LG 50PJ340 Training Manual - Page 131
PJ350 Main Board Front Side Component Voltages, IC202, IC308, IC501, Q501
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50PJ350 Main Board (Front Side) Component Voltages IC202 7V (to IC405) Pin Regulator [1] Gnd [2] Gnd [3] Gnd [4] Gnd [5] 3.3V [6] 3.3V [7] Gnd [8] 3.3V IC308 1.3V_VDDC Pin Regulator Use scope: [1] Do not measure Pin 1: 1.4~1.7V P/P [2] Gnd [3] 5.04V Using DVM, set shuts off. [4] 6.07V [5] 4.99V [6] 1.28V [7] 1.28V [8] 4.27V Use scope: Pin 8: 600mV P/P Using DVM, set shuts off. Q401 Q402 Q403 Q404 Tuner CVBS Pin Buffer (Analog) [B] 1.19V [E] 1.86V [C] Gnd IF_P Buffer Pin (Digital) [B] 1.18V [E] 1.18V [C] Gnd Tuner SIF Pin Buffer (Digital) [B] 1.32V [E] 1.99V [C] Gnd IF_N Buffer Pin (Digital) [B] 1.32V [E] 1.99V [C] Gnd Q502 HDMI CEC Pin Buffer [1 B] Gnd [2 S] 3.18V [3 D] 3.29V [4 G] 3.3V D1 Reset Pin Speed Up [A1] Gnd [A] 0V [A2] Gnd D2 LED-R Pin Routing [A1] 0V [C] 0.13V [A2] 0.28V D501 D504 D505 B+ Routing Pin to IC502 [A1] 0V [A] 4.54V [A2] 5.0V B+ Routing Pin to IC504 [A1] 0V [A] 4.54V [A2] 5.0V B+ Routing Pin to IC503 [A1] 0V [A] 4.54V [A2] 5.0V 50PJ350 Main Board (Back Side) Component Voltages IC203 Winbond Serial Pin Flash [1] 0V [2] 3.30V [3] n/c [4] n/c [5] n/c [6] n/c [7] 0V [8] 3.3V [9] 0V [10] Gnd [11] n/c [12] n/c [13] n/c [14] n/c [15] 0V [16] 0V IC301 1.8V_MST Pin Regulator [1] 0.6V [2] 1.85V (Out) [3] 3.3V (In) IC302 3.3V_VST Pin Regulator [1] Gnd [2] 3.3V (Out) [3] 5.09V (In) IC303 IC304 3.3V_MST Pin Regulator [1] Gnd [2] 3.3V (Out) [3] 5.04V (In) 1.2V_DVDD Reg Pin Dig Ch Only [1] Gnd Only on [2] 1.2V (Out) with Dig [3] 3.3V (In) Channel IC501 HDCP Data Pin EEPROM [1] Gnd [2] Gnd [3] 3.3V [4] Gnd [5] 3.3V [6] 3.3V [7] 3.3V [8] 3.3V IC306 3.3V_TU Pin Regulator [1] Gnd [2] 3.3V (Out) [3] 4.97V (In) IC307 1.8V_TU Pin Regulator [1] Gnd [2] 1.8V (Out) [3] 3.3V (In) IC502 IC503, IC504 EDID Data Pin For HDMI [1] Gnd [2] Gnd [3] Gnd [4] Gnd [5] 4.52V [6] 4.52V [7] 3.33V [8] 4.53V IC602 RGB Pin EEPROM [1] Gnd [2] Gnd [3] Gnd [4] Gnd [5] 5.09V [6] 5.09V [7] 3.33V [8] 5.09V IC701 IC703 USB 5V Q301 Driver for 5V_MST Q702 Pin Limiter Pin Switch Q302 [1] 4.97V (In) [B] 0.6V [2] Gnd [C] 0V [3] 3.3V (Enable) [E] Gnd [4] 0V [5] 0V Q302 5V_MST D502 [6] 4.97V (Out) Pin Switch [G] 0V RS232 Tx/Rx [S] 5.09V Pin [D] 5.04V [1] 3.3V [2] 5.45V Q303 3.3V_PVSB Sw [3] 0V Pin Dig Ch Only [4] 0V [5] (-5.37V) [G] 0V Only on [S] 3.3V with Dig [6] (-5.4V) [D] 3.3V Channel [7] (-5.4V) [8] 0V Q304 Driver for 3.3V_PVSB [9] 3.3V Pin Switch Q303 [10] 3.3V [B] 0.64V Only on [11] n/c [12] n/c [C] 0V with Dig [E] Gnd Channel [13] 0V [14] 5.45V Q501, Q503 [15] Gnd Q504 Hot Swap [16] 3.3V (B+) Pin Switch for HDMI [B] 0V [C] 0V [E] Gnd RS232 Pin Tx Buffer [B] 0.6V [C] 0V [E] Gnd HDMI CEC Limiter Pin [A1] 0V [A2] 3.28V [C] 3.1V