Re: RCA LED32B30RQD backlight flashing(FIXED)

Update: Fixed......one led was open in series of six.....replaced with a white led....all is good....

Pretty bad when a .25 led takes out a whole tv set.......

Thanks for the help

Greg

Re: RCA LED32B30RQD backlight flashing

Ok, after playing around with the test points I figured out that #10 led is bad.
Was just dim at first, now it's out altogether. All other 11 draw 12.4 to 15 ma, but that one only would draw .12 ma at first, now it's open.

Can I just replace one led? How are they fastened?

Thanks

Greg

Re: RCA LED32B30RQD backlight flashing

UPDATE: Well swapped PSU and still exactly the same....got into the backlights......

Bottom strip has every other led out.....12 total, 6 don't light.

So...how do you test this strip? I don't have my camera right now to take pic, but the strip p/n's are: SHARP E227809 C HX-S 94V-0

also : F302Z19WCA054841A2 A

If I swap the strips, (there are 3) with each other,it still is the same flashing(but the same strip has six lights out), so it's THAT particular strip that has issues. It says...

Re: RCA LED32B30RQD backlight flashing

Yeah, I re-wet most of the solder joints over the weekend.....still the same.

I found a psu for relatively cheap that I'll try, if it works, I'll post. If not it MUST be the leds(I haven't delved into the are of the set that the leds are at.....yet.....last resort. It has 6 pair of power wires going to them and if I supply bench voltage to any individual pair, I get constant leds in all zones of the display. I'm thinking that the leds all together are too much of a load for a weak component in the psu, and causes the oscillation....

Re: RCA LED32B30RQD backlight flashing

Ttt

Re: RCA LED32B30RQD backlight flashing

Sorry, here are the pics.........

Re: RCA LED32B30RQD backlight flashing

Update: Here are pics of board highlighting the area of PSU that is in question....

Unit works, all inputs, except the backlight keeps flashing(about twice a second). Replaced all the elec. caps on the power board(#RS072S-4T06).
Hooked it up. Worked GREAT....for about 5 minutes....now back to the same flashing. Output voltage on 12 led pins is 62v unplugged from leds, 36v plugged in, with no apparent voltage fluctuation. Using a benchtop ps I connected 32v (highest it will go) to each group of six banks of led lights....each light up normally(dim, but no flashing) so I assume it's in the ps. I didn't change the MAIN elec. cap on the primary side, as I didn't have one on...

Re: New Members - please post your introductions here

Hello, new to the forum here....seems like a lot of handy info on here.

Greg