Question about Televison & Video
You will need to get a multimeter, and verify that you are getting 24vdc from the power supply to the inverter board(s). Then you will need to verify that the main board is putting out the "back light on" or BL_ON to the inverter boards. The BL_ON signal is usually around 3-3.5vdc. If you do not know how to use a multimeter, I would suggest you take it to a shop. Also, laying a main board or any other sensitive electronic parts on a towel isn't recommended.
Posted on Dec 13, 2012
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Posted on Jan 02, 2017
Your problem is your thermal fuse.It is located around the bottom of the compartment that houses the lamp. You will have to remove the lamp and take the bottom back panel off. Then you will have to remove the fan. I ordered the thermal fuse so I would know what I was looking for when I started to replace it. If you take your time and are patient enough you can fix it yourself. I fixed mine and it's working great.GOOD LUCK!!!
Posted on Jun 23, 2009
You will have to isolate the main board and Inverters.
Unplug the inverters and turn on the set.
If it "turns on" then try re-connecting each inverter seperately to see if only one is causing the problem.
Posted on Mar 07, 2009
I would suspect one or more of the miniature flourescent backlight lamps. One way to confirm this would be to power up the set with a grayscale image at 40 to 60 IRE. If one or more lamps is failing to light, a slightly darker horizontal area in the grayscale will give it away. Unfortunately, Sony will not supply any of the backlight components apart from a new LCD panel. Sorry.
Posted on Sep 01, 2009
You need to verify first that you do have 24vdc feeding the inverter boards, if you do have 24vdc then we can be sure it is the inverter boards. The inverter board will have very small surface mounted fuses, check for that also.
Posted on Dec 02, 2009
The 24vdc is turn on by the signal from the main logic board, it is not always on, the standby 5vdc is always on. So yes it can be the power supply board is bad, but just to besure we need to find out if it is getting the turn on signal from the main board first.
You can have 24vdc at the inverter board and it will not light up the CCFL until it gets the signal from the main logic board to turn the lamps on (this is the STANDBY condition, the TV is on but the screen in not lit up util it see the video signal).
Send me good clean and clear pictures of the power supply board, firstname.lastname@example.org, connectors of the Power supply, bottom side of the board, then I may be able to tell you which pin is a control input pin. Most people will just throwing parts in and hope that they one of the parts will fix the problem. Used Power supply module for this TV is over $100. http://www.google.com/products?rlz=1T4GGIH_enUS282US283&q=delta+DPS-379AP&um=1&ie=UTF-8&ei=USsxTKn3J6TonQfFlJGEBA&sa=X&oi=product_result_group&ct=title&resnum=4&ved=0CCsQrQQwAw
Posted on Jul 05, 2010
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