LG LPC-M155X Service Manual page 14

• LCD CIRCUIT
Is CD function selection proper?
Yes
Dose display LCD then light?
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Only for training and service purposes
No
Check LCD supply power
in the power circuitry.
Yes
Is IC1 reset circuit
normal?
VDD 0V
Reset 0V
Yes
Is IC1 pin27, 28 normal (osc)?
0.125usec
Yes
IC1 pin59, 60, 61, 62,
output wareform normal?
3.3V
Yes
- 3-3 -
No
• Supply circuitry defective
No • Supply circuitry defective
3.3V
• IC1 surrounding
circuit defective
3.3V
No
• X1 defective
No
• Pattern defective
• LCD light defective
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