Chip Introduction - Haier 29FV6H Service Manual

The video amplifying circuits supply voltage output from pin 10 of the T401(FBT-B-19)
is 180V~200V. After VD406 and C462, 180V is transmitted to the CRT printed circuit
board by one shield wire.
The vertical scan supply voltage for N301 output from pin 8 of T401(FBT-B-19)
is 27V.
At the left side of the main printed board, there is one small printed board, which
is the second power circuit. This circuit supplies 32V DC power for audio
amplifier N601(LA4282). From the main printed board at XP505 to the CA603 on
the left small printed board, there is one line, supplying the 300V DC power for
the small print board. The left small printed board works basically the same as
the main printed board's power circuit, but it uses STR-G6353, not STR-G9656.
The STR-G6353 works the same as the STR-G9656. Every pin is the same
definition as the STR-G9656. Please refer to the STR-G9656.
The left small printed board provides 32V and 36V DC power. The 32V is for
N601 (LA4282), which is used to amplify L and R audio signal, and the 36 is for
N602(LA4282), which is used to amplify bass signal. In the 29F9K (Indian), we
only have N601(LA4282), the bass signal is not demand, so only 32V DC power
is necessary. If the 36V DC at RA609 is hang in the air, the voltage will rise to
more than 50 V, which will result in the damage of the STR-G6353. So, we use
one resistor (1/2W-10K) to connect the DC power and the GND.
10. E-W output circuit：
HAIER8829A-V1.0
waveform signal from pin 28 will be send to output circuit consist with V426,
V421, v423, L421.All the horizontal distortion alignment will be implement via
I2c bus.
B. Chip introduction
1. Definition of every pin of HAIER8829A-V1.0
Step
1
MUTE
2
LED OUTPUT
3
KEY INPUT
4
DIGITAL GND
5
CPU RESET
6
CPU CLOCK
7
CPU CLOCK
8
GND
provide E-W control signal at pin 28. Parabolic
Function
18