LG Electronics 32LM640S/640T-ZA Standard Repair Process Detail Technical Manual, All Models

Standard Repair Process Detail Technical Manual

	Error	C. Audio error_No audio/Normal video	Established	2010. 12 .14
LCD TV	symptom
			date
	Content	Voltage and speaker checking method	Revised		A25
		when there is no audio	date

<ALL MODELS>

②

②1

3

5

7

9

11

13

15

17

19

21

23

24 Pin (Power Board ↔ Main Board)

SMAW200-H24S (YEONHO)

Power on	2	20V (24V)
20V (24V)	4	20V (24V)
GND	6	GND
GND	8	GND
3.5V	10	3.5V
3.5V	12	3.5V
GND	14	GND
GND	16	GND
12V	18	Inverter On/off
12V	20	Lamp : A-Dim
		LED : N.C
12V	22	PWM Dim #1
GND/P_DIM2	24	Error-out

①

③

Checking order when there is no audio

①Check the contact condition of or 24V connector of Main Board

②Measure the 24V input voltage supplied from Power Board

(If there is no input voltage, remove and check the connector)

③Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal, the speaker is normal.

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