Рет қаралды 52,119
LG TV14"NORMAL PCB
MAIN IC TDA11105PS/N3/3/AN4
EHT 6174V-6006N
VERTICAL IC LA78040
SOUND IC TDA7297SA
STR W6753
STANDBY
NO EHT
1.Power on/Check 9V regulator input voltage-----ok.
2.Check 9V regulator output voltage-----missing.
3.Check 3.3V regulator output voltage------ok.
4. Check 3.3V main ic pin No.33-------ok.
5. Check 3.3V main ic pin No.40-------ok
6. Check 3.3V main ic pin No.43-------ok
7.Check memory ic supply voltage----ok.
8.Check memory ic SCL voltage-----ok.
9.Check memory ic SDA voltage------missing.
10.Power off/Check register R69(3.3K)----(SCL supply)-----ok.
11.Check register R70(100 ohms)----(memory SCL supply)-----ok.
12.Check register R67(3.3K)----(SDA supply)-----ok.
13Check register R68(100 ohms)----(memory SDA supply)-----ok.
14.Open memory ic SCL SDA pin.
15.Power on/Again check memory ic supply -----ok.
16.Again check memory ic SCL supply----ok.
17.Again check memory ic SDA supply----missing.
18.Power off/Open SCL SDA pin from main ic.
19.Next open SCL SDA pin from tuner.
20 Power on/Check memory ic supply------ok.
21.Again check memory ic scl supply----ok.
22.Again check memory ic sda supply----low.
23.Cut the SDA line (memory ic to tuner).
24.Power on/Check memory ic supply---ok.
25.Check SCL SDA voltage-----ok.(memory ic).
26.Power off/Resolder SCL SDA lids memory ic and main ic.
27.Power on/Check memory supply----ok.
28.Again check SCL SDA voltage main ic & memory ic----ok.
29.Next discussion circuit diagram.
30.Then----