LG LST-4200A Service Manual - Page 27

System Part

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3. System Part START YES NO Is power source working normally? YES NO Is system clock working? YES Is each reset signal normally NO generated when charging power? YES Is the CS(chip selection) signal of NO flash parts normal? YES Is I2 C(SDA, SCL) channel normally NO working? YES Is it coming out the message through NO RS-232C, with PC terminal connected? YES END Refer to (A). Refer to (B). Refer to (C). Refer to (D). Refer to (E). Refer to (G). 3-18

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3-18
3. System Part
Is power source working normally?
START
Is system clock working?
Refer to (A).
NO
Refer to (B).
NO
YES
YES
Is each reset signal normally
generated when charging power?
Refer to (C).
NO
YES
Is the CS(chip selection) signal of
flash parts normal?
Refer to (D).
NO
YES
Is I2 C(SDA, SCL) channel normally
working?
Refer to (E).
NO
YES
Is it coming out the message through
RS-232C, with PC terminal connected?
Refer to (G).
NO
YES
END
YES