LG B2050 Service Manual - Page 75
Earphone Trouble
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4 . TROUBLE SHOOTING 4.9 Earphone Trouble TEST POINT J200 U205 U200 U201 CIRCUIT DIAGRAM RADIO_SPK_R RADIO_SEL HEADSET_SPK_P 2V8_VEXT C227 10u R232 NA U205 NLAS4684MR2 1 V+ 10 NO2 2 NO1 9 COM2 3 COM1 8 IN2 4 IN1 7 NC2 5 NC1 6 GND R234 NA HEADSET_SPK_OUT_P RADIO_SPK_L HEADSET_SPK_OUT_N HEADSET_SPK_N 2V5_JACK 2V8_VEXT 2V8_VEXT 2V8_VEXT 2V5_JACK C207 10u U200 NCP563Q25T1 1 GND NC 4 2 Vin VOUT 3 C208 10u HEADSET_MIC_N C203 0.1u C204 NA R201 2.2K R205 R206 20K 20K C205 39p R204 C206 3.3K 33u R202 1M C200 39p U201 MAX9075EXK-T VIN- 4 5 VCC 1 VIN+ 3 GND OUT 2 R209 220K HEADSET JACK HOOK_DETECT HEADSET_SPK_OUT_P HEADSET_MIC_P JACK_DETECT HEADSET_SPK_OUT_N RADIO_ANT (1608) C212 10u R211 4.7 (1608) C215 10u R215 4.7 L200 2.2uH R212 R213 L201 4.7 0 2.2uH J200 C217 39p R216 1M C216 39p AVL5M02-200 AVL5M02-200 AVL5M02-200 C218 VA202 VA203 VA204 39p C219 10p L202 270nH 1608 4.7uH CLOSE TO HEADSET JACK - 74 -