Samsung le40b750

[drpaparino]

Hi All,

My Samsung TV suffers from the flickering issue, which is curtailed if i decrease the backlight and brightness. Otherwise the screen turns black although it is switched on.

I have noticed a few others who have complained about the same problem but I cannot find a definitive solution or diagnosis.

I suppose the next part is to start testing, with a multimeter the separate electronic parts? Which is where i will need your help because i'm a complete novice

Can anyone give any advice on how to fix this please?

BTW - I can't post attachments. So, i have uploaded them here.

http://imgur.com/a/S6q0v

Thanks and appreciate any help

[drpaparino]

Re: Samsung le40b750

From the photos, i have three boards on the TV. I read on another post that we should check by unplugging the Main board. Which i believe to be the long ribbon connecting the two boards, located on opposite ends of the tv.

Consequently, this made the tv flicker with a blank screen. I could see at the back of the tv, it was trying to 'fire up' the leds.

What does this prove? Any suggestions please, much appreciated.

[drpaparino]

Re: Samsung le40b750

So i have reconnected the cable, powered the tv back on. Turned on the backlight and everything seems fine?! Is there something wrong with the LEDs?

Help much appreciated. Thanks

[drpaparino]

Re: Samsung le40b750

I am assuming that the problem will rise it's head again because i have not used the tv for several months and i have a feeling that the cable disconnection has only momentarily fixed the issue. Can anyone give any advice please?

[vlado66]

Re: Samsung le40b750

See weld lines in the source of power, especially power Fety

[drpaparino]

Re: Samsung le40b750



Any help please

[budm]

Re: Samsung le40b750

This TV uses CCFL for backlights, not LED backlights.
What is the PN of the owner supply/inverter combo board?
BN44-xxxxx?

[drpaparino]

Re: Samsung le40b750

Thanks Budm for your reply. I have been reading some of your treads to try to get a grasp on diagnosing this.

The PN for the inverter is BN44-00284A, Model H40F2_9HS.

The other board with the external connections is BN41 01167B

[drpaparino]

Re: Samsung le40b750

What do you suggest? Should I test the transformers? What about the CCFL tubes, can i somehow test to see if they work properly?

[truep]

Re: Samsung le40b750

Post pictures of the boards. There were some sets where cutting a jumper fixed the problem.