Haier HT-3768, Service Manual

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Rear cover 0090202355
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VI. SPECIFIC INFORMATIONS
A. Principle integrated circuits
A1. HT-3768 color TV set composed of the following sections
(1)
Small signal processing: super monolithic integrated circuits
N204(
TMPA8803CSN
). and memory N901 (AT24C08).
(2) Sound power amplifying: integrated circuits N701 (
TDA2611
).
(3) Horizontal and Vertical scan output circuits: Vertical output integrated
circuits N402 (
LA7840
), Horizontal output transistor V411 (2SD2499),
Horizontal flying back transformer T402 (JF0501-19908).
(4)
Switch power supply: switch transformer T501 (BCK-08A6), power
transistor V503 (2SC4584).
(5)
AV switch integrated circuits N203 (TC24C08).
A2. Main integrated circuits:
(1) TMPA8803CSN Microprocessor
Picture IF/sound IF/video processing/H and V
Scan/color decoding
(2) TDA2611 Vertical output integrated circuits
(3) LA7840 Sound power amplifying integrated circuits
A3. Electrical circuit analysis
1
Microprocessor and Small signal processing: super monolithic integrated
circuits TMPA8803CSN
TMPA8803CSN is super large integrated circuit decoder, containing
intermediate image amplifying, intermediate sound amplifying, horizontal and
vertical scan, small signal processing, color decoding, hi-pressure tracing
and over-load protection, I
2
C bus control.
Information introducing functions and testing data for maintenance is listed in
Table 1.
Table 1
Ground Resistance (R)
Step Function
Working
Voltage
(V)
Positive
( )
Negative
( )
1
BAND1
0 600 5000
15