Member Avatar for captain_colt

hello guys, this is my first post..

i am using this lg 500g crt monitor. it runs smooth till last week. the computer starts as usual , num key blinks means windows is running normaly..monitor led green blinking very fast which is unusal.

on off not working when i tried to off it. screen is showing nothing..

please guys help me out on this...

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  • Latest Post Latest Post by JorgeM

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As reported by , the PC appears to boot (keyboard lights) while the LG 500g CRT shows a rapid green blink and no picture or on‑screen messages. Building on 's suggestion and 's note about repair cost, the quickest way to narrow the fault is to isolate whether the monitor itself can produce an image or whether the signal path/PC is at fault.

Recommended step-by-step checks:

  1. Confirm mains and power lead: swap the monitor power cord and try a different wall outlet or strip verified with another device.
  2. Isolate monitor vs PC: connect the LG to a different, known-good computer (or connect a known-good monitor to the original PC). Presence of the monitor OSD/menu on the other PC means the problem is the signal/cable/GPU; absence of any menu points at an internal monitor fault.
  3. Swap the video cable/adapter (use a known-good VGA cable if applicable) and ensure connectors and pins are intact and screwed in.
  4. Power-reset the monitor: disconnect mains and video, press and hold the monitor power button ~10–15 seconds to discharge controls, leave unplugged 10–30 minutes, then reconnect.
  5. Try the monitor front-panel menu/auto/degauss buttons and listen for clicks; on some CRTs a very faint raster can be seen with a strong flashlight if the beam is present but blanked.
  6. Note the exact blink pattern and model number for lookup — some vendors publish service/LED codes or a service manual.

Safety and next steps: do not open a CRT—high-voltage components can retain lethal charge. If the OSD never appears after isolation and resets, the fault is likely internal (power/standby board, capacitors, or HV circuitry). Given parts and labor for older CRTs, replacement is often more practical, as suggested.

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Member Avatar for rubberman

Assuming you checked all the cable connections between the PC and monitor, the problem may be a simple failure. See if you can get the monitor to bring up its internal configuration options/menu and such. If they display, then you know that the monitor's basic display functions are ok and that the likely issue is the interface.

Member Avatar for captain_colt

hello rubberman, the screen is all black..not showing no signal msg also i.e. no display but the led didn't turn red or any other color.. it blinks green and rapidly..

Member Avatar for JorgeM

it blinks green and rapidly..

You may want to check the vendor's website for documentation on this monitor if they have it available. Sometimes, these LEDs will blink in certain patterns that indicate what the problem is.

What I suspect is that the cost to repair the failure may not be worth it based upon the low cost of new monitors.

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