Sony KDL-65W850A Dead

[budm]

Re: Sony KDL-65W850A Dead

The thread was long so I did not read the whole thing.
The BL_ERROR, when TV is in standby, it should be around 3VDC, when the TV is turn on and no error is detect then it should go low and stay low, if the error is detect then it will will go back high to indicate problem, that is what is used n most SONY TV.
No error code blinking LED on the front panel?

[budm]

Re: Sony KDL-65W850A Dead

BTW, I did not find the SM at ELEKTROTANYA, can you provide the link to the SM?

[dick_barton]

Re: Sony KDL-65W850A Dead

Hi Budm, That's the problem. All I have to go on is the pictures provided in an earlier post and they are not very clear.

[kevinm34232]

Re: Sony KDL-65W850A Dead

Here's a few more pics, I'll be back in a few mins, thanks for the help!

[kevinm34232]

Re: Sony KDL-65W850A Dead

BTW, I did not find the SM at ELEKTROTANYA, can you provide the link to the SM?

I had to buy the service manual online, it's 40MB, if you have somewhere I can upload it let me know, or I'll zip it and email you guys.

I didn't find it super helpful so far.

I can take better pictures of whatever you need too, thanks.

[budm]

Re: Sony KDL-65W850A Dead

Does the SM say anything about blinking LED Error codes?

[kevinm34232]

Re: Sony KDL-65W850A Dead

Yes there's quite a bit, more than this... I get no LED flashing at all though.

[kevinm34232]

Re: Sony KDL-65W850A Dead

[Service Manual]

[budm]

Re: Sony KDL-65W850A Dead

It is strange that you are not seeing any error blinking codes.
I will have to download the SM when I have the time to look through them.

[budm]

Re: Sony KDL-65W850A Dead

Post 14:
But I was not able to jump the backlights on, I tried applying 3.3v to BL_ON along with PS_ON but nothing. It actually drags the 3.3v down.

That 3.3V does not sound right for it to be dragged like that.

[kevinm34232]

Re: Sony KDL-65W850A Dead

Well I don't know what the reason is, but using the 12V to the BL_ON with a 1K resistor, the voltage drops to 6V on the BL_ON, whereas the REG+12V says at 12V everywhere else.

[kevinm34232]

Re: Sony KDL-65W850A Dead

It is strange that you are not seeing any error blinking codes.
I will have to download the SM when I have the time to look through them.

Well the only voltage present at first is the 3.3V standby at the main board. The SM is then saying to check DC/DC converter. However, that voltage comes from the REG+12V, which only comes up when I jump PS_ON.

It would seem according to the SM it should be there in standby, but I am not sure.

Also, those test points it says to check on the main board, have no no idea what they are asking to check. They seem to point to nothing on the board.

[kevinm34232]

Re: Sony KDL-65W850A Dead

Any way by looking at those 2 power boards to know if the one to the left should have voltage at the rectifier when just plugged in? 120VAC is being supplied from the other board as shown, but only the primary board has power. Also note that the PS to right has 166V at the main caps, and 396V when PS_ON is on.

[Diah]

Re: Sony KDL-65W850A Dead

Here's a few more pics, I'll be back in a few mins, thanks for the help!

photo No 1, disconnect the following

socket from main board to audio driver
LVDS from main boards to T-CON

power on and tell which voltage you get.

Sony some how had no standby LED, just LED turn on at normal operation and can turn it off via menu

[kevinm34232]

Re: Sony KDL-65W850A Dead

photo No 1, disconnect the following

socket from main board to audio driver
LVDS from main boards to T-CON

power on and tell which voltage you get.

Sony some how had no standby LED, just LED turn on at normal operation and can turn it off via menu

Nothing changed..

[Diah]

Re: Sony KDL-65W850A Dead

i tip 90% main boards dosnt boot and send signal to PWB, freeze or heat the main boards chips then plug it on ..and check result of LED status flashing or not.

[dick_barton]

Re: Sony KDL-65W850A Dead

Unfortunately the service manual doesn't help with the power supplies.

The two boards are connected together with the white/black wires. Is there mains on both boards at the white connector points. I also see 2 white ceramic fuses on the one board by the mains in. Have they checked out as OK?

[dick_barton]

Re: Sony KDL-65W850A Dead

APS-352 and APS-356 is second PS. BTW the second PS board, AC is connected from one to the other, but I only 1 have 1VAC at the 2nd bridge rectifier, not sure if it is supposed to kick on with a relay somehow..

You say you only have 1VAC on the 2nd bridge but which bridge is it. Is it on the 352 or 356 board and what is it's component number.


Photo's courtesy of Shopjimmy

[budm]

Re: Sony KDL-65W850A Dead

The Bridge on the LED power supply 356 will not get any AC to the bridge untel the board get the BL-ON signal to turn on the power relays RY6102/6103 to supply AC to the bridge D6101.
Right now we know that the main board has at least one problem, it is not sending the PS-ON to turn on the power supply board.

[dick_barton]

Re: Sony KDL-65W850A Dead

You won't have any AC voltage on bridge rectifier D6101 on the APS-356 until the relay operates. This is a 12V dc relay. Measue the coil resistance which had diode D6616 across the terminals with your meter set to ohms. It should be 12 ohms.

Edit
Updated coil resistance in later post