42LH90 Main (Back Side) Component Voltages
IC103 Reset Gen IC1003 9V Reg IC3505 Reset Gen Q1001 Tuner Video
Pin Mstar IC100 Pin to IC1002 Pin for IC3502 Pin Buffer
[1] Gnd [1] 12V [1] 3.3V B 3.09V
[2] 0V [2] Gnd [2] Gnd C 0V
[3] 3.3V [3] 8.9V [3] 3.22V E 3.72V
For Tuner Voltage 5V
IC104 RGB (PC) Q105 PWR On Delay D102 Audio Mute
Pin EEPROM IC1200 RGB Pin Q2405 Pin Routing
[1] Gnd Pin EEPROM B 0V A1 0.047V
[2] Gnd [1] Gnd C 1.95V C 0.089V
[3] Gnd [2] Gnd E Gnd A2 0V
[4] Gnd [3] Gnd
[5] 3.22V [4] Gnd Q600 Audio Mute D500 Shunt for
[6] 3.22V [5] 4.82V Pin Switch Pin IC501
[7] 0V [6] 4.82V B 0.08V A1 3.25V
[8] 3.22V [7] 4.82V C 3.26V C 3.12V
[8] 4.82V E Gnd A2 0V
IC107 Power Det
Pin Gen IC1201 RS232 Q703 5V Switch D1223 5V Routing
[1] Gnd Pin Rx/Tx Pin Control Pin for IC1200
[2] 3.9V [1] 3.3V B 0.6V A1 0V
[3] 3.28V [2] 5.56V C 0.03V C 4.82V
[3] 0.02V E Gnd A2 5.11V
IC702 +3.3V_ST [4] 0.03V
+3.3V_AVDD_MPLL [5] 5.46V Q704 12V LVDS
Pin Regulator [6] 5.5V Pin Switch Control
[1] Gnd [7] 5.5V B 0.05V
[2] 3.29V [8] 0V C 0.65V
[3] 5.11V [9] 3.29V E Gnd
[10] 3.24V
IC703 +3.3V_ST [11] 0.02V Q705 12V LVDS
Pin Regulator [12] 3.29V Pin Switch
[1] 0V [13] 0V B 0.65V
[2] 1.8V [14] 5.5V C 0.0V
[3] 3.21V [15] Gnd E Gnd
[16] 3.29V
Q1000 Tuner SIF
IC800 SPI Flash IC1202 USB +5V Pin Buffer
Pin Pin Switch B 2.4V
[1] 0.12V [1] 4.95V C 0V
[2] 1.13V [2] Gnd E 3.85V
[3] 3.26V [3] 3.21V
[4] Gnd [4] 4.95V
[5] 0.06V [5] 0V
[6] 1.2V [6] 4.95V
[7] 3.27V
[8] 3.27V
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