Sony XBR-75X940E intermittent 6 blinks error code

[lotas]

why don't to try search for a led driver board by second hand? Which is its code? Is it so uncheap?

1-897-091-11
https://www.ebay.com/itm/236203861487

[GoodCapDude]

1-897-091-11
https://www.ebay.com/itm/236203861487

Interesting! Maybe I'll try that if what I'm trying now does not work out... Would it work with a European voltage? Thanks. I'm new to this and wasn't too sure and where to look for that.

[tiki66]

Hi nomoresonys, thank you for the interest. I was planning to give an update once the story is over but it's still going on!

So I went to a professional repair shop which is going to test the three boards (forming the power supply) one capacitor and other relevant items at a time (he told me he would desolder them and resolder them). Before that, I tried to ground the BL_ERR and the TV started to blink red four times instead of six times. I was not too sure what to make of that. I hope I did not damage the connector.

Where and how did you ground BL_ERR?

Also, I've never seen a bad LD board on Sony...

[Davi.p]

OK so no BGA IC, then what could go bad temporarily are maybe those 4 electrolytics, but them are top brand, if i would be in you i would buy a very cheap chinese market multi tester with capacimeter/esr meter, and test them all, or give the board to the shop, the replacement of them is not so easy as the ground planes are big, since the set can fail to start so the problem is at cold, like all the bad electrolytics.. the metal cover could crate too heat, especially if the beast was hooked to the wall..

[Davi.p]

Note: The heat is what usually kills the electrolytics.. need also to check their solder job for factory bad job

[zomi]

Theres a couple of bl err lines on this looking at the schematic ?

https://www.youtube.com/watch?v=31V_s17USnU

its got like 500 plus leds..

[GoodCapDude]

Where and how did you ground BL_ERR?

Also, I've never seen a bad LD board on Sony...

I have removed the 3rd pin on the connector between the G75 and the main board on the G75 side. I attached it to a screw hole.

Not sure which one is the LD Board.

Thanks!

[GoodCapDude]

OK so no BGA IC, then what could go bad temporarily are maybe those 4 electrolytics, but them are top brand, if i would be in you i would buy a very cheap chinese market multi tester with capacimeter/esr meter, and test them all, or give the board to the shop, the replacement of them is not so easy as the ground planes are big, since the set can fail to start so the problem is at cold, like all the bad electrolytics.. the metal cover could crate too heat, especially if the beast was hooked to the wall..

I gave the three boards to a shop that is supposed to test them for 30€. Then they are going to give me a price for a possible repair.

The problem is not only "at cold". I mean if it has started, I can keep it working for 30 minutes, turn it off and then on and get the 6 red blinks. Not sure if that counts as "cold".

It has been hooked to a wall indeed. Thanks.

[GoodCapDude]

Theres a couple of bl err lines on this looking at the schematic ?

https://www.youtube.com/watch?v=31V_s17USnU

its got like 500 plus leds..

Yes there are multiple BL_ERR connectors. I Chose the one between the power supply boards and the bkmp board like I saw a guy doing on a youtube.

There are 576 leds! It was good for 2017.

[Davi.p]

OK so no electrolytics are the culprit, apart their solderings.. can you check this on the led/LD board?

[tiki66]

I have removed the 3rd pin on the connector between the G75 and the main board on the G75 side. I attached it to a screw hole.

Not sure which one is the LD Board.

Thanks!

You can't do it like that, you have to follow my instructions to turn off BL_ERR

I gave the three boards to a shop that is supposed to test them for 30€. Then they are going to give me a price for a possible repair.

They can test shit without a tv.

[GoodCapDude]

You can't do it like that, you have to follow my instructions to turn off BL_ERR


They can test shit without a tv.

Ok. When you told me I had not decided to do it and then I forgot about your message. I'll try that then. The result I had with what I did was 4 blinks error. At this point, I can't test anything as the boards are at the shop. I think the idea was that they would check soldering and the relevant components but Davi.p seems to think that since I can get the failure with a "warm circuit", I can rule out the defective component part.

I think I'm gonna test it with the parts coming back from the shop. From what you guys are saying, it is unlikely that there will be an improvement. Then I'll try to ground the other BL_ERR like tiki66 is saying and I'll throw the towel if it does not work.

Someone I know had this TV, bought a bravia 9 because of the error and I said I would have a go at fixing it although I am not sure of what to do with it as I'm more of a projector guy. I thought it was still a nice piece of equipment and that maybe I could give it to someone but it is really a pain to move from one place to another! I think that when I'm done with the shop and the BL_ERR, I would have gone as far as I reasonably could. Trying to buy boards seems to be a little too much. It can be expensive (the shipping can be $60!) and there is no guarantee of success. Thanks for your help everybody. I will keep you posted on what happens.

[Davi.p]

They can test shit without a tv.

What do you mean? All three boards can be connected toghether and turned fully on and tested with test loads..

OP: have you checked the el.caps. soldering on the led board? It's 30 seconds test..

so to repeat one second, TV set turns on with blinking error both when at cold and at warm?

It's a suspicious situation for a real electric fault, i would surely try to update the software.. as soon as possible..
otherwise the second suspicion is the main processor with some bad soldering.. i hope you would sell or give for free the set
and not trash it, it's a sin..

[tiki66]

What do you mean? All three boards can be connected toghether and turned fully on and tested with test loads..
.

They can't. Where is the backlight? Even one wonky LED could trigger backlight error.

[Davi.p]

But no.. i mean, the direct feed for the led is the led driver board, the function of the "brown boards" are only to feed low volts, to the Main-tcon-led board, them are completely testable...