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HD-DAVE
Joined: 16 Feb 2007
Posts: 225
Location: Delta, BC
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| Posted: Fri Jun 07, 2013 3:57 am Post subject: The strange ways flatscreens go bad |
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Had to grab this little 32" LG set ( 32LH30 ) from the e-waste stream where I work...after all, how many 32" sets that you come across are full 1080P HD ? Anyways, it powered up nicely and I thought why did they throw it out ? ...and hour later i got my answer - the video had dropped out. Still had a "raster" / backlight though. Power cycle didn't bring it back. Opened it up and after poking around was somewhat shocked by what was causing the fault.
Now its your turn ! Can anyone spot the reason it died ? ...here's a pic.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Jun 07, 2013 4:15 am Post subject: |
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Do I see a blistering cap on the power supply, top right corner?  If so, that's very common on those.
I have a couple of LCDs here you should come and get. One is a 1080p 120HZ LG, where I get vertical lines intermittently on the right 1/2 of the screen...
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jask
Joined: 17 Mar 2006
Posts: 10187
Location: kamloops BC
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| Posted: Fri Jun 07, 2013 2:33 pm Post subject: |
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easy... the power cord is missing. 
seriously.. what is up with the power connection to the main board why is it on an angle?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 07, 2013 4:29 pm Post subject: |
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Picture is not clear enough and/or close enough to make any visual observations.
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HD-DAVE
Joined: 16 Feb 2007
Posts: 225
Location: Delta, BC
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| Posted: Fri Jun 07, 2013 5:42 pm Post subject: |
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Power connection to the main board and all other connections are fine. No bad / swelled caps. I'll give you a hint its not a actual component failure but rather a manufacturing inflicted defect and Mac it is visible if you look *very* closely...but its *tiny* !!! Another hint is that its the video and everything associated with on screen image generation that drops out or is intermittent and its not power supply or backlight related at all.
Sorry if the pic is a bit smallish but a 500 k picture upload limit is pretty restrictive ( yeah I know it costs $ for webserver/hosting space so not complaining or anything  )
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 07, 2013 11:12 pm Post subject: |
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I understand that and it's hard to spot easily and my eyes aren't the best anymore. But it looks like the latch connector for the ribbon cable going to the TCON is up. But again, the pic is not clear enough to say for sure. I NEED CLARITY>LOL<! 
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 07, 2013 11:15 pm Post subject: |
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Oh, and you can use Imageshack or Photobucket for free hosting.
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HD-DAVE
Joined: 16 Feb 2007
Posts: 225
Location: Delta, BC
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| Posted: Sat Jun 08, 2013 12:49 am Post subject: |
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Mac you were close... Ok I won't torture your eyes/brains any longer; the fault is a hole in the T-Con cable ! In my pic it did show as black spec on the ribbon.
The set seemed like it not been cracked open by anyone so maybe it was an assembly glitch that somehow got past QC. Its amazing the set worked at all. Or maybe it got worked on for some other problem and whoever serviced it damaged the cable...
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mc86
Joined: 20 Sep 2008
Posts: 767
Location: pittsburgh, pa
TV/Projector: ECP 4500 (Vidikron box), ECP4500+, wanting 07MS/07MTS, evaluating pc soft-blend
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| Posted: Sat Jun 08, 2013 1:05 am Post subject: |
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See kids, dumpster diving can really pay off! Nice score and nicer catch.
Matt
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HD-DAVE
Joined: 16 Feb 2007
Posts: 225
Location: Delta, BC
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| Posted: Sat Aug 03, 2013 11:26 pm Post subject: |
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Finally got my replacement Tcon cable from Encompass. Only $16 plus $7.50 shipping to canada not bad! Set fires up nicely now no hiccups.
Now it's on the the 42" Samsung I scrounged the same day - that one has some bizarre backlighting behaviour as it warms up ... Looks like solarization sometimes. Weee! Yes my friends and family think I am the King of the
Dumpster divers. Lol.
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Scojolicious
Guest
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| Posted: Wed Oct 30, 2013 3:05 am Post subject: |
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Mine just popped and screen went black but still powered up. Power supply maybe?
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MPHSystems
Joined: 01 Aug 2013
Posts: 21
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| Posted: Wed Sep 17, 2014 3:40 pm Post subject: |
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| HD-DAVE wrote: | Power connection to the main board and all other connections are fine. No bad / swelled caps. I'll give you a hint its not a actual component failure but rather a manufacturing inflicted defect and Mac it is visible if you look *very* closely...but its *tiny* !!! Another hint is that its the video and everything associated with on screen image generation that drops out or is intermittent and its not power supply or backlight related at all.
Sorry if the pic is a bit smallish but a 500 k picture upload limit is pretty restrictive ( yeah I know it costs $ for webserver/hosting space so not complaining or anything ) |
I can't see it but based on that description I'll say T con cable.
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