Without a schematic and test equipment you will have quite the challenge. Just like repairing a car, success depends on identifying the problem -- not throwing parts at it. In both cases you need diagnostic equipment to identify the problem and the skill set to know what to look for and interpret the results.
You may succeed, don't get me wrong, but you have to identify everything you replace and make sure direct substitution is given priority over "better quality". To avoid complicating things for you, practice desoldering on old pcb's until you get the pads clean as a whistle without damage.
Work slow, work deliberately. Plan ahead what should be removed first and take plenty of pictures of the board for assembly reference before you remove anything. Check and double check everything before you put the leads through the holes and check and triple check all diode and transistor orientations before soldering.
You may succeed, don't get me wrong, but you have to identify everything you replace and make sure direct substitution is given priority over "better quality". To avoid complicating things for you, practice desoldering on old pcb's until you get the pads clean as a whistle without damage.
Work slow, work deliberately. Plan ahead what should be removed first and take plenty of pictures of the board for assembly reference before you remove anything. Check and double check everything before you put the leads through the holes and check and triple check all diode and transistor orientations before soldering.