Brand: Samsung 460UXN-3 LCD TV Model: LH46GWSLBC/ZA Size: 46" Inch I need some help fixing my TV i have here. When you power on the TV the backlight flashes on for 1-2 sec, each time you change inputs it will flash again for 1-2 seconds again. Then after about 30sec the tv will power off completely. So the power board all looks fine visually and I tested all the voltages on the connectors with a multimeter they are correct. I removed the Inverter board and the TV would stay on and not power off after a few seconds. With the inverter board removed the tv is working i can use a flashlight against the screen and see the picture. So i figured ok needs a new inverter board, i finaly recived a new one that i ordered online (SS1460_12C01), installed and the same thing. Tv no longer powers off after 30 sec, but still only flashes backlight for 1-2 seconds. so am i right to assume its the backlight bulbs themselfs? is there a way i can test the bulbs? also can i simply disable the bad bulb once i figure out witch one? id rather not take apart the LCD and risk damaging it completely.
Hi Cool,
Please disconnect the bulbs number one and solder a 4200pf/2kv capacitor in its place. See if the set works. Do the same for all the bulbs till you find the defective one. With the defective bulb replaced with 4200pf capacitor set will not power off. If this works and the light on the screen is sufficient, you can leave the capacitor soldered there. I hope it helps.
Good luck.
here are images of the inside. seems from the inverter their is only one input for each bulb but noting on other side of the TV so are the bulbs paired together in series?
i dont want to take apart the layers of the LCD itself so what can i do from the back of the TV board side? where would i wire in the capacitors on my board?
http://s102.photobucket.com/user/coolshr...
could i stick tape over the contact that goes into the bulb connector? one at a time and find the bad bulb or is it that no voltage is flowing because the bad bulb and that triggers it to not stay on?
Sorry, difficult to do in this case.
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SOURCE: Insignia NS-32LCD Backlight or Inverter bad???
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.
SOURCE: Bad backlight inverter on 42" RCA LCD
Does the backllght go out after a few seconds? Could still be a lamp or something else on the inverter boards. You could try used inverter boards from the same set with other problems (broken screen), Or a complete working backlight from another set but very delicate operation to swap the LCD display from one panel to another.
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
SOURCE: I have a Samsung ln
I have a 46" Samsung LNT4665 with the same problem. Originally had the power supply replaced but 1 day later I have this problem. Auth. repair shop says it's likely inverter, but apparently can't be replaced separately, must be replaced with panel ($700 , and labour on top) might as well buy a new TV.
Any suggestions? I have seen the inverter sold separetly on some websites, anybody try replacing that part?
SOURCE: I have Sharp Aquos LC-65D64U
It sounds like a backlight inverter to me. I am 99% sure. The buzzing noise you mentioned kind of confirms that, so does the backlight turning off. If you want to test them, then you are gonna need a multimeter. I will see if I can find a schematic in my collection, but be aware that this is a highvoltage device we are dealing with. May not be a good idea to test it yourself if you have never worked on electronics before. The sets hold nasty voltages for several days after its turned off and unplugged, and can injure you if you are not careful. I don't mean to scare you but its my job to tell you. If you want to proceed then I'm game.
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