akira 21WHP3/BN, Service Manual

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25
Model No: 21WHS3-Bn
Version 1.0
Pin 36 EHT tracking /over voltage protection. If something is wrong, the anode high
voltage rise the heater voltage will rise too. When the rising voltage arrive some
limit, the V406 works, the voltage of pin 36 will exceed 3.9V. The OM8370 will
stop working.
Pin 37 PLL loop filter.
Pin 38 CVBS output. Monitor or RF videos can be selected.
Pin 39 +8V supply source
Pin 40 CVBS input
Pin 42 Y signal input
Pin 43 C signal input
Pin 44 Main audio output. This pin is connected to the TDA9859.
Pin 45 RGB signal input blanking.
Pin 46, Pin 47,
Pin 48 RGB signal input.
Pin 49 ABL. It means been current limiter input. R410 is the control resistor.
Pin 50 Black current input from the CRT board.
Pin 51, Pin 52,
Pin 53 RGB drive signal output to the CRT board.
Pin 54 +3.3V
Pin 55 GND
Pin 56 +3.3V
Pin 57, Pin 58,
Pin 59 12MHz crystal
Pin 60 Reset. NC in this chassis
Pin 61 +3.3V
Pin 62 NC
Pin 63 This pin is connected to the HEF4094. Functions expending.
Pin 64 IR signal input.