Q7T3-FP737S Dual function LCD Monitor Service Guide
Circuit Operation Theory
7
Confidential
#5 PWM Controller
The PWM controller NCP1200A implements a standard current mode architecture. With an internal structure
operating at a fixed 40KHz. Where the switch time is dictated by the peak current set-point. When the current
set-point falls below a given value. The output power demand diminishes, the IC automatically enters the so-called
skip cycle mode and provides excellent efficiency.
Fig. 6
#6 Feedback circuit
PC123 is a photo-coupler and TL431 is a shunt regulation. They are used to detect the output voltage
change and be the primary and secondary isolation. When output voltage changes, the feedback voltage will
be compared and duty cycle will be decided to control the correct output voltage. (See Fig.7)
Fig. 7
Содержание Q7T3-FP737S
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Страница 60: ...Q7T3 AUO Panel LCD Monitor Service Guide Alignment Procedure 6 b LVDS Cable with tape c Lamp wire with clip...
Страница 62: ...Q7T3 AUO Panel LCD Monitor Service Guide Alignment Procedure 8 f Spacer g Signal cable with clip...
Страница 63: ...Q7T3 AUO Panel LCD Monitor Service Guide Alignment Procedure 9 h Bracket Cover i Plug under AC socket...
Страница 67: ...Q7T3 AUO Panel LCD Monitor Service Guide Alignment Procedure 13 b C603 C604 L606 L607 c C615...
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Страница 110: ...Q7T3 CPT Panel LCD Monitor Service Guide Alignment Procedure 5 Fig 1 Factory Mode On Fig 2a Burn In Mode Button...
Страница 111: ...Q7T3 CPT Panel LCD Monitor Service Guide Alignment Procedure 6 Fig 2b Burn In Mode ON 2 Wire Dressing a RSDS Cable...
Страница 113: ...Q7T3 CPT Panel LCD Monitor Service Guide Alignment Procedure 8 d Al Foil Mylar on the shielding cover e Spacer...
Страница 114: ...Q7T3 CPT Panel LCD Monitor Service Guide Alignment Procedure 9 f Signal cable with clip g Bracket Cover...
Страница 115: ...Q7T3 CPT Panel LCD Monitor Service Guide Alignment Procedure 10 h Plug under AC socket i Main Grounding Wire...
Страница 118: ...Q7T3 CPT Panel LCD Monitor Service Guide Alignment Procedure 13 3 Add Glue a C605 b C603 C604 L606 L607...
Страница 119: ...Q7T3 CPT Panel LCD Monitor Service Guide Alignment Procedure 14 c C615...