The video flickers. Cannot find any service manual or schematic for this tv. It is a tv/dvd combo. Here are some pics of the unit, assuming the small boards are the buffer. Here are some pics of the boards. Not much too see. Do the boards with the ribbon cables control the video, or is there a power supply or backlight issue.
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Last edited by tech2014; 08-26-2014, 12:57 AM. -
Re: RCA 42" RLDEDV3988-a flickering video
Can someone tell me what could cause this issue? -
Re: RCA 42" RLDEDV3988-a flickering video
obviously its not just me, nobody has a sniff about this tv lol.Comment
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Re: RCA 42" RLDEDV3988-a flickering video
If you put it on a blue screen does it still flicker? Need to see if its the image or the backlights.Liberating magic smoke one part at a timeComment
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Re: RCA 42" RLDEDV3988-a flickering video
I am having the same issue with mine .. hope we can get this figured outComment
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Re: RCA 42" RLDEDV3988-a flickering video
Mine flickers about once per second regardless of what is on the screen. I can still see the image in the background when it flickers so I am assuming it has something to do with the back lightingLast edited by garfield-cat; 08-27-2014, 11:57 AM.Comment
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Re: RCA 42" RLDEDV3988-a flickering video
I can see the backlight LEDs flashing. I thought it could be an inverter board but can't find one. How do I get a blue screen? Is it a test screen?
I also cannot find a schematic or service manual for this tv.
The customer told me she has another RCA tv(the exact same model) and it also flickers. This tv is in warranty so she is going to send it for repair. I told her to let me know what they find so I can fix. I will let you know garfield-cat. Btw, hows the weather out there in NS?Comment
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Re: RCA 42" RLDEDV3988-a flickering video
Usually if you set it on a source with no signal you will get a solid blue screen. But it sounds like it is a common problem in the back light of this model to have 3 with similar troubles in quick succession. If you get into the settings you may be able to find a setting labelled Energy Saving or something along those lines. Turn it off and see if it quits pulsing. I think it may be using pulse width modulation to keep down the power usage but it is set at too low of a frequency.Liberating magic smoke one part at a timeComment
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Re: RCA 42" RLDEDV3988-a flickering video
I checked the voltages in the inverter cct and used alligator clips to test. When I am taking voltage the backlight comes on and stays on. I found the voltages should be about 30V but it was moving around between 28-61 volts. Could this be a cap issue or semiconductor.Comment
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Re: RCA 42" RLDEDV3988-a flickering video
if the only thing you did was clip in your test leads it sounds like something is loose. However if the voltage is still pulsing while your clipped in look at the power supply, I suppose it could be faulty caps. BTW this tv wont have an inverter circuit as it is using leds, just power to feed the strings of leds and some kind of feed back for fault protection.Last edited by Caleb; 08-27-2014, 04:30 PM.Liberating magic smoke one part at a timeComment
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Re: RCA 42" RLDEDV3988-a flickering video
Hello, firstly check the voltages coming out of the main psu and check that they are in spec.
I have seen a tv almost exactly like this but with a different inverter that had the same problem my mate ended up replacing the main board and the psu as the main board was generally glitchy and the psu was out putting bad voltage.Last edited by ReeceyBurger123; 08-27-2014, 07:29 PM.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
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Re: RCA 42" RLDEDV3988-a flickering video
I fixed the TV. I was doing voltage measurement on the secondary side inverter section and found an open surface mount resistor. Replaced the part and problem solved. Thanks for the input guys.Comment
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Re: RCA 42" RLDEDV3988-a flickering video
Weather here has been nice most of the summer.
Tech2014 .. can you lead me in the direction of where you found the open resister so I can see if it is the same issue I am having?
what size resister is it?
ThanksComment
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Re: RCA 42" RLDEDV3988-a flickering video
Glad you found it! Can you post the location and part number so people reading this thread later can find it easily.Liberating magic smoke one part at a timeComment
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Re: RCA 42" RLDEDV3988-a flickering video
Hi I also have the same TV model, and need information on how to find the problem (resister) or where to look ???Comment
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Re: RCA 42" RLDEDV3988-a flickering video
He seems to have said that he found the open resistor while checking voltages in the secondary side of the inverter section...
Maybe something to do with lamp current sensing\feedback etc. Check maybe the lamp feedback circuit.
If it's open circuit it might be visibly bad, if you're lucky."Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Re: RCA 42" RLDEDV3988-a flickering video
having same problem but tv is black with only flickers of the image ???? Tech2014 ????Comment
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We will of course begin with the obvious (checking lid signals), but I couldn't help but notice these three boards were all 32GB variants. Has anyone noticed an issue relating to these 32GB boards in particular? I of course don't think it's a RAM issue, but it's bizarre... -
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Hello,
The monitor started off showing flickering thin (1 pixel) lines horizontally every say 3mm..
They are black on the right and gradually fade to nothing on the far left.
They start either after 5 mins or up to 2 hours after so annoying for testing.
They flicker continuously very fast! With a slight pause milli-second every second.
Initially I cleaned the LVDS cable and connected to the T-Con and then it worked fine for 3 weeks but not sure if this was just co-incidence.
I tested each half by removing the first the left flex from... -
Good evening, gentlemen.
I have a problem with my monitor. It turns off after a few seconds or flickers. Shining a flashlight on the screen doesn't show any image, so I guess it's not the "2 seconds to dark" I read in the forum.
To turn it back on, I have to press the power button twice. Then after a few seconds it turns off again or flickers. See video.
https://drive.google.com/file/d/1L6S...ew?usp=sharing
Things I tried
- Bought a new AC adapter thinking that was the problem but the problem...
Comment