Tatung V32FLBB, Service Manual

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10.3 Inverter Board
The Power Module pr24V through CN3 #3~7 (Red wire) and offers 3.5A (typical) to both
Inverters on LCD panel.
The brightness adjustment in OSD menu is to control the voltage at P16#11 while this voltage is
offered by Q40, which inverts the state of I16 #w10. The range of the voltage is from 0V to 3.3V. If the
voltage of P16 #11 is 3.3V, the screen will get light; if it’s 0V, the screen will get dim. It means that the
different voltage will change the lamp current through the inverter to make the screen lighter or dimmer.
10.4 Power Module :
Refer to chapter 11.4 Power Module (PB01) pin assignment and sheet 15 of PWB-0713.
Power Module (PB01) provides 24V
、
12V
、
5V to Main Board via wire P016A and connector P16
#1~2(Blue wires)
、
#3~4(Yellow wires)
、
#5~7(Red wires).
The Backlight control signal from I16#W10 (Scalar: PW218) is applied to Inverter through P16# 11
(Green wire) on Main Board, CN2#11 and CN3#2 (Blue) on Power Module.
Switching 24V
、
12V on or off is controlled by I16#B10 (Scalar: PW218) and applied to Power
Module (PB01) via P16# 12~13 (White wires) on Main Board, and CN2#12~13 on Power Module.
10.5 Video/ TV Expand Card : (Optional)
Refer to circuit diagrams sheet 1and 2 of PWB-0733.
This Video Expand Card processing video and audio signals is no need for pure monitor.
(1) Video : Different video signals, including Composite video (CVBS), S-Video, Component
Video(YPbPr), entry though this board. Composite and S-video signals are fed to I22 (Video decorder)
through I801 (video switch) to decode video format, and then fed to I16 (Scalar). Component signals
are fed into I28 (Video Decoder) through I801 (Video Switch) to decode video format, and then
connect to I16 (Scalar).
(2) TV : TV signals from antenna enter UT01#1( Tuner: FQ1236 MK3). UT01#14 outputs Audio MPX
signal, while UT01#12 outputs TV (CVBS) video signal. Audio MPX signal is applied to Audio
Processor I2 (MSP3440) to do MTS demodulation. Audio signals such as Mono, Stereo, SAP could be
output and then amplified through I3 (Audio Power Amp.) to speaker.
(3) Audio : Other audio sources are respectively connected to different left and right channels of Audio
Processor ( I2
：
MSP3440 ). Which audio will be output is controlled by I34 (MCU) and selected
through I2 (Audio Processor). Then, the selected audio source will be sent to speaker through I3
(Audio Power Amp:TDA8925) .
(4) Closed-caption and V-chip :
These functions are built in I16 (Scalar: PW218) and controlled by firmware.
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