Sony XBR-65X750D Horizontal lines bottom of screen

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Hi, While I am waiting for the 110ohm ¼ watt resistors to show up in the mail, I decided to “tin” the resister contact points with the most pointed soldering iron I have. In the process, I de-soldered the resister next to it but it did appear to have one end broken already. Anyway, I am posting the picture as it shows on the TV now in hopes that it might give a clue to a possible cause of the problem(s). Originally, I was experiencing horizontal lines only 6 inches up from the bottom, now I have horizontal lines over the entire display. Please see attached pictures of the TV (upside down). The first picture shows where the horizontal lines used to stop. Thank you again for the help.

These are all gate driver signals. Its been kind of a mystery to me what removing 1 or more should do. My understanding is should have no effect as the duplicated gate drivers lines on the other side of the panel will just take over.

But this is all before whatever damage to the logic caused by the fault.

So best path would be to remove all to see how it looks and put back one by one. But since you don't have the necessary equipment, seems not a possible path.

[ggil44]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Hello Howardc64, Yes, it is strange to me too. Shouldn't it have responded like you suggest when I masked off the contacts from the T-con board? I am beginning to think this TV is a lost cause beyond my capabilities. I got my 100ohm 1/4 watt resistors today and they are giants compared to the resistors I am trying to replace (see picture) The two "dots" between the resistors and the penny are the resistors of equal size to those that burned out. See picture. Regards, Gil

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Hello Howardc64, Yes, it is strange to me too. Shouldn't it have responded like you suggest when I masked off the contacts from the T-con board? I am beginning to think this TV is a lost cause beyond my capabilities. I got my 100ohm 1/4 watt resistors today and they are giants compared to the resistors I am trying to replace (see picture) The two "dots" between the resistors and the penny are the resistors of equal size to those that burned out. See picture. Regards, Gil

I can take a look for you with better soldering tools if you want to bring it by Redmond/Sammamish area.

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Can you post a pic of the CLK1-CLK8 on the other side of the panel? I wonder if there is failure there and now depends on the side with burn marks.

[ggil44]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Hi Howardc64, The Resistors on the Left side appear to be OK (see pictures). I just purchased from eBay some 0805 100ohm resistors and a digital soldering iron with adjustable heat settings in hopes that it might enable me to reinsert the burnt resistors. Thinking back, when I was masking off the ribbon cable from the T-Con board I smelled burnt components 1 or 2 times. I am wondering if I was the source of the burnt resistors because even though I tried to be careful, I may have not reinserted the ribbon cable correctly. Anyway, I am just second guessing myself right now. Thanks again for your help. The “new” resistors and soldering iron should arrive the middle of next week. Regards

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Hi Howardc64, The Resistors on the Left side appear to be OK (see pictures). I just purchased from eBay some 0805 100ohm resistors and a digital soldering iron with adjustable heat settings in hopes that it might enable me to reinsert the burnt resistors. Thinking back, when I was masking off the ribbon cable from the T-Con board I smelled burnt components 1 or 2 times. I am wondering if I was the source of the burnt resistors because even though I tried to be careful, I may have not reinserted the ribbon cable correctly. Anyway, I am just second guessing myself right now. Thanks again for your help. The “new” resistors and soldering iron should arrive the middle of next week. Regards

I assume power was off when you were doing masking or any unplugging of cables on the TV? If not, certainly risks. Also ribbon ables insertion can be tricky to seat properly without magnifying eye wear. There are notches on both side of the ribbon that needs to be seated properly. But not fully seating probably shouldn't cause shorts.

Do resistance checks on both side of the CLK1-8 resistors on the non burnt side and cross check against the burnt side. This may provide some hints.

[ggil44]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Howardc64, yes, I did unplug the power with each change in the ribbon cable masking. I tested the resistance of both sides and from the test point to ground I got a consistent 4.4mohms and across the resistors I got 101ohms to 105ohms depending on how good of a connection I could make. So, I guess we're back to square one?

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Howardc64, yes, I did unplug the power with each change in the ribbon cable masking. I tested the resistance of both sides and from the test point to ground I got a consistent 4.4mohms and across the resistors I got 101ohms to 105ohms depending on how good of a connection I could make. So, I guess we're back to square one?

Thanks. Was just curious if both side had any differences. Sounds like no so no clue for us unfortunately.

