LG 42LP860H (CHASSIS:LD33B) Service Manual ▷ View online
- 21 -
7. Analog RF Audio Trouble Shooting guide
Check RF cable & signal.
Check IC5400.
Check Audio AMP output L5402,
L5403, L5404, L5405.
Replace IC105.
Check TU6500 Pin6.
(SIF output)
Replace Tuner.
Replace L5402, L5403, L5404, L5405.
Replace IC5400.
Check C352.
(SIF signal to IC105)
N
N
N
Y
Y
Y
Y
Y
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8. AV / RGB-PC Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
This board has big problem because Main chip (MTK) have some troubles.
After checking thoroughly all path once again, You should decide to replace MTK or not.
Check JK4600
Can you see the normal waveform?
Check Audio AMP output L5402,
L5403, L5404, L5405.
Check AC cable for damage
For damage or open conductor
Check the input of MTK(IC105).
Measure waveform at C610, C611 because it’s more easy to check.
Can you see the normal waveform?
Replace JK4600.
Replace L5402, L5403, L5404,
L5405.
N
N
Y
Y
Y
Y
Y
- 23 -
9. HDMI Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
This board has big problem because Main chip (MTK) have some troubles.
After checking thoroughly all path once again, You should decide to replace MTK or not.
Check JK3301/JK3302/JK3303.
Can you see the normal waveform?
Check Audio AMP output L5402,
L5403, L5404, L5405.
Check AC cable for damage
For damage or open conductor.
Replace JK3301, JK3302,
JK3303.
Replace L5402, L5403, L5404,
L5405
N
N
Y
Y
Y
Y
- 24 -
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