Black screen on Sony 65x90ch (65x900h from Costco)

[Adam Russ]

Maybe youre getting terms mixed up, nowhere does it say you did a firmware update.

yeah I thought you were referring to the red light on the optical port, not the update. sorry

[nomoresonys]

Ok, so from what I gather the optical no longer is lit, does the indicator led on front of the tv light up at all when you try to turn the tv on or in standby?

[Adam Russ]

Nope. nothing anymore. Pretty sure the main board is a goner now. I must not have unplugged the bottom jumper to the power on when I hooked it back up. measurements around the emmc were lower than what I would have expected. so my first step now is to replace the main board before I can determine if anything additional is needed. I'm actually looking for the main board that went to the spare power supply. My records dont showing being sold but I can't find it now. 😕 Thanks to everyone for their help

I may just jump over to another tv i had sitting around for awhile and try to finally fix that. it's turns on and goes to the sony logo then turns off. Guessing that'll be a bad main board too

[nomoresonys]

Here's the thing, not sure how you did that first test with the jumpers but IF you had the cable from powerboard to motherboard UNPLUGGED as would be correct way, then you could not have damaged the mainboard at all, so were the boards connected during that jumper testing?

[Adam Russ]

Here's the thing, not sure how you did that first test with the jumpers but IF you had the cable from powerboard to motherboard UNPLUGGED as would be correct way, then you could not have damaged the mainboard at all, so were the boards connected during that jumper testing?

Main board power cable was disconnected. When I plugged the cable back in after pulling the jumper pins I'm wondering if I had only pulled 3 out fully and thr the power on one was still halfway in (it's on the bottom of the cable connector). That'd be my best guess. It might have overvolted the main. From what I've read when the main doesn't turn on its often the emmc chip

[nomoresonys]

Seems like the connector wouldn't even go back on easily, with a jumper left in.

[Adam Russ]

Seems like the connector wouldn't even go back on easily, with a jumper left in.

No, this was a rigged up jumper done with very thin wires. The wire mainly popped into thr very small space between the plastic clip and wire harness itself. Didn't use resistors either as I guess I should have. Hopefully I'll come across this other board.

[nomoresonys]

Go ahead and check F 1000 and F 1001 on the green LDA board, make sure they have continuity.

[Adam Russ]

Go ahead and check F 1000 and F 1001 on the green LDA board, make sure they have continuity.

Yeah both give me tone when tested

[EazyBone]

The main was likely the issue in the first place. Now it's dead, probably not because of a jumper but because it's shit EMMC. Who knows, we would of likely ended up at new main board anyway, fixed everything on Sony's lol.

[nomoresonys]

Well I don't recall or forgot so I'll throw the question to Diah or someone who has verified it, no guessing allowed, does the optical led light up when the eMMC is bad?

[Adam Russ]

The main was likely the issue in the first place. Now it's dead, probably not because of a jumper but because it's shit EMMC. Who knows, we would of likely ended up at new main board anyway, fixed everything on Sony's lol.

Yeah I did end up selling the old board. Kinds wish I didn't now. Looking for them, there are a couple of different main board numbers for thr 65x900h/65x90ch. Is there really a difference between 100689651 and 100689521? (A5031793A / A5014255A / A5014266A)

[EazyBone]

Type your board into shopjimmy.com they generally will tell you if there is substitutes or not.

[Adam Russ]

Type your board into shopjimmy.com they generally will tell you if there is substitutes or not.

Thanks. I did. They all list A5014266A whereas the existing one is A5031793A. I looked that up and it's a main board for a x91j or x91cj model. It's the next model year. This tv was purchased from liquidation.com/secondipity. Those people screw up so much.

[nomoresonys]

Those oughta work, they claim theyre new, if you want to make extra sure, just ask them if it will work with your panel number and give them the number or your sticker on the mainboard, NOT the silkscreen number: https://www.ebay.com/sch/i.html?_fro...4255A&_sacat=0

[Adam Russ]

Guess I'll be ordering the correct board and hope that fixes the issue. I'll have to check the tcon to make sure that's correct too.

Anyway, while you're here that other tv (65x90k) turn on, boots to the Google splash screen then turns off with 4 blinks. 4 blinks is most likely the backlights, right?

[nomoresonys]

Its a sony see? go ahead and put sony 4 blinks in the search above, you'll get a ton of threads on it.

[Adam Russ]

Those oughta work, they claim theyre new, if you want to make extra sure, just ask them if it will work with your panel number and give them the number or your sticker number on the mainboard, NOT the silkscreen number: https://www.ebay.com/sch/i.html?_fro...4255A&_sacat=0

thanks. yeah I saw those. those are the correct ones. I'm not using the sticker number because it's for a J model, not an H model. I'm surprised this tv was working with the wrong board installed. obviously it doesn't anymore, but for a short time it did. I can't believe they put the wrong board in and sold it.

[nomoresonys]

I can. Not long ago we spent a few hours trying to figure out why a vizio wouldn't work before we noticed the mainboard was completely wrong. It can be tricky, like when someone finds a tv or is given one without knowing if anything was done or tried. Some will buy a mainboard not knowing they have different ones for same models, it doesn't work so they get rid of tv, next guy assumes that the mainboard is original buys the same one and it just doesnt work.

[EazyBone]

thanks. yeah I saw those. those are the correct ones. I'm not using the sticker number because it's for a J model, not an H model. I'm surprised this tv was working with the wrong board installed. obviously it doesn't anymore, but for a short time it did. I can't believe they put the wrong board in and sold it.

I have a 850e Sony that has a board for a 850f. The TV turns on still and once it gets to YouTube to play or something it crashes. The original owner said he replaced the board and it worked for a while and the same thing happened again. I also had this exact thing with a different TV, and I ordered the correct board to fix it. So you might have a wrong board in there.

BUT like we learn here, I also have a 65 Samsung that when I lookup the board it's listed as a 55 inch tv and ONLY for the 55 also.

Hopefully the version you need is cheaper.