Sony LED KDL-60EX700

[Davi.p]

Hi, the defect is the same as this thread:
https://www.badcaps.net/forum/showth...t=66458&page=4
i was hoping that the fault was the same but not, the ribbons attached to the screen doesn't react to any type of pressure, since in the Budwich's tv the problem was surely a missing signal, more probably VON, here i have dismounted the side metal bars and exposed the side drivers, carefully i have scratched the 4 testpoints covered with the usual green paint, the ones that comes from groups of more than a track so surely IC supply tracks, on both sides i have the VOFF(-5,5v), VON(34v), VCC(3,3v) and probably GND (0v), so i've made an attempt to cut the 3,3v line near the input on the external tab on the side that displays worse, the result is near the same as before (!) ...
surprisingly on the VON-VOFF-GND i have the same voltage and on VCC i have 2,6v! I don't understand from where it comes that 2,6v signal..
Any ideas?

[budwich]

Re: Sony LED KDL-60EX700

how about a picture of the side tab.
further, you make a bad assumption that the "unpowered side tabs", even if good have no impact on the picture. This is not true. They will act the same as a bad tab... maybe not shorted but loading.

Based on the video that I posted, I think you need to find where "15-18v" (not sure for all sonys... maybe that's your 34v... but that seems high) comes into the side tab.

re-reading your post... 2.6 is coming from the other side dropped after diode (.7) internal or otherwise.

one question... why did you cut the vcc line?

[Davi.p]

Re: Sony LED KDL-60EX700

you make a bad assumption that the "unpowered side tabs", even if good have no impact on the picture.

Yes, probably a side driver with a shorted output can load down the other side, but i tought it was a reversible operation, i was wrong also this, in fact, the 3,3v line came into the bottom lateral ribbon in many points, one bigger track and one little runs through the tab to the side driver, i first cut the bigger one and no changes (apart the tension on the tab from 3,3 to 2,6) after my post i decided to cut the other one and the tv flashed 2 times then gone OFF, now it would not come ON more.. only the relais click, no sound because diffusors are un unplugged.

Based on the video that I posted, I think you need to find where "15-18v" (not sure for all sonys... maybe that's your 34v... but that seems high) comes into the side tab.

Why?

re-reading your post... 2.6 is coming from the other side dropped after diode (.7) internal or otherwise.

but which diode?? No power lines runs from a side to the other, this has no sense..

one question... why did you cut the vcc line?

To disable all the worst video side part drivers..

[budwich]

Re: Sony LED KDL-60EX700

:-( "looks like Dr. Kildare kill the patient" .... :-((((

Are you able to reconnect your cuts to get back to where you started?

can you post a picture of the tab / area you were working on. Which side of the screen is this?

[Davi.p]

Re: Sony LED KDL-60EX700

Ah yes the cuts are correctly restored but obviously the thing doesn't power up, there are too much secrects that i can't understand, for example it's difficult to know why a missing signal can destroy a board! And never happened to me... i hope for a only stupid fuse on the tcon that gone bad..
Sorry for the picture but i have worked on for more than an hour, bent in two with back hurting, the tv was on the bed 'cause i have no big spaces where working on a so big screen, but now i have remounted the metal covers and moved it to another room, it's damned heavy to move it lonely..

[freakaftr8]

Re: Sony LED KDL-60EX700

That looks like vertical gate driving failure. There are no bands or issues spanning horizontally. Check connections on vertical gates and driver boards.

[budwich]

Re: Sony LED KDL-60EX700

I don't think so... this is a issue on the side... either the drivers are not being powered or otherwise. yes there are no horizontal lines but those lines aren't always there depending on what the driver issues are.

[Davi.p]

Re: Sony LED KDL-60EX700

thanks, yes it actually has an orizontal issue, when it was working unplugging one tcon ribbon to panel at a time, revealed a visible half for the half that is normally displayed well, and a blank image (almost black) for the half that normally displayed worse, but with only the half "good" connected i saw a pair of horizontal lines, one next to the other, that faded towards the good side, that make me think about an already said possible short on the output of the first side tab on the bad half (the line is near the top). I have reseated all connections except the tcon output connectors but it's surely not that. I have tested not all the caps on the panel's boards, on some i had no tension, but it's annoying that sometimes tester's probes doesn't conduct on smd terminals..
Now i have to find the new fault, already tested a bit the psu, no issues, i'm testing the tcon, not easy to connect alligator clips on that slim type boards.. see you later...

[budwich]

Re: Sony LED KDL-60EX700

:-( I am glad I did my side tab removal.... :-) I didn't want to chance going somewhere where I could get back easily. Good luck, I hope you find it as I hate to see an "almost saved" tv go in the recycle bin.

[budwich]

Re: Sony LED KDL-60EX700

another point.... on my sony effort, there were small metal plates running from the metal bezel to the emi isolating / grounding metal work near the tcon area. When you remove the metal bezel, some of those plates / "fingers" have the possibility of touching the edge boards. Have you checked to ensure that is NOT the case. Since you haven't post any pictures of the edge board area near the tcons and where you did your "surgery", can't say much else. Further, the one time that I tried to power up my set and those metal plates did touch the edge boards, the set would not power up. Once I checked and ensure things were not touching, the set powered up fine.

