Philips 30 inch and 32 inch LCD TV – Power supply Regulator board [SMPS] – Schematic

Main Supply (Block "D")
Diversity
Mains input voltage diversity (1308):
– EU: 198 - 264 V AC.
– US: 108 - 132 V AC (doublers).
– AP multi: 90 - 275 V
AC (auto doubler with AVS10 control IC and triac).
– China: 160 - 270 V AC.
Mains filter diversity:
– EU, China: 1 x mains filter + harmonic coil.
– US, AP: 2 x mains filter + inrush current resistor.
Screen size diversity:
– One module for 30" to 37" sets.
– Two (almost identical) modules on one PWB for 42" sets.

Specifications
• 12 V / 3 A on connector 1304 (for Ambient Light and to generate +8V6).
• 24 V / 5 A for LCD back-light on connector 1304 (for Sharp 12 V, 9 A).
• +18V, -18V sound on connector 1M02.
• +8V6 (derived from +12V from the Main Supply, switched "off" in Stand-by).
• Output voltage: over-voltage protection of resonant supply.
• Output current protection of resonant supply.
• Current protection at some safety fault conditions.

Stand-by mode
• The resonant supply is switched "off" via relay 1450 that is driven by the Stand-by Supply (via connector 1305).

Outputs
• 130-400 V
DC (full range) for Stand-by Supply (connector 1306).
• Mains over-voltage and safety protection for Stand-by Supply (connector 1307).

Inputs
• Relay drive voltage (for STAND-BY/ON mode) on connector 1305.
• DC_PROT signal to protect loudspeakers when there is a DC voltage across the loudspeakers (1M02).

Stand-by Supply (Block "E")
The Stand-by Supply is based upon the "Fly Back Converter" principle.