TV model. They will have a photo of the boards you may purchase. One of the best places to check. thanks for asking me.

Dec 07, 2011 | Protron PLTV-32 Television

Tip

Basic LCD Monitors troubleshooting guides


By Bud Martin
First if you can, try the monitor with other PC first to make sure it is not the PC problem.
Notes: We are dealing with high voltage that can kill you! so if you are not sure what you are doing, please have it fixed by the pro that has proper tools and safety equipment. Try to use GFI outlet and isolation transformer when work around the TV set and DO NOT DEFEAT THE GROUND PIN OF THE OUTLET/POWER CORD.

The monitor will have at least 2 circuits boards, one board will be the logic board where the video cable from PC is attached to, the second board used in most monitors today is the Power supply/backlight inverter board combinations. Some monitors will have separate power supply module and backlight inverter board.
The monitor should be connected to the running PC otherwise it will go into standby mode.
The operations of each board:

1) The Power supply board:
It takes the 120vac 60Hz and converts it to high voltage DC (around 160~170vdc filtered by the 80~150uf 250~450vdc cap) by the bridge rectifiers to be used by the switching power supply circuits that converts this DC voltage into high frequency (around 50~100 KHz) AC for driving the step down transformer. The outputs (usually 2 outputs) of the transformer will be rectified by the diodes to produce the regulated 5vdc for the logic board, and regulated 12~20vdc (12vdc is usually for screen up to 17inch, 16~24vdc for 18~24 inch screen).

The power supply circuits are always on (unless the monitor uses the power switch that actually disconnects the power from the outlet which is rarely used these days) which means that it is running 24/7 using the monitor or not, any spikes and surge will be fed into the monitor power supply.

Common problems:
Blown fuses, bad caps (leaking/bulging tops or bottom seals, please note that bad cap may look normal but it can have high ESR (Equivalent Series Resistance). The DC filter cap should be low ESR type for using in the switching power supply; general purpose electrolytic types will not last very long in switching power supply circuits. Poor solder joints, over heated components.

Testing:
Plug the monitor in but do not activate the power switch so the backlight inverter circuits will be off. Check the 5vdc and the 12~24vdc to make sure they are OK. They should be tested with the load, you can use 6V 1A (6watts) lamp for the 5vdc, and car lamps such as 1157 (12v 8watts lo/26watts high) turn signal brake lamp using high filament connection for testing the 12~18vdc (or use two 1157 in series for 19~24vdc) for the backlight inverter circuits.
If the power supplies are working, the output voltages should be steady at the rated voltages. The power supply will go into shut down if it detects too much current draw due to false in the power supply or short circuits in the backlight inverter or in the logic board.

2) The backlight inverter circuits:
It takes the 12~24vdc and converts it to high frequency AC to drive the inverter transformers CCFL (Cold Cathode Fluorescent Lamp) assemblies. The transformers will drive the CCFL by applying the start up voltage (around 1500~2000v), when the CCFL start conducting, the voltage will drop down to about 500~800v.
The inverter has detection circuits to detect open circuit if the lamp is not attached or does not fire up after the start up voltage is applied, it will go into shut down. It will also shut down if the lamps draw too much current due to ages (when lamp gets old it will draw more current).
The inverter gets two signals from the logic board, one is the backlight ON/OFF signal, the other one is the Dimming signal for the lamps.
Common problems:
Bad filter caps, resonant caps (in the inverter output circuits), blown transistors/IC, shorted or open transformer winding.
Testing:
You should have spare lamps for testing the inverter circuits.

3) Logic board:
The logic board get the signals from the VGA (ANALOG) or DVI (DIGITAL) and processes them and feed them to the LCD panel T-CON (Timing Controller) board on the back of the LCD panel.
It also sends out two signals (backlight ON/OFF and Dimming) to the inverter circuits when the monitor is on and getting the signals from the PC.
If the logic board does not get the signal from the PC, it will put monitor into standby mode.
The 5vdc feeding it is converted to 3.3v, 1.8vdc by the switching buck converters to run the processor.
The logic board also sends the 5vd or 12vdc power for the T-CON board, if the voltage is not there, you will see white/grey glowing screen only.
Not much repair you can do on the logic board unless you have the full service manual and surface mount repair station.

