don't forget this is a CRT. it doesnt have 1080 lines of resolution...it has 480. it's going to look crap compared to a modern TV or LCD. it's also a CRT not a plasma display, it's not going to have eye scorching brightness. that's how you end up with screen burn in. it's not meant to be run super bright and high contrast. you kids and your high resolution displays have sullied your vision.
PLEASE NOTE:
the D9200 is a weirdly designed finiky little bastard of a monitor. when it works, it works great...but if stuff starts going sideways...it piles up in a hurry.
it uses multiple SEPERATE SMPS power systems (3 or 4 if i recall) to drive the various systems. if one system goes down, it starts taking out other stuff until half the components are blown out. none of the systems are interconnected to shut everything down in the event of a failure. trust me i've tried getting a 9200 going after some 1000uF caps blew out and the monitor continued to run...blowing out nearly everything. i must have threw 50 diodes,IC's transistors at this thing and had to abandon it after weeks of trying.
it's old. it needs caps. you don't HAVE to do them all, but basically all the high voltage electrolyitc caps (over 50v 1-220uf) and the low voltage larger caps (16V to 35 or 50v between 47uF and 2200uF) you can basically skip all the small under 47uf caps.
also keep an eye on it, if it start doing weird things shut it down and get some help.