Television and Home Theater

I'm trying to get a Philips tv up and running. It's model 27PT6441 chassis L04.1U AA. Diode 3503 is in need of replacement and I'm having a problem. I can't seem to find a replacement any information on it, any parts I can substitute etc. On the service manual it's listed as part 4806 209 87877 but i can't find it online. It says it's a DSP301NA21F. Can anyone help me out, what are it's specs, can it be substituted with something else?. It also has  three colour bands orange,black and blue or maybe it's the other way around blue,black,orange? I'm not too familiar with this.

Hi I am getting an error code of

3  then 7 blinking red lights on the status light

What to do?

any help much appreciated

sanyassin 

my sony's ic's have bit the dust like every one else .   my  red convergence is all out wack, will not line up or flash focus .  ive got my d board (a-1302-180-a)  out  of the set  and im  debating on weather to replace the ic's or replace the whole  board . 

can some one please tell me what all i need to do if i replace just the ic's  . what kind of soldering gun and solder .  what all will i have to do once i get it back in as far as alighning the picture .