Hello I have a Samsung Plasma PN50B400P3D. I have tried replacing X and Y Main and have tested the Y Buffer board for continuity. The VA and VS reading are good. I am at a loss.
Thanks in advance.
Thanks in advance.
-
-
Re: Samsung PN50B400P3D Sound No Picture
Test pattern?I assume no responsibility for any stupid suggestions I might post. -
Re: Samsung PN50B400P3D Sound No Picture
On the logic board?Comment
-
Re: Samsung PN50B400P3D Sound No Picture
Comment
-
Re: Samsung PN50B400P3D Sound No Picture
Here is a picture of the components.Attached FilesComment
-
-
Re: Samsung PN50B400P3D Sound No Picture
Can you supply a focused close up picture of the board within the red box.Attached FilesWilling to help but I'm no expert.Comment
-
-
Re: Samsung PN50B400P3D Sound No Picture
Picture of the logic board!Attached FilesComment
-
-
Re: Samsung PN50B400P3D Sound No Picture
I think I might have confused yall. The VS and VA voltages are good when the y-main is disconnected (6pin to 6pin connector at the top). The y-main board we bought did the same as the original. Logic board blinks once every second when the y-main is disconnected.Comment
-
Re: Samsung PN50B400P3D Sound No Picture
Disconnect the LVDS cable from the logic board to the main board. Place a jumper across pins 3 & 4 of the little block with pins labelled 1,2,3 & 4. Power up the set and see if the test patterns are displayed.
If they are it would suggest a mainboard fault.Willing to help but I'm no expert.Comment
-
Re: Samsung PN50B400P3D Sound No Picture
You certainly are confusing when saying vs va ok when they aren't!. Also power wire to y main missing in your pic. This set about 2009 model and all indications are bad y or x side. It looks like y feeds x. The x should be disconnected and then check vs and va. Even though you have replaced the mains for both sides the buffers still suspect. One second flashing led on control board indicates good so what is it doing when y and x attached?. And my posts get tangled up too !!!Comment
-
Re: Samsung PN50B400P3D Sound No Picture
I have already tried disconnecting the buffers and x-main, and with the y main board I purchased still can not get readings. I am thinking I need another y-main.Comment
-
Re: Samsung PN50B400P3D Sound No Picture
Yes the Y side is the usual problem one in Samsung but when testing it is important to know year model as procedure different from 2010 on. The idea is to rule out boards one by one hence if x side is last in chain then test it first by disconnect etc, then proceed to y side disconnect , after that power board. The set isn't going to operate until vs and va are present with full hookup. Now just to throw in a spanner I have noted a couple of posts where even after tests indicated y or x problem it was actually power board and all I could surmise was that board Vs etc was breaking down when load applied. The logic board led flash pattern is also an indicator and should be noted down when all hooked up and not working - the flash pattern also altered from 2010. The screen output boards should be checked for shorts in the normal course and you have two of each to compare them one against the other.Comment
-
Re: Samsung PN50B400P3D Sound No Picture
Yes this is a 2009 model.Comment
-
Re: Samsung PN50B400P3D Sound No Picture
Hooked up a different power supply with the y-main isolated and still getting the same results. Thinking I have another bad y-main.Comment
-
Re: Samsung PN50B400P3D Sound No Picture
With your multimeter set to mid range ohms what readings do you get with red probe on vs input pin and black probe on gnd pin for your y and x boards all. Set off of course.Comment
-
Re: Samsung PN50B400P3D Sound No Picture
x-main vs=.024
y-main vs=1.123Comment
-
Re: Samsung PN50B400P3D Sound No Picture
And what readings do you get off the other 2 boards? That x main looks too low in comparison.Comment
-
Re: Samsung PN50B400P3D Sound No Picture
Power Supply Board
VA = 7.32 VS = 39.98
Not sure what other board you were talking about: logic or main?Comment
-
Re: Samsung PN50B400P3D Sound No Picture
Sorry you said y and x had been replaced so I assumed you now have 2 of each ?Comment
-
Re: Samsung PN50B400P3D Sound No Picture
O.K. I got you sorry about the confusion. I will check it for the other two boards. ThanksComment
-
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...
Comment