Changhong Electric 21NF55, Service Manual, Page: 18 / 83

SERVICE MANUAL
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3. CHASSIS DESCRIPTION
1). General Description
EX-1A1 chassis series are applied in 21NF55/21PF93 respectively which uses mainly Philips’
advanced UOC-ultimate chip TDA935X/6X/8X and I
2
C-bus controlled IC. With combination of
microcontroller and small signal processor, the TDA935X/6X/8X series feature high-integration,
high-performance-to-price ratio and high-reliability and advanced functions with fewer external
components, which provide much convenience for manufacturing and technical service.
2). The EX-1A1chassis series mainly use the following ICs and assemblies.
Table 3 Key ICs and Assemblies
Serial
No.
Position Type Function Description
1 N100
CH05T0101
(TDA935X/6X/8X)
Microcontroller and small signal processor (UOC)
2 N200 AT24C08 EEPROM
3 N401 TDA8356/N6 Vertical scan output stage circuit
4 N402 HEF4053 Analog switch
5 N600 TDA7057AQ Sound power amplifier
6 N650 TDA7449 Sound processor
7 N861 STR-G5653 Power supply circuit
8 A100 TDQ-5B6M Tuner