good morning to all colleagues .... I have arrived at the workshop a TV sony kdl70w857b problems on the main board in view that the main could not be solved was bought new but still does not turn on thank you for your apollo ... thanks the main original blick 3 times in red and the new one lights in white and blinks green and anbar and there is only one left ...... I think it came without software

3 flashes in the bravia is dc error, check the voltages that are in the value that says the connector

the old main is short .... that's why it blinks 3 times ..... and I charge the firmware if it does not turn on ... only green and yellow blick (amber) is left, nothing more ... I achieved read from a manual of another model that the problem has to do with the compatibility of the t-icon with the main card

if they are the same main cards it was even bought in sony service .......

You told them it didn't work and what does it do? What did they tell you in sony?

[quote="tobiastv"] did you tell them it didn't work and what does it do? what did they tell you in sony? [/quote] do not

Probably, once due to double screen problems in a 40-year sony and after 6 months of expiration of the warranty, an email was written to Sony Argentina and they replaced it with a new unit, anyway, did you check the voltage of the source? you never answered me: D

the source is perfect .... the voltages remain accurate .... what I do not know if entered into service mode can solve something .... because the service manual for that TV I have not managed to get

It does one thing, observes the two plates very well in search of differences between the two plates, especially, in the perisphere of the remote keyboard connector, lvds and the micro, it may be that one has smd resistors in places that the other plate does not, once I spend replacing a main with another equal the same code but different tv model this is the lvds connector I also had differences in the remote keyboard connector and even the eeprom had to change to turn the screen ... Did you try to disconnect the tcon to see if it starts?

I'm on my way to do the tests .... to see what the result is

good afternoon and a thousand thanks in advance to all who shook my hand in this repair ..... it was indeed software problem ..... the compatibility of the main card with the T-com that was the problem thousand thanks for the support ... you thank them ...... and excuse a thousand thanks .....

Hi, I can ask how you fixed the tcon with the main yellow and green lights