LG 26LT670H (CHASSIS:LA2AE) Service Manual ▷ View online
- 21 -
Composite / RGB-PC Audio in Trouble Shooting guide
HDMI Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK1700, P800
Can you see the normal waveform?
Y
Check the input of Mstar(IC101).
Measure waveform at C236, C237, C244, C245 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace JK1700, P800
N
Check Audio AMP output
L503,L504,L505,L506
Replace L503,L504,L505,L506
N
Y
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK800, JK801, JK802
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace JK800, JK801, JK802
N
Check Audio AMP output
L503,L504,L505,L506
Replace L503,L504,L505,L506
N
Y
- 22 -
BLOCK DIAGRAM
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PW
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18
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JK
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Pro
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LG
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70
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- 23 -
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
30
0
20
0
51
0
50
0
12
0
53
0
81
0
52
1
LV
1
40
0
90
0
91
0
54
0
* S
et
+
S
ta
nd
* S
ta
nd
B
as
e
+
Bo
dy
A10
A2
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