Read LG 19LS4D (CHASSIS:LD83A) Service Manual online
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3. AV 1/2/3 doesn’t display
Check J600,J601,JK607,JK618
Can you see the normal waveform?
Check the input of Video switch(IC700).
Can you see the normal waveform?
YES
NO
J600,J601 or SIDE AV may have problem.
Replace this Jack or SIDE AV.
NO
After checking the Power of AV switch you should
decide to replace AV switch or not.
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
NO
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
This board has big problem because Main IC(IC100)
have some troubles.
After checking thoroughly all path once again, You
should decide to replace Main Board or not.
YES
4. Component doesn’t display
Check J701.
Can you see the normal waveform?
Check the input of Component Audio
switch(IC1001) ,
Can you see the normal waveform?
Check the output of Component Audio
switch(IC1001) ,
Can you see the normal waveform?
YES
YES
YES
NO
J701
may have problem. Replace this Jack.
NO
After checking the Power of component Audio switch,
you should decide to replace component Audio switch
or not.
NO
After checking the Power of component Audio switch
you should decide to replace component Audio switch
you should decide to replace component Audio switch
or not.
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
NO
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
This board has big problem because Main IC(IC100)
have some troubles.
After checking thoroughly all path once again, You
should decide to replace Main Board or not.
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