[ggil44]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

My needle nose soldering iron and the 0805 100ohm resistors finally arrived. After a lot of trial and error, 0805 resistors are still pretty small, I think I have stumbled on a way to solder a lead wire on to the ends of the resistor, scotch tape. I tape half of the resistor to a piece of paper then scotch tape the tiny wire leads down so they lay on the edged of the resistor for soldering and with a little bit of flux and a hot soldering iron I can solder the leads on the resistor. Well, it's not quite that easy but much easier than trying to hold it in place with a tooth pick. Now I have to figure out how to keep the ends in place when I solder the end to the circuit board, they're so small and short that they become un-soldered from the heat transfer up the short wire. I tried heat shrink tubing but it really isn't small enough, also thinking about glue or clear paint to keep the resistor end in place when I solder the other end to the circuit board. I have done some end to end like most resistors but they are so “big” that there isn't much room for the wire and I know they will melt both sides of the wire and fall off. So I am going to try edge soldering in hopes of being able to get the resistor further away from the soldering point. (see pictures). I might try gluing the resistors in place in hopes that the glue will keep the wires connected at the resistor when I solder them in circuit. I will keep you updated when (if) I successfully solder the resistors in place. Have a great 4th of July. Regards, Gil

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

My needle nose soldering iron and the 0805 100ohm resistors finally arrived. After a lot of trial and error, 0805 resistors are still pretty small, I think I have stumbled on a way to solder a lead wire on to the ends of the resistor, scotch tape. I tape half of the resistor to a piece of paper then scotch tape the tiny wire leads down so they lay on the edged of the resistor for soldering and with a little bit of flux and a hot soldering iron I can solder the leads on the resistor. Well, it’s not quite that easy but much easier than trying to hold it in place with a tooth pick. Now I have to figure out how to keep the ends in place when I solder the end to the circuit board, they’re so small and short that they become un-soldered from the heat transfer up the short wire. I tried heat shrink tubing but it really isn’t small enough, also thinking about glue or clear paint to keep the resistor end in place when I solder the other end to the circuit board. I have done some end to end like most resistors but they are so “big” that there isn’t much room for the wire and I know they will melt both sides of the wire and fall off. So I am going to try edge soldering in hopes of being able to get the resistor further away from the soldering point. (see pictures). I might try gluing the resistors in place in hopes that the glue will keep the wires connected at the resistor when I solder them in circuit. I will keep you updated when (if) I successfully solder the resistors in place. Have a great 4th of July. Regards, Gil

tacking on short wire to 0805 probably requires quite a bit of microsoldering experience and skill. iPhone/Macbook repair pros use tiny pad repair kits to rebuild missing pads. Probably need to be really good with micro pencil soldering iron + heat control + epoxy + UV cured masks. Note his binocular microscope for microsoldering (but probably can't use on panel buffer boards while its installed and angled even if have microscope) However, headwear magnifier is probably good enough. I use this all the time ( link )

https://www.youtube.com/watch?v=BpTn...airs-JesseCruz

[ggil44]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Hello, I actually did it. At first I thought I had done it but when I checked the picture there was no change. I went back and found the wire for the resistor to the left of the originally burnt out one that I was only going to replace had one lead that wasn't soldered to the test point. I re-soldered it and checked the picture again and now it is back to the way it was when I first asked about it. (Lines about 6 inches up from the bottom of the screen). At this point, I consider that a win but a lot of work just to get back to my starting point. I'm not sure the original burnt out resistor is the problem with the lines at the bottom of the screen since I believe I have successfully soldered the new resistor in it's place. So I am not sure where to go from here or just leave it.

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Hello, I actually did it. At first I thought I had done it but when I checked the picture there was no change. I went back and found the wire for the resistor to the left of the originally burnt out one that I was only going to replace had one lead that wasn't soldered to the test point. I re-soldered it and checked the picture again and now it is back to the way it was when I first asked about it. (Lines about 6 inches up from the bottom of the screen). At this point, I consider that a win but a lot of work just to get back to my starting point. I'm not sure the original burnt out resistor is the problem with the lines at the bottom of the screen since I believe I have successfully soldered the new resistor in it's place. So I am not sure where to go from here or just leave it.

Hard to tell from pic what was done due to the coating that probably holds the resistor in place.

Did you replace just 1 resistor or all 8?

