Wiring Connection Diagram; Circuit Explanation - Haier HTR20-A Service Manual

5. WIRING CONNECTION DIAGRAM

6. Circuit Explanation

1、Microprocessor and Small signal processing: super monolithic integrated circuits ：
TMPA8873PSCNG
TMPA8873PSCNG is an integrated circuit decoder, containing intermediate image
amplifying, horizontal and vertical scan, small signal processing, color decoding,
2
I C bus control.
Information introducing functions and testing data for maintenance is listed in
Table 1.
Table 1
SYMBOL
DVD_OPEN
SWA
KEY
GND
RESET
X-TAL
X-TAL
TEST
+5V
GND
GND
KEY BOARD
PIN
Voltage (V)
1 0.8
2 0.04
3 4.94
4 0.004
5 4.92
6 2.17
7 2.01
8 0
9 4.94
10 0.003
11 0.003
Working Ground Resistance
36.4M
12.8K
19.4K
0.4Ω
5.5K
33.3M
32.7M
0.6Ω
2.8K
0.6Ω
0.7Ω
21
(Ω)