Some red, blue, green color lingered near the center of the screen for two seconds. Fuse on power board OK. Replaced power board and it did not solve my problem. Did flashlight test and I can see an image on the screen. What else beside power board could cause loss of picture and sound at the same time?
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
If you have no backlights, you likely have bad backlights. https://techhometravel.com/lg-ln-ser...ed-backlights/ -
Re: Samsung UN55J6200AFXZA Lost picture and sound.
Would the sound fail at the same time the back light fails?Comment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
You need to fix one problem at a time. Audio is totally unrelated to the backlights. There are a lot of reasons for no sound - volume set to 0, muted, wrong input, audio set to external. You need to get the backlights working first.
First test for Samsungs is to disconnect the cable between the main and power supply boards and plug the TV in. Backlights should come on.Comment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
can you tell me in other words?Some red, blue, green color lingered near the center of the screen for two secondsComment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
neilc6-- Thanks for the insights. Backlights do not come on when main board is disconnected from power board. I get the same result with original powerboard and the replacement power board I ordered. You stated audio and back lights are unrelated but because both audio and backlights went out at the same instant after TV was on for half an hour, I tend to think that it was only one thing which failed in that instant. I checked to make sure it was not a failure of wall current to the TV.Comment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
Davi.p-- The color which lingered near the center of the screen very briefly reminded me of three paisley or tear drop shapes wrapped around each other.Comment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
Test the voltages at the connector on the powerboard with EVERYTHING hooked up, it's the connector that the cable from powerboard to mainboard hooks into, most times there's a legend/map nearby that gives the expected voltages, you measure them with your mutimeter, set meter to 20 vdc then report them, put neg probe on chassis metal ground, pos probe on pin of connector, measure in standby take note, leave probes where they are then power on tv and again take note of voltages, report them here, example pin 1-ps-on-0 volts standby-power on-3.3 volts.Comment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
Are you getting voltage on CNM803 pins?Last edited by nomoresonys; 04-14-2021, 05:31 AM.Comment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
Check the voltage on J832.Comment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
Mmmmh, i don't know the word lingered but clearly you are trying to describe me the start of an animated logo at power up. But protection takes place because of a led lamp problem. You can build a very primitive B.L. tester with a diode bridge, a cable, a power resistor or some. YTube is full of those schemes. So you can test the strips without open screen, by the first, then you dismantle it if BL is KOComment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
At CNM803, I can access pins 1,3,5,7,9. On standby, pins 1,3,5,7 read 11.15 volts. Pin 9 reads zero. With TV powered on, pins 1,3,5,7 read 12.76 volts and pin 9 reads zero. At J832, I read 11.15 volts in standby and 12.76 with TV on.Comment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
Very carefully check the voltage of CP810S, meter set to 600 vdc, careful what you touch this is the HOT/DEADLY side of the powerboard, with a probe on each leg what voltage do you get? Check it in standby which is powered off and when powered on, when powered on should prolly be around 400 volts if this checks ok, next I would take powerboard out and inspect the solder joints real closely and re-flow any that look suspect, google images is your friend for how bad joints look if needed. Thats just 2 easy tests, it probably is bad backlight/s, be very careful if you have to tear it down to backlights these sammy UN models are tricky, watch a least a few how to youtube videos to get the gist of it, oh and the panels are VERY flimsy and easy to break too.Last edited by nomoresonys; 04-15-2021, 04:22 AM.Comment
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Re: Samsung UN55J6200AFXZA Lost picture and sound.
I checked voltage at CP810S on both the old power board and the replacement power board I installed. Voltage for both boards was about the same 165 on standby and 390 when powered on. I did not see any suspect solder joints. If it is a backlight problem, would failure of one LED make all of them go out? Would backlight failure cause the loss of sound at the same instant? ThanksComment
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Hi, I have a Samsung UE50TU with:
- sound and backlight, but no picture
- when it arrived, it had a picture for a few seconds
- it keeps rebooting
- without ribbon cable between the two panel boards, it does not reboot but I have no picture
- without cable between mainboard and lcd panel, it does not reboot (but obviously i have no picture)
- when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.
- without cable between mainboard and lcd panel and with a jumpered... -
I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.
I ordered a supposedly ‘new' Tcon board this time, and... -
Hello everyone,
Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
Anyway I still fully expect that there has been something seriously damaged... -
Hi all
I was just given a Samsung TV with the issue. I read various threads and videos and attempted the ribbon tape method to gain an image, but no luck.
Symptom:
No picture no sound.
When I plug in the power cord, Backlight LED turns on for a half second and then turns off. The red LED next to the power button located center bottom flashes 2 or 3 times. When the power button is pressed after, it does the same thing.
No sound at all.
What I tried:
1. I tried unplugging the left or right ribbon... -
Hello all,
This is my first post, but long term lurker on the form learning as much as possible about these TV's. I was given this TV as due to a power outage of constant On/off of power to TV. The TV originally would just click on and off (Typical Reboot Cycle). I opened the back of the TV, and troubleshooted by taking the 96 pin LVDS off one at a time to see if I had a picture on either side. I finally fixed the reboot cycle by finding the error on the left side of the screen off connector CN 1301, and the TV would stay on. Further troubleshooting led me to the driver boards where...
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