Lcd; Audio Part ( Earpiece, Hands-Free Earphone, Microphone, Hands-Free Mic ) - Pantech G510 Service Manual

G510 Service Manual
6.1.4 LCD Backlight Not in Operation(White)
1. Check to see if J103.13 pin is around 2.8V(duty:80%, 256Hz) : CP113
NO Check J103 and resoldering

6.2 Audio Part ( Earpiece, Hands-free Earphone, Microphone, Hands-free Mic )

6.2.1 No receiving tone heard( Ear-piece )
1.Check to see if U102 Nos. F10.A9 and J8(C118.C119.C120) is 2.55V_A : CP118
2.Check to see if U102 No. A7(C124) is around 1.2V : CP119
Set to HP8922M to connect a call and then set to 1Khz.
3.Check U102 No. K8 and K7(C147,C148)pins(Ear Signal) for wave form : CP120
NO Replace U102.
4.Check Earpiece No. Audio1 and Audio2(C198.1,C199.1) pin for wave form : CP121
NO Replace Earpiece.
CP113
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PANTECH
CP110
CP113
R&D CONFIDENTIAL