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oldmanjerry
Joined: 28 Sep 2009
Posts: 4
Location: United States
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 Posted: Mon Sep 28, 2009 10:20 am Post subject: samsung ln-s2651dx/xaa has sound no pic but back light works |
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| I opened it up and found on the powersupply board in the top right corner was a 470mfd 25v hi temp cap bad/bloated & I didn't have the same size so I replaced it with a hi temp 100mfd 25v cap which didn't change anything. I did notice that the screen changes from light black to dark black when you change sources, channels, or when feeding composite video & you disconnect the video cable. this unit will not even display the menu. any ideas on where to go from here? |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Mon Sep 28, 2009 2:04 pm Post subject: |
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Try putting in the "correct" value cap. ($100.00 = $470.00? I think not.)  |
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oldmanjerry
Joined: 28 Sep 2009
Posts: 4
Location: United States
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| Posted: Mon Sep 28, 2009 3:48 pm Post subject: samsung ln-s2651dx/xaa has sound no pic but back light works |
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| oops! I meant 1000mfd cap. I will replace w/right one as soon as I locate it. |
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oldmanjerry
Joined: 28 Sep 2009
Posts: 4
Location: United States
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| Posted: Wed Oct 21, 2009 11:10 pm Post subject: samsung ln-s2651dx/xaa has sound no pic but back light works |
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| I replaced the cap with the right size & I still have no pic. I checked voltages on the ribbons connecting the PS to the main board & all look ok. any suggestions? |
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Thu Oct 22, 2009 11:43 am Post subject: |
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Do you have OSD. (On Screen Display(Menu))? If you do have OSD, then the problem is most likely in the source and not the TV.
If the backlights are on when the set loses video after it has been on for a while, most likely the LVDS cable is defective. If the set has backlights but no video when it is first turned on, the T/Con or Main Board would probably be at fault.
Check the simple things first, like a LVDS cable that is not plugged in properly or has a loose pin or corrosion. usually unplugging and replugging will confirm or simply wiggle the cable while the set is on. Also check the power connector to the panel from the IP (power pcb) (if there is a separate one) being loose.
If you have an O'scope you can monitor the LVDS cable for activity. If there is activity on the LVDS cable the main board is most likely OK
Jesse |
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oldmanjerry
Joined: 28 Sep 2009
Posts: 4
Location: United States
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| Posted: Mon Oct 26, 2009 3:48 am Post subject: samsung ln-s2651dx/xaa has sound no pic but back light works |
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| I have no OSD & no video info the whole time. when you press the source, channel or menu buttons the back lights dim some & when you disconnect the video source it also will dim. I figured I would try the cables first since that would be the easiest but that didn't help. I am beginning to wonder if when that cap went it allowed some ac into that lcd drive processor & took it out. thoughts?? any one now where I can find that main board cheap?? I am trying to repair this under my wifes radar. |
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Mon Oct 26, 2009 5:47 pm Post subject: |
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Guessing can be expensive:
If you have a friend use an O'scope to determine failure board.
It can also be a bad panel or even a bad LVDS cable.
Unlikely capacitor caused failure.
Parts are available here: http://www.andrewselectronics.com/welcome.aspx
BN94-00863A = Main board = $180.60
BN81-01686A = T-Con = $60.45 and is only for panel LTA260W2-L13
BN81-01900A = T-Con = $156.05 and is only for panel T260XW02
Hope this helps. |
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