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Hello there, I have the samsung power board BN44-00134A and although most people that have problems with it are saying that 3 or 4 capacitors are blown and bulging or leaking, but no matter what the audio works pefect and the screen will sometimes work for a few min after turning it on then will just cut off. Hope someone can help....

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You may dead or dying 24vdc for the backlight inverter board or bad inverter board, or the main board is not sending the signal to turn on the 24vdc or the backlight inverter.
http://www.shopjimmy.com/samsung-bn44-00134a-power-supply.htm
The top of the caps should be perfectly flat, bad caps can also look normal but can have high ESR.
You need to do more troubleshooting.

First, look at the screen in darkened room when the TV goes out to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.

Please post back what you find.

Posted on Nov 13, 2010

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