LG TCH-600 TROUBLESHOOTING

- 2-6 -

❏ ELECTRICAL TROUBLESHOOTING GUIDE

Any Key power on.

Is power turnd on?

DISC loading?

Does initial reading occur?

Can disc be played?

Is audio output supplied?

Check power supply circuitry.

Q808, Q809, Q802, IC401,

PIN13

Check loading supply circuitry.

Q505, Q506, Q507, IC401, CN505

Check laser circuitry.

Q501, IC501, IC503, IC504

Check focusing circuitry.

IC501, IC503

Check DISC.

Check tracking servo circuitry.

IC501, IC503

Check audio circuitry.

IC501, IC401, IC601, IC801

OK

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

(1) No Power.

- 2-7 -

YES

YES

YES

YES

YES

YES

(2) LCD light abnornal.

Any Key power on.

(without DISC)

Do display LCD then light?

Check voltage in the power

supply circuitry.

Power supply circuitry

defective.

Q802, Q807, Q808, Q809

Reset circuit defective.

Q803,Q804 Surrounding

circuit defective.

X401, C410, C411 defective.

Q807, CN802 front PCB

pattern defective.

IC401, Pin45~48 front PCB

pattern defective.

IC901, Surrounding circuit

PCB pattern defective.

Is u-com IC401 reset circuit

normal? Pin53

Is u-com IC401 keyin Pin17, 18

5volt input?

Is u-com IC401 Pin45, Pin48

output waveform normal?

Is IC901 Com1, Com2, Com3

output waveform normal?

Display LCD connector defective.

Is u-com IC401X1, X2 terminal

pin 57.58 input?

OSC : 7.2MHz

NO

NO

NO

NO

NO

NO

NO