LG LX-D2640, Руководство по обслуживанию

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Muting circuit Troubleshooting (if MUTE)
Q700, Q750, Q720, Q770, Q730 Base “LOW”
Q700, Q750, Q720, Q770, Q730 collector “Low”
MUTE
Q783, Q784, Q785 “E” High check
Each appropriate TR replacement
IC703 5, 6, 7 pin High check
IC703 Troubleshooting check
PATT check
IC702 pin10, 14 pin signal input check
IC701 pin8, 12, 13 signal input check
IC701 pin10 “High” check
IC701 Power check replacement
IC702 pin12 “High” check
IC702 power check replacement
Q702 Base “H” check
Q720/Q770/Q730
Base “L” check
Q702 Base “H” check
No sound
Ic702 pin 4, 6 signal output check
Realy connected check
R781 voltage check
Q780 Base “H” check
Speaker connected check
Speaker connected check
IC701 pin3, 4, 15 signal output check
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON