Samsung 46" 6500 LED backlight issue

[se.hartmann]

Greetings!

We have a 46" Samsung 6500 LED TV that I have just noticed one of the lamps appears to be out on it. There is a shadow on the bottom of the TV, roughly 1/4 the total length of the screen. The unit is under warranty, so I will not be attempting a self repair on this, but I just wondered if anybody has seen issues with these LED backlights already? Or, if that is actually what's wrong with it? The TV is around 6 months old, and it's used roughly 3-4 hours/day, I wouldn't expect to see a failure so quickly!

Thanks,

Steve

[Dgtech]

Re: Samsung 46" 6500 LED backlight issue

A 6 month old TV should be still under manufacturer's warranty. Call Samsung and get a guy out there to fix it. If it's not under warranty, it's gonna be hard to get a replacement bulb....Sorry.

[cbogg]

Re: Samsung 46" 6500 LED backlight issue

Led tvs don't have bubs, or even ccfls. They have a matrix of leds behind the lcd instead, which is why they're thinner, and have better colors/ black levels because the leds can be locally dimned where as bulbs cannot. I would suspect the driver board for the leds or even the cable from the board to the leds. Let us know whet the tech finds.

[Dgtech]

Re: Samsung 46" 6500 LED backlight issue

Sorry, i misread the LED for LCD. I think it's interesting that there seem to be just as many problems with the LED's as there were with the LCD's. Of course, we'll know once they are out of warranty. We'll see how many get posted here.

[se.hartmann]

Re: Samsung 46" 6500 LED backlight issue

Thanks guys, I never knew exactly how the backlight array was configured on the LED's. I will post as soon as I hear from the repair guy.

[Wizard]

Re: Samsung 46" 6500 LED backlight issue

Triad of RGB LEDs behind the LCD was in older B750 models, now currently all Samsung LED LCDs use strip of white LEDs around the edge on all 4 sides.

Sharp use white LEDs behind the LCD (I owned it for few days, hurt my eyes returned it for Samsung LED 32"). LG uses local dimming feature on LEDs behind LCD. Samsung also do partial local dimming now on D series.

And yes invoke the warranty on that TV and Samsung will take care of this by either take it to authorized shop or shop can pick it up for you if in the area.
Also since C series of all thin panels, the design is the LEDs are in strips is in halve down the middle via 2 connectors, each connector have six wires, each pair of wires is for one strip of LEDs, total of six strips. Three on one side and other three on other side arrange around the edge.

Get your facts straight on types of LED design in current TVs and past.

Cheers, Wizard

[agriffin]

Re: Samsung 46" 6500 LED backlight issue

As I'm dealing with an Samsung LED lit TV problem right now myself, there's really not a whole lot of readily available resources out there for the laymen to educate yourself on. Manufacturers aren't exactly forthcoming with TV construction information.

[Dgtech]

Re: Samsung 46" 6500 LED backlight issue

LED backlit LCD's, in my opinion, should be easier to fix than the CCFL LCD's. If you want to post some pictures of the boards and post them, you'll still get help here even if there are no tech documents out there. Just start a thread with the model number of your set.

[agriffin]

Re: Samsung 46" 6500 LED backlight issue

Thanks Dg, I already have started one, the issue I have I think might be unique and since my expertise in electronic troubleshooting is limited it might be hard for me to answer some of the questions. I think what I have is the loss of a bank of LED back lights, not in a single area but say...every 3rd light in the edge light ring. I've been able to crank the back light to full and escalate the built in brightness/gamma to get an almost normal screen, this really shows in the contrast levels though as the darks are noticeably greyed. Still a somewhat unique issue as most stuff I've seen is all or nothing on the picture/backlights.