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toshiba lcd backlight is on but no picture?
mzone:
hi
i have a Toshiba 46ZV555DB set powers up and i can see the backlight lights the whole screen up ok.
fault is that the backlights are on but theres no picture or osd or anythink just backlight.
anyone have any ideas what it might be or know a link for service manual for this set.
thankyou
michael first:
hi,if the sound is ok,you should consider the T-con board as the defective one.also try to disconnect and reconnect the LVDS cable from the main board to T-con.if it doesn't sort any result might have a defective main board.cheers
WILLYAM1:
hi.
check with scope video signal in lvds cabel in main board if ok t con is defectiv most of the time its smd fuse.
willyam1
mzone:
thankyou for the help guys.
yes tv still has sound, very rarely the picture will come on, but noticed theres a ghosting on the screen menu.
im guessing this is the T-con board? ( picture attached )
the number on the board is 4046fm1m4c6lv0.2
googled nothink came up for that board number?
mzone:
after some further investigation i managed to get a picture on set, from trying blind with remote to switch av settings i managed to get picture to come on when tv is on normal tv av channels 1-5
however soon as you switch to hdmi, or scart av the lcd reverts back to just blank screen with backlight on, so this might point to main board problem.
i have also noticed when the picture is on in the middle of screen theres thin black lines showing across mid of the screen and also there seems to be a mirror image showing at at bottom, i have attached a couple of pictures showing both faults.
would the main av cause this fault? or has anone come across this problem before?
thankyou
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