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How to read schematics to find the part number


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I'm having trouble identifying components from a Samsung TV Power Supply board.

Here is a picture of the schematic diagram's section.

As you can see:
1- Some components are identified in the diagram like the transistor KDS184.
2- Other components are marked on the component itself like the SMD resistors 4700 and 3002.
3- Another components (like 1 and 2) only have reference numbers (like QI801 and 2907 for the first) but are not identified with the part number on the schematic diagram neither on the item itself.

How can I find out the part number for these components?

Thank you in advance for any help.
Bill

inverter_section_3.jpg

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