Looks as though backlights are working but when I try to adjust backlight through menu, It will only allow it to a max of 50 not 100 as the other features such as brightness, contrast etc.
LEDs are lights there are no backlights, so either the leds aren't getting enough juice or they themselves are toast.
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.
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SOURCE: I have no picture on my Sanyo Dp32746 LCD tv, the
U replaced the 1 or 2 LCD inverter long boards,still the same problems.Sorry,this is a rare problems,but it seem the Tuner board is the problems.Replaced the Tuner board,will solved this problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish Tuner signal board for the replacement.
SOURCE: I have a insignia ns-lcd37
Its 100% sure that the source of the problem is the backlight inverter board. The fact that there is no backlight confirms this. You will need to replace the backlight inverter board to resolve this problem. If you can get me the part number off the same I can find you a replacement
Sounds like T'Con board fault. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Shine a flashlight on the screen while the TV is on. If you see movement then the Inverters are gone. If you don't get a dim picture then the T-con board is bad. You can get parts here: TV Parts Universal TV Stands DLP Chips ShopJimmy
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Only getting 11 VDC to my meter.
11 VDC on T-con board
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