Sony Genezi MHC RG290 shuts off when volume up
If the speakers are in good condition, it is possible that the amplifier is heating up and consuming more current than necessary or that the source does not deliver what corresponds, in any case you will have to check and comment if you saw something like an embedded capacitor or rehearsals with the overheated body, if you find nothing and the measurements of the source are fine, it is likely that the audio output is coming to an end.
Hello, how are you friends, I already disassembled the amplifier board and I do not see any capacitor intruded or false contacts, I just have to measure the voltages to see in what conditions they are attached image of the maiboard amp
https://ibb.co/gFY3ZB2
It is a fuse resistor and feeds the negative input -PRE of the STK with -42.3 V, change it and check if there is nothing else like a transistor with problems in the current temperature detectors, and output protection.
Hello friend Carlos Quiroga I tell you to change the Resistance but it keeps going off I will test the transistors as you tell me and the part where the amp is and for safety I will change these Capacitors I do not see them inchados but maybe they are regulating badly since in the At the moment I don't have how to measure them, the ones that are in yellow are the ones that I will change and the one that is in red was the resistance I put since someone who has more knowledge than me told me that I could place it https://ibb.co/Z1VFdBS https://ibb.co/DL7DkvB
hello everyone I changed the filters of the fan stage and from the 3.3 and 9V voltage regulators I also changed the Q043 1266, the resistance of the amplifier stage from 47Ohm to 1/2 I put one of 47 to 5w since I could not Find the same one, I also changed the filters of the same one and I did a test of 2 songs max of volume and the team worked correctly I am going to do a test with a cd of 22 songs to max of volume to see how it works, ehh I forgot to mention To review the welds of most circuits, any questions or concerns will comment.
Okay. perfect, in one of the photos the C015 seems to be a little bulging at the top, the same in the other photo a little less than the one behind C447, greetings.
Hello, I tell you, Everything Perfect, but after a while the team was shutting down for a while, I mean 1 to 2 hours, not for the fan stage but for the STK, I left it running for a while and now a single channel is playing for I will proceed to change it, and it should be working without inconvenience ... as soon as I do I will notify you and close Forum, thank you very much.
This is the Stk that I put the Being from above the original and the endorsement of the replacement, I clarify I returned the orignianl and the team did not put on standby thing that does with the replacement but with none of the 2 there was Audio https : //ibb.co/cbzQV30
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