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1、Case1．S888－/S888ESDproblemimprovementForS888-V00,therearesomeESDproblemsasfollow,1.Themobilewilllosecommunicationandsearchnetworkagainwhendischargingtoarrowkeyanddatakeyatair>6KVincommunicationstate,2.Themobilewilllosecommunicationandsearchnetworkagainwhendischargingtosidekeyandcameradecorati
2、onringatair>5KVincommunicationstatewithmobiledownwards,3.Themobilewillpowerofforlostnetworkwhenreleasingstaticfromtheheadsetspeakeratair>5KVinmobilewithheadsetstate.4.ThePAwilldestroywhendischargingtothecameradecorationringatair>5KV.Fortheseproblems,thesolutionsareasfollow,Problem1improvement
3、:MakethemetaldomeandMMIGNDwellconnectedwithtwopoints,andkeeptheresistancebetweenmetaldomeandtheGNDunder2ohm,Afterimprovement,itisOKforESDatair10KVonthearrowkeyanddatakey.Problem2improvement:(1)ScratchtheNBSCANtestpointwhichisjustunderthemetaldome.(2)Adda10nfcapacitorontheNBSCANtestpoint.(3)Ch
4、angetheformersparsemetaldomewithdensemetaldome.Afterimprovement,itisOKforESDatair10KVonthepositionofsidekeyandcameradecorationring.Problem3improvement:(1)AddTVSESDAVLC6V1-1M2ontheHSGND,itisOKforESDatair10KV.(2)Add10nfcapacitorontheHSGND,itisOKforESDatair10KV.Afterimprovement,itisOKforESDatair
5、10KVwhenreleasingstaticfromtheheadsetspeaker.Problem4improvement:UseisolatedtapetocovertheantennawhichisnearthegapofthecameradecorationringAfterimprovement,itisOKforESDatair10KVwhendischargingtothecameradecorationring.1.1.KEYPADPROBLEMuDescriptionWhendischargingtoarrowkeyanddatakeyatair>6KVin
6、communicationstate,themobilewilllosecommunicationandsearchnetworkagain.uProblemanalysisAtfirstthemetaldomeisconnectedwiththeGNDbyonepointandtheresistancebetweenthemetaldomeandtheGNDisbiggerthan2ohm,whendischargingtoarrowkeyanddatakeyatair7KVincommunicationstatus,themobilewilllosenetworkandsea
7、rchnetworkagain.OnlyonepointformetaldometoconnectwithGND,theresistancebetweenmetaldomeandGNDisbiggerthan2ohmuImprovementWhenkeeptheresistancebetweenmetaldomeandtheGNDunder2ohm,itwillnotlosenetworkagainatair10KV,soitisadvisedtokeepthemetaldome
