LG LST-4200A Service Manual - Page 21

Analog Audio Output

Get LG LST-4200A PDF manuals and user guides View all LG LST-4200A manuals
Add to My Manuals
Save this manual to your list of manuals

Page 21 highlights

2) Check MSP4448G and its around circuits. Is 5V supplied into IC400 NO (10, 16, 49, 63)? YES NO Is 8V supplied into IC400(31)? YES Check Power Supply part. Is 12V supplied into IC401(1)? YES Check Power Supply part. Is 18.432MHz Clock supplied to NO IC400(54,55)? YES NO Is data pulse supplied to IC400(6)? YES NO Is 48kHz clock supplied to IC400(4)? YES Does analog audio sound at NO IC400(28,29)? Check X400. Check IC203. Check IC203. Check IC402 and its around circuits. Fig.04 Analog Audio Output 3-12

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
3-12
Is 5V supplied into IC400
(10, 16, 49, 63)?
Is 8V supplied into IC400(31)?
Check Power Supply part.
NO
Is 12V supplied into IC401(1)?
Check Power Supply part.
NO
NO
YES
YES
YES
YES
Check X400.
Is 18.432MHz Clock supplied to
IC400(54,55)?
NO
YES
Check IC203.
Is data pulse supplied to IC400(6)?
NO
YES
Check IC203.
Is 48kHz clock supplied to IC400(4)?
NO
Check IC402 and its around circuits.
Does analog audio sound at
IC400(28,29)? <Fig.04>
2) Check MSP4448G and its around circuits.
Fig.04
Analog Audio Output