Sharp LC-37RD2E (serv.man6) Service Manual ▷ View online
LC-32RD2E/RU, LC-37RD2E/RU
6 – 5
2.3. IC301/IC302 (VHiTDA8931T-1Y)
2.3.1 Block Diagram
LC-32RD2E/RU, LC-37RD2E/RU
6 – 6
2.3.2 Pin Connections and short description
Pin No.
Pin Name
Pin Function
1
VSSD
Negative digital supply voltage; heat spreader
2
VSSA
Negative analog supply voltage
3
INN
Inverting input
4
INP
Non inverting input
5
VDDA
Positive analog supply voltage
6
POWERUP
Power-up input
7
ENABLE
Enable input
8
DIAG
Diagnostic output
9
CGND
Control ground; reference ground for pins POWERUP, ENABLE and DIAG
10
VSSD
Negative digital supply voltage; heat spreader
11
VSSD
Negative digital supply voltage; heat spreader
12
OVP
Overvoltage protection reference input
13
HVP
Half supply voltage output for charging SE capacitor
14
STABI
Decoupling of internal stabilizer
15
VSSP
Negative power supply voltage
16
OUT
PWM output
17
BOOT
Bootstrap capacitor connection
18
VDDP
Positive power supply voltage
19
HVPI
Half supply voltage output for reference voltage of input circuitry
20
VSSD
Negative digital supply voltage; heat spreader
LC-32RD2E/RU, LC-37RD2E/RU
6 – 7
2.4. IC1702/IC1741/IC1758 (VHiMP1415C+-1Y)
2.4.1 Block Diagram
2.4.2 Pin Connections and short description
Pin No.
Pin Name
I/O
Pin Function
1
BS
I
Boot strap. This capacitor is needed to drive the power switch's gate above the supply voltage.
It is connected between the SW and BS pins to from a floating supply across the power switch driver.
It is connected between the SW and BS pins to from a floating supply across the power switch driver.
2
IN
I
Supply Voltage. The MP1415 operates from a +4.75V to +18V unregulated input.
3
SW
O
Switch. This connects the inductor to either IN through M1 or to GND through M2.
4
GND
—
Ground. This pin is the voltage reference for the regulated output voltage.
For this reason care must be taken in its layout.
For this reason care must be taken in its layout.
5
FB
I
Feedback. An external resistor divider from the output to GND, tapped to the FB pin, sets the output voltage.
To prevent current limit runaway during a short circuit fault condition the frequency fold back comparator low-
ers the oscillator frequency when the FB voltage is below 400mV.
To prevent current limit runaway during a short circuit fault condition the frequency fold back comparator low-
ers the oscillator frequency when the FB voltage is below 400mV.
6
COMP
I
Compensation. The node is the output of the output of the transconductance error amplifier and the input to
the current comparator.
the current comparator.
7
EN
I
Enable/UVLO. A voltage greater than 2.62V enables operation. Leave EN unconnected if unused.
An Under Voltage Lockout (UVLO) function can be implemented by the addition of a resistor divider from Vin
to GND. For complete low current shutdown the EN pin voltage needs to be less than 700mV.
An Under Voltage Lockout (UVLO) function can be implemented by the addition of a resistor divider from Vin
to GND. For complete low current shutdown the EN pin voltage needs to be less than 700mV.
8
SS
—
Soft-start. Connect SS to an external capacitor to program the soft-start. If unused, leave it open.
LC-32RD2E/RU, LC-37RD2E/RU
6 – 8
2.5. IC1951 (VHiSii9025+-1Q)
2.5.1 Block Diagram
2.5.2 Pin Connections and short description
Pin No.
Pin Name
I/O
Pin Function
Digital Video Output Pins
144, 143, 142, 141, 140, 137,
136, 133, 132, 131, 130, 129,
126, 125, 124, 123, 119, 118, 117,
116, 113, 112, 111, 110
144, 143, 142, 141, 140, 137,
136, 133, 132, 131, 130, 129,
126, 125, 124, 123, 119, 118, 117,
116, 113, 112, 111, 110
Q0-23
O
24-bit Output Pixel Data Bus
1
DE
O
Data enable
2
HSYNC
O
Horizontal Sync Output control signal
3
VSYNC
O
Vertical Sync Output control signal
121
ODCK
O
Output Data Clock
Digital Audio Output Pins
97
97
XTALIN
I
Crystal Clock Input
96
XTALOUT
O
Crystal Clock Output
88
MCLKOUT
O
Audio Master Clock Output
86
SCK
O
I2S Serial Clock Output
85
WS
O
I2S Word Select Output
84
SD0
O
I2S Serial Data Output
78
SPDIF
O
S/PDIF Audio Output
77
MUTEOUT
O
Mute Audio Output
Configuration/Programming Pins
104
104
INT
O
Interrupt Output
102
RESET#
I
Reset Pin. Active LOW. 5 V Tolerant
32
DSCL0
I
DDCI2C Clock for Port 0. 5 V Tolerant
31
DSDA0
I/O
DDCI2C Data for Port 0. 5 V Tolerant
30
DSCL0
I
DDCI2C Clock for Port 1. 5 V Tolerant
29
DSDA1
I/O
DDCI2C Data for Port 1. 5 V Tolerant
Click on the first or last page to see other LC-37RD2E (serv.man6) service manuals if exist.