Haier 29T9D, Service Manual, Page: 41 / 73

41
1.2.7 KA7630 Secondary power integrated circuit
2 Electric circuit analyses
2.1 Super single chip integrated circuit TDA9384
As a super large-scale decoding and microprocessing integrated circuit, TDA9384 is comprised of a
microprocessor, picture image intermediate frequency amplification, sound intermediate frequency
amplification, line and field scanning, dwarf signal processing, color decoding, sound filtering and
auto identification, luminance separation, high voltage tracking and over voltage protection. It
functions for I
2
C bus-mastering and automatic adjustment for transmeridional correction and dark
balance.
Table 1 lists the pin function and test data of TDA9384 as the reference for maintenance.
The data is to be tested under the mode of 49.75MHz, PAL B/G and cylindrical color card muting,
using a model FLUKE 79
Ⅲ
instrument.
Table 1
Resistance to Ground
R
Pin Function
Working
voltage
（
V
）
Forward Test
（Ω）
Back Test
（Ω）
1. STANDBY 0 36K 29K
2. SCL 3.5 15K 15K
3. SDA 3.2 15K 15K
4. VT 3.0 20K 20K
5. KEY 3.4 36K 30K
6. SYSTEM 4.4 15K 15K
7. MUTE 5.1 15K 15K
8. GND.MAG 0 Infinity 2.9M
9. VSS C/P 0 0 0
10. BAND 3.3 14.5K 14K
11. BAND 0 14.5K 14K
12. VSSA 0 0 0
13. SEC.PLL 2.3 6.4M 4.3M
14. VP2 7.8 18K 18K
15. DECD/G 5.0 31.9K 32K
16. PH2.LF 2.9 6.4M 4.2M
17. PH1.LF 3.9 6.4M 4.2M
18. GND3 0 0 0
19. DEC.BG 4.0 39.8K 40K
20. EWD 0.7 63K 63K
21. V.DRB 2.4 6.0M 4.0M
22. V.BRA 2.4 6.0M 4.0M
23. IF.IN1 1.9 37.5K 38K
24. IF.IN2 1.9 37.5K 38K
25. I.REF 3.85 38.8K 38.8K
26. V.S.C. 3.8 6.3M 4.6M
27. TUNER.AGC 1.7 4.9K 4.9K
28. AU.DEEM 3.2 6.1M 3.6M
Circuit Explanation