Member Avatar for lenelson

I have a customer that has had two 19 inch Jetway LCD Monitors die in six months. I have used this monitor in other locations (some have multiple monitors) with no troubles. I have observed the line voltage and it can jump from 110 to 123 volts and back 20 times in one minute. Anyone know if this could be the culprit? I am getting no support from the power company or the supplier.
Lyle

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Follow-up for and . Repeated monitor failures in a single site are most often a power-quality issue or repeated stress to the monitor switching PSU. Rapid mains swings, transients, or a poor UPS output waveform increase ripple and heating in electrolytic capacitors and in switch-mode components, which shortens life. It is important to gather clean data before blaming a single cause. See Power quality and a short primer on UPS topologies and output waveforms at Uninterruptible power supply.

Practical, evidence-based steps:

  1. Log the mains with a true-RMS meter or a power-quality/data-logging meter for several days and save the files; logged faults make escalation to the utility credible.
  2. Temporarily substitute a high-quality UPS/line conditioner (online/double-conversion or a line-interactive unit that provides AVR and a pure-sine output) to see if failures stop.
  3. When a monitor fails, have the PSU board inspected for swollen/leaking electrolytic capacitors or heat damage; capacitor failure is a common end result of repeated stress (see Electrolytic capacitor).
  4. Reduce risk: move heavy loads off the same circuit, confirm grounding and wiring tightness, and keep serial numbers and failure photos for warranty claims.

These steps produce objective evidence and reduce guesswork. If log data points to the mains, present the data to the utility; if failures persist despite clean power, pursue manufacturer repair or capacitor replacement.

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Member Avatar for disophisis

You might try a UPS to help condition the power a little bit. Or perhaps a surge protection device (UPS might be favorable)

Member Avatar for lenelson

You might try a UPS to help condition the power a little bit. Or perhaps a surge protection device (UPS might be favorable)

they have a UPS, one of these cheap APC 1000 VA jobs, not a true UPS. After a week of turning of and sometimes coming back on, the Monitor is dead. The funny thing is, they work fine for a month or so before they go bad. A 17 inch CRT worked fine for a year.

Member Avatar for disophisis

So you're getting these voltage fluctuations out of a UPS? I'd say it's time to toss that thing in favor of just a regular power strip (surge protector) or a more expensive UPS. I think that much fluctuation in voltage in that short a time could definitely destroy electrical equipment

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