Read LG 32LH7000 / 32LH7020 / 32LH7030 (CHASSIS:LD91D) Service Manual online
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1. TV/CATV doesn’t display
TROUBLESHOOTING
2. DTV doesn’t display
Check th e outp ut data o f IC104 in th e Jack
Bo ard Pin 52.
Can you see t he normal sign al?
NO
Could you measu re voltag e of IC104 in the
Jack Bo ard & IIC lin es?
Are they all normal?
NO
You sh ou ld ch eck p ower lin e
& IIC li nes.
YES
You sh ou ld rep lace Jack Bo ard .
YES
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
NO
After ch eckin g 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 c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace Main Bo ard or no t.
Check IC10 4.
Can you see t he normal signal?
Check the output of TRQ105 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 IC104 in the
Jack Bo ard & IIC lin es?
Are they all normal?
YES
NO
You shou ld check power line
& IIC lines.
YES
You should rep lace Jack Board .
NO
You sh ou ld decid e to rep lace
TR Q105 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.
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