LG 42PJ350 Training Manual page 130

42PJ350 Main Board (Front Side) Component Voltages
IC202 7V (to IC405) Q401
Pin Regulator
[1] Gnd
[2] Gnd
[3] Gnd
[4] Gnd
[5] 3.3V Q402
[6] 3.3V
[7] Gnd
[8] 3.3V
IC308 1.3V_VDDC
Pin Regulator Q403
Use scope:
[1] Do not measure
Pin 1: 1.4~1.7V P/P
Using DVM, set
[2] Gnd
shuts off.
[3] 5.04V
[4] 6.07V
[5] 4.99V
[6] 1.28V Q404
Use scope:
[7] 1.28V
Pin 8: 600mV P/P
[8] 4.27V
Using DVM, set
shuts off.
42PJ350 Main Board (Back Side) Component Voltages
IC203 Winbond Serial IC303
Pin Flash
[1] 0V
[2] 3.30V
[3] n/c
[4] n/c
[5] n/c IC304
[6] n/c
[7] 0V
[8] 3.3V
[9] 0V
[10] Gnd
[11] n/c IC306
[12] n/c
[13] n/c
[14] n/c
[15] 0V
[16] 0V
IC307
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)
Tuner CVBS Q502 HDMI CEC
Pin Buffer (Analog) Pin Buffer
[B] 1.19V [1 B] Gnd
[E] 1.86V [2 S] 3.18V
[C] Gnd [3 D] 3.29V
[4 G] 3.3V
IF_P Buffer
Pin (Digital) D1 Reset
[B] 1.18V Pin Speed Up
[E] 1.18V [A1] Gnd
[C] Gnd [A] 0V
[A2] Gnd
Tuner SIF
Pin Buffer (Digital) D2 LED-R
[B] 1.32V Pin Routing
[E] 1.99V [A1] 0V
[C] Gnd [C] 0.13V
[A2] 0.28V
IF_N Buffer
Pin (Digital)
[B] 1.32V
[E] 1.99V
[C] Gnd
3.3V_MST IC501 HDCP Data
Pin Regulator Pin EEPROM
[1] Gnd [1] Gnd
[2] 3.3V (Out) [2] Gnd
[3] 5.04V (In) [3] 3.3V
[4] Gnd
1.2V_DVDD Reg [5] 3.3V
Pin Dig Ch Only [6] 3.3V
[1] Gnd [7] 3.3V
Only on
[2] 1.2V (Out) [8] 3.3V
with Dig
[3] 3.3V (In) Channel
3.3V_TU IC502 IC503, IC504
Pin Regulator EDID Data
[1] Gnd Pin For HDMI
[2] 3.3V (Out) [1] Gnd
[3] 4.97V (In) [2] Gnd
[3] Gnd
1.8V_TU [4] Gnd
Pin Regulator [5] 4.52V
[1] Gnd [6] 4.52V
[2] 1.8V (Out) [7] 3.33V
[3] 3.3V (In) [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
D501 B+ Routing
Pin to IC502
[A1] 0V
[A] 4.54V
[A2] 5.0V
D504 B+ Routing
Pin to IC504
[A1] 0V
[A] 4.54V
[A2] 5.0V
D505 B+ Routing
Pin to IC503
[A1] 0V
[A] 4.54V
[A2] 5.0V
IC701 USB 5V Q301 Driver for 5V_MST
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
[6] 4.97V (Out) Pin Switch
[G] 0V
IC703 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 [G] 0V
Only on
[5] (-5.37V) [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 [C] 0V with Dig
Channel
[12] n/c [E] Gnd
[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
Q702 RS232
Pin Tx Buffer
[B] 0.6V
[C] 0V
[E] Gnd
D502 HDMI CEC Limiter
Pin
[A1] 0V
[A2] 3.28V
[C] 3.1V