Sharp Aquos 80" Backlight Issues

[tom050]

Hi there,

Just looking for a little assistance with the backlight. There is some issues with the back light on my tv so I took it all apart to get to the backlight strips. I have viewed some videos how to test the individual leds with two double aa batteries in series. Just to clarify the led strip is 30 leds long and each one is 3.1 volts as marked on the strip. It also says 94 volts per strip which makes sense with the 30 leds. Now when I try to test one led on the strip and I have confirmed the positive and negative but the led does not light up.

Is it possible that all the LEDs on all the strips were fried during some surge or issue with the power supply? Or am I missing something here?

Thanks

Tom

[budm]

Re: Sharp Aquos 80" Backlight Issues

"It also says 94 volts per strip " The 94V i s NOT the Voltage rating, that has to do with UL compliance rating of the PCB.
UL94 V-0, V-1, V-2 FLAMMABILITY STANDARD

[budm]

Re: Sharp Aquos 80" Backlight Issues

How about some good clear pictures of what we are dealing with?
Also not good idea to test LED without having current limiter in place.

[tom050]

Re: Sharp Aquos 80" Backlight Issues

Hi there,

There is many video showing testing the led and the leds should be approx 3.1volts according to my research. Please see picture of backlights. Hope someone can help.

Tom

[kimarcher_gy]

Re: Sharp Aquos 80" Backlight Issues

I am presently troubleshooting a LC-80LE632U TV, if you check my posts you will find some information on the LED's they are 30 in series for each of the fifteen rows and 3 vdc per LED times 30 is a total of 90 vdc which is a safe voltage to test them but if you need something more specific please get the Part Number of the LED and check the Data Sheet. Please remember that the negative probe should go to the Cathode and the Positive to the Anode when checking each individual LED with 3VDC.