friend of the forum I entered the workshop a 15-inch powered speaker speaker embassy brand model cs-15 the owner wanted to fix it and could not bring it to me half disassembled I fixed it there was a problem at the source but as I cut the speaker cables I do not know on the board of the board the speaker is connected there are 3 chips on the board the board has this numbering nes-h-778a-pcd if someone can help me with this problem thanks carlos