Panasonic TX-65FX623E identidy IC.

[tibd]

Hello
I haav a Panasonic TV model TX-65FX623E which dosn't show any picture. The backlight is on.
Upon testing the T-con i couldn't find the 12v at fuse, the fuse is ok.
I traced it back to the main bord and the QFN25 buck IC responsible for generating the 12v is in the pic below with marking BUTAPA. No shorts where detected and the IC is not heating. Input of 16v is there, and 3v on another pin which i presume is enable signal.

Cant find any data or schematics for further troubleshoting.

Any ideas or if anybody came across this buck converter IC and can share would be much appreciated. The main bord model is TNPH1196.
Best regards.

[tibd]

Re: Panasonic TX-65FX623E identidy IC.

Anoter pic with measured voltages at pins

[lotas]

Re: Panasonic TX-65FX623E identidy IC.

IC5260 pinout
The font and markings are very similar to Silergy.

[SMDFlea]

Re: Panasonic TX-65FX623E identidy IC.

IC5260 pinout
The font and markings are very similar to Silergy.

It looks like a silergy part to me too,but i can`t find it . Here`s a service manual for the Tx-49fxw584 https://www.manualslib.com/download/...-49fxw584.html IC5260 has panny part number C0DBAYY02857

.

[lotas]

Re: Panasonic TX-65FX623E identidy IC.

This could be a special Panasonic order from Silergy.

[SMDFlea]

Re: Panasonic TX-65FX623E identidy IC.

This could be a special Panasonic order from Silergy.

Yes it could be

[Diah]

Re: Panasonic TX-65FX623E identidy IC.

the IC are fine... its pin 11 receive I/O from main chips. to switch VCC... there are error come to the main chips or there any other reason with DC/DC or epprom/ emmc

[lotas]

Re: Panasonic TX-65FX623E identidy IC.

Yes, in the photo this board looks as if it was damp or had moisture, there is a lot of oxidation on the soldered components and rotten holes on the via tracks.

[tibd]

Re: Panasonic TX-65FX623E identidy IC.

Thanks a lot. A community that never lets you down.
I agree with the liquid/ moisture damage. Overall there are tons of signs of liquid damage, corrosion and rust not only on pcbs but also the metal body. Will check pin 11 and poke around, most probably a no-fix, going back to owner or for spare parts

[tibd]

Re: Panasonic TX-65FX623E identidy IC.

By the way. If I’m getting 3v on pin 11 as I mentioned in first post and post two(pic) then it might be wrong voltage? What to expect here? Any data sheets?

[Diah]

Re: Panasonic TX-65FX623E identidy IC.

I/O are bus signal not only current.. i would try to put DC/DC 12V regulator and DIY the chips with In from 15V and the out to pin 19.... then see what the main chip will proceed Video or audio signal as well the t-con & Panel

[tibd]

Re: Panasonic TX-65FX623E identidy IC.

I/O are bus signal not only current.. i would try to put DC/DC 12V regulator and DIY the chips with In from 15V and the out to pin 19.... then see what the main chip will proceed Video or audio signal as well the t-con & Panel

Exactly was i was planing to do. Have some tiny DC-DC buck converters with common GND which will suit the purpose.

Any ideas what power consumption T-con in such models generally have.

[Diah]

Re: Panasonic TX-65FX623E identidy IC.

Exactly was i was planing to do. Have some tiny DC-DC buck converters with common GND which will suit the purpose.

Any ideas what power consumption T-con in such models generally have.

t-con fuse A value /2

[tibd]

Re: Panasonic TX-65FX623E identidy IC.

Hello again.
Injecting 12v using dc-dc buck converter with common GND as of the attached pics. The tv shows steady pic. So it narrows the whole defect to the pwm ic first suspected. The question that remains is whether the IC can be bought, any known vendors that ship to Sweden? All answers would be much appreciated.
If anyone have a doner board can send a PM.
BR and thanks again to everyone for help.

[Diah]

Re: Panasonic TX-65FX623E identidy IC.

don't bother with this IC... unless you measure the bus signal with Oscilloscope. if main chips didn't send this signal you will have same result even new IC.. if i am i will Diy it with Regulator 12V mounted on the chassis with caps 2200uf 25V and shoot 2 birds in one stone..

[lotas]

Re: Panasonic TX-65FX623E identidy IC.

So maybe this chip is alive, check all the wiring of this chip according to the diagram (resistors (they may be broken), capacitors,..) wash this place with a brush with isopropyl alcohol.

[tibd]

Re: Panasonic TX-65FX623E identidy IC.

Shall do. Still though think the problem is the PWM IC itself. Even as a hobbyist i came across this problem several times which resolved by changing the IC but yet you have a good point here. I have no oscilloscop here otherwise i would've mentioned readings here.

[tibd]

Re: Panasonic TX-65FX623E identidy IC.

By the way, how about using a linear voltage regulator, sort of LM7812?

[Diah]

Re: Panasonic TX-65FX623E identidy IC.

By the way, how about using a linear voltage regulator, sort of LM7812?

passed with cap on output

[tibd]

Re: Panasonic TX-65FX623E identidy IC.

passed with cap on output

Thanks