Sony xbr-75x900f 6 red blink

[EazyBone]

Re: Sony xbr-75x900f 6 red blink

Man I amaze myself sometimes. That N fuse is good. The solder joints are all messed up and wasn't making good contact. It now reads fine. Blowing my mind here.

Uh diah, I don't have that anymore I tossed them since they were all messed up. None of the strips were different that I know of, they all looked exactly the same. They all also were tested and in-between connects too to see that they would light up. I have no idea how to test them from the ribbon cables driver side.

So the answer is I am unsure if they have it.

Here is only pic I have, would you be able to see the end of it from that pic?

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

LOL, thanks Lotus, I didn't see that label over there.

[lotas]

Re: Sony xbr-75x900f 6 red blink

"N" - fuse 2A

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Think it's got to be a fuse, they are designated F or N, only other N designation I know of is a resistor network component and that sure doesn't look like one of those.

[Diah]

Re: Sony xbr-75x900f 6 red blink

are you sure installed the replacement LED in correct order... if you look on the old one the end and abegin of the strips how many lines you have... 4 line mean they will work only in exact order... like Hisense... one group not only at same place one or 2 LED from other strips will light on too

so gow us please the strips end of the old one

[EazyBone]

Re: Sony xbr-75x900f 6 red blink

I think that N is a fuse, that would explain that board being dead.

If it is a fuse, it has no continuity. And could have just been the problem the whole time lol.

Also no matter what kind of connections etc I disconnect or any variation of cable disconnection the power board always throws the BL err 3.3 volts no matter what. I have even grounded it per the video and it doesn't have the error then, but it still doesn't work.

Diah I have tried all those cables and combinations of those cables and nothing changes. But like I said that N component which may be a fuse has no continuity.

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Backlights are new strips. New ones and old ones all tested fine with LED tester. When I tested them all with LED tester they were all working properly (but LED tester as people said may be unreliable) but they all lit up. Replaced them anyways just because.

And story, do you mean the lvds cable from main to LED driver? Because I've done that and nothing happens different. The LEDs never get power. No voltage ever turns on from the LED PSU ever.

Also Sony, I watched that video, looks like he is replacing the IC for the main board ? DPS board? I can't Google what that stands for but I found what appeared to be in that video and tested the caps and they were all good

Ok, looks like it's the sub powerboard.

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

I think that N is a fuse, that would explain that board being dead.

[EazyBone]

Re: Sony xbr-75x900f 6 red blink

Backlights are new strips. New ones and old ones all tested fine with LED tester. When I tested them all with LED tester they were all working properly (but LED tester as people said may be unreliable) but they all lit up. Replaced them anyways just because.

And story, do you mean the lvds cable from main to LED driver? Because I've done that and nothing happens different. The LEDs never get power. No voltage ever turns on from the LED PSU ever.

Also Sony, I watched that video, looks like he is replacing the IC for the main board ? DPS board? I can't Google what that stands for but I found what appeared to be in that video and tested the caps and they were all good

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

My bad, I thought you were highlighting the fuse, just now saw the N component.

[Storyteller12]

Re: Sony xbr-75x900f 6 red blink

Have you replaced the backlights with new strips?

If the screen is still out you can unplug the lvds cable going to the blue board and power up the tv. It should cycle the backlights in a test pattern. If backlights are all good they stay lit after the test. If bad they will cut off after test.

I usually record a video of the test pattern so I can watch and see what led is not working. Usually it’s only 1 led that causes the error.

Sonys are very finicky with the voltage and current the leds draw. I tried to temporarily wire 4 3v leds to test the one light out and still got the error untill I replaced with 1 12v led for Sony TVs

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

.

[EazyBone]

Re: Sony xbr-75x900f 6 red blink

Was my first thought but figured no he couldn't possibly be doing that.

I'm gonna watch that video right now.

Is this N thing a fuse also? Looks like one to me, no continuity on it.

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Will try this !

Lol Sony I posted earlier, was a bit tired and just switched red and black on meter ����

Diah, so they cables and LED are numbered from one starting at the bottom and go up to 12.
So essentially since the logo is middle screen I would essentially try disconnecting for example like 4-8 one at a time. Since they'd go on for the Sony logo. Gonna try it this way and every way.

Was my first thought but figured no he couldn't possibly be doing that.

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Here's Nick checking the dps board/backlight driver board on a sony, he has voltage going in but not coming out of board, so he knows it's that board that's faulty: https://www.youtube.com/watch?v=kaCl8J1pPd8

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Maybe test those little ceramic caps on your blue/ld/backlight driver board, check for shorts or very low ohms.

[EazyBone]

Re: Sony xbr-75x900f 6 red blink

Will try this !

Lol Sony I posted earlier, was a bit tired and just switched red and black on meter ����

Diah, so they cables and LED are numbered from one starting at the bottom and go up to 12.
So essentially since the logo is middle screen I would essentially try disconnecting for example like 4-8 one at a time. Since they'd go on for the Sony logo. Gonna try it this way and every way.

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Literally anything. Pb to main, backlight error which still exists. Second pb voltages every is negative lol

Test something else to make sure it's not your meter acting up, this is strange indeed.

[Diah]

Re: Sony xbr-75x900f 6 red blink

full LED / Local Dimming , working principle like Philips Ambilight but here BL , the MB firmware with X engine sock will defined the Picture color position to code like MAC. this mean.. at start up Sony Logo will be only middle position LED BL lit on.. this mean too the other LED ribbon cable can be disconnected.. because no signal of MAC code will go to them, try disconnect LEDs cable one by one to notice any change at start up

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Maybe your ld board is bad, those are usually not that much to buy.