Sony KD-43X8309C

[tehmatix]

Hi,
This tv is coming with no light at LED standby, no picture, no sound.
When power button is pressed nothing is change
I checked the power board and found 3.3V and 12V.
I made allready a hard reset with volume- and power button .
Any ideeas ?

[tehmatix]

Re: Sony KD-43X8309C

Hello guys, any ideas will be helpful !!!!!

[nomoresonys]

Re: Sony KD-43X8309C

can you post good straight on pictures of each board and one of the whole back, as to see how everything is connected.

[tehmatix]

Re: Sony KD-43X8309C

Hi,
Pictures of the tv

[nomoresonys]

Re: Sony KD-43X8309C

can you get a clear close picture of the map/legend right there by R6410, maybe check all the diodes and resistors on top of the board.

[tehmatix]

Re: Sony KD-43X8309C

Hi
Could be a backlighting issue? I will check the leds with a tester.

[nomoresonys]

Re: Sony KD-43X8309C

ok, also see if you have the ac_detect voltage there on your connector on powerboard, and trace the standby wire back to mainboard and see if you have that 3.3 voltage on the mainboard connector.

[tehmatix]

Re: Sony KD-43X8309C

On CN6401 ac_off_det = 3.475V and standby voltage on the mainboard is 3.475V
The backlight LEDs are ok and voltage on the rectifier diode(cathode) of backlight power supply is 65.6V

[Davi.p]

Re: Sony KD-43X8309C

Main board is the main suspected, almost 95%, on it near the power connector, that 20 pin soic chip is a PIC16 microcontroller? if yes must be reprogrammed, not sure it solves..

[nomoresonys]

Re: Sony KD-43X8309C

does the optical port on mainboard light up when you try to turn on tv?

[William1967]

Re: Sony KD-43X8309C

Looks like a bad EMMC, in more than 95% the EMMC has reached the "end of life" status and must be changed with a new loaded EMMC.

[Davi.p]

Re: Sony KD-43X8309C

Whatching THIS.. and .. THIS.. it seems a proper PIC microC, so i bet for that..

THe tv has no signs of life so bad standby SW, that reseats in the PIC..

[lotas]

Re: Sony KD-43X8309C

In these chassis, eMMC Flash and the MediaTek processor (SoC) are mainly dying.

[tehmatix]

Re: Sony KD-43X8309C

Hi guys,

Thank you for your support. From the beginning I suspected the mainboard with a bad eeprom .
Indeed, it's a PIC microcontroller on the board PIC16F527. Can be reprogrammed or replaced?
If it is a bad EMMC can be replaced?

[lotas]

Re: Sony KD-43X8309C

eMMC

[Davi.p]

Re: Sony KD-43X8309C

must be reprogrammed, two ways to test, first reading it normally, TL866II+ could support maybe, save, freeze the chip, read again, compare dumps, if changes write the second back. Other way, search the web for a dump.

[tehmatix]

Re: Sony KD-43X8309C

Hi guys, if I will replace the mainboard with a functional one what changes would I need to make?

[nomoresonys]

Re: Sony KD-43X8309C

match up the numbers of the white sticker on the replacement board to your board to make sure you get the right one, may have to do a firmware update/pair after you put in new board.