Question about Hyundai ImageQuest L90D 19" LCD Monitor

Open Question

I have the exact same problem.

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.

Posted by on


5 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Technician (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 298 Answers

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

  • 979 Answers

SOURCE: Hyundai L90D 19" LCD Black Screen and Clicking Noise

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

  • 83 Answers

SOURCE: Power supply has shut down

what system is it connected to laptop or desktop? if a laptop try using the Fn+ Monitor buttton 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

  • 111 Answers

SOURCE: No Power

its saying that there is no video signal coming from your pc...

Posted on Feb 17, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Breaker keeps tripping on generator when I turn on ac in travel trailer

4KW is marginal for HVAC compressor. Breakers get weak with time. Assuming th gen is running properly and the correct voltage is available. A HVAC unit can take 6 times the start current than it takes to run, so it is possible the inrush is too much

Sep 02, 2013 | Makita 9 Hp 4,300 Watt Portable Generator...

1 Answer

After I hook up the power inverter to the battery, the AC product does not operate and/or the red FAULT light comes on.

It would depend on what type of AC product you'r trying t operate. While your load maybe only 1,000 watts, the starting inrush current may be too much for your inverter. Try turning inverter on, and see if it powers up. Try pluggin in something very small. Another possibility is the 12V circuit you're plugging the unit into isn't large enough to carry the current, and the incoming voltage is dropping too low for the unit to operate. A 1000 watt inverter is too large to plug into your cigeratte lighter unless you're only operating a very small load. Usually they are connected right to the battery. If you do this be sure to fuse it there , and run large enough wire to the inverter. You should probably have about a #4-#6 copper wire for such a large inverter.

Jul 12, 2010 | Black & Decker 1000w Power Inverter

1 Answer

What is a soft start?

Recently, the growing market of portable electronic devices brings greater demands for power management integrated circuit (PMIC). Among different PMIC, DC-DC converter is important in regulating the power supply, due to its high efficiency, capacity of outputting current and small static current . However, an inrush current and overshoot voltage appears in the startup period of the DC-DC converter, which may causes damage to the whole system and the load. Thus, a so called soft-start function is adopted during the startup stage of the DC-DC converter, which smoothly conducts the output voltage and current in the inductor to the steady state.In a typical DC-DC converter, as in Fig.1 a Buck system, a negative feedback is applied to build a system that automatically adjusts the duty cycle to obtain a given output voltage maintaining steady under all conditions [2]. Usually the output voltage is measured with a factor of H. The sensed output signal Vfb is compared with a reference voltage Vref. The negative feedback loop makes the sensed voltage accurately follows Vref, so that a constant Vout achieved. Accordingly, Vref can be replaced by a ramp signal during soft-start, holding the output voltage to climb bit by bit. As the duty cycle is limited, an inrush current can also be suppressed. During soft-start stage, a ramp voltage VSS is generated from a capacitor charged by a current bias. The smaller one VSS is added to the feedback loop, compared with Vref by a comparator, until it reaches Vref. The drawback of this method is that the soft-start capacitor CSS is usually too large to be integrated on chip, which means additional pin and PCB area. Furthermore, voltage spike may still occur at the end of the soft-start, because two control signals Vref and VSS are put through at the same time by comparator, and compared to feedback voltage Vfb, To DO A SOFT-START First, a whole power up the system is enabled by signal ENA, a simple bias is initiated.The LDO (Low dropout regulator) works by this rough bias.When the LDO is stable, it outputs power supply to a precision bandgap. BG_ready signal will go high when the precision bandgap stably works. The bias of LDO will change from a simple one to a precision one, leading to a more precision LDO output. When the power up process is over, an LDO_ready signal is sent all over the chip, and the rest of the chip will work then. This whole process will guarantee a safe power environment to sensitive analog modules. This LDO_ready signal will also tells the state control module to change the stage form SD (shut down) mode to SS (soft start) mode. When the soft-start is accomplished, an SS_ok signal will switch the stage to NM (Nmoral operation) mode. Furthermore, the entire protection signal can be incorporated in the state module to boot different operation stage...hope this helps

Jul 01, 2010 | GE Electrical Supplies

1 Answer

Appears to have a signal but no internet

perhaps the router has had a power surge, this can happen when, the power is unexpectedly cut off, and then reconnected, the units, ON switch, is still ON, and there is a phenomenon, called "Inrush Current" this can and does wreck, power supplies and units. Turn OFF, and Unplug, wait for a couple of mins, Now reconnect and turn ON. If it works, great, If NOT then please try a "Reset" this will restore the "Factory" settings again, Now IF this "Fixes"it, OK. Then you will have to setup the Router as from new, as the reset, wipes ALL settings. If after doing all this iy still isn't working, then you need to get a replacement.
manual link above, shows how to reset and setup.

Apr 19, 2010 | SMC Barricade g SMC2804WBRP-G Wireless...

2 Answers

I have replaced the power supply on my Acer Aspire X1700 computer but the new power supply acts exactly like the old. When I plug it in and turn it on the "Power Supply On" voltage goes from 5 VDC to 0 VDC...

When you have this problem on this PC, do not replace the power supply or the motherboard until you have first tried pulling out the video card. When the video card fails it can cause the x1700 to not power up. Pull the video card and see if it will power up without it.

Mar 09, 2010 | Acer (56.04145.901) (5604145901) Power...

1 Answer

My 1998 Olds Bravada just shut down on me while i was driving down the road. My gauges started acting erratically and i just loss all power. I barely had time to get it off the road. I got it started and...

sounds like an electrical problem, check your alternator an battery tru a shop, if the gages go crazy is a sign of the computer trying to shut down componets because the lack of power or voltage

good luck!

Feb 01, 2010 | 1998 Oldsmobile Bravada

1 Answer

Taco timers and Surge Protectors

Do they run at the same time? The two items consume
a lot of power. Check the voltage when they are turned on. If the voltage is below 90 Volts. The power surge at your Taco is great. Then, the surge protector could not
handle the current inrush that's why it's blown off. You
must install a surge protector that can handle the Taco
current inrush.

Sep 06, 2009 | Plumbing

1 Answer

Got a cyber Shot H-10 says lens cap is on but it isn't?

Go into the setup menu and try to find an entry for "reset". If you find it, reset your camera.

Aug 14, 2009 | Cameras

1 Answer

I did the initialization as per the directions and the water was hot. When I make the coffee, the warmer button will not come on and the coffee is cold. I turned on the vacation button for 15 minutes...

Sounds like something is miswired from the factory. Note that the tank heater switch on most home brewer models also acts as the "master" power switch. If the tank heater switch is not on, the warmer switch will not work, either - this is normal. Under normal conditions, the tank heater (or vacation switch) should always remain on, except if you are leaving on vacation.

Apr 18, 2008 | Bunn NHB Coffee Maker

Not finding what you are looking for?
Hyundai ImageQuest L90D 19" LCD Monitor Logo

Related Topics:

49 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hyundai Computers & Internet Experts


Level 3 Expert

77499 Answers


Level 3 Expert

3107 Answers

Randy Schumann
Randy Schumann

Level 2 Expert

391 Answers

Are you a Hyundai Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides