Sony XBR-55X900E turns off randomly

[norayr]

Hi Experts,

I wonder who has experience with repairing Sony Bravia TVs?
I've got XBR-55X900E Android TV. It has latest firmware update. After a week or so, it started to turn itself off.
Before turning off, picture is standing still for few seconds, sound may go on, the after few seconds it turns off.
Sometimes it turns off then back on and is staying on SONY logo. Will not boot.
When it turns off, I can't turn it on right back. Need to do power reset and it may require up to 15 or more minutes I can turn it on.
And at one occasion when I was doing factory reset, background behind rings got greenish.
In service center they are telling that most probably it is a processor, but that is just a clear guess.
There is no error listed in TVs service menu, error log.

Please also see following videos illustrating the problem.
https://drive.google.com/open?id=1Sg...NWasr0zF3hxD0R
https://drive.google.com/open?id=17a...0DOV2AzeDhyzww

Want to say that TV may run fine for 2 days, and start turning off on third. Than after night, it will work OK again. So behavior seems completely random.

Can someone tell if this really sounds like a processor? Should I go blind and replace main board?

[CapLeaker]

Re: Sony XBR-55X900E turns off randomly

it could very well be a cold solder joint under the main IC on the main board. Seems like it is a new TV. Does it have any warranty left?

[norayr]

Re: Sony XBR-55X900E turns off randomly

it could very well be a cold solder joint under the main IC on the main board. Seems like it is a new TV. Does it have any warranty left?

It's a new TV. Bought in USA shipped to Armenia. So no warranty. So, do you mean the main chip, which is BGA packaged chip, needs to be removed and solder on main board again?

[Andrew F. Ali]

Re: Sony XBR-55X900E turns off randomly

You could remove the Main Bd. from the TV and heat the BGA chip for 10mins @ 350degrees using a hot air station. I've done this with several LG TVs but have not come across this issue with a SONY. It seems like you have a cold solder joint on the BGA chip, so I think using a Hot air station will solve your issue.

[norayr]

Re: Sony XBR-55X900E turns off randomly

You could remove the Main Bd. from the TV and heat the BGA chip for 10mins @ 350degrees using a hot air station. I've done this with several LG TVs but have not come across this issue with a SONY. It seems like you have a cold solder joint on the BGA chip, so I think using a Hot air station will solve your issue.

Thanks for the inputs. Can you send a link to video how this procedure is done? I don't have PCB engineering experience. Only chip design

[Andrew F. Ali]

Re: Sony XBR-55X900E turns off randomly

No I don't have a video to share. I am hoping another Member might be able to help.

[norayr]

Re: Sony XBR-55X900E turns off randomly

So, anyone who experienced such behavior on Sony Bravia before?
By the way, what were the symptoms for LG TVs for cold solder joint of main processor?

[nomoresonys]

Re: Sony XBR-55X900E turns off randomly

Could be a corrupted eprom.

[CapLeaker]

Re: Sony XBR-55X900E turns off randomly

Did you try a factory default yet?

[Andrew F. Ali]

Re: Sony XBR-55X900E turns off randomly

So, anyone who experienced such behavior on Sony Bravia before?
By the way, what were the symptoms for LG TVs for cold solder joint of main processor?

When the Power button was pressed the set would turn on and shut down Sometimes after a few seconds or after sometimes after a few minutes. Sometimes the stand-by light would just remain flashing in the normal manner to start-up but never started.

[nomoresonys]

Re: Sony XBR-55X900E turns off randomly

https://www.youtube.com/watch?v=RRoXRtzbezY video of eprom fix.

[norayr]

Re: Sony XBR-55X900E turns off randomly

Did you try a factory default yet?

Sure. Factory reset is not helping.

[CapLeaker]

Re: Sony XBR-55X900E turns off randomly

my bet is on the main IC or the eeprom. When the TV crashes next time take a can of air upside down or freeze spray and freeze the eeprom first and turn the TV on. Same thing with the main IC. Other than that, try reflowing the main IC.

[zomi]

Re: Sony XBR-55X900E turns off randomly

https://us.en.kb.sony.com/app/answers/detail/a_id/75705

reset tv

[norayr]

Re: Sony XBR-55X900E turns off randomly

https://us.en.kb.sony.com/app/answers/detail/a_id/75705

reset tv

Not helping. Did several times.

[norayr]

Re: Sony XBR-55X900E turns off randomly

I wonder what common issues you have faced with this model: XBR-55X900E?
What are typical failures on this model.

[nomoresonys]

Re: Sony XBR-55X900E turns off randomly

Maybe the new firmware is buggy, any way to get the old firmware back?

[Andrew F. Ali]

Re: Sony XBR-55X900E turns off randomly

Do you have a Hot Air Station?

[norayr]

Re: Sony XBR-55X900E turns off randomly

Do you have a Hot Air Station?

Unfortunately not.
I wonder when you blow hot air onto the chip, how other componemts are not getting loose and not detaching from the board?

[norayr]

Re: Sony XBR-55X900E turns off randomly

Maybe the new firmware is buggy, any way to get the old firmware back?

I don't know how to do the downgrade.