I'm stuck on this tv. It has sound, and has backlight glow, but no picture. I've tried new power board, and new main board, but no change. Tried a new t con but still no change. I've updated the firmware after new parts with no change. Is it likely the panel is just dead of would it be lvds cables. I did take some shorter ones I had on hand and connected those between the main and t con just to see if I'd get a picture but no luck. I'm not sure what else there is to blame. Do screens just go out completely but remain with a backlight glow? The screen has been removed and used a backlight tester on all strips. All tested good so backlight isn't the problem. No blinking codes. Any suggestions?
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Black screen on Sony 65x900h
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Just be be fair. I've confirmed the power supply is good already with proper voltages. Same readings and results with a backup known working power supply. This is a new (as in different) main board from the one it had when it went black. I have confirmed it is the correct model for the tv. This is also a replacement t con as that was the last board that hadn't been swapped. In the past I even swapped out the LDA board but no change. But seeing as this is a new power supply, new main, and new t con, and the firmware update has been put the root of a USB and put into the tv. I know it reads the usb because the light on it flashes but it doesn't enter into a turn off cycle no matter how long I wait. Either it's not applying the update correctly or there has to be a bad cable. Unless the screen has totally died, which I guess is possible, but less likely.
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I didn't ask to confirm the power board is working. This is too test screen.
You need to disconnect the connector from the PSU to the main board at the main board. Then you need to disconnect the LVDS cable from the t-con side to the motherboard no cable should be connected to the t-con except for the PSU. Then you need to jumper the PS- on the standby the t-con on and the BL-on. In doing so you should have a screen pattern show up on the screen with red green and blue images. Let us know what happens.
Also to update the TV you may have the correct instructions but if you don't there is a link.
https://tvpartstoday.com/pages/sony-...FpiVJqaspncoXZ
It's also important to note that the USB drive needs to be two gigabyte or 4 GB fat 32. Even if you change a different size USB to fat32 it's not going to work. At least I've tried and it doesn't so yeah.
Last edited by EazyBone; 02-01-2025, 11:54 PM.
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Originally posted by EazyBone View PostI didn't ask to confirm the power board is working. This is too test screen.
You need to disconnect the connector from the PSU to the main board at the main board. Then you need to disconnect the LVDS cable from the t-con side to the motherboard no cable should be connected to the t-con except for the PSU. Then you need to jumper the PS- on the standby the t-con on and the BL-on. In doing so you should have a screen pattern show up on the screen with red green and blue images. Let us know what happens.
Also to update the TV you may have the correct instructions but if you don't there is a link.
https://tvpartstoday.com/pages/sony-...FpiVJqaspncoXZ
It's also important to note that the USB drive needs to be two gigabyte or 4 GB fat 32. Even if you change a different size USB to fat32 it's not going to work. At least I've tried and it doesn't so yeah.
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Originally posted by EazyBone View PostI didn't ask to confirm the power board is working. This is too test screen.
You need to disconnect the connector from the PSU to the main board at the main board. Then you need to disconnect the LVDS cable from the t-con side to the motherboard no cable should be connected to the t-con except for the PSU. Then you need to jumper the PS- on the standby the t-con on and the BL-on. In doing so you should have a screen pattern show up on the screen with red green and blue images. Let us know what happens.
Also to update the TV you may have the correct instructions but if you don't there is a link.
https://tvpartstoday.com/pages/sony-...FpiVJqaspncoXZ
It's also important to note that the USB drive needs to be two gigabyte or 4 GB fat 32. Even if you change a different size USB to fat32 it's not going to work. At least I've tried and it doesn't so yeah.
Alright did the jumper procedure as you instructed but no response. I known if I pull the BL on, PWR on, or STBY the power supply clicks on and clicks again if reconnected, but when it comes to the tcon on, there is no change whether the jumper is connected or not. or not. And it doesn't power on or show backlights when you try to turn the tv on with all 4 junpers connected.
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Originally posted by Diah View Postits mistake to play with PSu and jumpers when you have sound and BL. but screen remain black..
any damage on scgreen glass at any courner will kill the VCC..
yours way to take bezel out and ispect the screen glass.... and to play with U ribbon to disconnect one side each time
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Replacement mainboard could be bad. The tv is 4 years or so old, that's about the time that the eMMC dies and needs replaced. Maybe check some fuses there's one on the LD board, some sonys have a few little fuses on the mainboard.Last edited by nomoresonys; 02-02-2025, 05:19 PM.
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Sonys are SO hard to diagnose, spent time looking at repair forums with just hundreds of people having the same problems that they can not figure out. Anyone know why they are like this or have any theories? Thinking it must be design flaw/s. I know a lot of times the issue is a dead eMMC.Last edited by nomoresonys; 02-02-2025, 05:38 PM.
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Originally posted by nomoresonys View PostWith everything hooked up as normal, is the light at the optical port of mainboard lit?
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I can't find the 4gb thumbdrive so I'm at a standstill. The hard drive partitioned didn't work. the tv reads it but doesn't apply the update correctly because I end up with about 10 or so folders that you'd typically see on an android phone (Alarm, DCIM, Music, etc) but they are all empty folders.
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