Sony OLED XR-77A80J - 5 Flashes But Turn On After Hard Reset

[Diah]

I did leave it on for a couple of minutes to make sure that the light remained on, although it wasn’t as long as 5 minutes. I pressed the power button after a couple of minutes because even though the optic light was on, I hadn’t heard the relay click on the power supply. This suggested to me that the TV was probably in standby mode. (I still believe this to be true.)

I’ll do the same test again tonight, but try harder to get the TV in a mode where the relay is engaged. If successful (and the optic light stays on) then I’ll attach the EVDD as you suggested.

LOL... Man... don't give any attention to relay click... this is not our sign... the sign are optic out port if it lit on mean the relay did the job and the TV running with out EVDD panel... wait 5 minute and plug the one evdd... give attention to the screen.

[Davi.p]

Hi odie.. my bet (since the first post) is that you 90-95% repair your tv by buying a repl. tcon, with 2 requisite: card must be returnable if no go, card must be declared for sure coming by cracked panel
but first 2 minutes test before buy : put card in freezer inside bag, for at least an hour, pull it outside and mount averything as normal, tcon still frozen, test the tv, if it runs much more long then sureness is 100%

[Diah]

good test suggested,, don't forget to add 500 ml 3.8% fat milk + 2 tea spoon sugar to the t-con bag...also in case you like Vanilla taste you can add too.

[Davi.p]

Likewise, the same freeze test could be made on main board, separately..

[odie34]

Diah The optic light was on for about 30 minutes and I plugged in the middle EVDD cable. Nothing happened. (No picture and the optic light stayed on.) I considered plugging in the other EVDD cable but thought I'd wait for suggestions first.

[odie34]

Davi.p Thanks for the suggestion. I'm thinking that the TCON is the most likely thing as well, but both Diah and lotas indicated that TCON boards are paired to the panels on OLEDs and that you shouldn't just swap the boards. I interpreted their comments as meaning that there's configuration data in the TCON that should be transferred first. Do you disagree?

[Diah]

Diah The optic light was on for about 30 minutes and I plugged in the middle EVDD cable. Nothing happened. (No picture and the optic light stayed on.) I considered plugging in the other EVDD cable but thought I'd wait for suggestions first.

strange... did u check if there 21v on evdd before u plug it back while the optic on.... and are there 12v on t-con..? u can try the other one if there the 21v

[odie34]

I think I was right about standby. The optic light is on but there's no power on EVDD. At that point pressing power causes the white power led to turn on and the relay to click, but then the optic light turns out and the red power LED starts flashing 4 times. I don't think the TV likes having no power to the EVDD sockets.

[Diah]

I think I was right about standby. The optic light is on but there's no power on EVDD. At that point pressing power causes the white power led to turn on and the relay to click, but then the optic light turns out and the red power LED starts flashing 4 times. I don't think the TV likes having no power to the EVDD sockets.

how about the t-con 12v.... also no there when optic on??

[Davi.p]

Yes odie, i disagree, i'm not sure, i'm studying oled tv with no economical effort, them are too expensive, only hobbie interest, my guess is that those bought tcon that shows graphic defects are tcon with broken files on them and must be returned, people sell them thinking their tv are failing at dot matrix, tcon must be took from guaranted cracked panel
...in the other thread of "riparo" maybe we are finding a common ugly insect of bad condenser, the known 0,5cent bastard that turns big beasts into trash ware...

[EazyBone]

good test suggested,, don't forget to add 500 ml 3.8% fat milk + 2 tea spoon sugar to the t-con bag...also in case you like Vanilla taste you can add too.

I tried this and it worked great!

Just buy a TCON already lol. you got analysis paralysis.

[odie34]

I want to let you all know that I’m going to be away for a week, so I won’t be able to continue looking at this until next weekend. In the meantime I can confirm that there’s no TCON_12V either when the optic light is on in the test I was doing. I’m inclined to try a TCON replacement when I get home. Maybe Diah can explain his concerns about that in the meantime.

