Rca 32" RLDED3258A-c only powers up momentarily.

[sputnikoff]

Rca 32" RLDED3258a-c will flash the logo momentarily and then shut off.I have verified leds all come on and voltage is around 37vdc however it quickly shuts down and don't get stable dc voltage.

[dick_barton]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

May be worth looking at this Youtube video. Says the led voltage is 71V
https://www.youtube.com/watch?v=GrfSmtzFjCc

[budm]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Pictures of what we are dealing with? Please upload good clear pictures of the whole backside of the TV showing all the boards, and good clear pictures of the connectors that show the pinout of the connectors.

[Andrew F. Ali]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Sounds like a typical LED Backlight failure issue, to me.

[sputnikoff]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Got those pics for you bud.

[sputnikoff]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

also

[budm]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Only one board?
Leave the meter probes on the two legs of capacitor EB801 in that LED driver circuit and then turn on the TV while watching the meter to see how high the DCV jumps up to and settles down to after 10 second, the repeat the same test but without the LED connector in place.

[CapLeaker]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Yeah, RCA has been doing this "all in one board" design for a few years now. To 90% all these RCA's have backlight failures, because you can't adjust the backlight in the menu. It is always running at full tilt.

[sputnikoff]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Hi Budid some test and found voltage in off condition is 27 vdc and with power on jumps to 65 for 2-3 sec then slowly bleeds back to 27.With connector off its still 27vdc but jumps to 105 and stays for maybe 2 sec then bleeds back down again.I did check with panel lifted prior and all lamps seemed to light but was very quick.

[budm]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Well the Boost converter is working, the input Voltage to the boost converter is 27V, so when the LED driver shuts down you will only see the feeding the Voltage of 27 V.
105 V without LED connector in place and 65 V with connector is place shows that it does see the Load (LED's) but somehow it goes into shutdown.
You may have to find out next if the BL-ON and the Dim control signals are gone or not when the Backlights go off, this will be hard since it is all in one board so I doubt that there will be any test point labels for those two signals.
https://www.shopjimmy.com/catalogsea...Rca+RLDED3258A

[sputnikoff]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Your knowledge on this stuff is impressive for sure.I will do further testing ,thanks again for your dedication.

[neilc6]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Yeah, RCA has been doing this "all in one board" design for a few years now. To 90% all these RCA's have backlight failures, because you can't adjust the backlight in the menu. It is always running at full tilt.

You can adjust the backlight but you need to go into the service menu. With TV on, MENU-1-1-4-7 Under panel settings. Eeprom failure is also common in these all-in-one board models

[sputnikoff]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Hey bud Did some further checks used 0v battery on each string and got roughly 130-140 ma on each string.So no surprize bac to main board.

[CapLeaker]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

Hey bud Did some further checks used 0v battery on each string and got roughly 130-140 ma on each string.So no surprize bac to main board.

0V battery?

[sputnikoff]

Re: Rca 32" RLDED3258A-c only powers up momentarily.

ya misprint lol home with massive flu.I used 9 volt battery and leds all light up leds really well.