Question about Hyundai ImageQuest L90D 19" LCD Monitor
This started after I was on vacation. Came home, tried to power up and it acts as if the inrush see too much voltage then it shuts off to protect itself, then it is low and tries to come on again. Just keeps retrying and led changes from amber to blue and back again.
Power Supply cheked out okay. It appears to be a monitoring circuit of some sort. I have not been able to dig any further yet.
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Posted on Jan 02, 2017
SOURCE: power issue
Sounds like the Power Supply is gone
or on the way out. This is caused by the Power Switch Transistor being
too loosely clamped to heatsink allowing it to become too hot, and go into what we call 'thermal runaway' (2-3sec) and it draws too much current and the PS powers off to protect itself... or one of
the capacitors responsible for filtering the recitified AC to pure DC (what electronics use) or frequency of oscillation of the switching supply (26-48Khz - ultrasonic) is
drying up and changing value. A good tech can fix either. Most likely
the big filter cap is bad, and AC (60hz) is getting thru and causing the transistor to switch erratically. This is a easy fix and the TRANSISTOR and CAP are $3.00 parts
Or the inverter in the LCD is biting the bullet. If you turn down the brightness, does it stay on or click on and off? THAT would be the inverter. Inverters take 5, 12 or 24v from the powersupply and run the itty-tiny pencil-sized florescent lamps that light up your screen. Lamps are $8.00 and inverters can be $50-80, but ebay has them for alot less
Hopes that helps
Posted on Apr 08, 2009
Hello sir, the click you hear usually comes from a relay, the little black/blue square thing on the power board, when the load of the power supply is normal the relay swith on the entire monitor. if it detects an imbalance load usually shorts on the monitor, it shut down the circuit. so check for shorted IC regulator or transistors/diodes. if you have schematic diagrams, you can test the resistance of every IC on the board by locating the VCC and ground pin. (easier said than done). you may need patience to do this. until you find the shorted part. the next step is to remove the part and find a replacement. Try also to check on the internet usually ebay for power board replacement for your TV. hope this helps. = )
Posted on Jul 31, 2009
SOURCE: Power supply has shut down
what system is it connected to laptop or desktop? if a laptop try using the Fn+ Monitor buttton ...it may be in a different mode .. if desktop try another monitor if it works then the issue is something else or if it still does not work then it could be a loose video card try reseating the Video card
Posted on Oct 06, 2009
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