Sony XBR-75X800G - Android start up only and dark blue screen

[nomoresonys]

Thanks for direction, I'll check on it, was just a quick question, don't want to get the thread off course, maybe send me a pm or respond on my sony thread, you are the Master, Thanks.

[NolesFan]

Thanks guys for the info, Ill try to look into it tonight if I can but I have an odd question. I noticed yesterday when trying to do some testing, I was getting odd readings. I checked voltage at power cable where it meets PSB, and it read just 94v and this was on 2 different MMs to be sure. I then checked my outlet ( thinking maybe I had a bad common ) and it tested out at 120. Is that reading of 94 normal at the PSB? Im guessing no, because its just a cord and shouldn't have that sort of voltage drop thru the OEM cord.

Also this TV is new to me, so I'm only guessing on the Android start up sound. I hadn't realized there were 2 different sounds. Ill try to get a recording tonight if that will help with further diag.

[NolesFan]

its much likely Main Boards... but because you have dark blue picture, you need to testing the screen as standalone, if every things went correct then replacing MB.. you will not able to repair the boards. as its just ONE Soc ,
to do screen standalone test ..
disconnect the MB from PSU
disconnect the LVDS between T-CON & MB from T-con side
on the socket of the PSU, you need to jumper
Pin 5 STBY_3.3V to PIN 9 Power_ON & pin 7 BL_ON & pin 26 T-CON_ON check the pins No. you have print chart on the boards... it may my memories went weak

take 12V from the pin 25 T-CON VCC and put it on the F fuse on the T-con
put it in wall and check what you will have on the screen..

Note if you are not sure by pins name or No... use 1KR when you do the jumpers to avoid any damage to PSU in case you did wrong at pins order

Note 2 you can do hard reset from plug it out from wall . press joystick and push down then plug in wall leave the push only when the front LED change from white to green

Diah Just so I understand you correctly. Jump Pin 5 to Pin 9 7 26 OR Jump 5 to 9 & 7 to 26 ( if your memory is correct ). Then Jump Pin 25 to the fuse on the T-con.

[Diah]

Diah Just so I understand you correctly. Jump Pin 5 to Pin 9 7 26 OR Jump 5 to 9 & 7 to 26 ( if your memory is correct ). Then Jump Pin 25 to the fuse on the T-con.

yes you are correct... on the power boards you have listed print chart of pins assignment No and name... do it correctly as name i wrote and the pins No as you have on the print chart

[Diah]

just be careful. on the socket you have 2 lines of pins Odd and even lol

make video to see how blue dark... you may have BL issue and then the red front LED blinks 5 time

[NolesFan]

yes you are correct... on the power boards you have listed print chart of pins assignment No and name... do it correctly as name i wrote and the pins No as you have on the print chart

Which is correct though
Jump Pin 5 to all three Pin 9 7 26
Jump 5 to 9 & jump 7 to 26

Ill try to make the video for you. I also have sound clip I just need to load it. The front LED never changes or flashes. When powered on it always stays solid white.

[nomoresonys]

Thanks guys for the info, Ill try to look into it tonight if I can but I have an odd question. I noticed yesterday when trying to do some testing, I was getting odd readings. I checked voltage at power cable where it meets PSB, and it read just 94v and this was on 2 different MMs to be sure. I then checked my outlet ( thinking maybe I had a bad common ) and it tested out at 120. Is that reading of 94 normal at the PSB? Im guessing no, because its just a cord and shouldn't have that sort of voltage drop thru the OEM cord.

Also this TV is new to me, so I'm only guessing on the Android start up sound. I hadn't realized there were 2 different sounds. Ill try to get a recording tonight if that will help with further diag.

If you have not, just unhook power cord from powerboard, plug just the cord into outlet and check voltage at end of cable without it hooked up to powerboard.

[NolesFan]

If you have not, just unhook power cord from powerboard, plug just the cord into outlet and check voltage at end of cable without it hooked up to powerboard.

116.4 OEM cord by itself plugged in to wall
94.7 OEM cord plugged into harness in to the wall

[NolesFan]

Here are 2 videos. One video is start up from being off. White light comes on bright then dims some but stays constant. Other video is slight movement and then from side.
Having trouble loading sound clip, file types are not aloud, but you can kind of hear it in video

[NolesFan]

My pin location chart:

[Diah]

connect pins 5 - 7 -9 -26 all together
connect one of pins 25-27-28 to T-CON fuse

the melody you have first setup screen... . before you do the standalone test do as i wrote at post #14 Note 2
measurement wall socket should be in AC not DC

[nomoresonys]

Seems like theres something wrong with the power cord, it should be very close to 120 both unhooked and hooked to powerboard.

[NolesFan]

Well not sure how to explain it, but its working. I started checking over the PB to MB harness, because I wasnt getting any reading on the STB or the ON voltage. So I unclipped the harness to make sure I was getting my probe in there to touch metal to get a reading and when I plugged the clip back in, I noticed the lights were changing, so I checked the screen and sure enough the TV started up, and was like it was just purchased, asked me to register and choose language and blah blah blah. Just want to thank the guys who put in effort to respond to me, it is much appreciated.

[nomoresonys]

Glad to hear it, must have been a bad connection, sometimes it just takes cleaning or unpulg and replug a few times to get it working, curious if the voltage at powercord was still less than 120.

[NolesFan]

Ill check tonight when home from work. Once it was working, I left it on overnight thru today to see if it would stay on. If it is, I suppose Ill invest in at least a new cord. Weird how that works, wonder how many people just toss tvs thinking its not worth fixing. This one I picked up for 50$

[Diah]

i mentioned yours eMMC Data in tact and yours melody first install... if the user don't know like David. keep silent other wise all TV will be in rubbish

[nomoresonys]

i mentioned yours eMMC Data in tact and yours melody first install... if the user don't know like David. keep silent other wise all TV will be in rubbish

You are correct sir, I would rather be the last one with the solution than be the first one to jump in with pure guess and speculation. Why drag someone down the wrong path when simple testing can determine the issue.

[Davi.p]

Don't think you have solved, i never seen so a stupid "repair" (well, it repaired itself), so the fault will come back.. also power kcord discourse is out of reason, with 26v at many amps you would have hot melting cable (200+W dissipating..)

[NolesFan]

Glad to hear it, must have been a bad connection, sometimes it just takes cleaning or unpulg and replug a few times to get it working, curious if the voltage at powercord was still less than 120.

Well tv has run 24 hours so far. Just shut it down, Ill see tomorrow if it powers on. The voltage though was scary, at the connector and fuse, with a Fluke and a Klein 66.8 and 66.7volts. Curious if the lessening of the voltage as time goes on was a reason for shut down? Physically there is nothing wrong with cord, Id like to think buying a new cord would change, but ? Suppose I could always make a new test cord and try that first.

[Davi.p]

You have a Fluke and you are not able to use it? Strange.. the power cord has surely no loss, but a test of it with ohm mode cannot let loose huge time.. don't waste time/money with a new cable, this is ridicolous.. a simple check is enough... "IF"" it's ok.. no.. scince it is ok the.main suspect is a bad wiring of wall plug, have you transferred the monster tv to another place and checked it? I suppose no since the size of it..