Hello, first of all I am not professional in this TV repair (I could consider it my hobby) but always taking the necessary precautions to not badly achieve more the equipment, I have a LG Led TV model 32LB550B, I have the doubt if the problem is the LEDs or the source (Suply Board) since the voltages that go to the LEDs (117v 250mA, 24v 0.8A) are marked on the source voltage tab but when measuring I get this 143.8v on Led + and 19v on Led- , I understand that it should be 143.8v-19v = 124v, I don't get 117v. Before opening the panel and testing Led by Led could you help me with your experience and tell me if the problem is the source or some Led of the backlight?

repair the LED driver source, the integrated one is the map3202.a source is high so it is in protection (LEDs off) you must always have a LED tester so as not to disassemble all the tv in vain.

A Led was burned (I'm not surprised since this TV was used almost 15 hours a day and with the backlight and brightness option at 100), I opted to change the 3 Led strips, since the 3 strips on the back showed Burned areas (I tried each LED, they work but I prefer to change all the strips since they are only 3 and I found them new and at a reasonable price). If anyone can close the topic I would appreciate it. Thank you