LG OM7550 Service Manual

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3. CONNECTORS 4. ZENER DIODES
Location No. Voltage
ZD901 33V
ZD902 (TVS) 13V
ZD904, ZD905, ZD906, ZD907, ZD909, ZD911 16V
ZD908 22V
ZD915 10V
ZD920,ZD921 27V
Pin No. Pin Name Spec [%] Range [%]
Input
Voltage
Margin [%]
Output
Voltage
Margin [%]
SMPS <-> MAIN CN901 (SMPS) CN106 (MAIN)
5 -5V -5 ±10% -4.98 -0.4% -4.96 -0.8%
7,8 +5.6V 5.6 ±10% 5.63 0.5% 5.64 0.7%
11 14VA 14 ±10% 12.86 -8.1% 12.68 -9.4%
12 12V 12 ±10% 11.91 -0.7% 11.84 -1.3%
14 -B (-PVDD) -66 ±10% -66 0.0% -66.1 0.2%
15 GATE -54 ±10% -54.11 0.2% -54.13 0.2%
SMPS <-> MAIN CN902 (SMPS) CN110 (MAIN)
1,2 +B (+PVDD) 66 ±10% 65.81 -0.3% 65.81 -0.3%
5,6 -B (-PVDD) -66 ±10% -66.08 0.1% -66.08 0.1%
FRONT <-> MAIN CNA305 (FRONT) CN605(MAIN)
7 FL- -25 ±10% -24.46 -2.2% -24.46 -2.2%
14 VKK -27 ±10% -26.99 -0.0% -26.99 -0.0%
15 FL+ -22 ±10% -22.22 1.0% -22.22 1.0%
16 3.3V 3.3 ±10% 3.37 2.1% 3.35 1.5%
MAIN <-> TOP(USB) CN502 (MAIN) CNA203(TOP)
2,3 5.6VA 5.6 ±10% 5.64 0.7% 5.64 0.7%
MAIN <-> BT Module CN504 (MAIN) BT Module
10 3.3VA 3.3 ±10% 3.329 0.9% 3.329 0.9%
MAIN <-> Pick-up(MD) CN400(MAIN) MD
8 DVCC_5V 5 ±10% 5.01 0.2% 5.01 0.2%
MAIN <-> FAN Module CN604 (MAIN) FAN Module
4 12V 12 ±10% 11.98 -0.2% 11.98 -0.2%
FRONT <-> MAIN CNA304 (FRONT) CN201(MAIN)
6 3.3V 3.3 ±10% 3.244 -1.7% 3.244 -1.7%
TOP <-> VFD CNA206 (TOP) CN3E14(VFD)
1 VKK -27 ±10% -26.98 -0.1% -26.98 -0.1%
2 FL+ -22 ±10% -22.21 1.0% -22.21 1.0%
3 FL- -25 ±10% -24.45 -2.2% -24.45 -2.2%
10 3.3VA 3.3 ±10% 3.245 -1.7% 3.245 -1.7%
FRONT <-> TOP CNA302 (FRONT) CNA204(TOP)
1 VKK -27 ±10% -26.98 -0.1% -26.98 -0.1%
2 FL+ -22 ±10% -22.21 1.0% -22.21 1.0%
3 FL- -25 ±10% -24.45 -2.2% -24.45 -2.2%
10 3.3VA 3.3 ±10% 3.245 -1.7% 3.245 -1.7%
FRONT <-> TOP CNA303 (FRONT) CNA205(TOP)
9 KEY2 3.3 ±10% 3.253 -1.4% 3.253 -1.4%
11 KEY3 3.3 ±10% 3.253 -1.4% 3.253 -1.4%
12 KEY1 3.3 ±10% 3.253 -1.4% 3.253 -1.4%

LG OM7550 Specifications

General

Brand	LG
Model	OM7550
Category	Stereo System
Language	English