RCA LED50B45RQ LCD Flatpanel powers off right away

Collapse
X
Collapse
 
  • Page of 2
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
  • SurrealMustard
    Badcaps Veteran
    • Jan 2015
    • 486
    • The United States of America
    #21
    Of course! Why didn't I think of that sooner!

    Originally posted by 102mm
    I just repaired this set. it was the LEDs shorted for me. disconnecting them i was able to power on just fine. when i opened it up i found LEDs on a few strings shorted.
    Ah, I think you might be right. Can't believe I didn't think to try that earlier, but it does indeed power on and run just fine with the backlights disconnected. Looks like I'll be exploring that as the next plan of action with this thing.

      Comment

      • SurrealMustard
        Badcaps Veteran
        • Jan 2015
        • 486
        • The United States of America
        #22
        Replaced bad backlights!

        Backlights indeed. Replaced a couple strings, and this one is back in operation.

          Comment

          • DRLDallas
            New Member
            • Jan 2018
            • 1
            • United States
            #23
            Re: RCA LED50B45RQ LCD Flatpanel powers off right away

            Didn't want to start a whole thread for what is hopefully a super easy question. I've got a RCA LED55C55R120Q TV and the backlights have recently stopped working. Everything I've seen here indicates it is most likely bad LED's in this model, but I was hoping to verify before opening the TV. I have a RE46HQ1640 power supply. When I turn on the TV the backlights fire for a split second, then go off. If I measure from LED+ (either one) I get a top voltage of about 130VDC as the backlights flash, then it rapidly decays to 0V over about 35 seconds. The LED- give me a reading of 48.6mv which could just be meter error. If I unplug the LED connector and power up the board, I get 230V on the LED+ terminals and the same 48mv on the LED-. I don't have the test equipment beyond a multimeter.

            Is this what the power supply would act like if I had 'bad leds'?

            Oh an occasionally the backlights will actually come on but rarely. I haven't been able to reproduce yet to test voltages in that state.

              Comment

              • dskall
                Badcaps Legend
                • Oct 2016
                • 2905
                • usa
                #24
                Re: RCA LED50B45RQ LCD Flatpanel powers off right away

                I would say open circuit in led's. Bad led or bad connections
                I assume no responsibility for any stupid suggestions I might post.

                  Comment

                  Previous 1 2 template Next

                  Related Topics

                  Collapse
                  • malogro
                    Acer Nitro 5 AN515-55-55M1 [GH51G mb] powers on, no vcc_core
                    by malogro
                    Hello all,

                    I'm stumped on this guy, so wanted to see if anyone has any further ideas:

                    Intro:

                    This is an Acer Nitro 5 AN515-55-55M1 with unknown prior history (bought "as-is" on eBay). It charges the battery and powers on from both AC adapter and battery, so I think this rules out main power issues.

                    Upon attempt to boot, it will "reboot" (meaning powers down and then powers on again) only once, and then stays stuck in a status of lights on / no post / no monitor. Powering on with fn+esc maxes out the fans on first boot attempt,...
                    04-14-2023, 04:44 PM
                  • jose6326
                    Samsung s32d850t powers off
                    by jose6326
                    Powers on as normal shows an image then powers off after 10 seconds

                    I have to unplug it from the wall and replug to get it to turn back on but then shuts off

                    No blown caps
                    I searched for this model but nothing comes up...
                    3 Photos
                    11-29-2024, 11:21 PM
                  • simwalsh
                    Philips 47PFL4606 Powers on, works normal then powers off after a minute
                    by simwalsh
                    Hi,
                    I am new to this forum and have searched for some answers with problems similar to mine.
                    Philips TV powers on as normal for about a minute or less then click and no power at all not even standby light. If i disconnect from mains and reconnect it will power on again but for a shorter time. Once i leave it disconnected from main for a longer time it will power on for a longer period the next time.

                    It sounds like a power supply issue?

                    I have the board out and want to run some tests. Not sure what i should be doing but i put a 1k resistor across SB and +5v...
                    12-04-2023, 04:03 AM
                  • SarcasticOP
                    General question about MacBook power rails for repair.
                    by SarcasticOP
                    I am looking at an A2337 and found this for the order of power rails and what they do. Can this be confirmed before I dive into hunting down power rails that do not exist or are not neccisary?
                    • PPBUS_G3H (12.6V-12.8V)
                      • This is the main power rail that supplies power to the entire system. Check this rail first, as it must be present for other power rails to work.
                    • PP3V42_G3H (3.42V)
                      • This power rail is derived from PPBUS_G3H and is used to power the SMC (System Management Controller) and other essential circuits. It should be present if PPBUS_G3H is working correctly.
                    • PPVRTC_G3H (3.3V)
                      • This
                    ...
                    12-12-2024, 05:50 PM
                  • CornholioGSM
                    Dell P2720DC - Powers on only in test mode
                    by CornholioGSM
                    Hello
                    I have Dell monitor P2720DC.
                    Monitor powers on without problem, but shows only panel test - WRGB filled display - and i am unable to exit this mode...buttons does nothing.
                    Is here any fix for this?
                    Maybe reprogramm SPI with working img ?

                    Monitor board is 715GA309-M02-000-0H5I...
                    02-15-2025, 10:21 AM
                  • Loading...
                  • No more items.
                  Working...