Member Avatar for xorgate

I have an LCD monitor here that just stopped working the other day. Anytime you turn it on, it flashes a left to right gradiant of black to red, green, or blue. The power light also shows orange, so it doesn't seem to be getting a signal from the pc. I have tried several PCs, but to no avail. Does anyone know what would be wrong?

P.S. It's an Norcent LM730.

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Brief expert summary and next steps for the Norcent LM730 thread (adds to earlier posts by , and ).

The symptom set described — the monitor only ever shows a left-to-right color ramp and the power LED sits in standby — points away from the PC or video cable and toward internal electronics (power-supply board, T-CON/scaler or LVDS ribbon, sometimes the backlight/inverter). Since basic button/cable checks were already tried, focus on a few targeted diagnostics that avoid needless parts swaps.

Non-invasive checks (do these first)

  • With the monitor powered, shine a bright flashlight very close to the panel. If a faint image or the ramp is visible, the panel logic is driving pixels but the backlight/inverter or CCFL tubes are failing.
  • Power up with the video cable disconnected. Many LCDs run an internal self-test (color bars or ramps) when no input is present; note whether the pattern changes or persists.
  • Note whether the brief-on-then-off behavior (as reported) happens consistently — that pattern commonly indicates a supply that collapses under load.

If you open the case (safety first)

  • Unplug the monitor and wait several minutes before touching anything. Electrolytic capacitors can hold charge; if unsure, do not proceed.
  • Inspect the power board for bulging, leaking or domed electrolytic capacitors and for dark/burned components or cracked solder joints. Replace any bulging capacitors with good-quality, low-ESR equivalents of the same capacitance and equal or higher voltage rating. Typical values in these supplies often fall in the 470–1000 µF and 6.3–35 V ranges, but verify markings before replacing.
  • Check the LVDS ribbon and T-CON board connections (loose/oxidized connectors and cracked traces are common failure points). The brief-image-then-shut symptom often matches a failing PSU cap that sags once the panel is driven.

Cost and practical advice

  • If uncomfortable with mains electronics, take it to a shop. Replacing a small set of caps or the PSU board is often inexpensive; replacing the T-CON or the panel can be costly and may exceed buying a used/reconditioned monitor.
  • As suggested, a 1000 µF 16 V cap could be one suspect — look for a cluster of bad caps rather than a single part. Replace with reputable-brand electrolytics and re-test.

Recommended Answers

All 5 Replies

Member Avatar for bobbyraw

on the monitor there are a few buttons that you should be able to press. try those and see if you get any desktop display.

Member Avatar for xorgate

None at all.

Member Avatar for itdupuis

What brand of monitor is it? Have you checked to see if all cables are properly seated? Some manufacturers have a reset button located in a hidden area, this could be something else to check as well. Hit us back if you make any progress.....

Member Avatar for joytech22

if the cable is damaged, you will have to get a new one.

Not all damage can be seen because inside that big black wire is more wires.

inside of one of those wires might be a break.

Member Avatar for BILLMOL

I have norcent lm730 monitor
on start up it flashes on and straight off
if i attempt to turn it on even after the computer is fully booted the monitor just flashes on the sreen for only a few seconds
have tried another monitor and that works
think it is a capacitor in thpoew supply of the monitor the question is which one the 1000 mfd 16 volt or another
billmol

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