Monitors

What the panel inside a monitor decides:

colour, blacks and how cleanly a fast picture moves. IPS is the all-rounder, with steady colour from any angle, which is why it rules design and office work. VA gives deeper blacks and sits inside most curved gaming monitors, but in dark, fast scenes it can leave a faint smear. OLED switches each pixel off for true black and reacts almost instantly, at the cost of a panel that can keep the ghost of a taskbar or a game’s HUD if it shows the same image for months. Shape matters too. An ultrawide puts two windows side by side with no seam down the middle, and a slim portable monitor powered over USB-C turns one of the laptops into a two-screen setup in a client’s office.

Resolution for the screen size, hertz for the machine behind it:

Full HD looks sharp on a 24-inch screen and soft on a 27-inch one, where QHD is the sensible step up. 4K earns its place for text and photo work, and it is what makes a Mac’s interface look crisp rather than slightly blurred. A high refresh rate only helps if something can feed it: a gaming PC needs a graphics card from computer components strong enough to push those frames, an office tower will never notice, and a PS5 or Xbox tops out well below what gaming monitors advertise, so for a console the HDMI port matters more than the hertz.

QHD gaming screens against OLED on price:

a 27-inch QHD gaming monitor costs around $250 to $300 new in Panama, while brand-name OLED gaming monitors of the same size can pass $1,000. That distance is what makes a second-hand OLED tempting, and also why it deserves the closest look: its value rests on the hours the panel has done and whether anything has burned in, and no photo shows either. Plain Full HD office screens are the opposite case: new ones are cheap enough that a used one fetches little, and most of its worth lies in a working stand and the right ports.

A used monitor left running for a good while:

that is how a failing power board gives itself away, because most monitors die there rather than in the panel. A screen that clicks off after a few minutes, flickers, buzzes, or shows a standby light and no picture has that fault. Fill the screen with plain red, green and blue to find dead pixels, and look for a dark, spidery blot that spreads when you press nearby: that is pressure damage from a knock. On an IPS panel in a dark room, a soft corner glow that shifts as you move your head is normal; a bright patch that stays put is backlight bleed. On an OLED, put up a flat grey screen and look for the outline of a taskbar or a health bar. The stand and the power adapter should travel with it: many LG and Samsung monitors run off a separate brick, and a generic one with the wrong voltage can finish the job.

Handing over a monitor with its sticker, stand and box:

photograph the label on the back, which gives the exact model and the month it was made, and add a shot of the screen switched on with the settings menu showing resolution and refresh rate. List the panel type, ports and cables, and mention any dead pixel, mark or burn-in plainly, with where it sits. For an OLED, say how it was used: a gaming screen with a changing picture ages differently from one that showed the same spreadsheet for years. Mention the original box and foam if you kept them. Then keep an HDMI and a USB-C cable on the table with the brick already plugged in, because what sells a monitor is the buyer’s own laptop showing its desktop at the advertised refresh rate, and with that ready a handover in San Miguelito takes minutes.