A few days ago a friend bought a cps1 A board on AliExpress, the pcb works fine except the audio, the audio is lost when turning it on, the sound lasts less than a minute and goes away and you end up hearing interference sometimes, my friend asked me for help to repair it. The pcb had poor quality parts throughout the audio section and the entire audio section was replaced completely with original components from another dead cps1. Z80 processor was replaced, the 3 mixer preamplifiers, Oki M6295, Yamaha 2151, Ym3012, Ha1301 Amplifier, Ram tmm2015, Pal Sou1, 3.57 mhz quartz crystal, surface mount resistors and capacitors, the electrolytic capacitors were also replaced with new ones , the volume potentiometer was changed and the problem still persists.
In the image I show are exactly all the components I replaced. Has anyone had a failure like this?
View: https://youtu.be/eYF7_zIiPvw?si=PydEUZ7SXRqO-2-m
In the image I show are exactly all the components I replaced. Has anyone had a failure like this?