Sony xbr-75x900f 6 red blink

[lotas]

Re: Sony xbr-75x900f 6 red blink

Not all Sony TVs will have backlighting without a connected panel (matrix).

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

I believe he means for you to test it with full access to backlights and without the screen/panel hooked up.

[EazyBone]

Re: Sony xbr-75x900f 6 red blink

I can easily tear the TV down again. Taking screen off is intimidating but not impossible.bhow am I supposed to test the LEDs all the way at the end? Flip it up and just plug it in again? Okay fair enough.

Diah, how do i test the LEds if it's all broken down. Or the ribbons?

[Diah]

Re: Sony xbr-75x900f 6 red blink

all possible... LED. wrong connection... bad ribbon...at the end TV will work and BL too with out screen.

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Yep, I agree Diah, need full access to everything.

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

May have gotten bad backlights, happens sometimes.

[Diah]

Re: Sony xbr-75x900f 6 red blink

85 size i take screen out alone... its not that complex if you have the correct suck cups

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Tear it back down, these tvs aren't that great anyway, picture quality is pretty shitty, if it were me, it has become a quest to figure out this hair pulling-out mystery OR you could just it.

[Diah]

Re: Sony xbr-75x900f 6 red blink

you were hurry to put back the screen back... because with out screen the tv and BL would work if every things good..
6 blink BL... you changed them but you didnt have the BL tested before the screen... so now its usless to find the issue... if one or ribbon LED damaged or lost connection will drive you to same issue... you were very hurry and this way cant solve TV repair....

for clean trouble shooting and repair my way will be start from zero.. screen out

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Saw a video of Nick struggling with an xbr mainboard, he had to change out the eMMC, another ic and the hdmi ic.

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

I absolutely hate these xbr's, still have my pos xbr that needs eMMC probably at least, maybe more.

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

These ones with 2 or 3 of every board are complicated, maybe check all the solder joints on the other powerboard, might have some bad ones.

[EazyBone]

Re: Sony xbr-75x900f 6 red blink

Then move right to the next board and try to prove it.

By prove it, do you mean force the on voltage for second PSU? I don't know how to do that to the second board. This is what I get on LED PSU output. And these numbers only change after 5 seconds by dropping to zero after TV detect error and want to flash red.

[EazyBone]

Re: Sony xbr-75x900f 6 red blink

if u disconect that cable
nothing happens ?
it should cycle through the leds doing a self check

Nothing happens that's different. TV power is hit, supplies ALL correct voltage on main power board. Bl-ERR goes to .6volts then within a couple seconds goes to 3.3 volts. I have tried disconnecting the main board from PSU and jumped BL on Pwr ON and TCON on. When doing this all correct volts happen, BL never turns on either and this cycle never changes at all. It does the exact same thing every time. Except for when I disconnect the TCON cables from MB to tcon and the MB to LED driver, then the TV turns "on" at least I have sound anyway. But still nothing anywhere changes.

The LED PSU never supplies the 35 or 70v (not sure cause never happened) to the LED driver board. It does get 35 v on some of the rails at startup and then BL err happens and the voltage drops. It's steady for a bit

[zomi]

Re: Sony xbr-75x900f 6 red blink

if u disconect that cable
nothing happens ?
it should cycle through the leds doing a self check

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Then move right to the next board and try to prove it.

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Here's Bobby doing a stand alone test, I have also done it on sonys, prove the powerboard then can eliminate it from being a suspect: https://www.youtube.com/watch?v=EC4d8sCeS4w

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

So where does it stand, have you done the powerboard stand alone test and did it pass?

[EazyBone]

Re: Sony xbr-75x900f 6 red blink

Check all the solder. Do you have voltage on your blue board now, going in and out?

It only gets 12v from LED driver. Nothing for voltage ever hits the fuse

Caps don't turn on, the IC chips start to get hot, and the cpu chips or whatever start to get hot also per thermal imaging and then just get that blinking code and they shut down

[nomoresonys]

Re: Sony xbr-75x900f 6 red blink

Check all the solder. Do you have voltage on your blue board now, going in and out?