[Davi.p]

Re: Sony LED KDL-60EX700

I don't figure out which type of "fingers" are you talking of, but i have done my tests with metal bezel off, not any possibility of short to GND.

[budwich]

Re: Sony LED KDL-60EX700

the potential for the problem exists when the metal bezel is OFF. this metal "clip" that hold the bezel in place is what I am referring to.

[tom66]

Re: Sony LED KDL-60EX700

This looks like a side gate driver issue, where the gates of all the devices on one side are "off" and loading the panel. Removing the gate drivers from one side of the panel probably would fix the issue, but who knows how long the other side would last under higher load.

[budwich]

Re: Sony LED KDL-60EX700

This looks like a side gate driver issue, where the gates of all the devices on one side are "off" and loading the panel. Removing the gate drivers from one side of the panel probably would fix the issue, but who knows how long the other side would last under higher load.

that's the point where he "started" (ie. first picture)... but now the set can't power up at all. :-( Perhaps the loading from being "off" now that he played with the powering to them is so great that the system is shut down... maybe.

[Davi.p]

Re: Sony LED KDL-60EX700

No Budwich this is a led tv and has not that type of plates you referring, the panel's boards are on the same surface as the lcd panel matrix.
Tom yes i thought the fault is on maybe the first side driver on bottom (not top as i have said, tcon is on bottom), i don't think all side drivers are faulty, anyway them works in cascade so i guess is necessary to detach all of that side. Now i'm stuck on 5 led blinks meaning bad tcon, i haven't test it well, i can't find net shorts with dmm..

[Davi.p]

Re: Sony LED KDL-60EX700

I have few wish of repairing this tv, i was counting the money before fixing it after i have seen Budwich thread... anyway i'm now stuck in this situation: i have tried in any way to show up an image, first entering the service menu, then doing a service reset by cursor up+power key, this because in freakaftr8 thread he tell the story that Sonys need a reflash of the firmware to come back to life after a certain failure or detaching of the tcon. This sounds to me strange, since a protection mechanism doesn't write error flags in the firmware memory i think, but in eeprom instead, from here the try to reset. Status led blinks 5 times meaning bad tcon so i've done some tests with tcon pulled out and supplied by external supply, unfortuantely i have not any good instrument, only rubbish few dollars Chinese things, and rescued pieces from the garbage.. the first try was with insufficient powered PSUs, then i hooked an ATX PSU, the 12v is not precise, a little under, i have'nt any tension on the board, watched the datasheet of the multi pwm generator Thine THV3056 chip, i have short circuited the capacitor on the SCP pin (9) to bypass internal protection circuitry, in this way i have all typical tensions, the same as i have tested before the failure of tcon, apart from a doubt, i have a buck dc-dc that outputs 1,19V, that seems a bit strange to me as there are 4 (!) RAM chips and them usually works at 2,5v, i don't find any 2,5v.. so i have:
-5,5v; 1v; 1,19v; 1,8v; 3,3V; 12v(input); 15v; 34v.
The THine chip in this way warms up enough in few seconds but not to burn finger..
near the THine there is a power transistor with a big silicon pad over it, maybe at the
factory put it for error on it instead that on the Thine. The other ICs doesn't warm anything with SCP tied to GND so i can't suspect a short inside them.. I don't know what to do now..

[budwich]

Re: Sony LED KDL-60EX700

since you were "playing" in the 3.3 area with your "surgery", I would trace thru there. It would appear some form of "feed resistor" is no longer providing the right resistance (shorted / burned thru) due to an overload from the operation.

[Davi.p]

Re: Sony LED KDL-60EX700

I don't know which sense has this, OK freakaftr post says that some tcon needs panel connected, and i with my test i left it disconnected or with only the good half connected, but i think is not my case as when tv was working leaving one half disconnected showed me a half picture... so i guess my tcon is bad, i add a thing, i have searched the THine datasheet for a form of enable pin thinking an error flag on the tcon eeprom blocking it working but there is not...

PS: as always.. sorry for my english..

[Davi.p]

Re: Sony LED KDL-60EX700

UPDATE: i have took the bull from the horns and i have mounted the tcon in the tv, then with my little scissors shorting the SCP cap (SCP pin to GND) i have switched on the tv aaand... GUESS WHAT!!??? TV powers up and WITH A PERFECT IMAGE!!!!! Unbelievable... Now is running since 25 minutes with no issues.. i don't know what to think!! ...

Note1: from the RAM chips datasheets them works at 1,8v..
Note2: The short on the cap is enough to be keeped only for some instants at powerup.. tv doesn't power up without the short.

[freakaftr8]

Re: Sony LED KDL-60EX700

Can you post picture of this cap you shorted and position?

Good job!