hello This is my first post, My Toshiba 40L1333b LED TV has sound but no picture. I used a torch in the dark and the picture is barely visible. and we have sound any help would be appreciated thanks in advance
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Toshiba LcD TV 40L1333b sound no picture
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Re: Toshiba LcD TV 40L1333b sound no picture
Pictures are not really good enough for troubleshooting - need better lighting - daylight no flash. Power supply is a Vestel which is a can of worms. There should be another board
or two? One distributes power to the LED back light the other is the main board that
controls everything - again if it is a vestel main the word control may not apply.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740
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Re: Toshiba LcD TV 40L1333b sound no picture
OK, what DC Voltage do you have on the two legs of the main filter caps (47uF 450VDC) and on the two legs of the filter caps (1000uF 35V) of the LED driver circuit?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Toshiba LcD TV 40L1333b sound no picture
OK, PFC Voltage booster is working, and the 24V LED power supply is OK.
Can I see the whole back side of the TV so I can see how all the boards are connected together?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Toshiba LcD TV 40L1333b sound no picture
OK, one board I do not see is the LED driver board, it may be inside the LCD panel.
I found the SCH for the power supply board from TOM66 web site.
You can check connector PL306 to see if the BL_ON/OFF signal is present or not, if it is present, then you will have to locate that LED driver board, we know that we do have 24V to feed the LED driver board, that 24V is boosted to higher Voltage to drive the LED strings.
If the LED driver board is inside the panel, that will be a big job to get to it.Attached FilesNever stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Toshiba LcD TV 40L1333b sound no picture
Turn the TV on, set your meter to DCV, black probe on the chassis, red probe on the pin of the connectors that I redlined.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Toshiba LcD TV 40L1333b sound no picture
OK, the main board is sending the correct signal, so it is the matter of finding that LED driver board.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Toshiba LcD TV 40L1333b sound no picture
This is may be your LED driver board:
http://www.ebay.co.uk/itm/like/26155...ectorid=229508Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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