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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
LG 47LN5200-UB

 
 


jgtime
New User

Dec 26, 2017, 7:26 PM

Post #1 of 7 (867 views)
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LG 47LN5200-UB Can't Post
Hello All. <br> <br>I did do a search of the forums, prior to posting my question, so here goes. <br> <br>LG 47LN52200-UB - had bad led strip. Replaced with new strip, tested and working with my SID Led Tester. <br>Upon first start up after replacing LED Strip(replaced both L2 and R2), Tv looked good, No signal indicator came on screen. But then wham quickly went away. <br>Since then, i have been unable to get a picture on the screen, only sound. <br>Replaced Main board and Tcon board. Checked ALL led strips and they are running 100% with proper voltage. <br>Issue still exists. All strips power up, screen glows, have sound, but no picture. <br> <br>Debating on replacing Power board, but based on experience (or lack there of) not thinking power board would cause this. Maybe Panel shorted out when firing up for the first time after strips replaced???? <br> <br>Usually able to fix most all LCD's and LED's, but this one has me stumped. <br> <br>Thank you in advance. <br>


(This post was edited by jgtime on Dec 26, 2017, 8:34 PM)



jts1957
Veteran


Dec 26, 2017, 8:13 PM

Post #2 of 7 (860 views)
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Re: [jgtime] LG 47LN52200-UB [In reply to] Can't Post
Flashlight test?

LEDs are just for backlighting the TFT screen of the panel. They took the place of the fluorescent tubes previously used.

You may want to give correct model number.


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Location: Far, Far Away

(This post was edited by jts1957 on Dec 26, 2017, 8:14 PM)


jgtime
New User

Dec 26, 2017, 8:37 PM

Post #3 of 7 (850 views)
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Re: [jts1957] LG 47LN52200-UB [In reply to] Can't Post
Good catch on the model number, just a mistype. I corrected.

Negative results on flashlight test, which I have used many times.
All LED's are illuminated.

Screen does come on, just no picture.

baffled...


jts1957
Veteran


Dec 26, 2017, 9:04 PM

Post #4 of 7 (844 views)
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Re: [jgtime] LG 47LN52200-UB [In reply to] Can't Post
May have received a defective New board.


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Location: Far, Far Away


jgtime
New User

Dec 26, 2017, 11:50 PM

Post #5 of 7 (837 views)
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Re: [jts1957] LG 47LN52200-UB [In reply to] Can't Post
Could be, but highly unlikely since same symptoms exist after replacing tcon and mainboard.

Do you agree, powerboard has no bearing on sending image to screen so not worth replacing?


jts1957
Veteran


Dec 26, 2017, 11:58 PM

Post #6 of 7 (835 views)
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Re: [jgtime] LG 47LN52200-UB [In reply to] Can't Post
Shouldn't involve PS. You said ALL voltages present and correct?
Was any image present BEFORE working on lamps? If so, something may have been left unconnected.


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Location: Far, Far Away

(This post was edited by jts1957 on Dec 27, 2017, 12:00 AM)


jgtime
New User

Dec 27, 2017, 3:08 PM

Post #7 of 7 (821 views)
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Re: [jts1957] LG 47LN52200-UB [In reply to] Can't Post
left unconnected? lol.........

 
 
 


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