There are a lot of things that don't make sense.
1- If the diode is on the big black heat sink when it only dissipates 2.5 watts and the 317 is on a little heat sink when it would need to dissipate over 10 watts. Besides the diode looks like it has 3 leads when viewed from the bottom side.
indeed it looks like that...but the middle pin is not connected anywhere...
also the lm317 INDEED its feed from the smaller diode the axial one! i said
that before also there's a red line on the second photo that shows it.
here's an update..
i tried an lm338t costed but nothing seemed to power up...then i got back to the lm317T and although it powered up.. i've lost the output from the lm317t!
when i tried to measure the voltage on the supplying diode it was almost zero (few mV)
that voltage looks like it is coming from one of the windings of the transformer so i probed there too but nothing! so i thought that the lm338t was a bad idea and the tranformer winding burned istead of the regulator.
while i was inspecting the board i thought i should check if there might be any component
that acts as a load (short circuits the output of the 317) and i dissoldered a 1000uF/25v
capacitor so i can measure it...the cap was ok and i soldered it back i tried again the power supplyand everything worked perfectly
no heat on the lm317r nothing! the dvd was working just fine!!!! then i decided to put the power supply board back to it's place and close it...but when i powered the dvd nothing worked no leds no display nothing! and after few seconds a heard a noise and the SMPS ic litarary exploded!!!
what a mess........
i don't even remember the part number of that ic...i only remember it was started with "ICE" which is part code of the infineon........
help!