Vertical lines/bands on Sony Bravia KDL-46EX710
This 2.5 yr old LED 46" TV started one day to show white spots over the screen as if a poor aerial (on an old analogue TV). This progresses to narrow vertical bands of pixels flashing different colours on top of the normal picture. The bands are not solid but more like a long coloured flashing barcode This then then finally degrades to vertical bands of white flashing bar codes that cover 70% of the normal picture.
When the TV is cold i.e. overnight is off, it will start and operate perfectly for 15 mins then the white spots, coloured vertical and final white bands/barcodes occur over the next say 5 mins.
All other TV operations work perfectly, menus etc. Is this a LCD screen problem or a board replacement i.e. the TCON ?? board. The TV only has 3 computer type boards in the back with mainly plugin connectors and cables so swapping a board looks possible
Any ideas,
Thanks
Is this a good question?
8 Comments
"it will start and operate perfectly for 15 mins", check the capacitors on the power board for any signs of bulging, leaking or other issues. Can you post an image of what your screen looks like, as well as your boards, with your question?
by oldturkey03
looks like a bad Tcon board
by oldturkey03
Thanks for your advice,
I've been away and so haven't had a chance to pull the back off again and take pictures of the boards. I remember everything looked brand new and all visible components, soldering and connectors appeared AOK.
Surprisingly there was no dust, as if I had just sprayed CO cleaner over everything.
Have since left TV on for a day and it occasionally flickers back to a normal picture for 4 or 5 seconds and then back to the bands. I keep reading about these TCON boards so now I'll have to find out where to buy one to try out. It appears it is this or buy a new TV unless Sony Australia come to the party.
by lyleg
lyleg, take a look and see if you find something that identifies which chassis number your TV is, probably something like AZXXX. That would help to get the schematic etc.
by oldturkey03
See new attached photos of TV with back off. You can see what a terrible witness I would be as there only two boards really the central one has a metal cover and is is part of the screen itself.
Metal back of screen/panel has written TMA9015 Model # T460HW04 V.5 AU Optronics.
Viewed from back LHS board A1754373A
RHS is where all the external AV connectors are has # A1754490C
by lyleg
Show 3 more comments