Re: Samsung LE46C750 TV, dead but backlight on.
The problem was a bad main board. Got a second hand one and all works fine now.
I do have another problem that I didn't see before.
The main chip has a large thermal pad between the back of the board/chip and the main metal frame of the TV chassis. The pad has some kind of sticky oil leaking from it and running down the chassis.
Does this pad need replacing?
I have never seen this before.
Some pics of the thermal pad after being cleaned up.
Size seems to...
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Re: Samsung LE46C750 TV, dead but backlight on.
Might of found a replacement main board. Just waiting for a reply from them.
The chip that needs heating up on my old board to try and reflow. Is it the one with the metal case over the top?
Just taken the heatsink off very easy, because all the adhesive was dried up solid. I do have a hot air station....Last edited by Andy A; 02-17-2022, 10:04 AM.
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Re: Samsung LE46C750 TV, dead but backlight on.
Disconnected power board and backlight is nice and bright.
I will take out the power board tomorrow when the lighting is better in here and have a good look around for any dry/cracked solder joints.
All the caps look fine.
Is this all pointing back to a power board problem and not a main board problem?...
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Re: Samsung LE46C750 TV, dead but backlight on.
[QUOTE=dskall;1109839]I would say a mainboard issue. You could try heating main chip and see if that changes anything, but unless you are experienced with testing voltages and know if they are correct. I would say replace mainboard.
Is the main chip under the black heatsink that is just below the silver one?
What is the heatsink stuck on with?
If yes I will get the heat gun on it tomorrow.Re: Samsung LE46C750 TV, dead but backlight on.
[QUOTE=dskall;1109839]I would say a mainboard
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Re: Samsung LE46C750 TV, dead but backlight on.
Very good advice. Here are some more pics.
[ATTACH]256530[/ATTACH]
[ATTACH]256531[/ATTACH]
[ATTACH]256532[/ATTACH]
[ATTACH]256533[/ATTACH]
[ATTACH]256534[/ATTACH]
Hope this helps.
ThanksRe: Samsung LE46C750 TV, dead but backlight on.
Very good advice. Here are some more pics.
[ATTACH]256530[/ATTACH]
[ATTACH]256531[/ATTACH]
[ATTACH]256532[/ATTACH]
[ATTACH]256533[/ATTACH]...
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Samsung LE46C750 TV, dead but backlight on.
I have a Samsung LE46C750 TV
There are no LED'S lit on the front panel of the TV when powered up.
When powered is supplied to the TV the backlight comes on, no sound and no picture.
I cannot see any sign of damage to any of the components on the main logic board (BN41-0142 B) or the power supply board (BN44-00341A)
I have tested the voltages from the power board to the main logic board and all voltages are correct except one.
[ATTACH]256522[/ATTACH]
[ATTACH]256523[/ATTACH]
Pin 18 PS_ON reads 0.8V...
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Re: New Members - please post your introductions here
Hi all,
I am a keen learner and have been doing some small amounts of electronics. Simple stuff really and want to learn a lot more.
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