Sony XBR49X900E no picture

[nomoresonys]

Re: Sony XBR49X900E no picture

Thanks, will try it when I get these very little ic, cap and coil that I took off back in place.

[Nick's Tvs]

Re: Sony XBR49X900E no picture

Weird, renaming it should have worked.
One more thing you can try is with the flash drive plugged in, and power disconnected press and hold the power and volume down while holding it plug-in power. Don't let go until the update starts taking or the light turns green.
This will do both a hard reset and firmware update/pairing. Sometimes if a board gives me trouble this helps but now always.

[nomoresonys]

Re: Sony XBR49X900E no picture

I renamed it, tried it with power off then put in stick, tried with power on and put in stick while blinking, I think I downloaded firmware twice, guess I'll download the firmware with another browser, just can't figure this one out.

[nomoresonys]

Re: Sony XBR49X900E no picture

Thanks Nick's, I tried every which way to load the firmware, last time I plugged usb in, plugged tv on it went green/orange, usb stick lit up and blinked as they do, did it for about 20 seconds then stopped lighting up, then about 30 seconds later tv indicator light went red for a few seconds then yellow for a few then red, that's where it stayed.

[Nick's Tvs]

Re: Sony XBR49X900E no picture

Nomoresonys. In your case your mainboard is not paired, the orange and green blinking lights indicate you need to pair the mainboard.
Download the software from sony support onto a flash drive and follow the instructions in comment #2 of the thread.

As for everyone else, something else that you can do with these TV sets is disconnect the ribbons from the mainboard going to the T-con board. This should trigger the color pattern test. In doing so you can either confirm the mainboard is the issue or rule it out.
At least I am confident that is the case as this is something you can do with the 2015 models and I am pretty sure also works with the 2016 and 2017 as well.
If the color pattern test shows up then the T-con, panel, power, LEDs are fine. If the color pattern test doesn't show up at least you can rule out the mainboard as being the fault.

[nomoresonys]

Re: Sony XBR49X900E no picture

ok, my bad, I realize you were talking to unspun.

[nomoresonys]

Re: Sony XBR49X900E no picture

Thanks Dskall, I'll check them, I have to wait for solder paste, took off 2 ic's a cap and a coil, all real little shit, no fun working with this tiny crap.

[dskall]

Re: Sony XBR49X900E no picture

Need to check for other voltages. VONE, right side of board. VOFF top left. VDD 3.3v

[nomoresonys]

Re: Sony XBR49X900E no picture

Doubt very much if it will work but going to try reflowing the 8 memory chips near the sonyx1 and the x-reality pro chips, will take a least a week to get the needed equipment.

[nomoresonys]

Re: Sony XBR49X900E no picture

I think we are all having a very similar issue, mine is same except I have no backlight and the orange/green flashing indicator will start up every time I unplug and replug the tv to power, if leave tv in standby, that is not unplug from power then it will just turn on to dim white indicator still no picture or backlight, nobody has been able to figure it out from what I have seen, here's a question, do you have voltage on the bl-error pin? from all I have seen tried, it seems like a firmware issue because it looks like people have covered replacing all the hardware many times???

[Unspun01]

Re: Sony XBR49X900E no picture

Hi:

My camera and lighting is not suitable for a decent pic, so please see a high quality image of the TCON courtesy of shopjimmy.com

https://www.shopjimmy.com/sony-1-897...c-t-con-board/

[dskall]

Re: Sony XBR49X900E no picture

Can we get a good picture of t-con?

[Unspun01]

Re: Sony XBR49X900E no picture

Hi dwlee6vn and Nick's TV:

Are there any updates on this TV repair? I'm eager to know what the solution was?

I have a Sony XBR-65X900E with very similar problem, and I understand the 49", 55", 65", and 75" in the X900E series use same mainboard, and experience similar problems.

I got my 65" from someone in non-working condition. TV will turn on (power button, or remote), with backlights, and has a relaxing "spa" sound after a brief startup. Never does an image appear on screen.

The person who sold it to me tried replacing the TCON, and provided me with the original TCON, and the replacement TCON. Both TCON have same problem of backlights on with no display at all. No idea if TCON are working, or not.