4) CCFL and Inverter circuits testing:
If you don not have the inverter and lamp tester boxes you may be able to do a simple test by using these steps:
If the screen flashes on for a second, you can disconnect all the lamp connectors and connect it into one of the transformer output connector and see if you will see the flash on the screen, if you do, then try it with another transformer output connector to see if it also get the flash on the screen.
Repeat the procedure with other 3 lamps. If all the lamps do flash on for seconds then more likely the lamps are OK. If lamp only flash on one of the transformer output then you will know that the problem in that transformer inverter circuits.
If none of the lamps flash at all then the problem is in the inverter circuits, power supply, or not getting the on signal from the logic board.

Bad caps
http://i.fixya.nethttp://i.fixya.nete17e9cc.jpg

Power supply/inverter board (L), Logic bd. (R)
http://i.fixya.nethttp://i.fixya.netbc19983.jpg'

Dead T-CON bd, blown fuse. Get glowing screen only.
http://i.fixya.nethttp://i.fixya.net4fbd9e1.jpg

T-CON board's fuse F101
http://i.fixya.nethttp://i.fixya.net8506e44.jpg

Inverter board surface mounted fuses, F1 and F2

http://i.fixya.nethttp://i.fixya.net1bf6596.jpg
Bad lamps (Blackened ends, burnt /poor soldering)

http://i.fixya.nethttp://i.fixya.net5c8952e.jpg

http://i.fixya.nethttp://i.fixya.net4e5e9a1.jpg

Bad LCD panel (solid vertical lines)

http://i.fixya.nethttp://i.fixya.netffe90fe.jpg

Bad LCD panel due to bad T-CON board
http://i.fixya.nethttp://i.fixya.netef48b18.jpg
Failed TV and Monitors:
http://s807.photobucket.com/albums/yy352/budm
http://en.wikipedia.org/wiki/Capacitor_plague
Make your own test lamps: http://www.badcaps.net/forum/showthread.php?t=19987

on Sep 25, 2010 | Computers & Internet

1 Answer

47LG50 screen light goes black after about 45 minutes of being on, sound still ok. Turn the tv off and back on and its fine for another 45 mins to an hour. The on/off light goes from red to blue-ish...


Good day!

That problem is commonly happens when the inverter board failed.

But before you replaced that its better to check this out first.

Just follow this simple and D.I.Y procedure on troubleshooting.

  1. Remove the back cover of your TV.
  2. Look for the Inverter board.
Inverter board looks like this:
nineng_6.jpg

3. Check the input voltage of the inverter board if have 24vdc.Using multimeter (range on DC)
4. If you have 24vdc,check the output voltage of the inverter board it should have 500vdc.
5. If you don't have 500vdc output on the inverter,replace it.
6. If the you have the output voltage on it,the problem could be the busted cold cathode light (C.C.T).Replace it.

I hope this solution will be helpful.Thank you and don't forget to rate my answer.

May 31, 2011 | Televison & Video

1 Answer

I I HAVE A philips 42pf5320/10 IT TURNS ON GREEN LIGHT IS ON BUT THERE IS NO BACK LIGHT, NO ONSCREEN DISPLAY, NO PICTURE.


Hi.

If your TV is LCD this are the procedure/steps to fix your problem.

Half picture on top of the screen, and the bottom half is black it means the back-light of your TV on the bottom is not working.


This are the step on how to find the trouble of your TV:

First, you have to remove the back cover of your TV to see the internal parts inside.

Secondly,after you open the back cover and the internal parts will reveal.Try to find where is the power supply board.It is usually connected to the power cord and it have a AC input that connects directly in you outlet.
It look like this:
nineng_4.jpg
This image is not exactly looks like your power supply because you don't indicate the brand name and model # of your TV.

