Re: Sanyo FVD48P4 - Decaying LED driver voltage, No Backlight Flashes Once



thank you very much budm, i will reverse them

further, i will get more zeners tomorrow and use them instead of these LED's

BUT, should my voltage be decaying like that? shouldnt it be holding? I'm measuring with the LED's connected and again with them disconnected and its the same.....starts at around 60v and slowly drops to 0...

Re: Sanyo FVD48P4 - Decaying LED driver voltage, No Backlight Flashes Once




no i didnt put them reverse bias! thank you! i put the stripe to the negative where the LED would go! So reverse them?

as for the substitute LED's , i checked on ebay where i got them and apparently theyre 20mA...

Re: Sanyo FVD48P4 - Decaying LED driver voltage, No Backlight Flashes Once

[QUOTE=Andrew F. Ali;732556]So you found both bad LEDs and Zener diodes or did you replace bad LEDs with zener diodes??[/QUOTE

thank you for the reply!

i replaced 3 bad LED's with zeners yes........the other 2 bad ones i tried replacing with actual LED's i had from something elseRe: Sanyo FVD48P4 - Decaying LED driver voltage, No Backlight Flashes Once

[QUOTE=Andrew F. Ali;732556]So you found both bad LEDs and Zener diodes or did you replace bad LEDs with zener

Re: Sanyo FVD48P4 - Decaying LED driver voltage, No Backlight Flashes Once

.

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.
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hello everyone.....hoping u guys will be able to help me