LGE Internal Use OnlyCopyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes - 16 -
3. AV 1/2 doesn’t display
Check JK200, JK20 1
Can you see th e normal waveform?
NO JK200, JK201 may h ave prob lem. Replace th is
Jack.
Check the ou tput o f Main IC(IC100).
Especially you sh ould ch eck
The H,V sync and c lock .
Can you see th e normal waveform?
YES
NO After chec king th e Power of Main IC(IC100) yo u
should decide to replace Main IC or not.
This board has big probl em because Main
IC(IC100) have some troubles.
After chec king thoroughly all path once again,
You should decid e to replace Main Board o r not.
YES
4. Component doesn’t display
Check JK304
Can you see th e normal waveform?
Check the in put of Compon ent Aud io
switch(IC405 in the Jack Bo ard ),
Can you see th e normal waveform?
Check the ou tput o f Compon ent Au dio
switch(IC405 in the Jack Bo ard ) ,
Can you see th e normal waveform?
YES
YES
YES
NO JK304
may have pro blem. Repl ace this Jack.
NO After chec king the Power o f compone nt A udio
switch, y ou should decide to replace component
Audio sw itch or not.
NO After chec king the Power o f compone nt A udio
switch y ou should decide to replace component
Audio sw itch or not.
Check the ou tput o f Main IC(IC100).
Especially you sh ould ch eck
The H,V sync and c lock .
Can you see th e normal waveform?
YES
NO After chec king th e Power of Main IC(IC100) you
should decide to replace Main IC or not.
This board has big probl em because Main
IC(IC100) have some troubles.
After chec king thoro ugh ly all pa th onc e agai n,
You should decid e to replace Main Board o r not.
Downloaded From TV-Manual.com Manuals