LG 55le5400 no back lights


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LG 55le5400 no back lights

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rtruett1
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Jul 8, 2016, 2:29 AM

Post #1 of 7 (1543 views)
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LG 55le5400 no back lights	Can't Post

I have a LF 55le5400 and there is no back lights at all coming on whenever the tv is turned on. I have replaced the the led driver board and sent the Main board off and found to be working properly. After making some voltage checks on LGP4247-10 power supply board and everything looked to be okay except Pin 12 that goes to the eax61532702 (0) main board. It is labeled as PW on 24v and has 3.4 volts on this pin when the tv is powered on. I have ordered another power supply board hoping that this will fix my problem any help would be appreciatated.

jts1957
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Jul 8, 2016, 5:07 AM

Post #2 of 7 (1540 views)
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Re: [rtruett1] LG 55le5400 no back lights [In reply to]	Can't Post

http://imgur.com/7V96nst

If you mean P201 - Pin 12 SHOULD be 3.5V

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Location: Far, Far Away

(This post was edited by jts1957 on Jul 8, 2016, 5:10 AM)

rtruett1
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Jul 8, 2016, 11:14 AM

Post #3 of 7 (1533 views)
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Re: [rtruett1] LG 55le5400 no back lights [In reply to]	Can't Post

On the board Pin 12 is marked Pw On 24v.

jts1957
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Jul 8, 2016, 4:40 PM

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Re: [rtruett1] LG 55le5400 no back lights [In reply to]	Can't Post

The LGP4247-10 power supply board, with the AC connector positioned to your lower left, has a 24 pin connector (just across from the AC connector) to your lower right labeled 'P201' (just behind its top). Its pin-out chart is just below the connector, odd numbered pins on the left and even numbered pins on the right. The row of pins closest to the edge of the PCB are 'even.' IF it is this connector you're referring to, I don't see any pin marked 'Pw On 24v.' I see pin 1 marked 'PW on' & pin 2 (and pins 3 and 4) marked '24V'.

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Location: Far, Far Away

(This post was edited by jts1957 on Jul 8, 2016, 7:29 PM)

rtruett1
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Jul 8, 2016, 6:22 PM

Post #5 of 7 (1523 views)
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Re: [rtruett1] LG 55le5400 no back lights [In reply to]	Can't Post

Okay you're right i was misreading didn't realize that there were that many pins. I thought it was just 12 pins I've ordered a power supply board will check mine more thoroughly over the weekend. Thanks for the help I'll definitely need it before this is over.

rtruett1
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Jul 14, 2016, 11:34 PM

Post #6 of 7 (1465 views)
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Re: [rtruett1] LG 55le5400 no back lights [In reply to]	Can't Post

Okay I have replaced power supply bd..Led bd...and sent my main bd off for repair with nothing supposedly found, just wondering if my panel or led's might be the problem.

jts1957
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Jul 15, 2016, 1:26 AM

Post #7 of 7 (1463 views)
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Re: [rtruett1] LG 55le5400 no back lights [In reply to]	Can't Post

LEDs run at their maximum intensity = shortened LED lifespan.

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Location: Far, Far Away

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