Samsung SGH-G400 Service Manual

Also see for SGH-G400: User manual Quick start guide

Samsung SGH-G400 Service Manual Manual pdf 36 page image

SAMSUNG Proprietary-Contents may change without notice9. Flow Chart of TroubleshootingThis Document can not be used without Samsung's authorization9-19-1. Power OnC412(VREG_MSME)=1.8V?C413(VREG_MSMP)=2.6V?C420(VREG_MSMA)=2.6V?C415(VREG_TCXO)=2.8V?YesCheck the initial operationYesNo Check the clock generation circuit(related to TCX100)Check for the clock at= 19.2MHzYesNoCheck the U400YesENDYesNoCheck the U401L401(VREG_MSMC)=1.2V?YesNoResolder OSC401Check the Clock atOSC401=32.768KHzYesNoCheck the U401 related to PS_HOLDU401 pin F10(PS_HOLD)= 2.6V?YesNoChange the Battery' Power On ' does not workCheck the Battery Voltageis more than 3.4V