Question about Insignia IS-LCDTV32 32 in. Television

2 Answers

Insignia NS-32LCD Backlight or Inverter bad???

My TV had been working fine without a problem.  I walked out of my room with the TV running one night and came back to no picture just the blue insignia light on.  The Insignia Logo will be red, I then power it on and it goes blue like normal.  I did the flash light test and did see picture on the screen.  So I know it has something to do with the backlight or the inverter.  Do you guys think it is a failed backlight inverter?  Would this also cause the sound not work?
Thanks

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  • mbdawson Aug 21, 2008

    Ok I found where the inverter board plugs into power supply.  It was a 8 pin connector.  The 8 pins were split into 2.  The left side said 24V the other side said GND.  I touched my multimeter positive to a pin on the 24V side and the negative to GND side and nothing.  Could not find any voltage.  Well now this could be a power supply unit problem.

  • Anonymous Mar 30, 2014

    backlight flickering

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  • Master
  • 2,296 Answers

If you've done the flash light test, it could be the inverter board became defective but it could also be that the power supply does not provide the +24VDC to the back light inverter board.
If you could do the +24VDC test using a voltmeter then we can say for sure that the back light inverter board is defective.
Let me know if you need further assistance.

Posted on Aug 21, 2008

  • Jaime Hernandez Aug 21, 2008

    Both circuits are using independent voltages. The back inverter board uses +24VDC and the audio circuit uses 12VDC. If the 12VDC are missing, you will not have audio. If the voltage is there, then there's an audio amplifier IC failure.

  • Jaime Hernandez Aug 21, 2008

    There should be 2 pico fuses on the secondary side of the power supply circuit. One for the 24VDC and the other one for the 12VDC line.

×

The only thing that troubles me is the no sound part. Would a failed inverter board not allow sound?

Posted on Aug 21, 2008

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This one in the pictures has sound and backlight but no pictures due to bad T-CON Bd.
Pictures: http://s807.photobucket.com/albums/yy352/budm/Insignia%20NS-LCD37HD-09/

You need to find out if it has backlight or not so we can figure out if it is power supply, T-CON bd, or backlight inverter board.
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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
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm

Learn about bad caps: 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.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
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Chec to see if you are getting 12vdc at the T-CON board power input pin first.
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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.

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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

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

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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

http://s807.photobucket.com/home/budm/allalbums

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

Parts: www.shopjimmy.com

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

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if not and you like to repair yourself the folks at www.partstore.com will help you find the part and replace it give them a try if all else fails.

You may want to chat with us about this also only $12.99 one time chat could save you hundreds

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