Visible fuses on mainboard check out ok, and voltage is present on each fuse. TCON 12V fuse ok. 12V is traceable in multiple locations. AVDD on TCON is 0V at the ribbon connectors going to the panel.

I thought TCON was issue since missing AVDD, but since both TCON are missing AVDD, maybe the mainboard is not sending a signal to the TCON to turn on the RT6931 IC that looks like it controls these things?

Disconnecting ribbon cables form TCON to panel has no effect, not even a flicker.

Disconnecting ribbon cables from mainboard to TCON has no effect, not even a flicker.

I tried installing a software update via USB (plug in TV while holding power button and vol- button, until power LED turns green then release buttons) but there was no change. The LED on my USB stick flickers randomly every so often, but not consistently or for prolonged duration so I doubt the update is being installed.

What is the issue here? mainboard? or TCON?

In assuming problem is on TCON, I located two 6-pin ICs labelled ICA1 and ICB1 which both have 12V at pin 4, but not at pins5&6 which would be the outputs which feed the rest of their circuit paths.

I can get the screen to show some signs of life by jumping pin 4 to adjacent pin 5 with small screwdriver (thereby bridging 12V input to output), the screen lights up bright white (no image, just white). Therefore I doubt the screen is the issue, but rather the TCON, or more likely the mainboard.


Nick's TV: I'm really interested to know what is your experience with these mainboards? What is the culprit? There are some winbond SPI flash chips on mainboard. maybe these get corrupted?

I hope to hear from you or others with information on these SONY android TVs

[Nick's Tvs]

Re: Sony XBR49X900E no picture

To limtk55, well if that's the case, then all that needs to be done to prove that is to disconnect the ribbon that connects the LED driver to the main board. If the backlight, inverter or power board aren't working properly then of course no backlight. If they all are however, disconnecting the main board auto turns on the backlight like it does for some of the Samsung LED sets.
Just that small ribbon between the LED driver and main board, disconnect it, and plug in the TV. If the backlight comes up, then we can rule that out. If not, then we have a new diagnostic direction.*

[limtk55]

Re: Sony XBR49X900E no picture

This is not a TCON, mainboard or power supply issue.

It is an inverter and backlight issue. Try troubleshooting along that line and use back your original boards.

[dwlee6vn]

Re: Sony XBR49X900E no picture

Nick's TV - thanks for the offer. Have not 100% locked in travel route and timing yet, when we get it pinned down in next week or so, will let you know if we will for sure be coming though Tucson.

[Diah]

Re: Sony XBR49X900E no picture

Response to Diah,

This TV has an external power supply brick that supplies 19.5v.

so the issue 99.9% this external power supply don't have enough juice ( step up currents circuits fault) to support whole function.

[Nick's Tvs]

Re: Sony XBR49X900E no picture

Response to Diah,

This TV has an external power supply brick that supplies 19.5v.

dwlee6vn Yeah make sure to give us a call before coming through, we do appointment only to try and limit the amount of people in shop at the same time these days. How long are you stopping in Tucson for? These boards aren't easy fixes, we wouldn't be able to get it fixed same day, but ill see if I can maybe get a main board ready to go to trade you and bring in a spare T-con as well.

[dwlee6vn]

Re: Sony XBR49X900E no picture

Nick's TV - thanks for the feedback. The main board was sold as new and unused, not at take out, bought from Gearbrokers Kansas City. Maybe I can bring the whole tv and all the boards, in a few weeks I am driving through Tucson on the way to Phoenix. Can put in in the original box and stick it in the bay under the motor home.

Do remember that during the initial failure - the TV came on and worked normally for from up to 30 seconds or a minute until it went into the everthing works but no picture just dark grayish blue glow mode that it is now permanently in. I think it did that twice or three times.

[Diah]

Re: Sony XBR49X900E no picture

19.3v with tv on and Sony set up music playing. I ask again, what does a failed screen look like?

the one things i cant understand why you use external DC 19.5 V .while the Specifications AC 110-240 V, 50/60 Hz too. i think you don't have normal PSU.

this tell if yours external read 19.5V but its not sure this Voltage had enough Currents to handle the whole operation or it start normal but the currents drops down after few minutes. ( this happen same fault with Laptops the Output read 19V but with law currents thought not enough to recharge the batteries)

this could be the only answer to yours issue and the questions about remove one ribbon do the same behavior.