Yamaha Msr400 Input Board Problem

[falcontech]

Good morning everyone
I have a problem with this input module of an active speaker of the Yamaha (MSR400), the signal transmitted by this unit and sent after the EQ module and then end up the amplification form is lower than normal, I attribute the problem to this Module because with that of the twin box works perfectly, I thought of the three capacitors highlighted in the photos and that I have not yet replaced or the operational highlighted NJM2860L, the strange thing I noticed that by trying with the jack by pulling it a little out of the normal position the earnings is normal, while when everything is inserted you don't have any signal, but the jack contacts are perfect, instead with the xlr as I said it is very low thanks for those who can help me

[sukaht]

Hello everyone.
I need help with my Yamaha MSR400 - Powered PA Speaker that I bought it used recently.

It is power on, and sounding good / working perfectly fine. However after 3 - 5 minutes, the heatsink is starting to get warm, and it smells burning a little bit.
I did tried multiple times on different day, event the speaker is not playing any song (input does not connect to any source, and the volume level is zero), after it turns ON, 5 minutes later, the heatsink is starting to get warm, and it smells burning a little bit. I am afraid keeping it ON longer than 5 minutes because it might damage it further.

What is possibility causing this? The Power Supply, or the Amplifier, or something else?
Thank you in advance for help and suggestions

[check12]

the strange thing I noticed that by trying with the jack by pulling it a little out of the normal position the earnings is normal

This is a bad connection... try re-soldering the pins to the pcb for the jack & XLR sockets (even if they look fine)... if that doesn't work then there may be a physical problem with the jack socket itself & it may need replaced.... but from what you say seems like a simple bad connection....