LG KE990 Service Manual - Page 120
Main LCD trouble
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4. TROUBLE SHOOTING 4.13 Main LCD trouble Main LCD control signals are generated by ESM6270. Those signal's path are: ESM6270 → Z ORAN (Multimedia Chip) → 40-pin connector(CN300 in Main PCB) → 40-pin connector (in LCD Module) START Press EN D key to turn the p ower on Is th e ci rcuit po wered? Yes Disconn ect and r econn ect 40-pin B to B conn ector No Follo w the P ower ON trouble shoo ting LCD di spl ay OK? No Check L CD_VDD_2.8V, LCD_RESET_N, LCD_DATA[ 0~15] in M ain BD No Chang e th e Main BD Yes Displ ay OK? No Chang e th e LCD modul e Yes Yes The LCD works End Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 121 - LGE Internal Use Only
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 121 -
4.13 Main LCD trouble
Main LCD control signals are generated by ESM6270. Those signal’s path are:
ESM6270
→
Z ORAN (Multimedia Chip)
→
40-pin connector(CN300 in Main PCB)
→
40-pin
connector (in LCD Module)
The LCD works
START
Press EN D key
to turn the p
ower on
Is the circuit powered?
Follow the Power ON
trouble shooting
LCD di spl ay OK?
Check L CD_VDD_2.8V, LCD_RESET_N,
LCD_DATA[0~15] in Main BD
No
Yes
Yes
No
Disconnect and reconnect
40-pin B to B connector
Change the Main BD
No
End
Yes
Display
OK?
Yes
Chang e th e LCD modul e
No