panasonic TXL 24X5B surface mount zener diode colour codes

[jimbofz]

hi can anyone help on a panasonic txl24x5b main board ,i have two s/c zeners both with same colour code
brown orange green zd701 zd702
its board number 715g5317 mof 000 004b
this tv uses the t121 chassis ,
cant find any cct diagram on the net .
these two diodes kill the 5v supply and hence no power up back to psu
i believe this board is also used in some polaroid models

[dick_barton]

Re: panasonic TXL 24X5B surface mount zener diode colour codes

It could be 13V but that is only going by the following reference
https://jestineyong.com/about-zener-diode-color-code/

[jimbofz]

Re: panasonic TXL 24X5B surface mount zener diode colour codes

It could be 13V but that is only going by the following reference
https://jestineyong.com/about-zener-diode-color-code/

thanks
i thaught it may be same as resistor code but the green band is for tollerance.

the cct diagram seems impossible to find
even though panasonic is a well known
brand ,these days you just dont know what lies within ,
to me it doesnt look like a vestel

[budm]

Re: panasonic TXL 24X5B surface mount zener diode colour codes

Can we see good clear pictures of the main board and also where the diodes are located?

[jimbofz]

Re: panasonic TXL 24X5B surface mount zener diode colour codes

Can we see good clear pictures of the main board and also where the diodes are located?

here are some pics
i found a good working zener with same colour code in centre of pic 3 so i removed it and tested its zener voltage
( with 10k and bench supply)
it read 5,4 v
so i fitted tempory 5.6 v diodes (there silver in color )
i now had 5.2v 3,3v ,
the 16v supply is 19.5v but thats to be expected as theres no load on it .
the sby led is not red but rapid flashing green for few seconds then off
the 3.3v was present on the standby button and goes to 0v when pressed
at this point i noticed a diode missing from board shown in pic 3 bottom left corner shown as d701
clearly someone has been here before me ,i dont know the history of this tv as it was a freebee
i like most of us ,enjoy the satisfaction of a completed repair