Re: Samsung UA40J5100 LED SMPS voltage
Hi RJ,
After over a year, the TCON I ordered finally arrived on our supply ship. I fitted it and the set is working fine. Thank you SO SO MUCH for your kind advice. When I find myself in Canada, I will look you up to buy you a beer.
Thanks again....
rowage
Member
Last Activity: 10-12-2022, 01:28 AM
Joined: 09-10-2013
Location: Palmerston Island
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Re: Samsung UA40J5100 LED SMPS voltage
OK thank you RJ. I presume the next step is to replace the TCON then?Leave a comment:
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Re: Samsung UA40J5100 LED SMPS voltage
Wow, ok thanks for that. I will try to check those pins but I am not sure I have the skills. If I touch two of the 12v pins together will I short anything out?
Cheers.Leave a comment:
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Re: Samsung UA40J5100 LED SMPS voltage
Soooo, since the first five on the MAIN are all 12.7v, but only the first pin on the TCON is 12.7v, does that indicate a faulty LVDS cable? Or are we sticking with the TCON being faulty?
Many thanks.Leave a comment:
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Re: Samsung UA40J5100 LED SMPS voltage
Hi RJ and nomoresonys. I tested the output pins on the MAIN as pictured. The first five inside the square I have drawn all read 12.7v with the LVDS connected. They rise to around 13v with the LVDS disconnected.
All the other pins in that line are 1.something volts. Mostly 1.2v.
The first five pins that I numbered on the TCON in the last pic, they are all reading the same as I last stated. Only the first one reads 12.7v. I confirmed the ground point each time I tested a pin by going back to both sides of the TCON fuse...Last edited by rowage; 03-02-2020, 02:51 AM.Leave a comment:
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Re: Samsung UA40J5100 LED SMPS voltage
Hi RJ, what I mean to say is that I took the end of the LVDS ribbon from the MAIN and plugged it into the TCON, then plugged the TCON end of the LVDS into the MAIN. So I didn't turn it upside down, I just reversed it. Contacts still all facing down onto the board contacts.
Likely a TCON fault then?
Thanks again.Leave a comment:
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Re: Samsung UA40J5100 LED SMPS voltage
Hi RJ and Robinsosa,
I disconnected both cables to panel and tested VCC 3.3V - no change.
As per document that Robinsosa posted, no LED's light up on TCON except sometimes a brief flash from one of them on startup.
But fuse on TCON is not open so does that mean it is the LVDS cable or the TCON? I don't know if this is a no-no, but I reversed the LVDS cable and it made no difference either.
Thank you once again for your kind help.Leave a comment:
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Re: Samsung UA40J5100 LED SMPS voltage
Hi RJ,
Thank you again for your kind and fast response. I did clean (with isopropyl) and re seat all three flat cables. I have tested:
VCC 3.3V - nothing (1.1 to 1.3mV)
VCC 1.8V - nothing (0.2mV)
VCC 1.15V - nothing (0.1mV)
Both sides of fuse on TCON are still 12.68V. I do not have an oscilliscope to check the LVDS cable sorry.
Then I saw the test points for the LVDS input to the TCON so I tested those. As per picture:
1: 12.7V
2: 0.531V
3: 0.718V...Last edited by rowage; 02-28-2020, 05:27 AM.Leave a comment:
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Re: Samsung UA40J5100 LED SMPS voltage
Thank you fro your fast response. I have attached images as instructed. I removed the ribbon cables coming out of the TCON one at a time. Neither made any difference. No picture on either side. Just backlighting only.
I appreciate your continued assistance....Leave a comment:
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Samsung UA40J5100 LED SMPS voltage
The v outputs on the SMPS to the MAIN are supposed to be 13v according to the writing on the SMPS board. They are all reading 12.68v when tested. Is this too low?
The symptom is that the backlights come on but there is no picture. The LED's on the TCON do not come on (sometimes TCON LED2 will flash briefly on startup). Voltage at both sides of TCON fuse is also 12.68v.
The power LED flashes five times after power on. After the second flash, the backlights flicker. Then after the fifth power LED flash, the backlights flicker again. Then the power LED stays off, with the...Last edited by rowage; 02-26-2020, 03:35 AM. -
Panasonic Viera TH-P42X20A Power Issue
Hi guys, I have come across this set which will not fire up. No physical damage to PDP.
I replaced the SMPS (LSEP1287AN), but the symptoms were identical.
When 240v supplied:
Three clicks in quick succession from SMPS
Flashing green LED on front bottom centre for about 4 seconds
One click from SMPS
Red LED once on front bottom centre, pause, repeat red LED (continues)
What I did then:
Isolated every cable to every board one at a time. None made any difference EXCEPT P6 (on SMPS) to A6 (on MAIN). When... -
Re: Samsung PS50Q91HD sound but no picture.
Many thanks mateLeave a comment:
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Re: Samsung PS50Q91HD sound but no picture.
Tom, can you recommend any board repairers in Australia? Can't seem to find any. Thanks.Leave a comment:
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Re: Samsung PS50Q91HD sound but no picture.
OK, the green light is on the Y-main is illuminated, so it's the Y-main. Tried individually isolating the buffers, no change. I'm guessing a buffer has failed, causing the main to fail, and that I'm just going to have to replace all three. Which means this set is BER.
Thanks for the help with identifying the problem!Leave a comment:
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Re: Samsung PS50Q91HD sound but no picture.
Hi Tom, sorry I did not get back to you today, had a hectic day at work. I will check the TV tomorrow if all goes according to plan, and get back to you. Thanks for your advice.Leave a comment:
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Re: Samsung PS50Q91HD sound but no picture.
Thanks Tom, will do tomorrow. Will get back to you :-)Leave a comment:
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Re: Samsung PS50Q91HD sound but no picture.
Hi again Tom, I found this quote from you regarding the same TV model, so I thought I'd reproduce it here and answer the questions you asked on that post as you must suffer from a lot of repetition and I would like to avoid it for you if I can :-)
- Turn out all the lights in the room and make it very dark. Does the screen appear to glow very faintly? There might be an image or it might just be a dark level glow. If it does glow, it is likely the Z-sustain/X-main that is at fault. If it doesn't, it's a Y-sustain/Y-main, buffer...Leave a comment:
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Re: Samsung PS50Q91HD sound but no picture.
Sorry, I lied. The light was on the Input board, not the Y-main. There are no lights on the Y-main.Leave a comment:
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Re: Samsung PS50Q91HD sound but no picture.
Yes, a continuous light. Green from recollection but might possibly have been red.
Thanks Tom.Leave a comment:
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Samsung PS50Q91HD sound but no picture.
Hi everyone,
Have this TV and recently encountered this problem. Can change channels, etc (I know this from the change in sound) but no picture - no light coming from screen at all.
So I grabbed out my DMM and tested:
Voltages from PSU:
Vs according to sticker is supposed to be 207v
Va is supposed to be 63v
Tested Vs to X and Y mains - all 208.5v
Tested Va - 63.5v
Then I isolated each Y buffer individually - no change.
Isolated Y-main - no change.
Isolated X-main - no change.
...
No activity results to display
Leave a comment: