I have a Samsung LNT3253H. When I turn it on it shows the screen for about 10 seconds then goes black. I can barely see the outline of whatever is broadcast on the screen but that's it. Audio still works. Neighbor gave me the tv since he was moving so if I can fix inexpensively that would be great Thanks much.

Hello Back2Life .
So I replaced the backlight inverter and it still turned off only with this new part it turned off in a second. When the original BL was installed it stayed on for ten seconds. The screen is completely black. no faint outline even when I flashed a light behind it.
I checked the caps and one had black on top of it without much of a bulge so I replaced it.

You said previously that there could be a problem with the 24vdc circuit on the power supply board. It could also be that the "BL ON" signal is dropping out after 10 seconds. But from your experience it's mostly the backlight inverter."
I'm returning the part to shop jimmy and will exchange it for whatever will fix it.
So what is would you do now?
Thanks Timebandit 777 Hello Back2Life . So I replaced the backlight inverter and it still turned off only with this new part it turned off in a second. When the original BL was installed it stayed on for ten seconds. The screen is completely black. no faint outline even when I flashed a light behind it. I checked the caps and one had black on top of it without much of a bulge so I replaced it. You said previously that there could be a problem with the 24vdc circuit on the power supply board. It could also be that the "BL ON" signal is dropping out after 10 seconds. But from your experience it's mostly the backlight inverter." I'm returning the part to shop jimmy and will exchange it for whatever will fix it. So what is would you do now? Thanks Timebandit 777

Do you have a multimeter?? Do you have a multimeter??

I have access to a meter. What do I do next?
Thanks I have access to a meter. What do I do next? Thanks

let me backup a bit, when you bought the replacement inverter, did it have the same part # as the old board?? this is very important. Many times there are various boards for the same tv model # ??? let me backup a bit, when you bought the replacement inverter, did it have the same part # as the old board?? this is very important. Many times there are various boards for the same tv model # ???

It was the correct replacement. That board can be used on different tv.s I didn't compare the part number on the two boards .Duh! Shop jimmy is sending another board and should have in two days.I will check the next time. So could that be the reason for it not even working as well as the original board? It worked for a second, where the original board held up for 10 seconds? I will let you know what happens when I get the part. Moving forward if this doesn't resolve the issue I was told to look at the 24vdc circuit on the power board. Not exactly clear on the best path to take. Thanks It was the correct replacement. That board can be used on different tv.s I didn't compare the part number on the two boards .Duh! Shop jimmy is sending another board and should have in two days.I will check the next time. So could that be the reason for it not even working as well as the original board? It worked for a second, where the original board held up for 10 seconds? I will let you know what happens when I get the part. Moving forward if this doesn't resolve the issue I was told to look at the 24vdc circuit on the power board. Not exactly clear on the best path to take. Thanks

So Shop Jimmy sent another blacklight inverter so now I know twice over that it ISN'T an inverter problem. The new part was an exact match, even the rev # matched. If it is a problem with the 24vdc circuit on the board should I replace the power board instead of fixing a part on the board? And what part on the board would I replace? Anyway thanks for all of your advice. So Shop Jimmy sent another blacklight inverter so now I know twice over that it ISN'T an inverter problem. The new part was an exact match, even the rev # matched. If it is a problem with the 24vdc circuit on the board should I replace the power board instead of fixing a part on the board? And what part on the board would I replace? Anyway thanks for all of your advice.

I think I'm going to just buy a new power board since I can't find out anything out about the 24vdc circuit . Thanks I think I'm going to just buy a new power board since I can't find out anything out about the 24vdc circuit . Thanks

ok so if both inverters didn't work we can rule the inverter out. If the problem is with the 24v circuit, unless you have techical training, it would make sense to just replace the power board. But do you have a meter to verify that you're getting or not getting the 24v? Sorry it's taken so long to respond, been tied up. It could be the power board but it could also be the main board as it puts out a 3.3v-5v BL_ON signal that enables the inverter circuit. Are there any labels next to the connectors for example "5vdc" "GND" "24vdc" ok so if both inverters didn't work we can rule the inverter out. If the problem is with the 24v circuit, unless you have techical training, it would make sense to just replace the power board. But do you have a meter to verify that you're getting or not getting the 24v? Sorry it's taken so long to respond, been tied up. It could be the power board but it could also be the main board as it puts out a 3.3v-5v BL_ON signal that enables the inverter circuit. Are there any labels next to the connectors for example "5vdc" "GND" "24vdc"

Hi Again. Well I replaced the power board with a brand new board and got "Exactly" the same result. The t.v. powers up, shows a beautiful picture for 8 to 10 seconds then goes black. Plays the audio perfectly. So I put in the original power board and the t.v. did the same again. My conclusions are:
1. It isn't a Black light converter, since I tried two of those to make sure.
2. The power board is fine.
So if I remember correctly the main board puts out a 3.3v-5v BL_ON signal.
Can the board be fixed or do I have to replace it? Anyway there isn't much left to troubleshoot so maybe I'll just get another t.v. since the board is about $150.
So What would you do next?
Thanks. Hi Again. Well I replaced the power board with a brand new board and got "Exactly" the same result. The t.v. powers up, shows a beautiful picture for 8 to 10 seconds then goes black. Plays the audio perfectly. So I put in the original power board and the t.v. did the same again. My conclusions are: 1. It isn't a Black light converter, since I tried two of those to make sure. 2. The power board is fine. So if I remember correctly the main board puts out a 3.3v-5v BL_ON signal. Can the board be fixed or do I have to replace it? Anyway there isn't much left to troubleshoot so maybe I'll just get another t.v. since the board is about $150. So What would you do next? Thanks.