Power System Troubleshooting; Normal Operation - Sony KLV-40ZX1M Training Manual

Power System Troubleshooting

Normal Operation

Reference Figure 2-1
110VAC is applied to the GS1-Board, and can be measured at CN6000.
In the standby mode the AC power passes through the main fuse F6001,
R6001 (Inrush resistor), and BD6001 and is applied to the Main DC/DC
Converter IC6501 and the Standby DC/DC Converter IC6200. IC6501
is not active in the standby mode. However, IC6200 is active in standby
mode and outputs STBY 3.3Vdc as long as AC power is applied to the
TV (and the GS1-Board). The Standby 3.3Vdc is supplied to the BE-
Microprocessor, H1L-Board (Power Key), and H4L-Board (IR Sensor) in
the standby mode.
Once an ON command is received form the remote controller or the power
button on the H1L-Board the BE-Microprocessor outputs the Power-ON
signal. The Power-On signal is applied to the GS1-Board. On the GS1-
Board the Power-On signal switches the 19V from the standby power
supply to activate the relay (RY6001), PFC, and Main Power supply. One
relay click is heard at power-on. The relay engages to bypass the inrush
resistor R6001 during the ON state.
The BE-Microprocessor also outputs additional Power.-On signals to
activate all the voltage regulators on the B-Board to complete the TV
power on sequence
The main power supply IC6501 is now active and outputting a single 12Vdc
secondary supply. This single 12Vdc secondary supplies the following
four sections in the TV.
• B-Board Audio Output Amplifier (AU12Vdc)
• B-Board Voltage Regulators (Reg 12Vdc)
• BT3-Board (Reg 12Vdc)
• LD1-Board (Reg 12Vdc)
The GS1-Board also supplies 390Vdc and 18Vdc to the LD1-Board (LED
Backlight Power Board). The 390Vdc supplies each converter high-power
output switching transistors, and the 18V is the VCC for each converter
CTV-54
IC on the LD1-Board.
Troubleshooting
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