Sony KDL-46CX525 6x blinks backlight dead?Possible replacement with LED's?

[Meins321]

Good evening everyone!

I do own a Sony KDL-46CX525 witch blinks 6x Times at startup and won't display any picture..

the Inverter looks fine, no burnt spots or anything.

Tested the startup in full darkness, could see a logo/menü something for a split second.. thus inverter or ccfl fail. (could be powersupply also?)

What should be replaced or done?

Can i fake the inverter ok signal and check the lcd if it is working with a LED torch?

How much voltage is on the inverter ok on the 24V unregulated output side?
The Service Manual states 2,65V or more is ok, can i take some resistors and do a resistor divider on the backlight ok?

http://electronicshelponline.blogspot.de/2013/04/sony-bravia-kdl-32cx525-kdl-40cx525-kdl.html

[CapLeaker]

Re: Sony KDL-46CX525 6x blinks backlight dead?Possible replacement with LED's?

Check the transformers on the inverter board. Compare them with each other. There should be no more than 3% difference. Also you can lift them off and check the board underneath for hot spots. A bad transformer usually runs hotter than the others.

[Meins321]

Re: Sony KDL-46CX525 6x blinks backlight dead?Possible replacement with LED's?

thank you for your fast reply, well it would be nice to take out the inverter and run the telly just wihtout it

does anyone know how to do this?

Inverter Ok gibes me 3,2~3,3V from the powersupply to the logic board, should be possible to create with some resistors from the 12V regulated supply on the powersupply

If i can get it to work with picture and sound but no backlight

[budm]

Re: Sony KDL-46CX525 6x blinks backlight dead?Possible replacement with LED's?

What is the inverter board P/N?

[anmol]

Re: Sony KDL-46CX525 6x blinks backlight dead?Possible replacement with LED's?

First try resoldere all transformer and transistor with good flux.

wbr

[Meins321]

Re: Sony KDL-46CX525 6x blinks backlight dead?Possible replacement with LED's?

Inverter is a Samsung,
Type: SSI460_12F01
Serial Number: 03319AWB18T354B0

@CapLeaker @anmol: i can't run the inverter long enought to keep the backlight warm, i will look at the inverter closely if there are solder cracks...
As the lcd shows some picture very shortly i think it is the ccfl backlight not the inverter itself because it tries to run, and then the tv goes to 6 blink...
Maybe it is the powersupply but then i need to fool the connection to it from the inverter into a good state to give it some time to start up.

Theres no hissing, whining from the inverter or powersupply ^^

[ReeceyBurger123]

Re: Sony KDL-46CX525 6x blinks backlight dead?Possible replacement with LED's?

You need to check the secondary resistance of the transformers. Common issue on them inverters is failed tarfos.

[budm]

Re: Sony KDL-46CX525 6x blinks backlight dead?Possible replacement with LED's?

http://www.shopjimmy.com/samsung-lj9...t-inverter.htm
Samsung LJ97-03319A
I would check the transformer real close and check the resistance of the secondary side of the Inverter transformer.
There are many threads on this inverter board and the failed transformers:
https://www.badcaps.net/forum/search...archid=5640032

[Meins321]

Re: Sony KDL-46CX525 6x blinks backlight dead?Possible replacement with LED's?

http://www.shopjimmy.com/samsung-lj9...t-inverter.htm
Samsung LJ97-03319A
I would check the transformer real close and check the resistance of the secondary side of the Inverter transformer.
There are many threads on this inverter board and the failed transformers:
https://www.badcaps.net/forum/search...archid=5640032

The first link gives me access denied and the second one says no thread on the forum...

Ok will check the transformers of the old inverter! Can i just measure resistance while they are still soldered in?


Can i replace the inverter with:

Inverter Board LJ97-02743A SSI460_12A01 from a philips?
Is it the same as the SSI460_12F01 maybe just a different revision?

[budm]

Re: Sony KDL-46CX525 6x blinks backlight dead?Possible replacement with LED's?

I do not know what happen to the link I gave:
https://www.badcaps.net/forum/search...archid=5647287
Yes, you can test the resistance of the secondary side winding without removing the transformers.