Sony KV-32LS65AUS (serv.man4) Service Manual ▷ View online
1.3 21 Pin Connector
Figure 1.1 21-pin Euro connector
3
1.4 Board Overview
Figure 1.2 Board Overview (KV-32LS65AUS)
4
Chapter 2 Power Supply Circuit
2.1 Power Supply Block Overview
Figure 2.1 Power Supply Block Overview
2.2 Function Overview
The main power supply diagrams in AE-6B chassis are shown as
Figure 2.2 and Figure 2.3. It is similar to FE-2 and LE-3 chassis.
Meanwhile, the power supply circuit for AE-6B and AE-6D chassis is
almost similar. The difference is there is an additional G1 board in AE-
6D chassis.
The primary power supply on the AE-6B chassis G board consists of
three parts:
1. Oscillator
2. Output stage
3. Regulator Stage
The oscillator starts up to produce an initial signal for the output stage.
The output stage develops voltage to continue running the oscillator
stage, supply the regulating stage and provide normal output for the
TV. One of the normal TV outputs is used to start the secondary power
supply.
The output stage develops voltage to continue running the oscillator
stage, supply the regulating stage and provide normal output for the
TV. One of the normal TV outputs is used to start the secondary power
supply.
Oscillator Start Up
The oscillator within IC6001 starts if the VSENSE input voltage at pin 1
is above 1.3 VDC but less than 8 VDC
is above 1.3 VDC but less than 8 VDC
.
The block diagram of IC6001 is
shown in Figure 2.4.
Sample voltage from pin 18 is then used to run the internal oscillator.
The initial frequency is approximately 230 kHz. The low amplitude
initial oscillator signal is output IC6001 / pins 12 and 16 into the
driver/output stage.
The initial frequency is approximately 230 kHz. The low amplitude
initial oscillator signal is output IC6001 / pins 12 and 16 into the
driver/output stage.
5
Driver / Output Stage
The oscillator voltage output at pins 12 and 16 use drivers Q6006 and
Q6007 to develop T6002 secondary voltages. IC6001’s oscillator will
shut down if the driver transistor’s current is excessive. To prevent
premature shutdown, the timer capacitor C6007 (refer to Figure2.3)
delays the shutdown.
Q6007 to develop T6002 secondary voltages. IC6001’s oscillator will
shut down if the driver transistor’s current is excessive. To prevent
premature shutdown, the timer capacitor C6007 (refer to Figure2.3)
delays the shutdown.
VC1 Powers IC6001
Although the oscillator is running at the initial frequency of 200 kHz,
there is insufficient current from T6002 to produce any unregulated
output voltage because of the load. There is a little load on D6008
(refer to Figure 2.3). This voltage is returned to IC6001 / pin 8 (VC1) to
serve as regulated +B for the IC.
there is insufficient current from T6002 to produce any unregulated
output voltage because of the load. There is a little load on D6008
(refer to Figure 2.3). This voltage is returned to IC6001 / pin 8 (VC1) to
serve as regulated +B for the IC.
IC6001 Normal Operation
At start up, IC6001 initially uses current limit +B from pin 18 to power
internal drivers. These internal drivers amplify the oscillator signal and
get out to pins 12 and 16. When the power supply stage works, the
power comes for the bottom driver, VG(L); pin 12 from pin 10 (VC2)
and for the top driver, VG(H); pin 16 from pin 14 (VB). The VB voltage
is approximately +5V (average) above the reference voltage at
IC6001/pin15.
internal drivers. These internal drivers amplify the oscillator signal and
get out to pins 12 and 16. When the power supply stage works, the
power comes for the bottom driver, VG(L); pin 12 from pin 10 (VC2)
and for the top driver, VG(H); pin 16 from pin 14 (VB). The VB voltage
is approximately +5V (average) above the reference voltage at
IC6001/pin15.
Regulator Stage
This voltage supplies the top internal driver that amplifies the oscillator
signal that leaves IC6001/pin 16. The regulating stage uses error
detector IC6003 and optical isolator PH6001 to monitor the output from
T6002. If the output is low, the voltage fed back to IC6001/pin 2 goes
HIGH, decreasing the oscillator frequency. The decrease in frequency
increases the output of T6002.
signal that leaves IC6001/pin 16. The regulating stage uses error
detector IC6003 and optical isolator PH6001 to monitor the output from
T6002. If the output is low, the voltage fed back to IC6001/pin 2 goes
HIGH, decreasing the oscillator frequency. The decrease in frequency
increases the output of T6002.
6
Click on the first or last page to see other KV-32LS65AUS (serv.man4) service manuals if exist.