Hello guys, i have an amplifier D class Impact that have as a driver board DLM4000a, i have checked everything on this board but without results, no swithicng impulses, I have already desoldered IRS2113 but it's not a problem i have no input signal to this IC. Audio input arrive to pin 9 of DLI4060b and after i don't understand what formed signal to HEF4001BT? Anybody could help to me? Thank you in advance