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1.
Circuit description
1.1
Power circuit
(1) The power block is compatible with 100 to 120VAC/220 to 240VAC. (Automatically tracked)
(2) The power supply section is a PRC (ON width control with constant OFF time) during P-SAVE, and
operates as a pseudo-resonance circuit in the steady state.
By feeding back via the photocoupler IC903 from the output voltage with the HIC (STR-G6452)
flyback converter type switching IC (IC901) with built-in POWER-MOS FET and separate-exciting
control IC, the voltage is constantly controlled to prevent output voltage fluctuations caused by AC
input voltage fluctuations and secondary side load fluctuations.
(3) Switching of the PRC and pseudo-resonance is controlled by inputting to IC901 via IC905 with a
microcomputer signal.
(4) The secondary side output voltage of this power circuit is a single-phase 12V.
Microcomputer signal (J901 1 PIN)
IC901 oscillation frequency
Standby mode
(PRC mode)
L
Approx. 20kHz
Normal mode
(pseudo-resonance mode)
H
Approx. 50k~150kHz
<Block diagram>
AC100~120
220~240
Transformer
Vcc
IC901
F/B
IC903
12V
IC905
Starting resistance
To inverter
To main
IC904
+B
EMI filter
Rectification
Rush
prevention
HIC control IC
Shunt
regulator
P-SAVE
microcomputer
signal
Содержание LCD1550X-BK
Страница 82: ...3 TROUBLE SHOOTING Contents No Power No Picture Abnormal Picture or Ineffective Adjustment 1 2 3 Page 1 2 4 ...
Страница 88: ...SCHEMATIC DIAGRAM POWER LCD1550X Normal Power Save 1ch Pin 4 2ch Pin 1 3ch Pin 2 4ch Pin 5 ...
Страница 89: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X ...
Страница 90: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X ...
Страница 91: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X ...
Страница 92: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X ...
Страница 96: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X ...
Страница 97: ...SCHEMATIC DIAGRAM INVERTER LCD1550X 1ch Q701 B 2ch Q702 B ...
Страница 98: ...SCHEMATIC DIAGRAM PWB SW LCD1550X ...
Страница 100: ...SCHEMATIC DIAGRAM POWER LCD1550X ...
Страница 101: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X ...
Страница 102: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X ...
Страница 103: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X ...
Страница 104: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X ...
Страница 105: ...SCHEMATIC DIAGRAM PWB MAIN MC LCD1550X ...
Страница 106: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X ...
Страница 107: ...SCHEMATIC DIAGRAM INVERTER LCD1550X ...
Страница 108: ...SCHEMATIC DIAGRAM PWB SW LCD1550X ...
Страница 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 ...
Страница 152: ...LCD1550X BROCHURE LiquidView SCALE NTS DIMENSION IN mm Fig 11A FRONT REAR FINAL CONDITION 420 297 ...
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