Anyway, if no easy way to remove all 8 resistor and solder back 1 by 1 to attempt repair by relying on the other 8 gate drivers from other end of the panel. Perhaps just quit while ahead

[ggil44]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Hi Howard, I only replaced the 2 burnt resistors because when tested with a volt-ohm meter, the other 6 tested “normal”. I used Goop glue to glue the 2 0805 resistors in place in hopes that they would not move while soldering the leads to the test point on the board, act as an insulator so there would be no short circuits and that heat wouldn’t travel to the resistor and un-solder at the resistor. It worked, not pretty in the picture but no one will see it anyway and the 0805 resistors, as small as they are, are about 5 times larger than the resistors I was trying to replace. Anyway, I am tired of trying to solder itsy bitsy teeny weeny resistors and it has been a lot of time for you and I just trying to get back to even, not ahead. So I guess I will put the TV back together and live with the lines at the bottom of the screen and hope it is a lesson learned that chasing some rabbits just isn’t worth the time and effort.
Thank you Howard and Lotas for your time and suggestions and standing with me through this convoluted process. You have been great and I do really appreciate it. I guess we can’t win them all. Best Regards,

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Just fixed one of these XBR-65X850D. Similar to OP's XBR-65X750D. 850D does have 2 flex from main to t-con compared to750D's 1 flex.

• Row anomaly would appear and disappear with a ~1s interval so could suggest t-con. But 1 black line was consistently present which may suggest the panel and/or buffer boards.
• Row drivers on left side of panel (looking from the back) was the culprit. Blocking them off got good picture. Was able to isolate down to CLK1-4 but couldn't get less, perhaps multiple row gate drivers failed.
• OP's failure was also on the left side according to burn marks but I had no burn marks.
• COF looked fine
• Row driver resistor array resistance same on left and right side of panel

I suppose could be on the panel side or t-con side. Need to buy a t-con ($25 on ebay) to find out. Maybe I'll just live with blocking out 4 gate driver lines

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Just fixed one of these XBR-65X850D. Similar to OP's XBR-65X750D. 850D does have 2 flex from main to t-con compared to750D's 1 flex.

• Row anomaly would appear and disappear with a ~1s interval so could suggest t-con. But 1 black line was consistently present which may suggest the panel and/or buffer boards.
• Row drivers on left side of panel (looking from the back) was the culprit. Blocking them off got good picture. Was able to isolate down to CLK1-4 but couldn't get less, perhaps multiple row gate drivers failed.
• OP's failure was also on the left side according to burn marks but I had no burn marks.
• COF looked fine
• Row driver resistor array resistance same on left and right side of panel

I suppose could be on the panel side or t-con side. Need to buy a t-con ($25 on ebay) to find out. Maybe I'll just live with blocking out 4 gate driver lines

Actually not quite fixed. Half of the panel with blocked off CLK1-4 has slight dark horizontal bands. CLK1-4 from the other half of the screen can't drive across the 65" panel.

So need to further reduce number of block off row gate drivers or find another fix.

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Actually not quite fixed. Half of the panel with blocked off CLK1-4 has slight dark horizontal bands. CLK1-4 from the other half of the screen can't drive across the 65" panel.

So need to further reduce number of block off row gate drivers or find another fix.

Was able to isolate to blocking off CLK3-4 but dark lines exist on the half of the panel thats blocked off.

Anomaly alternates between good picture and horizontal lines + screen door images shifted vertically every second. Does this strongly suggest fault could be on the t-con side so maybe worth trying a replacement t-con?

[ggil44]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Thanks Howard, for the update. Sorry to be so slow getting back to you. I kind of considered this thread to be dead after my last attempt got me back to the way the TV was when it first started giving me this problem. Glad to hear from you and that you have a Sony with a similar problem that I may be able to learn from. In my first opening post I stated “Hi, I have a Sony XBR-65X750D that has horizontal lines at the bottom 6 inches of the screen. I’m not sure if this is a panel issue or power supply/main board problem. I did replace the T-Con board without any change in the problem”. I imagine that it could be possible that I got a bad T-Con board from eBay but with it showing exactly the same problem on the TV, I didn’t think it was likely. I don’t have the problem with vertical ghosting like your 850D, I will be interested to hear your final solution and appreciate the info you are sharing. I will open it back up in the near future and try some of the fixes you did that helped solve the problem.
Thanks again,

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

oh well, replacement t-con. Same symptoms ( post #54 ) so fault on panel / buffer board side. Will try removing CLK3-4 resisters next since masking signals yield best result (but still dark black lines on that side of the panel)

[ggil44]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Sorry to hear that. I had the same outcome. If half the screen is not displaying then a new T-con would probably work. Lines on the screen are a stubborn problem and not easy to fix.

[howardc64]

Re: Sony XBR-65X750D Horizontal lines bottom of screen

Nearly fixed by blocking out VGH VGH_ODD VGH_EVEN from T-Con on the failed side of the panel. Now picture is great and just have 1 bright line (13 from top) and line 1-12 seems dimmer/discolored.

Note the TV is upside down in pic below.

Possible to do better than this? Maybe the panel fault is line 13 and VGH* so have to sacrifice one or the other? LCD panel is LG.