Re: LG 50PA5500 no picture
Really? So it'seasier to remove the buffer?
Really? So it'seasier to remove the buffer?
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Re: LG 50PA5500 no picture
Ok. Im just worried about breaking the y-sus board becauseof the cconnection to the lower board.Comment
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Re: LG 50PA5500 no picture
Is there a thread to get this buffer board off?Comment
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Re: LG 50PA5500 no picture
Well only thing you will see in other threads is the same as me telling you to wiggle and pull it LOL... Always see the person with the TV in front of them come back saying they did it and we sure were right about them being stubborn.
I sometimes pry them if they are that bad by inserting something flat between the boards and twisting it gently, I wrap insulation tape around the end of a wide flat tip screwdriver and use thatLast edited by newtothis; 05-14-2015, 08:15 PM.Comment
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Re: LG 50PA5500 no picture
Alright, alright! Lol! I finally got the upper buffer board disconnected. I connected the y-sus back up and turned on the tv. No picture.Comment
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Re: LG 50PA5500 no picture
Alright, alright! Lol! I finally got the upper buffer board disconnected. I connected the y-sus back up and turned on the tv. No picture. Could it be the psu?Comment
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Re: LG 50PA5500 no picture
That's as far as I can take you, Have to wait for Tom or someone more into plasma's.
Good LuckComment
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Re: LG 50PA5500 no picture
Thanks! I'll waitComment
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Re: LG 50PA5500 no picture
OK you got a digital multimeter?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50PA5500 no picture
Im getting a new one today. While i have your attention tom66, what should i be checking?Last edited by graveboy81; 05-15-2015, 07:20 AM.Comment
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Re: LG 50PA5500 no picture
You need to check voltage test points.
Vs and va located on the power supply.
Vsc and -VY on the ysus
And z-bias located On the z-sus.
The voltages should match the panel sticker like so:
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Re: LG 50PA5500 no picture
With the power on right? Can i use a digital multimeter with ac/dc voltages up to 600v?Comment
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Re: LG 50PA5500 no picture
Yes, power must be on.
And use DC range. Do not test on AC range.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50PA5500 no picture
My multimeter is pretty old and its acting up. What would be a preferred multimeter for tvs in regards to peak voltages? I have my eye on one that can check up to 600v dc and ac, is that ok?Comment
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Re: LG 50PA5500 no picture
Yes - the highest voltages encountered are around 200V DC.
You will not be testing anything on AC.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: LG 50PA5500 no picture
So really don't need one that checks for voltages that high? Maybe 400v?Comment
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Re: LG 50PA5500 no picture
Most DMM's are 600v standard these days anyway, I started off with an $8 DMM and never had an issueComment
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Re: LG 50PA5500 no picture
Ok. I left my upper buffer board off, plug that back up? Also, the voltages from the picture should be at or around those numbers?Comment
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Re: LG 50PA5500 no picture
You can check the voltages required either with both buffers connected or both removed.Comment
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LG42PC3D -UD originally with green lamp but no display or audio.
Owner says was working, then went 'pop'.
All 5V caps bulging. replaced.
All PSU output voltages within spec but -Vy is low on YSUS.
One of three parallel fets between SUS_OUT and SUS_DN is zenering,
eventually shorts DG. Replaced all 3 - -Vy now OK.
Y scan buffer test point does not follow YSUS output below -50V
Note: This unit seems to expect YSUS output to park at -Vy in between
drive signal pattern periods. A replacement drive signal board confirms this....11-18-2021, 11:49 AM -
All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
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Hi guys! I realized you have a lot of knowledge here so i am hoping you could point me in right direction with my odd issue.
The Tv is a Philips 58PUS8545/12, it had no picture but working backlights.
Original T-con:
Opened the Tv and tested to unplug one ribbon cable at a time. With this test i could see that i got fine picture on both halves as long as there was only one ribbon cable connected, with two connected picture were gone.
First replacement T-con:
I thought it might be t-con and ordered new t-con from china(supposedly tested)... -
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... -
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...
Comment