My sony HCD GN 1300D auto switch off after 3 minutes of run.

https://diagramasde.com/blog/102776/hcd-n555av-pdf-hcd-n555av-pdf.html

Click link and download manual:
https://servicemanuals.us/sony/audio/hcd-rv222da-hcd-rv333da-hcd-rv555da-mhc-rv222da-mhc-rv333da-mhc-rv555da.html

Ave you ran a lens cleaner?unplug ed it lastllymost have a reset button very small yyou red a straitin like object t insert good luck

Hi
It might be either to the fault to its main system control IC or, with its firmware. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Hopes that you might get some details related to this. I'm too is a technician; since 43 years, and I can understand the difficulty to troubleshoot; especially to Sony brand sets.
surf the site I've linked here. If you wish to get any more assistance from me, come over to me by Fixya comment. OK?

Sony HCD-GN1300D AUTO FUNCTION CHANGE

I need to unlock a Sony mhc 1300D mini hi fi component , make it to play all the region

From the description you have provided, the audio output ic is loading the system down causing it to shutdown, the remedy! replace the audio output ic. But to check! power off, remove speaker wires from back and power on, if standy stays on, the above part must be replaced, but if standby stays off there is short in one of the wires and speaker.

These digital amps are very prone to blow if the speaker wires are shorted so Sony appear to have put in a protection system that mutes the amp when this happens. You have to unplug the amp for a minute till the light goes off, make sure no speaker wires are touching each other and then it should work ok. I found the same problem with one I bought 2nd hand.

Put your player into „Standby“ Mode and enter one of the following commands if necessary:

Remote control command Function
[0] [RETURN] Default Default region code on the player
[1] [RETURN] Region 1
[2] [RETURN] Region 2
[3] [RETURN] Region 3
[4] [RETURN] Region 4
[5] [RETURN] Region 5
[6] [RETURN] Region 6
[P. MODE] [RETURN] Only play DVDs with the selected region; auto switching OFF
[AUDIO] [RETURN] Default Auto switching ON
[ANGLE] [RETURN] Enable video interference impulses (Macrovision ON)
[SUBTITLE] [RETURN] Default Disable video interference impulses (Macrovision OFF)
[PREV] [RETURN] Enable user operation prohibitions* and access restrictions
[NEXT] [RETURN] Default Disable user operation prohibitions* and access restrictions

* The DVD can no longer prohibit you from using the fast-forward, chapter change or Audio-/Subtitle-/Angle switch. You can no longer be forced to watch intros. Just press [TITLE] or [DVD MENU] and select PLAY.

sony hcd-va550. when switched to cd the display reads initial.