I have a 60PM6700 that turns on but with no picture. I am sure I have traced it down to a bad EBR73710601 upper buffer board. All power supply voltages were bang on to both the ysus and zsus board. When both buffer boards were hooked up I could hear the ysus board "buzzing" on and off every 2 seconds and both VSC & VY voltages were jumping very erratically. I Disconnected the bottom buffer and same thing. Disconnected both buffers now VY has 185 VSC 0. I hookup the bottom buffer and disconnect the top and same VY has 185v and VSC 8.3V but I now I get some pixelated image on the bottom of the screen ? What you think, Shorted upper buffer ?
-
-
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
I also did a continuity test on the buffer ribbon terminals and it does appears there is a couple shorts on the upper board. -
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
Check the joints under the transformers on the ysus before replacing the buffer.Comment
-
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
You said VSC of 0V with the bad buffer removed, I would recheck, as would expect around 150V. There may be another fault...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
-
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
I think the VSC passes through both buffers, If one is removed you may not be able to measure it.
I believe it enters the upper buffer, passes through p153, then to p152 to the lower bufferAttached FilesLast edited by R_J; 04-19-2018, 11:25 AM.Comment
-
-
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
I think you may be correct. I found the below thread with the exact same problem.
https://www.badcaps.net/forum/showth...3712701&page=2
Comment
-
-
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
Hi Tom, See page 2 on the link below......This guy really knows his stuff.....
"On this particular set it appears that Vsc is passed between the buffer boards by the Y-sustain. So indeed with a missing upper buffer you will not read Vsc. This is NOT the case for every plasma. They do things differently on different sets.
You need, in this case, to check Vsc with all boards in. If the voltage on the big 10R resistor is LOW after this, you may have a shorted buffer"
https://www.badcaps.net/forum/showth...3712701&page=2
Last edited by goldbird78; 04-19-2018, 01:28 PM.Comment
-
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
With just the one board in you should be able to measure the voltage on that R279 10ohm5w, it might check a bit high due to no load but I think it should be close.Comment
-
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
Nah I wouldn't trust a word that guy says I've heard he doesn't know shit about TVs.Hi Tom, See page 2 on the link below......This guy really knows his stuff.....
"On this particular set it appears that Vsc is passed between the buffer boards by the Y-sustain. So indeed with a missing upper buffer you will not read Vsc. This is NOT the case for every plasma. They do things differently on different sets.
You need, in this case, to check Vsc with all boards in. If the voltage on the big 10R resistor is LOW after this, you may have a shorted buffer"
https://www.badcaps.net/forum/showth...3712701&page=2Please 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
-
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
So you have a bad upper buffer and the lower works partly because it is missing the VSC, when a new upper buffer is installed I suspect the whole picture will be o.k.
Famous last words
Comment
-
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
Have one coming in from Quebec $50 shipping included.Comment
-
Re: LG 60PM6700 no image. Bad EBR73710601 Upper buffer board ?
problem was the upper buffer board.....nice cheap fix on this one.
Comment
-
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
LCD displays a 2nd image slighty offset vertically. And multiple pairs of black lines along the bottom. Probably common as google "TCL 49S405 double image" pulls up this ifixit post ( link ) with identical ( nearly, but their fault seems to be on the other half of the panel than mine ) problem without solution.
This one looks to be a more difficult to diagnose because most? of TCON seems integrated ( CSOT BGA on buffer baord) into the left panel edge board ( looking from rear of TV) There are 2 buffer boards for each 1/2 of the screen. Main connects to the left buffer board... -
The board is LA-F411P ,DELL 5590 ...
The screen polarises,no backlight,no image,only black screen,tried another screen,the same,so there is no backlight,but there should be an image when i shine a lamp behind the screen,but there is none...only dark screen...when screen is connected and i press F8 to turn the image over to the external monitor, the external monitor gets coloured bars ,but when i disconnect the cable from the EDP ,the HDMI picture is good...What could be the problem? I don't have another edp cable, but i measured it with meter and it comes out good...i am baffled......
Comment