Ballboy1066
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Feb 25, 2018, 5:51 PM
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Re: LG 42LN613V TV No Image..Sound Only!
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I have a 4yr old 42inch Smart TV an LG 42613V. I suspect an LED strip failure (not yet dismantled and tested at this stage until I'm happy with my power/LED driver board). <br> <br>I have a standby power-light and the set powers up when I power on I have audio TV Channels/Radio Channels but, no screen/backlights. <br> <br>I have established the following, <br> <br>a, T-Con board okay; flashlight test (with menu on) shows feint menu outline on the black screen. <br>b, I have power from power-board to, and from, the main (logic) board; the return values are correct from main board as per the 'legend' on the board. <br>c, I have tested LED driver output power to LEDs both connected, and disconnected; and I'm getting some weird results from this test. I have LED+ and LED- (x2); <br> CONNECTED- LED+(1)= 119v dropping to 57v <br> LED+(2)= 78v dropping to 57v <br> ------------------------------------ <br> DIS-CONNECTED- LED+(1)= 117v dropping to 57v <br> LED+(2)= 110v dropping to 57v <br> <br> I suspect that my LED driver is okay and the strip lights, when connected, are causing me problems but, before I dismantle the panel I'd appreciate any advice as to the readings I'm getting to give me some pointers? I expected the voltage to increase with an LED strip-light failure but I'm getting this voltage drop scenario which is confusing me. <br> <br> ballboy1066 <br>
(This post was edited by Ballboy1066 on Feb 26, 2018, 2:55 PM)
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