Read LG 32LH70 (CHASSIS:LA92D) Service Manual online
- 14 -
TROUBLESHOOTING
1. TV/CATV doesn’t display
2. DTV doesn’t display
Check the output data of IC100 in the Jack
Board Pin52.
Can you see the normal signal?
NO
Could you measure voltage of IC100 in the
Jack Board & IIC lines?
Are they all normal?
NO
You should check power line
& IIC lines.
YES
You should replace Jack Board.
YES
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.
Check the output of TR Q100, Q103
in the Jack Board.
Can you see the normal waveform?
YES
NO
You should decide to replace TR Q100, Q103
in the Jack Board or not.
Check IC100 in the Jack Board.
Can you see t he normal signal?
Check the output of TRQ102 in th e Jack
Board.
Can you see t he normal wavefo rm?
Check the output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and cloc k.
Can you see t he normal wavefo rm?
YES
YES
NO
Could you measu re voltag e of IC100 in the
Jack Bo ard & IIC lin es?
Are they all normal?
YES
NO
You sh ou ld check power line
& IIC li nes.
YES
You should rep lace Jack Board .
NO
You sh ou ld decide to rep lace
TR Q102 in the Jack Board or not.
NO
After checking th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r checking thoroughly all path once again,
You sh ou ld decid e to rep lace Main Bo ard or not.
Click on the first or last page to see other 32LH70 (CHASSIS:LA92D) service manuals if exist.