![background image](http://html.mh-extra.com/html/samsung/sgh-a800/sgh-a800_service-manual_1190308031.webp)
5-3
Flow chart of Troubleshooting and Circuit Diagram
5-2 Initial
Initial Failure
Check and repair the important
signals of U400 as follows
END
No
U302 pin 6 = "H" ?
The node
between R407 and C411
= "H" (RST)
No
Check U106
R411 = "H"
(SIMPWDN_BOOT)
No
Resolder R411
Yes
R423 = "H"
(GPIO4_MSIZE)
No
Resolder R423
Yes
R421 = "L"
(GPIO2_EXTPROC)
No
Resolder R421
Yes
Replace PBA
Check all the other connection
by Test S/W
Check the circuit around LCD
Yes
Summary of Contents for SGH-A800
Page 2: ...Samsung Electronics Co Ltd Printed in Korea 11 2002 Rev 1 0 GH68 03108A ELECTRONICS ...
Page 12: ...1 10 Exploded Views and Parts List 1 10 Battery Charger BATTERY CHARGER GH44 00279A ...
Page 25: ...4 1 Block Diagrams 4 Block Diagrams 4 1 Main Base Band ...
Page 26: ...Block Diagrams 4 2 4 2 Main RF ...