Sony KDL-55EX640 (630) DEAD SET

[t4796]

Re: Sony KDL-55EX640 (630) DEAD SET

good update lol

I'm happy with how it has resolved so far. When I initially opened it and saw the state the power and main boards were in I was expecting the worst from the panel (although it looked in good shape cosmetically) as well.

I noticed if I swapped the ends of the second bigger LVDS cable it made a difference to the weird speckles, still something wrong, but less noticeable somehow. I found a little nick in the edge partway along the cable, didn't look like it made it in to any of the conductors, but I taped it up anyway and cleaned all of the connectors and cable ends.

If that cable was good, plugging the end that previously went to the T-CON to the mainboard shouldn't have caused any change in image right?

In addition, after reassembling, I also think I had something shorting out around one of the bonds because there was a bar which changed from normal image to flickering bar. I reseated everything correctly and that has gone, touching on the bond for that part of the panel didn't seem to reintroduce this fault, so I think all good at this stage.

Put it all back together and the strange red bits are gone.
Will need to order the S101 IC and work out that zener value next. Some other monitors with same IC had a 5.6V zener in that location.

Thanks for your help once again BUDM.

Photo doesn't do 55" justice. This thing is large!

[budm]

Re: Sony KDL-55EX640 (630) DEAD SET

I am curious as to what to output pad of the S101 IC is at this stage, if it is normally HIGH or normally LOW for the TV to function, and may be if the Zener Voltage is wrong and caused the IC to short out since it monitors the AC line Voltage.
I am glad is working now.

[t4796]

Re: Sony KDL-55EX640 (630) DEAD SET

I'll watch it for a day or so, then I'll take some more measurents over the weekend. The voltages at the FB input of ICE?

[budm]

Re: Sony KDL-55EX640 (630) DEAD SET

Pin 1 (Delay output) FPO pin, open Drain output.
Pin 4 (Non-delay output) NDFPO, open Drain output.
They are open Drain output, so right now without the IC in place, then pin 1 and pin 4 pads should show as HIGH due to the pull-up resistors.

[junkmale172]

Re: Sony KDL-55EX640 (630) DEAD SET

Sorry to jump in the thread. So glad you got yours working, now lets try mine. I have the same exact tv with no standby light. I get the 3.3v on pin 1 of CN2 leaving the power supply. I also get the 3.3v on the main board. I traced power to the switch and press the switch and I see the voltage drop when button is pressed and goes back to 3.3v when I let go. I am stuck and need some help. I found the tv on trash day, and it will be a good fix.

[newtothis]

Re: Sony KDL-55EX640 (630) DEAD SET

Sorry to jump in the thread. So glad you got yours working, now lets try mine. I have the same exact tv with no standby light. I get the 3.3v on pin 1 of CN2 leaving the power supply. I also get the 3.3v on the main board. I traced power to the switch and press the switch and I see the voltage drop when button is pressed and goes back to 3.3v when I let go. I am stuck and need some help. I found the tv on trash day, and it will be a good fix.

Meter set to DVC 600v .. Probes to MAIN cap (450v) Red to + Black to - . Careful not to touch anything or let the probes slip as you are working on the HOT (Deadly) side

[junkmale172]

Re: Sony KDL-55EX640 (630) DEAD SET

Thanks for reply and some help on this. I get 392v, when testing the MAIN cap its rated @ 450v

[tw2005]

Re: Sony KDL-55EX640 (630) DEAD SET

pretty impressive recovery. BUDM is a wizard

[budm]

Re: Sony KDL-55EX640 (630) DEAD SET

pretty impressive recovery. BUDM is a wizard

Thanks, it's the good pictures that made a big difference for me to be able to help.

@junkmale, so not even any error blinking at all? It is obvious that some how the main board is still sending the PS-ON otherwise you will not have the PFC Boosted Voltage of 392VDC on the legs of the main filter cap.

[junkmale172]

Re: Sony KDL-55EX640 (630) DEAD SET

budm, nothing. when I plug up the set. no blinking light, no nothing

[budm]

Re: Sony KDL-55EX640 (630) DEAD SET

OK, please report all the pin Voltages with pin names for all the pins on the connector of the power supply board that goes back to the main board when TV is plugged in and when the power switch is activated so we can see what are missing.

[junkmale172]

Re: Sony KDL-55EX640 (630) DEAD SET

using the same photo that you posted from shop jimmy. 15pin connector labeled CN2
pin1 3.33v
pin2 2.94v
pin3 3.29
pin4 0
pin5 0
pin6 0
pin7 0
pin8 0
pin9 0
pin10 .4
pin11 0
pin12 0
pin13 nc
pin14 0
pin15 0
when i press power button on tv, values stay the same

[budm]

Re: Sony KDL-55EX640 (630) DEAD SET

Names of each pin please.

[junkmale172]

Re: Sony KDL-55EX640 (630) DEAD SET

1 3.3vstb
2 ACD
3 Pwr_on
4 audio12v
5 audio12v_gnd
6 reg_12v_gnd
7 reg_12v_gnd
8 reg_12v
9 reg_12v
10 BL_ERR
11 BL_ON
12 PWM Dimmer
13 NC
14 TconVcc12v
15 Tcon_on

[budm]

Re: Sony KDL-55EX640 (630) DEAD SET

So the PWR-ON is stuck on, but at the same time there is no 12V or 12V for T-CON.
You do have Main board problem and also the 12V in the power supply board.
You may want to read this thread since he has the symptom like yours, no LED.
https://www.badcaps.net/forum/showth...ny+KDL-55EX640

Is this your TV or you got it from someone else worked on it before you? I wonder if the flashing the firmware will help.
http://esupport.sony.com/US/p/model-...3#/downloadTab

[junkmale172]

Re: Sony KDL-55EX640 (630) DEAD SET

i found the tv outside on trash day, favorite way to shop, it doesnt look as if anyone has done anything to it. I thought about firmware, but I cant load it because I can't get the tv to turn on. I will read the post you linked, thanks.

[junkmale172]

Re: Sony KDL-55EX640 (630) DEAD SET

Read that post before, but was unable to locate the main board...anywhere to buy these parts, anything for this tv is hard to locate. After seeing this updated post I thought to give it a try. But I will spend the money for the new board if I have to, I mean I got the tv free.

[budm]

Re: Sony KDL-55EX640 (630) DEAD SET

The screen does not have to light up to update firmware, that is the good thing about the SONY.

[junkmale172]

Re: Sony KDL-55EX640 (630) DEAD SET

i will check into that...from all directions it says to turn on tv

[budm]

Re: Sony KDL-55EX640 (630) DEAD SET

I read some where, I cannot find that thread right now, on badcaps that the firmware can be updated even the screen is not on, but I am not sure if it will work with this model and since you do not even have any indicator LED so the main board may be dead.