OkThis question is lacking a whole lot of context. It is a lot like asking what size tires should I buy, without specifying what they will go on. Indeed the designations fall into the realm of schematic diagram component designations. So without more description of the circuit any answer will be an uninformed guess, at best, unless some participant happens to have a board the exact same type. Not very likely.
RightIn modern usage, 3R4 would a be a 3.4 Ω resistor. That is NOT what those number seem to represent on your board. Instead, they look like names/labels from a schematic. For example one IC is 3U5 and a diode is 8D3, neither of which is a value.
If the component is not labeled on itself (many resistors are), then your only recourse is to measure them out of circuit.
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