Sony XR-55A80J OLED TV 5 blinks - Troubleshooting steps

[jason123]

Hi there,
I see a couple of posts related to the troubleshooting of similar TV. The one I have is acting slightly differently and I'd love your help.

So it has the 5 blinks. Previous owner got a TCON, no luck. Got a new Main board (though he didn't do the USB firmware update), again, no improvements.

I see 2 posts that are relevant:
https://www.badcaps.net/forum/troubl...j-oled-5-blink
https://www.badcaps.net/forum/troubl...grade-possible

So I disconnected the Main board from the circuit. Added a jumper between PWR_ON, TCON_12_ON and EVDD_ON and STBY

Now all I get on the screen is backlight (screen lit up) but no colors on the screen.
The EVDD on the TCON is 18.8 V
The TCON_12 is 12.76 V
Note that with TCON disconnected, the above voltages don't change much.

I saw in other posts that EVDD should be higher? but I don't know maybe the 55" (Smaller) can live with lower voltage?

Any suggestions on how to proceed?
Thank you

[Diah]

Hi there,
I see a couple of posts related to the troubleshooting of similar TV. The one I have is acting slightly differently and I'd love your help.

So it has the 5 blinks. Previous owner got a TCON, no luck. Got a new Main board (though he didn't do the USB firmware update), again, no improvements.

I see 2 posts that are relevant:
https://www.badcaps.net/forum/troubl...j-oled-5-blink
https://www.badcaps.net/forum/troubl...grade-possible

So I disconnected the Main board from the circuit. Added a jumper between PWR_ON, TCON_12_ON and EVDD_ON and STBY

Now all I get on the screen is backlight (screen lit up) but no colors on the screen.
The EVDD on the TCON is 18.8 V
The TCON_12 is 12.76 V
Note that with TCON disconnected, the above voltages don't change much.

I saw in other posts that EVDD should be higher? but I don't know maybe the 55" (Smaller) can live with lower voltage?

Any suggestions on how to proceed?
Thank you

OLED had no BL , put the the original T-CON and do the test again, post photo of your screen

[jason123]

Hi,
This is the original TCON and Main board, I'm told. He bought them and when they didn't fix the TV he returned them.
Yes, I'm aware there is no BL in the light-bulb sense, but I wasn't sure how to describe. I can provide photo shortly, but there is no hint of color or any activity other than you can tell it's on

[jason123]

Here is a photo of the TV with it on - just brighter screen, no color

[lotas]

You forgot to connect one LVDS cable. We tried replacing these two LVDS cables with others; they're a common problem with Sony.

[jason123]

You forgot to connect one LVDS cable. We tried replacing these two LVDS cables with others; they're a common problem with Sony.

Sorry, just so I understand... I need to connect the upper LVDS between the main board and the TCON or connect both LVDS cables? Even with the main board not powered?

So to speed things up... I tried with one lvds cables connected at a time then with both and no change. Nothing is coming on the screen other than being lit up

[Diah]

connecting LVDS not required , because the MB already disconnected from PSU.
yours T-CON didnt start to make the Pattern , you need OLED Tester.. which will feed 3.3V via the lower 51Pins LVDS an T-CON

one things more... if you remove the jumpers. and connect MB to PSU. just unplug the lower 51Pin LVDS from MB Side, turn on... did yours set come on and the Optic Port lit red ?

[Diah]

if the test above you have Optic port lit red and remain the set OB.( screen stay black) do the second steps
connect the LVDS 51 OIN back, disconnect only the EVDD socket ( black) from T-CON side.. turn on if the OPTIC lit red and set remain ON, then plug the TV from Wall, press power on set pull it down if you have Joystick,, keep pressing then plug the set back to wall... release the pressing only after the front LED change from White to green... leave the set in this state it will hard reset... could reboot 2-3 time... give time for it till you start to hear the Melody of first install and remain on for about 10 minute or more.... at this state while its on and you hear the Melody plug back the EVDD socket at its place the screen will come on... give attention on it or record it to sea if it clear or not

[jason123]

connecting LVDS not required , because the MB already disconnected from PSU.
yours T-CON didnt start to make the Pattern , you need OLED Tester.. which will feed 3.3V via the lower 51Pins LVDS an T-CON

one things more... if you remove the jumpers. and connect MB to PSU. just unplug the lower 51Pin LVDS from MB Side, turn on... did yours set come on and the Optic Port lit red ?

Ok, when I remove all jumpers and disconnect the 51pin LVDS, the Optic port is lit red and remains red

I should buy a OLED tester? any recommendation? this TV is 2022 manufacture date. Any specific tester I need?

[jason123]

if the test above you have Optic port lit red and remain the set OB.( screen stay black) do the second steps
connect the LVDS 51 OIN back, disconnect only the EVDD socket ( black) from T-CON side.. turn on if the OPTIC lit red and set remain ON, then plug the TV from Wall, press power on set pull it down if you have Joystick,, keep pressing then plug the set back to wall... release the pressing only after the front LED change from White to green... leave the set in this state it will hard reset... could reboot 2-3 time... give time for it till you start to hear the Melody of first install and remain on for about 10 minute or more.... at this state while its on and you hear the Melody plug back the EVDD socket at its place the screen will come on... give attention on it or record it to sea if it clear or not

So with everything connected normally, except for EVDD (Black) connector disconnected from TCON, the TV starts (No White front LED) rather goes directly to 5 Red Blinks.
I proceeded to second step just to try, however the TV never goes into "Green" Color. I pressed the power button close to minutes, but no luck. No Melody either.

[Diah]

so yours MB OK, we have SOS signal coming from T-CON because of T-CON or Panel.. plesae upload close photo of yours T-CON

[jason123]

Here you go

[Diah]

ok thx, this version of T-CON are stable.. so the issue i guess 99.9% at the Panel EVSS,
disconnect all 4 Ribbon cable Just from Panel buffer boards side.. give attention on the first left you will have 2 caps title bigger than other , one of them could be have short or leak... also check all other three same size of the Caps.. if one shorted , you can compare over all 4 places

[jason123]

Ok... what's the best way to test these? I have and ESR meter and I have a capacitance meter. Test in-circuit or remove them test?

Would putting the jumpers back in and check for heat be best?

[Diah]

test and compare them with resistance low Ohm bad