Haier 29FV6H Service Manual page 17

in Table 4. (Use a fluke 87III digital multi-meter or other digital multi-meter.)
Table 4
No.
GROUND
1
VERTICAL SCAN WAVE OUTPUT
2
3 POWER VCC2
4 REFERENCE
5 VERTICAL RAMP WAVE INPUT
POWER VCC1
6
PUMP UP OUT
7
9. Power circuit
The installed switching mode power source is a typical autonomous pulse switch
power source. The circuits are comprised of power hybrid IC N501 (STR-G9656),
switching mode transformer T501 (Bridge-rectifier components).
power switch is on, the pulse voltage of the 220V voltage rectified by VD502,
which is the same function as the Bridge-rectifier circuit, is filtered by the
capacitor C507 to obtain +300V direct current, which is added through (3)-(7) of
the switching mode transformer T501 to the drain polar of IC N501.Primary coil
1-2 provides a power supply to pin 4. The coupler N503 (HS817B/C) functions to
control voltage, and the voltage tolerance information from C561 are transmitted
to pin 5 of N501 to control the switch velocity and hold the output voltage normal.
The pulse voltage output from the secondary of the switching mode transformer
T501, rectified and filtered by diodes and capacitor to come into being a serial
direct current voltages. The main supply voltage output from pin 9 is 125~130V.
The 13V voltage output from pin 12 is regulate by V556, N504 and N505 to come
into being 9V and 5V. The voltage of VT(33V DC) comes from the main voltage
through R570.
The inner part of the STR-G9656 are as follows:
4
START
REG.
Function
VIN
O.V. P LATCH
OSC
17
Working
Voltage (V)
13.66
DRIVE
−
+
Vth1
−
+
Vth2
3 GND
0
25.5
3.28
3.28
25.2
2.38
When the
1
D
s
2
O.C.P/F.B
5