This plasma turns on and off with chimes but there is no picture. Checked Vs and Va on the power supply and they were about 10V. No short detected at the supply input to the Xmain board (found repair kit for this problem). Appears that PSON is not coming from the logic control board. 5.3V is present at the supply to the control boards Not sure if I should try to trace it back to the main board or jumper PSON high. Will continue investigating.
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Re: Samsung PN42C430A1D turns on but no picture
Further measurements indicate the TV is powering up, but VSON isn't staying in the on state. In the off state, PSON is 3.3V and VSON 0V. When turned on, PSON goes low, VSON is at 3.3V, VS=212V, VA=54V but after the startup chime, VSON goes low and VS and VA voltages start dropping. I unplugged the connector to the Ymain board and it exhibits the same behavior. Not sure if the power supply is detecting a fault or if there is an issue with the PSON signal.Last edited by neilc6; 03-03-2018, 09:43 AM. -
Re: Samsung PN42C430A1D turns on but no picture
Tried to do a test by jumpering pins 3-4 on the header connector of the logic board and disconnecting the cable to the main board but VSON still didn't come on. Looking at a schematic for another plasma power supply, VSON should switch a transistor pulling the leg of an optoisolator to gnd. VSON is not shorted so I believe the issue is with the logic control board. Luckily used boards are plentiful on ebay and only around $5 so worth a gamble.Comment
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Re: Samsung PN42C430A1D turns on but no picture
Thinking about this some more, there are ribbon cables coming from the Xmain and Ymain boards going to the logic control board. Error signals on these lines could cause VSON to shut down. Will need to do some more probing.Comment
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Re: Samsung PN42C430A1D turns on but no picture
Bumping this thread. Any input here?Comment
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Re: Samsung PN42C430A1D turns on but no picture
I don't know if this is similar to your set. May be of assistance to you.Willing to help but I'm no expert.Comment
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Re: Samsung PN42C430A1D turns on but no picture
Try disconnecting the flat white ribbon cable that connects from the logic board to the Ysustain. It's your voltages come up then it's most certainly a problem with the YsustainDid I leave the soldering iron on?Comment
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Re: Samsung PN42C430A1D turns on but no picture
Disconnected the ribbon cable from the Ysus and the voltages stay up.
Vsc and Ve measure ok on the Ysus. Pulled out Ysus and inspected. No cold solder joints on coils and parts attached to heatsink not shorted. Shopjimmy repair kit for this board replaces all the FETs and Diodes attached to the heatsink.Last edited by neilc6; 04-05-2018, 07:11 PM.Comment
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Re: Samsung PN42C430A1D turns on but no picture
I would try disconnecting the buffer boards from the Y main and power up to see if voltages stay up if so then you have buffer board failure and Y main is probably okLast edited by freakaftr8; 04-06-2018, 09:51 PM.Did I leave the soldering iron on?Comment
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Re: Samsung PN42C430A1D turns on but no picture
No its most likely the buffer board. This TV looks like it most likely has just one buffer board that spans from the top to the bottom so you would have to find a replacement.Did I leave the soldering iron on?Comment
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Re: Samsung PN42C430A1D turns on but no picture
Let us know if it worked. I think it will.Comment
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Re: Samsung PN42C430A1D turns on but no picture
Got a replacement board and I think the new board caused a short in the Y-main. PS clicks and no more chime so it is worse. Old board put back in has the same new symptoms. Think I'll scrap the tv for the power supply and main boards.Last edited by neilc6; 04-27-2018, 10:44 AM.Comment
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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.
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This was my main TV for the last 6 years. I'm not inclined to throw out a $2600 TV so quickly so I'm trying to investigate the issue.
Problem
TV was disconnected from power for 6 months during construction. When I plugged it yesterday picture was fine, after 30 seconds it dimmed then started developing horizontal lines, picture then starts to ghost vertically until it degrades into vertical streaks. TV always displays a perfect picture when cold. I can unplug TV for 5 minutes and plug it back in and picture is restored for 20 seconds. I can also keep it in standby mode... -
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I ordered a supposedly βnew' Tcon board this time, and... -
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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