PLEASE READ THE ENTIRE DESCRIPTION :)
So, before i start, THIS IS NOT A REPAIR TUTORIAL, this is just a walkthorugh of actions i took in order to repair this monitor.
In case you need the pinout of the main amp: www.datasheetdi...
In case you need the schematic for KRK Rokit 6 G2 music-electron... (did not help me that much :/)
First of all i have visually inspected the motherbaord and i checked capacitors (all of them) and replaced bulged ones - there were four. I replaced main ones that go to the AMP (TDA7296) 2x3300µF/50V and 2x1000µF/35V - the rest seemed OK.
Since that did not help i started measuring values around the amp:
- Values of rest of the capacitors (there are 2x10µF and one 220µF) - they also seemed OK
- Input VOLTAGE (i believe) pin 15 and pin 13 - see pinout (power actually splits and goes to other pin as well - just follow it) - ~60V seemed OK
and since power was going to the chip i searched for singnal input (pin 3 on the main AMP) - signal was there (in the video) so i figured out that amp was broken and decided to replace it - yeah, that did nothing as well
Next thing i did was look at the schematic of the chip and there was a mute pin which was connected with a diode and a capacitor - BINGO! - gunk of death destroyed the diode and after i replaced it speaker started working again.
*If i have said something wrong, please correct me :
**also yeah, i know i curse a lot :) what can you do... :)
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10 сен 2024