Chassis Description - Toshiba 21E88 Service Manual

3. CHASSIS DESCRIPTION

General Description
CN-18EA chassis is applied in 21E88 series. By use of Toshiba V/C/D-MCU 2IN1 IC for TV small
signal processing and bus control, the chassis enables TV tuning, adjustment, control and picture
correction, featuring high-integration, high-performance-to-price ratio and high-reliability and
compact circuit with fewer external components. The chassis, widely used in small and medium TVs,
provides much more convenience for manufacturing and technical service. It includes:
2IN1 IC TMAP8801PSBNG for PAL/NTSC/SECAM small signal processing and bus control
EEPROM AT24C16 for data memory
LA78040 for vertical output power amplifying
TDA8944J (stereo)/TDA8943SF (mono) for audio power amplifying
TDA9808T combined with MSP3410G into NICAM/IGR demodulator
Thick-film IC STR-G5653 for power circuit adjustment and control
The following features are available in the chassis:
Color systems: PAL/NTSC/SECAM
Sound systems: D/K B/G I M
236 programs preset
Multilingual on screen display
2
I C bus control
NICAM/IGR/AV stereo
Selectable picture/sound modes
Intelligent lock
Message board
Telephone directory
Game
Biorhythm
Calendar inquiry
The chassis mainly uses the following ICs and assemblies.
Serial
Position
No.
1 D702
2 N201
3 N301
4 N601
5 N801
6 NN01
7 NN02
8 U101
SERVICE MANUAL
Table 5 Key ICs and Assemblies
Type
AT24C16
TMPA8801PSBNG
TDA8943SF/TDA8944J
LA78040
STR-G5653
TDA9808T
MSP3410G
TDQ-5B6M
Description
EERPOM
2IN1 IC (Small signal processor + micro control
unit (MCU))
Audio power amplifier
Vertical scan output stage circuit
Switch-mode power supply control
Audio IF demodulator
NICAM audio processor
Tuner
30