Sony 46X3000 errors

[OracsRevenge]

Hi folks,

I have a Sony 46x3000 that came to me with the led flashing 8 times, couldn't find anything obvious with the audio system so swapped the AE aboard.

The 8 flashes have now gone, the green led comes on and the Sony logo lights up on the frame, but no backlight.

Then after 30 seconds or so it switches back to flashing the led 5 times. I believe this indicates a TCON error according to the service manual.

Checked connectors and TCON fuses, all seem to be ok.

Any advice on where I should go next. I am tempted to now order a TCON, but a little worried that with two different errors on the TV I may be looking at a power board voltage issue, or maybe a voltage spike went through the set.

Any advice greatly appreciated.

Thanks

Pete

[budm]

Re: Sony 46X3000 errors

"Checked connectors and TCON fuses, all seem to be ok." So do you get VCC at fuses?

[OracsRevenge]

Re: Sony 46X3000 errors

Good point.

I checked the voltage at the main T-con fuse and it is going from 12v down to zero once every 2 seconds.

Traced this back to the Panel 12V on the UB1 board which is switched through by the Panel_on signal coming from the Main board micro-controller which is showing the same pattern. (voltages from the PSU are steady 12V)

I am not sure if this is telling me much, could just be that the micro turns on the T-con and if it doesn't get a correct response, it turns it off and tries again a second later. Altough this seems like a pretty drastic way of doing it.

Oddly, it seems in this service manual that the T-con isn't listed as it's deemed to be part of the panel and there is a UB1 Motion compensation board in-between the T-con and the main board.

There is no attempt at a back-light which may also be significant.

Thanks

Pete

[OracsRevenge]

Re: Sony 46X3000 errors

Uploading the Service Manual timed out on the board so I saved it to my server.

[budm]

Re: Sony 46X3000 errors

The main board is the one that sends out the PANEL_ON command.
How about other Voltages on the connectors? only the PANEL-ON command is fluctuating?
What is the flashing code now at this point?

[budm]

Re: Sony 46X3000 errors

Sch. i had to split them into smaller parts.

[OracsRevenge]

Re: Sony 46X3000 errors

Hi,

Just checked every voltage test point I could find and all seems as it should be.

The TV power light turns green for about 30 seconds then back to red and flashes 5 times indicating a T-con issue.

No backlight comes on during this time.

I put the old AE board back in and it went back to 8 flashes (audio error).

I did find another similar fluctuating signal on the PSU connectors on pins labelled DIMMER. Seems these are originally fed from the same Microcontroller on the main board.

Thanks

Pete

[budm]

Re: Sony 46X3000 errors

"The TV power light turns green for about 30 seconds then back to red and flashes 5 times indicating a T-con issue" So what DCV do you get at the T-CON board still fluctuating same for the Control signal for the T-CON panel-power?
We still need good pictures of the whole backside of the TV so we can see all the boards.
"Just checked every voltage test point I could find and all seems as it should be." At which connectors and at which boards? And how about the signal pins what DCV do you get when TV is OFF and when TV power switch is activated and then after it goes into shutdown mode?

3-8-5.
When the TV Set has a T-Con error please check the following:-1.Check the BE micro pin 128 on the FB2 board.2.Replace the panel module.
The schematic is not easy to read due to pages are spitted into many pages.
The diagram is really confusing, the T-CON 12V is connected UNREG 7V?

[OracsRevenge]

Re: Sony 46X3000 errors

Hi,

The DCV at the T-con board is fluctuating with the Power on Signal

The connectors I checked were mostly on the PSU board as I it's screen printed with the voltages. so below is when the TV is powered up.

All 12V lines are 12.28 and remain that way on standby
All 6V lines are 6.13V and remain that way on standby
Audio_Vcc is 13.77
DIMMER changes from 3.2v to 0.02v every 2 seconds
Balancer_err = 0v
Inverter_err = 0v
Back_light = 0v
AC_rly = 4.83v
PFC_DET = 2.94V
PS_Err = 0v
Stby5v = 4.86v (same when on standby)

There are brown and white wires that head to the inverters that are at 594VAC

As I was testing these voltages (probably around the inverter power area, a curious tings happened. My daughter said the TV started glowing. Sure enough, the backlight was on, which it had never been before. Maybe I disturbed a cable or connector somewhere.

When the TV is powered on now, after 3 seconds the backlight comes on. I used the remote to ramp up the volume and I could hear static from the speakers. I then connected a HDMI source to the TV and once I figured out how to change the source blindly, I managed to get audio output from the speakers.

However, still no picture or OSD on the screen.

It did revert to the 5 flashes once again after that, but cleared again after a power reset.

I think at this point I need to try to figure out which board to replace next as they are not that expensive on Ebay.

I am leaning towards the FB2 or UB1 boards at the moment. If the TCON needs replacing then that will be a challenge as it seems to be part of the panel on this model. (plus no mention of it in the Service Manual, only to replace the panel module for a TCON error)

Flow chart in the manual says "Check
LVDS harness
(FB2/UB1 and Panel)
FB2 / UB1 board
Panel Module"

Is there an easy way to tell if the FB2 (main board) is outputting a signal to the UB1 motion compensation board? or the UB1 board to the TCON? I have a DVM, but my haven't turned on my oscilloscope for a few years and seems to be a bit temperamental.

Moving the LVDS cable around doesn't seem to change anything.

Photo attached.

Thanks

Pete

[budm]

Re: Sony 46X3000 errors

The T-CON board is under that metal shield, the connector on the bottom of the board is connected to the FRC (Frame Rate Conversion) board, then the connector of the bottom of the FRC board is connected to the main board.
So you you remove that shield to get to the T-CON board fuse? T-CON bd is replaceable.
https://flattvparts.co.uk/lcd-tv-par...ny/kdl-46x3000

I still do not understand why the Power on command is fluctuating but the 12v, 6v, pfc det are steady.

[OracsRevenge]

Re: Sony 46X3000 errors

Yes, I had a go at removing the Tcon board a few days ago but it's pinned in by the metal bracket that seems to be supporting the panel, will have to take a lot off to get to it. Luckily the TCON power fuse was on the lower edge of the board that is accessible.

The linked diagram shows how the panel_on signal switches through the main 12v through to the Panel 12v which is the power for the T-con board. This is why the fluctuating signal is turning the Tcon on and off.


I left the TV off for a while, came back in and it's back to 5 flashes

http://www.ukrobotgroup.com/Downloads/tconpower.jpg

(attachment uploader not working for me tonight)

Thanks