Sony kd 43x85k no power at all - not even the click for power.

[lfhlaw]

I got this Sony KD 43X85K TV. It will not power on, No LED light in front.

1) I did check for blown Capacitors and I didn't see any bulging Capacitors, but that doesn't always mean there isn't a bad one present.
2) I was going to check voltages at the pins and I did get some voltage, but got confused as there are 14 pins, but the descriptor on the left of the pin connections has only 9.
Voltages i did get were a 3v which is usually stand-by power IIRC, and 2 pins had 13v and I was reading similar voltages to the main board. But unless I'm able to figure which pin is which, it makes assessing more difficult i think.

Or is there a different component I should be looking at?

Thoughts?

[Diah]

on the right side of the socket you have the reset of Pins GND t-con_on and T-CON VCC 12V .. and 12V
so do the messing again over all and listed here the messing by Pins number

[lfhlaw]

Ok so for the 14 pins, from bottom to top based on the picture.

pin voltage
1 0.11 v
2 NC
3 NC
4 NC
5 NC
6 12.6V
7 12.6 V
8 12.6 V
9 NC
10 NC
11 3 V
12 NC
13 NC
14 NC

[Diah]

you still reading the Pins on socket in wrong way. the socket had 2 row pins

row 1                            row 2
1 - BLINKING                             2- PWM1_DIMMER
3- DC_DIMMER                          4- NC
5- NC                                         6- NC
7- BL_ON                                   8- BL_ERR
9- POWER_ON                          10- GND
11- GND                                     12- GND
13- REG 12V                              14- REG 12V
15- REG 12V                              16- REG 12V
17- REG 12V                              18- REG 12V
19- GND                                     20- GND
21- GND                                     22- GND
23- GND                                     24-GND
25- TCON VCC 12V                     26-TCON_ON
27- TCON VCC 12V                     28- TCON_VCC 12V

we are interesting on PIN messing
7 , 8, 9, (13,14,15,16,17,18) , 26, ( 25,27,28 )

however you wrote you have 12V but we dont know if this REG 12V or TCON VCC, at the end i suspect MB... but you can try always disconnect the screen totally from the T-CON , if the TV work you will have the audio Optic Port öit red.

[lfhlaw]

So I did attempt to check more of the pins, but with the connector out of the socket. (multimeter set to 20 v max)

The bottom row from the left to right, the 5th,6th, 7th pins only had 0.14, 0.15, 0.17 volts. (not sure on the orientation and pin numbering of the socket) everything else was NC.
I believe I was testing the correct pins now?

I also disconnected the panel from the T-con, connected the main board to the power board, attempted to turned power on, and the Main board optical port didn't light up.

[Diah]

so the sockets pins Numbers calculated, you need the PSU connected to MB, and flip the PSU to measure the V from downside , mark first on backside pins 1 and 2 as it show here they start messing

[lfhlaw]

so the sockets pins Numbers calculated, you need the PSU connected to MB, and flip the PSU to measure the V from downside , mark first on backside pins 1 and 2 as it show here they start messing

Ok. Will do that, but as I work. This part may take me a bit longer to get to. Maybe Friday Evening for me.

[lfhlaw]

So I was able to do the voltages now, correctly I believe LOL.

I have uploaded pictures on the back...and I haven't done any soldering of any sort.

[lfhlaw]

So the Tcon pins are negligble, does it mean the Tcon is bad, or the powerboard? I did plug the Panel back into the T-con. just to make sure that didn't effect t he testing.

Also, pin 8 has power and that means BL err Or does that mean that pin 7 isn't on?
pin 9 has the requisite power on I'm assuming.

[tiki66]

It's a new tv and it's a Sony so don't expect bad capacitors. Since you have 12V going to main board it's probably main board fault. If it wasn't, it would probably give error code (red light blinking). You can try factory reset (press power button on TV while plugging it into socket), and eventually you can try software update from usb stick, but it probably won't start if it's completely dead.

[lfhlaw]

It's a new tv and it's a Sony so don't expect bad capacitors. Since you have 12V going to main board it's probably main board fault. If it wasn't, it would probably give error code (red light blinking). You can try factory reset (press power button on TV while plugging it into socket), and eventually you can try software update from usb stick, but it probably won't start if it's completely dead.

So replacement of the main board, brought the TV back to Life. Got a complete set of boards, but only replaced the main board for a cheap $25.