SAMSUNG Proprietary-Contents may change without noticeFlow Chart of Troubleshooting3-10This Document can not be used without Samsung's authorization3-1-5. Receiver Part3-1-6. Speaker PartThere is no sound from the ReceiverIs the terminal of ReceiverO.K ?NoReplace the ReceiverYesNoYesCheck UCP300Check V103,V104 (LCD PCB Part)Is there any signals at thepin#P11 and pin#N12 ofUCP300 ?ENDThere is no sound from the BuzzerIs the terminal of SpeakerO.K ? Replace the SpeakerIs there any signals at thepin#R12 and pin#P12 ofUCP300 ? Check U202,VR103,VR104ENDYesYesYesYesNoNo