Toshiba 19W330DB (Vestel 17MB24H-2 190407) freeview/DTV not working
Hi, got a friends older (2007-08) bedroom LCD TV here and the freeview/DTV has stopped working and just displays a black screen with occasional flashes of green or reddish-pink near the top of the display. Apparently it just went without any prior warning signs.
Other inputs appear to work fine and when switched to analogue (this is an old TV) I get the regular snow pattern so I don't think it's the screen itself. Can't test a true analogue TV signal since analogue TV was switched off years ago in the UK.
I've taken the back off and reseated every connector and prodded on various parts of the board and cables using a plastic ruler but nothing alters the behaviour.
I tightened every PCB ground screw and gave the TV a good shake whilst on but still no dice.
It's one of those 12v adaptor TV's so there's no internal mains power supply, the tuner had +33v and +5v printed next to two of the pins and those voltages are correct.
No visual signs of bad caps or other suspect components, although some parts were so small that it's hard to see them anyway in detail. There's lots of small ventless electrolytic capacitors however.
See attached images for pictures of the board and a low quality GIF of the fault in action.
Any ideas as to what the fault could be and other tests I could do? Like I said the LCD is fine since the other modes work.
Thanks.
Other inputs appear to work fine and when switched to analogue (this is an old TV) I get the regular snow pattern so I don't think it's the screen itself. Can't test a true analogue TV signal since analogue TV was switched off years ago in the UK.
I've taken the back off and reseated every connector and prodded on various parts of the board and cables using a plastic ruler but nothing alters the behaviour.
I tightened every PCB ground screw and gave the TV a good shake whilst on but still no dice.
It's one of those 12v adaptor TV's so there's no internal mains power supply, the tuner had +33v and +5v printed next to two of the pins and those voltages are correct.
No visual signs of bad caps or other suspect components, although some parts were so small that it's hard to see them anyway in detail. There's lots of small ventless electrolytic capacitors however.
See attached images for pictures of the board and a low quality GIF of the fault in action.
Any ideas as to what the fault could be and other tests I could do? Like I said the LCD is fine since the other modes work.
Thanks.
Attached Files
Comment