Thirdly,plug-in the power cord then power it ON and be careful,check the output voltage of the power supply using a multimeter (range in DC) ,if it is have a 24vdc for the supply of inverter board.It is the board that gives a high voltage to the back-light of LCD TV.

Fourthly,if the power supply got the reading of 24vdc it means the power supply is good.Then try to check the input voltage of the inverter if it is have 24vdc.

The inverter looks like this:
nineng_5.jpg
This image is not exactly looks like your inverter board because you don't indicate the brand name and model # of your TV.

Fifthly, if the inverter have a input voltage please check the output voltage of it.It should have 500vdc so be careful to perform the voltage data in that point because it has a high voltage or hot area.

NOTE: if you don't have voltage reading on the input of the inverter board (24vdc) and the power supply an output of 24vdc,please check the wire that connect to each other.

Sixthly, If the inverter board have a reading of 500vdc on all outputs connectors (it is usually have 4 to 6 outputs).Your back-light lamp at the bottom are busted replaced it.
Or if your inverter board doesn't have a output voltage replace it.

You can buy the parts here:
Just click this direct link. http://www.electronica-usa.com/Merchant2/merchant.mvc?Screen=SFNT&Store_Code=EU

Or here:http://www.shopjimmy.com/

And also to eBay.com at your search engine.

Reminders:
If you don't have any basic knowledge about the electronics and testing equipment please don't attempt to do this steps.Its better to send it to the qualified technician or on the authorized service center of your TV.

If this solution will help you to fix your problem,please don't forget to vote and rate my answer.Thank you and good luck

May 08, 2011 | Televison & Video

1 Answer

My sanyo hdtv shows no pictures when you turn it on (the screen is black) but you can hear the audio. The remote control can change the channels and volume up&down but the picture won't show


Good day!


The problem of your TV could be the inverter board or the cold cathode light is busted.

Follow this instruction on how to fix that problem:

  1. Remove the back cover of your TV.
  2. Look for the Inverter board.
Inverter board looks like this:
nineng_6.jpg

3. Check the input voltage of the inverter board if have 24vdc.Using multimeter (range on DC)
4. If you have 24vdc,check the output voltage of the inverter board it should have 500vdc.
5. If you don't have 500vdc output on the inverter,replace it.
6. If the you have the output voltage on it,the problem could be the busted cold cathode light (C.C.T).Replace it.

I hope this solution will be helpful.Thank you and don't forget to rate my answer.

May 07, 2011 | Sanyo DP32648 32 in. LCD TV

1 Answer

Hitachi L26D103. Less than 2 years old. Working fine one day. Turned on the next day and the sound works, but not the picture. This is an issue when in both the TV and DVD modes.


Good day!

If your TV doesn't have a picture even you play a DVD it means there is problem to your TV.It could be the Inverter board or the cold cathode lights is busted.


This are the steps on how to fix that problem.
  1. Remove the back cover of your TV.
  2. After that,plug in the TV and power it ON to perform a voltage data.
  3. Check the the output voltage of your power supply by using multimeter tester (range in DC) then check the 24vdc(supply of inverter board).
  4. If you have 24vdc in power supply output,check also the input voltage of inverter board if have 24vdc.If doesn't check the wire connection from power supply to the inverter board.
  5. If have you input voltage of inverter then check the high voltage output of it,if have at least 500vdc so be careful to check it because it have a high voltage.
  6. If doesn't have high voltage output replace the inverter board and if have a output voltage the cold cathode lamp inside is busted so you have to replace it
The inverter board looks like this:
bugoy31_2.jpg


You can buy it to this link: http://www.shopjimmy.com/catalogsearch/result/?q=Hitachi+L26D103+inverter+board

If this solution will be helpful please rate my answer. Thank you and good luck.

May 06, 2011 | Hitachi L26D103 LCD TV

1 Answer

Half picture on top of the screen, and the bottom half is black


Hi.

If your TV is LCD this are the procedure/steps to fix your problem.