[odie34]

Hi All! I've returned and am getting back to this. I think my next step is to get a replacement TCON, but both Diah and lotas indicated that I couldn't just swap in a replacement board. (Perhaps there's some configuration data in the board itself that needs to be transferred.) Can someone with knowledge of this let me know what (if anything) I would need to do this properly? Also, does anyone know where I can get a service manual for this so I'm not going into it completely blind? Thanks!

[odie34]

Okay... Next update: I thought I'd look into Diah 's suggestion of pulling the error detection pin low, but now I's seeing that while the TV continues to do 5 flashes, it's intermittently giving 2 flashes. I assume that that suggests an issue with the power board. It doesn't seem to be related to TCON in any way. Should I be looking closer at the power board?

[Diah]

Okay... Next update: I thought I'd look into Diah 's suggestion of pulling the error detection pin low, but now I's seeing that while the TV continues to do 5 flashes, it's intermittently giving 2 flashes. I assume that that suggests an issue with the power board. It doesn't seem to be related to TCON in any way. Should I be looking closer at the power board?

don't play with PSU... now yours T-CON suicide after forcing it to remain on by pulling the error detection, Time now for T CON replacement
good luck

[odie34]

don't play with PSU... now yours T-CON suicide after forcing it to remain on by pulling the error detection, Time now for T CON replacement
good luck

But what about the 2 flashes? And i can still get the TV to turn on… I just get the 2 flashes occasionally.

[EazyBone]

But what about the 2 flashes? And i can still get the TV to turn on… I just get the 2 flashes occasionally.

Everyone diagnosed the s*** out of this TV and you're still messing around with other crap five blinks is t-con or panel we have figured out it's your t-con most likely stop messing around and buy it this is pointless for you to keep trying random stuff

[Davi.p]

Hi, so at this point that you'll probably buy a tcon, why don't you try a light reflow of the bga chips on tcon? Well, actually better to start with a certain heating but not real reflow, you can go at steps.. and try it after eàch step.. important! After each step board must be fully cooled before try, don't ask me why, please..

[odie34]

Everyone diagnosed the s*** out of this TV and you're still messing around with other crap five blinks is t-con or panel we have figured out it's your t-con most likely stop messing around and buy it this is pointless for you to keep trying random stuff

The reason why I'm so timid is that knowledgeable folks have indicated that there's panel-specific configuration data in the eMMC, so replacing the T-Con may cause other problems. (I've seen pics of OLEDs that were "successfully" repaired by replacing the T-Cons, but the screens look terrible, and people are asking how to transfer the configuration data.) I've also read that you may need to update the firmware to marry the T-Con with the main board and/or the panel. So I don't know if I'd be able to go back to the old T-Con so easily if it turns out that the problem is elsewhere. (At that point the main board would have the current firmware and wouldn't be able to re-marry the old T-Con.)

I may be misinterpreting things here, but this is the reason for my hesitation. I was all set with moving forward on replacing the T-Con, but as I understand it, 2 flashes can only mean an issue with the power board (or possibly the main board). This made me wonder about the first tests I did where the screen didn't light up when going directly from the T-Con to the panel. I'm wondering if the problem is that the power supply hasn't been supplying the required current. (The manual indicates that 5 flashes is most likely T-Con, but it also lists the power board as a possible cause.)

Now before you get completely frustrated with me, let me say that I've just ordered both a power board AND a T-Con. I will first replace the power board and see if that fixes anything. If not then I'll replace the T-Con (and probably have a number of additional questions).

[odie34]

Hi, so at this point that you'll probably buy a tcon, why don't you try a light reflow of the bga chips on tcon? Well, actually better to start with a certain heating but not real reflow, you can go at steps.. and try it after eàch step.. important! After each step board must be fully cooled before try, don't ask me why, please..

I don't have a reflow station, but am open to trying an alternative method before I install the new T-Con (if the new power board doesn't help).