Strange, check the same on the second T-con. Measure the resistance on the inductors relative to ground, there should be no low or short resistance, except for the one that sits on the ground, to convert the negative voltage relative to ground (VGL).
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Sorry for the delay my friend!
It was next to impossible measuring the resistance of the smallest inductors because the leads are on the bottom and not on the side.
Some of the inductors had wandering resistance readings but they eventually settled on a number. I indicated that with a ⇅ symbol.
These readings were are basically the same whether I was testing the TCon on the TV or the one that I have off the TV.
Hope these are of help. To be honest I am not sure what they mean. I assume the wandering resistances are due to the nearby capacitors.
I used the copper mounting pads as my ground while measuring resistance.
Last edited by KYBOSH; 05-09-2025, 07:15 PM.Comment
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Funny story... i was looking over the old LVDS cable and noticed that the copper tracks at the end looked kind of dull.
Upon further inspection i found that it was covered with scotch tape.
Apparently the previous owner attempted to mask off 90% of the traces with tape in an attempt to get the TV working.
Would have never noticed this if not by chance.Comment
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quite irrelevant, but if you wish to play and experiment a bit i can suggest you a 5 min. test, locate the quartz near the cpu, solder a thin wire to short circuit it, connect everything and see if the screen auto test begins.. this could be the same as running the screen alone but here we can see 1. if screen works, 2. if half of tcon is on the MB.. kindly it will not work because of bad main board, but lets see..Last edited by Davi.p; 05-10-2025, 03:09 AM.Comment
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what had SoC to do with quartz Hz, at time each SoC had his own Hz tact.Comment
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No...this test is a step back when i was suggesting the screen self test, we are not sure about the bad tcon circuitry, with this test you can see if all part related to screen is ok, then the other part, the processor would be not ok.. disabliing the quartz is disabling the processor, so like detaching a main board from the screenComment
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Interesting...
Okay so be clear:
With the power off/unplugged, I want to create a short as illustrated in the picture.
Then power ON/plug in the TV and check for a self test pattern on the screen.
This scenario is the perfect reason why buying a TV160 4K-Vbyone & 2K-LVDS Screen Tester would be warranted! Its on my wish list!Last edited by KYBOSH; 05-10-2025, 02:54 PM.Comment
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the oscillator is not that, watch the processor, less than a inch down there is a grey 4 pin smaller one, don't; ask me the pinout, i do not know... the rest, thermal camera, special testers, im sure you don't last in the repair market witth these purchases..Comment
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I dont see anything like what you are describing but its probably all well and good.
This experiment is probably way over my head anyway!
Im going to go with the assumption that the Mainboard is the issue.
If I send it in for repair and its NOT the issue then at least for a $30 bench fee I will have confirmation that it works.
And that'll just leave the panel as the only possibility.
Im not in the repair market. I do this for a hobby and quite enjoy learning.
A tool like the TV160 is probably worth it bcos it will save someone days/weeks/months running around trying to figure these things out.
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Check these fuses just in case.Attached Filesif you find these attachements useful please consider making a small donation to the site
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My balls full with the elment here over, another reporting to the staff, i see people following him, keep him if you like, i seen him never fixing any product... anyway..
this is the item..
i don't kmow what do you mean for "hobby" , didn't you sell your works?Attached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by Davi.p; 05-10-2025, 11:53 PM.Comment
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It's actually a compliment to you Diah, the little guy is intimidated by your knowledge.Comment
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kybosh if you want i can suggest you things in private, not here in middle of --------.. people here are continuing to trespass the technical questions, especially by sunday when staff is on rest, typical cleverness of the useless unfair elements..Comment
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Davi.p - I agree with you the comments against your post are uncalled for so I will put in a ban for the user if it persists. However, you need to have a thicker skin as they remarks are quite tame. You can just ignore or say you dont respect them. At the end of the day we see you as a valuable contributor to the site so you should not let one person put you off from stating your opinion here. Zero tolerance to any bullying and admins are watching closelyUser submitted datasheet, schematic, boardview, service manual, firmware, bios, & software.Comment
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Hello everyone. Hope you are all well and in good spirits.
I wanted to update this thread with information that I have found since I last posted.
I found a good guy on ebay who agreed to test the mainboard for me for a bench fee.
He told me initially that these TVs are known for their panels dying but I wanted to be absolutely sure it was the panel and not anything else since we have been working on this thing for several months.
So he agreed to test it for me by putting it in another (similar but not same) TV model. Still dont know what model TV he used as I thought these mainboards were quite specific to the models they were made for.
Anyway the mainboard is fine and he was good enough to send pics as proof of life.
So Im at the end of my journey with this set.
I may never be good enough to do short detection and remediation on these LCD panels.
And even if I eventually could I certainly cant do anything like that now.
Thank you all for your help, input and expertise. I learned a lot and enjoyed the experience.
Hope this helps the next journeyman who has the same or similar symptoms.
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if you haven't tried another tcon, for a so large tv set i would try one..
This phantomatic "good guy" has really tested the main board? Where are the proofs?Last edited by Davi.p; 05-30-2025, 02:50 PM.Comment
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Thank you for the input Davi.
You may recall a few pages back I ordered a brand new T-Con board but there was no change.
The "good guy" sent me proof by way of a screenshot (not posted) of set's serial number located in the System Information page (and they match 👍).
No one wanted to fix this set more than I did but according to the Troubleshooting flow chart there is nothing left but the panel that could be at fault.
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sony bravia kdl-43w756c, no power, no sound
the charger brick has 19,2-19,3 vcc
changed the inverter board same result.
where should i start?
cheers -
Finally got my KD-50X690E up and running after replacing the power supply. Upon testing it I noticed the lack of sound from the speakers. At first I just ignored it thinking it was set to external speakers or some other kind of audio setting. However, after actually going into settings and looking around I see nothing of this sort. I looked it up on Google and apparently a lot of people have disappearing audio on a variety of Sony TVs 🙄. I'm going to see if a firmware or software update will resolve it, if available.
Has anyone else had this happen to their tv?
10-05-2024, 05:01 AM -
Hola a todos, necesito el esquema electronico de la placa 1-983-356-11 de un televisor sony bravia KD-65AF9.
Hello everyone, I need the electronic diagram for the 1-983-356-11 board of a Sony Bravia KD-65AF9 television. -
so i took out one of my spare gigabyte ep35-ds3r mobos from storage for use to do some cpu, ram and video card testing of stuff i bought from ebay and got for free from momaka. he bought 50 e8400 cpus for cheap from ebay some years ago and i decided to help him relieve him of some of his supply since he had waaaay too many!!
what did we say about hoarding too much stuff and depriving others of them?! *cough* socialism *cough* lol! 
i had to blow some dust off the board and heatsinks with the datavac as i didnt clean it up before putting it in storage. after finishing... -
Hi,
i want to repair a Sony KD-75XF9005 TV that initially only showed a grey picture.
Backlight seems to work, Sound (Setup menu after reset) works.
If i dissconnect the left FFC cable from TCON to panel i have half a screen on the right. If left cable is connected always only the grey screen.
Interchanged the cables, its always only the right side that is working. Always grey if left side is connected.
With my small knowledge i would think at least the cables are good.
Can this happen because of a bad tcon board?
Or is it always a bad/shorted...
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