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Need help with LG 42PC3DVA-UD
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techboy1000



Joined: 07 Sep 2010
Posts: 11

PostPosted: Tue Sep 07, 2010 7:54 pm    Post subject: Need help with LG 42PC3DVA-UD Reply with quote

I have the above model and it has sound but absolutely no picture. Has anyone encountered this problem and how did you fix it?

If I could get an idea where I should be focusing my attention, it would save me a lot of time. Thanks.
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Justmanuals



Joined: 21 Aug 2004
Posts: 1948

PostPosted: Tue Sep 07, 2010 11:15 pm    Post subject: Reply with quote

This Parts & Service manual can now be purchased for $11.77 and downloaded immediately after payment from http://www.justmanuals.com


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minnie



Joined: 18 Aug 2005
Posts: 2880
Location: Hell

PostPosted: Wed Sep 08, 2010 3:24 am    Post subject: Reply with quote

No smeared video or nothing? Does the panel light when you turn it on?
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techboy1000



Joined: 07 Sep 2010
Posts: 11

PostPosted: Wed Sep 08, 2010 4:21 pm    Post subject: Reply with quote

minnie wrote:
No smeared video or nothing? Does the panel light when you turn it on?


No. Nothing. The screen remains the same when I power up as it is when I turn it off. As for the panel, if you mean the light to indicate that the power is on, yes. It is red when off and turns green when I turn the set on.
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minnie



Joined: 18 Aug 2005
Posts: 2880
Location: Hell

PostPosted: Wed Sep 08, 2010 11:14 pm    Post subject: Reply with quote

Did you check the caps on the power supply? Check the VS and VA voltage?
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techboy1000



Joined: 07 Sep 2010
Posts: 11

PostPosted: Thu Sep 09, 2010 2:58 am    Post subject: Reply with quote

minnie wrote:
Did you check the caps on the power supply? Check the VS and VA voltage?


I looked over the circuit boards for obvious damage and found nothing. However, I checked all the ceramic fuses I could find and one 4A-250V fuse on the YSUS board was open. Trouble is, I don't know if it blew because it may have been weak or if something caused it to blow.

All I did for caps check was inspect for bulging tops. I know that's not very reliable, but the caps on the power supply look fine. If anything, those on the YSUS board do look slightly bulged in comparison, but I'd have to remove it to test them and that will be a job in itself.
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minnie



Joined: 18 Aug 2005
Posts: 2880
Location: Hell

PostPosted: Thu Sep 09, 2010 3:12 am    Post subject: Reply with quote

Y sustain blow all the time... There should be a part number on the board.
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techboy1000



Joined: 07 Sep 2010
Posts: 11

PostPosted: Thu Sep 09, 2010 7:03 am    Post subject: Reply with quote

minnie wrote:
Y sustain blow all the time... There should be a part number on the board.


Do you mean a part number for the whole board? Are you suggesting replacing the whole board?
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minnie



Joined: 18 Aug 2005
Posts: 2880
Location: Hell

PostPosted: Thu Sep 09, 2010 10:13 pm    Post subject: Reply with quote

techboy1000 wrote:
minnie wrote:
Y sustain blow all the time... There should be a part number on the board.


Do you mean a part number for the whole board? Are you suggesting replacing the whole board?


Welcome to my world. Yes the whole board.
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techboy1000



Joined: 07 Sep 2010
Posts: 11

PostPosted: Thu Sep 09, 2010 11:17 pm    Post subject: Reply with quote

Found the part number. It's 6871QYH048B. Now what? How much does it cost to replace one of these boards? Hope you have a good source where I can buy one. lol
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