![background image](http://html.mh-extra.com/html/samsung/sgh-r225/sgh-r225_service-manual_1191008045.webp)
5-18
SGH-R225 Flow Chart of Troubleshooting and Circuit Diagrams
5-10 Back Light
Yes
END
Backlight does not work
Select backlight "ON" mode
Backlight "ON" mode
in the menu?
R575 = "H" ?
GPO1 by test S/W
No
Yes
Yes
No
Resolder R575,R579
or replace Q403
Q403 pin 3 = "L" ?
LCD backlight on ?
Replace LCD
No
Yes
No
LCD BACKLIGHT
KEY PCB LED
Resolder R575,R579
or resolder Q403
Q403 pin 3 = "L" ?
No
Yes
Yes
END
Key PCB LED on ?
Resolder
R745,R572,R746,R573
R747,R574,R748,R725
or Replace PBA
No