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Sanyo FVD48P4 - Decaying LED driver voltage, No Backlight    
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habznation



Joined: 10 Mar 2017
Posts: 2
PostPosted: Fri Mar 10, 2017 2:21 pm    Post subject: Sanyo FVD48P4 - Decaying LED driver voltage, No Backlight Reply with quote
I have a Sanyo FVD48P4 with good audio and an LED backlight that just flashes once.


*** LED driver voltage with and without load starts at ~60v and decays to 0.***

I checked each indiviudal LED with 3.3v and found 5 open or shorted LED's.

I got 3 replacement zener diodes from a TV repairshop, and replaced 3 bad LED's. I replaced the other two bad LED's with 5mm 35000mcd LED's I had from eBay as a trial, because i had no other zeners.



The TV shop checked all capacitors and verified good capacitance.

Same issue

I have looked everywhere on the All-in-one motherboard for any type of LED inverter fuse of any type and cannot see one......I have looked hard online for a service manual for this board, with no luck.....

Any help anyone could provide be greatly appreciated......

Thank You!!
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habznation



Joined: 10 Mar 2017
Posts: 2
PostPosted: Mon Mar 13, 2017 7:34 am    Post subject: Reply with quote
does anyone have any ideas
kuhurdler



Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS
PostPosted: Tue Mar 14, 2017 9:23 am    Post subject: Reply with quote
most of these have some kind of error detection circuit for the backlight. It sounds to me like that is being activated.
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