I have checked and tried about everything checked power supply voltage 12 volt side has 11.80 volt 24 volt side has 23.50 volt 5 volt standby is at 5.16 volts like I said it does come on and light up.So I replaced the main board still dont work checked voltages between the two boards and they are the same. So thinking I may have a bad board I exchanged it for a third board same voltages as the other two does not work.So I ordered a T-con board put that in still no video.I was told that the cable from the main board to the T-con should have 12 volts on the first three or four pins I have 5.10 volts.I dont no if that is true or not because all three main boards have the same voltage.After trying all that still no video I am starting to think bad panel unless all three of them boards are bad but not likely. I am stuck.
LCD simple panel check. In a dark room, (does not have to be total), shine a flashlight at it with a station tuned in. If you see images
and you have changed the panel HV board, your flourescent tubes could be bad. If you dont, then check the cabling.
Testimonial: "The back lights are on just video on the panel tv turns on and off as it should just not picture."
There is no video on the panel lights are on.
wiring or controller then
I did try another T-con board and checked the wires with and ohm meter the seemed ok
If you are sure the tcon board is good, then the panel itself is bad.
The panel has two ribbons from the tcon board I was told even if the panel is bad I should get something on one side at least I disconnected one ribbon at a time and I still get nothing on either side.But was also told that I should have 12volts on the first 3 or 4 pins where the display cable hooks to the main board and I only have just over 5 volts.And I tried 3 boards and had the same voltage on all three so I dont no if that is true if it is then that is where the problem is.
Nothing like the mfg's docs to tell how its supposed to work. You said ribbon cables. Which brings to mind a short I once had in one. Have you checked the cables for shorts to adjacent conductors (in the cable and adjacent on the connector) and opens?
Add a CommentTest them off the tv and wiggling as you do. FYI there could be a control voltage telling the panel to shutoff not just 12V power.
I have been looking for a free service guide for this tv seen many but I got to pay I have gotten free ones before but cant find one for this tv. Been trying to find the main board voltages I have seen 12 volts at ldvs cable which I dont have and I have seen 5 volt which I do have I want to no for sure.
Thanks for the video that is the video I am getting my voltages from cause the tv is about the same.And where he has 12 volts at the ldvs cable I have 5 volts all other voltages across the board are the same as his accept at the ldvs cable and when I disconnct it still remain the same 5 volt. I follow that 5 volts into the tcon board and out to the two ribbons. I cleaned all connectors and ribbons still nothing.I got two boards from shop jimmy and they have the same voltage as mine from the tv.I checked all the regulators and the voltage on all three boards are the same. So either I am getting bad boards or something else is wrong cause I dont have 12 volt lke the video.
It just dont seem right that all three boards then would have the same problem cause I checked voltages on all three and they are all the same.I will have to go back again and see where the 12volts disappears I no I have 12volts coming into the board I just cant seem to find out where it goes and why.
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Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
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Found this on a bigger version of your TV. Dont get docs from euro sites. Too risky.https://www.youtube.com/watch?v=aS-bGJQq...
If you trace the 5/12V lead back to its source, what is the device? devices? If there is supposed to be a driver and the driver goes +-, it may have a bad transistor dragging it down.
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