iii
Contents
1.
Circuit description ....................................................................................................................1-1
1. 1 Power circuit ......................................................................................................................1-1
1. 2 Detailed description of each circuit ................................................................................ 1-2
1. 2. 1 Pseudo-resonance circuit method ........................................................................ 1-2
1. 2. 2 Switching circuit operation .................................................................................... 1-3
1. 2. 3 Description of operation ........................................................................................ 1-4
1. 2. 4 Protection circuit ..................................................................................................... 1-6
1. 2. 4. 1. Latch circuit ............................................................................................... 1-6
1. 2. 4. 2 Overheat protection circuit ...................................................................... 1-6
1. 2. 4. 3 Overvoltage protection circuit ................................................................. 1-7
1. 3 PWB-MAIN basic specifications ............................................................................... 1-8
1. 3. 1 Basic specifications ................................................................................................ 1-8
1. 3. 2 PWB-MAIN circuit block diagram ......................................................................... 1-9
1. 3. 3 Input/output connector pin assignment ............................................................. 1-10
1. 4 Video input signal specifications .................................................................................. 1-11
1. 4. 1 Video interface peripheral circuit ....................................................................... 1-12
1. 4. 2 Horizontal/vertical synchronizing signal input circuit ...................................... 1-13
1. 4. 3 Composite sync V separation circuit ................................................................. 1-14
1. 4. 4 Sync On Green synchronization separating circuit ......................................... 1-15
1. 4. 5 TMDS receiver ...................................................................................................... 1-17
1. 4. 6 Input signal presence judgment function .......................................................... 1-18
1. 4. 7 Input signal switching control function .............................................................. 1-21
1. 5 DDC interface peripheral circuit ................................................................................... 1-24
1. 5. 1 DDC switching control function .......................................................................... 1-25
1. 5. 2 DDC2BI/DDC CI function (only DVI-I connector side) .................................... 1-28
1. 5. 3 EDID data write protect control function ........................................................... 1-29
1. 6 Power peripheral circuit ................................................................................................. 1-30
1. 6. 1 DC/DC converter and panel power specifications ........................................... 1-31
1. 6. 2 DC/DC output voltage design sheet .................................................................. 1-32
1. 6. 3 Power rising/falling edge sequence control function ...................................... 1-37
1. 6. 4 Reset circuit ........................................................................................................... 1-39
1. 7. Panel interface ................................................................................................................ 1-40
1. 7. 1 Switch substrate interface ................................................................................... 1-41
1. 8 Inverter circuit .................................................................................................................. 1-42
1. 8. 1 Basic configuration ............................................................................................... 1-42
1. 8. 2. Circuit block diagram ........................................................................................... 1-42
1. 8. 3. Input/output terminal functions ........................................................................... 1-43
1. 8. 4. Detailed description of each circuit .................................................................... 1-44
Summary of Contents for NEC MultiSync LCD1550X LCD1550X LCD1550X
Page 88: ...SCHEMATIC DIAGRAM POWER LCD1550X Normal Power Save 1ch Pin 4 2ch Pin 1 3ch Pin 2 4ch Pin 5...
Page 89: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X...
Page 90: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X...
Page 91: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X...
Page 92: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X...
Page 96: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X...
Page 97: ...SCHEMATIC DIAGRAM INVERTER LCD1550X 1ch Q701 B 2ch Q702 B...
Page 98: ...SCHEMATIC DIAGRAM PWB SW LCD1550X...
Page 100: ...SCHEMATIC DIAGRAM POWER LCD1550X...
Page 101: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X...
Page 102: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X...
Page 103: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X...
Page 104: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X...
Page 105: ...SCHEMATIC DIAGRAM PWB MAIN MC LCD1550X...
Page 106: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X...
Page 107: ...SCHEMATIC DIAGRAM INVERTER LCD1550X...
Page 108: ...SCHEMATIC DIAGRAM PWB SW LCD1550X...
Page 127: ...16 Document No VSPF A028 Bave Average brightness of 1 to 9 10 50 90 90 10 50 5 1 2 3 6 9 8 7 4...
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