rci ranger 2950 not powering up

[Airwaves]

hi guys my brother had this radio and it was working until he got hold of it,so i asked him did he cross the polarity wires and of course he said he did not,but im not sure i believe him as hes not the greates come this kind of stuff.

am wondering if the D105 diode needs changing as i had a look and it does not look good so could indeed be the problem especially if it was wired wrong at the psu end.
thing is i have no D105 diode here,i have D103 D108 etc,can i put in any other diode apart from the D105 ?

[Airwaves]

any suggestions please as to if i could use a different diode to the D105 ?.

[Buick Mackane]

Snip the diode then see if the radio powers up, Most silicon diodes should suit as a replacement, Just be sure to get the orientation right

[Whisky1]

Yep snip it.

[Airwaves]

i snipped it and still not powering up.....
any ideas as to where i go from here ?.

[ch25]

Take DMM and trace voltage from power socket onwards. You'll find where it disappear.

[Airwaves]

so trace from the power socket on up to the on/off switch ye?.

[Edd200sx]

Also disconnect the Pa as shorted mosfets may stop it starting up
The am regulator if short (likely) would do it also.

If in doubt send it to repair with someone