LG Electronics RT-21FA35R/RX/V/VX service manual Scl, Sda

NO Picture / No Sound

Is Any OSD displayed?

OK

Check IC11 pin71, 72, 73 (R, G, B out)

NO

OK

Check receiving system in MENU & execute Auto -Program .

Does the auto -Program

Operate properly

OK

Store on m anual- program MENU

OK

Check pin40(V out 1) 1Vp- p

NO

NO Check 1 . 8V, 3. 3V, NO 5V DC Voltage

NO

Check pin18

Reset Voltage

3.3V DC		OK
			NO
	Check pin57, 58
	SCL, SDA
3.3V DC		OK

RelaceIC11

Check SMPS Trans Secondary Voltage

Check IC13

(Reset IC)

Check IC12(EEPROM) & SCL, SDA Line

Go to

No Sound / Picture OK

Q501, Q503, Q504 (R, G, B out of IC11)

Check / Replace

CPT Board com ponent

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