Goodmans LD3261HDFVT - Vestel - sound but no piccy

[Turnip]

Hi Folks,

Have one of these with sound, backlight and a dark screen. Note from back threads that the screen/LVDS  has been a problem. Anyone had similar ?  17PW20-V2 and 17MB22-2   -   Chris

[robbieh]

Hi Chris,
Have you tried the usual fuse on T-Con?. Did have some boards somewhere i will see if i still have them somewhere.
Regards Rob

[Turnip]

Hi Rob and thanks,

Checked and found fuse CP101 marked 'P' (3A) O/C. Got nothing smaller than a Wickman - wonder who does SMD fuses at a realistic price ?

Thanks again - Chris.

[robbieh]

Hi,
CPC stock the Multicomp smd not too expensive!! If need be i can order when i do but might have to wait a week. http://cpc.farnell.com/multicomp/mc06ct-003/fuse-smd-0603-t-3a/dp/FF02260
Regards
Rob

[Turnip]

Hi Rob, and thanks,

Was fun as I still had a few of those CPC/Farnell microscopic fuses kicking about - used 2 x 2A in parallel with enormous difficulty holding the little buggers down while soldering - bring back 'Dorman-Smith' screw-in 13A fuses, poor contact caused plugs/sockets to catch fire - warmed us in the cold Post War 40s

Set worked so guess it was a spurious pop - thanks again - Chris.

[mattlumb]

Hi Chris, I have fixed a few Panasonic TX23LXD50 with similar fault.  My theory is these tiny 0603 fuses aren't properly rated to take the current surge into the ceramic (low ESR) decoupling capacitors when the power board starts up, so they suffer a higher failure rate. As the power board ages, it starts up quicker as the output caps dry out, so the size of the in-rushes increases and suddenly pop and the picture is gone.
Matt

[Turnip]

Hi Matt and thanks,

Note that the fuse (first one of two in series) fed a buck converter using non electrolytic reservoir caps - naturally thought chip had popped - glad it hadn't.

Could also be simply fatigue - getting to know the feeling - Chris