Samsung UE32J5373AS Weird LED Problem
Hi all, first time seeing a LED problem this weird so I wanted to discuss with y'all before handing back this TV to my costumer.
This TV came to my shop with no picture but sound present. So I thought ok this must be a LED problem and I shine a light with my phone's torch amd and yup I see the image. So I disassemble it and before changing the LEDs I check the motherboard voltages (this unit works with an external 16V DC brick) and I see 54 volts at the input pin of LED strip, considering this TV has 2 strips of 7 LEDs which at 3~ volts it must be equal to like 42 volts. I remove the power and power the LEDs with my tester and they all shine ok at arounf 42 volts. Next thing I power the TV confirm that there's a picture which is dim and while the TV is still on I inject voltage into the LED strip and they all shine bright.
Next thing which is what's bothering me that after I remove the tester probes LEDs continue to work!! And now they're at the correct voltage which I assume aroubd 42 volts. I tested it likr an hour and it still works.
So what was the problem? I don't get it did I kick started the led driver circuit by injecting voltage? Is this now ok to hand it back to the costumer or should I replace the LED strips anyway?
This TV came to my shop with no picture but sound present. So I thought ok this must be a LED problem and I shine a light with my phone's torch amd and yup I see the image. So I disassemble it and before changing the LEDs I check the motherboard voltages (this unit works with an external 16V DC brick) and I see 54 volts at the input pin of LED strip, considering this TV has 2 strips of 7 LEDs which at 3~ volts it must be equal to like 42 volts. I remove the power and power the LEDs with my tester and they all shine ok at arounf 42 volts. Next thing I power the TV confirm that there's a picture which is dim and while the TV is still on I inject voltage into the LED strip and they all shine bright.
Next thing which is what's bothering me that after I remove the tester probes LEDs continue to work!! And now they're at the correct voltage which I assume aroubd 42 volts. I tested it likr an hour and it still works.
So what was the problem? I don't get it did I kick started the led driver circuit by injecting voltage? Is this now ok to hand it back to the costumer or should I replace the LED strips anyway?
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