Half picture on top of the screen, and the bottom half is black it means the back-light of your TV on the bottom is not working.


This are the step on how to find the trouble of your TV:

First, you have to remove the back cover of your TV to see the internal parts inside.

Secondly,after you open the back cover and the internal parts will reveal.Try to find where is the power supply board.It is usually connected to the power cord and it have a AC input that connects directly in you outlet.
It look like this:
nineng_4.jpg
This image is not exactly looks like your power supply because you don't indicate the brand name and model # of your TV.

Thirdly,plug-in the power cord then power it ON and be careful,check the output voltage of the power supply using a multimeter (range in DC) ,if it is have a 24vdc for the supply of inverter board.It is the board that gives a high voltage to the back-light of LCD TV.

Fourthly,if the power supply got the reading of 24vdc it means the power supply is good.Then try to check the input voltage of the inverter if it is have 24vdc.

The inverter looks like this:
nineng_5.jpg
This image is not exactly looks like your inverter board because you don't indicate the brand name and model # of your TV.

Fifthly, if the inverter have a input voltage please check the output voltage of it.It should have 500vdc so be careful to perform the voltage data in that point because it has a high voltage or hot area.

NOTE: if you don't have voltage reading on the input of the inverter board (24vdc) and the power supply an output of 24vdc,please check the wire that connect to each other.

Sixthly, If the inverter board have a reading of 500vdc on all outputs connectors (it is usually have 4 to 6 outputs).Your back-light lamp at the bottom are busted replaced it.
Or if your inverter board doesn't have a output voltage replace it.

You can buy the parts here:
Just click this direct link. http://www.electronica-usa.com/Merchant2/merchant.mvc?Screen=SFNT&Store_Code=EU

Or here:http://www.shopjimmy.com/

And also to eBay.com at your search engine.

Reminders:
If you don't have any basic knowledge about the electronics and testing equipment please don't attempt to do this steps.Its better to send it to the qualified technician or on the authorized service center of your TV.

I hope this solution will helpful.Thank you and good luck.

May 01, 2011 | Televison & Video

1 Answer

Unplug TV will come on.cannot turn TV on


Hi, please chech does the screen of your TV lights up?during power on?if not then there might be a problem on the inverter board and the backlight lamp of the monitor .The lamp is a cold cathode bulb it requires a high voltage supply from the inverter board in order to light up.just like any other bulb this lamp has a limited life span more or less 2 years of continues lit.The inverter board is a high voltage board the power input of this board is 24volts DC and the output is 200volts AC.The terminal input of this board or connectors must be check because of high voltage corrosion and loose connections always happen that leads to the mal function of the display or screen failure just like what happen to your TV.
Backlight lamp is installed at the top and bottom of the screen you need to open the back cover of your TV to check up the lamp.(make sure to unplug the TV before proceeding)..check first the test point that I mentioned then post back for your findings then will proceed to further trouble shooting.
I hope this will be helpfull to you. GOOD LUCK!

Feb 02, 2011 | Sanyo Televison & Video

1 Answer

Half of the screen just went black! What's going on?


CCFL lamps, Slave inverter, or a scan problem on the Timing control board aka lcd-board. The interface board may also have a failure around the pre-scaler IC chip too and can cause a similar fault. Look in the back of the tv see if all the lamps are lit-up from right to left. If their all lit-up from right to left then the LCD-Board has data input/output problem. Get someone to remove the back cover and get a multi-meter and I can show them some very basic test procedures. Get back too me when you can...

Please rate this answer :-)

Dec 05, 2009 | Dynex 32 in. LCD Flat-Panel HDTV

1 Answer

Emerson lc320em82s need help checking inverters


OK,
1. On the power inverter board unplug all 6 wires that go to the LCD screen.
2. Test each of those ports for resistance.( the one without the resistance is the bad one.)
3. Or, test each port for Voltage output ( this will happen very briefly since the TV will turn itself off automatically).( The one without voltage will be the bad one).

Mar 21, 2009 | Emerson LC320EM8 32 in. LCD TV

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