Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

[tom66]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Yup, tested and retested with my meter, no signs of any current flow.

OK. Does it still do 8 blinks?

[386]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Yup, still the exact same error.

Also, I just tried disabling pins 5 - 8 on CN4001 (AU_13V and AU_GND), which can be seen on page 34. Just experimenting, it didn't effect the error/behaviour.

I've also noticed on page 25 there's "AU-PROT" on the top right hand side, which is meant to connect to BU board via CN1001? I can't locate the that connector? Am I missing something? Also, sorry if I'm searching totally off track here. Thanks again

[tom66]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Unfortunately the "BU" board is "too complicated" for technicians to service. It must be replaced only. What a load of crap!

[386]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Wait, does the "BU board" (on page 25) mean the BG1 board? Since I couldn't locate the BU board, I did a google image search for "BU board tv" and nearly all the results seem to be of boards which look like the main BG1 board from this model. In which case where on earth is the CN1001 connector? Is that possibly a typo or from an earlier schematic?

Edit: Yet, it says that the diagram on page 25 is of the BG1 board, and it has the CN2000 connector to the speakers on the diagram, which is correct on my actual board. But I've looked a number of times for the CN1001, and a board stamped with "BU", with no luck. Maybe I'm going blind, haha.

[tom66]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Can we see a picture of inside of your TV - all the guts. I have a feeling the BU board will have video processing on it ("Bravia Engine" or whatever they call it.)

[386]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Unfortunately it's currently night time here, so it was difficult to get enough light for particularly good photos, but here they are anyway:

https://dl.dropbox.com/u/51809914/Ev...20IMG_3789.jpg
https://dl.dropbox.com/u/51809914/PS...20IMG_3790.jpg
https://dl.dropbox.com/u/51809914/In...20IMG_3794.jpg
https://dl.dropbox.com/u/51809914/BH...20IMG_3796.jpg
https://dl.dropbox.com/u/51809914/Tu...20IMG_3797.jpg
https://dl.dropbox.com/u/51809914/UT...20IMG_3800.jpg

The linked images are slightly higher quality than the ones uploaded directly to the forum, as the forum converts them to smaller size. If you'd like a close up photo of any particular section, or of one of the other sides of a PCB, just let me know

[tom66]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

I'm thinking it's either of the other two green boards. The board in the middle, I suspect that's the 100Hz motion interpolator. The board near the top is possibly the main processor, although it may be the digital tuner.

You can try unplugging the top digital tuner board and seeing if that works.

But other than that, I'm not sure where to go from here, other than suggesting random board swapping.

[386]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

I believe the green board in the top right corner to be the tuner. It's labelled DTAU2MB, and the daughter board sitting on top of it is DTAU_FE. One of the first things I tried was powering up the TV with various boards disconnected, all combinations seemed to leave the 8 blink error. Apart from disconnecting the CN4002 connector (on BG1 board), which resulted in the standby LED giving two blinks, which indicates an issue with the 12v power supply, which makes sense. But, apart from that I've been unable to modify the error/response at all.

[tom66]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

The digital tuner appears to be an OEM, non-Sony part. Makes sense that they would order one in for different countries.

With how the TV is currently set up, I'm guessing you can't probe the trace you cut on the bottom?

[386]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Not with everything connected/with power on.

[tom66]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Not with everything connected/with power on.

What is the part # on the BG1 board, if any? Maybe it is available cheap.

[386]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Is the part number the number just below where it says BG1 on the previous photo?

https://dl.dropbox.com/u/51809914/IMG_3742.jpg

[tom66]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Is the part number the number just below where it says BG1 on the previous photo?

https://dl.dropbox.com/u/51809914/IMG_3742.jpg

That's probably it.

I found a similar part but for the UK model. Hence it has SCART etc. It was £24.99. However, no luck with your particular board.

If you can find a TV with a smashed screen, the main board may be cannibalised.

[exsonyexpert]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

if 12v is present to bg1 probably u have a problem 12v regulator found on the bottom of ur bg1 near speaker terminal i already edited the test point of ur bga but i dont know how to post

[386]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

if 12v is present to bg1 probably u have a problem 12v regulator found on the bottom of ur bg1 near speaker terminal i already edited the test point of ur bga but i dont know how to post

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[386]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

I found a similar part but for the UK model. Hence it has SCART etc. It was £24.99. However, no luck with your particular board.

Tom, could you please link me to that part anyway? It's a possibility I guess. Cheers for all your help!

[tom66]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Tom, could you please link me to that part anyway? It's a possibility I guess. Cheers for all your help!

I will try and dig it up.

[386]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Any luck finding that link, Tom?

Also, if anybody else has any other ideas on how to fix/diagnose the problem, or where to buy parts from, please let me know!

[Jasman]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Hello, sorry to be digging up old posts but can anyone please repost the service manual, because the ones linked in this post are ofline.
Greetings from the Azores

[nomoresonys]

Re: Sony Bravia KDL-40D3100 - Doesn't Turn On - Standby Light Blinks 8 Times

Hello, sorry to be digging up old posts but can anyone please repost the service manual, because the ones linked in this post are ofline.
Greetings from the Azores

http://www.toms-service-manuals.com/...h=Submit+Query