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Bad components what component in a building emergency or egress light causes it to turn on when the power goes out and how does it work?

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Depending on brand/age it may be a normally closed relay which would be open when the 110 line voltage is present and closed when the voltage drops out. connected in line between the battery and the bulb in the unit, when the power goes out the relay closes completing the circuit between the battery and the bulb and causing it to illiminate it.

Some newer more sophisticated models have electronic systems that provide essentially the same functionality

Posted on Jan 04, 2009


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Sony Bravia KDL-xbr4 Replaced TCON board All worked great for a week Had an issue w/ HDMI cable at the box fixed it and now tv comes and the goes off to 6 blinking red lights

6 red flashes- backlight issue, bad main board, or power board or inverter boards- check standby volts on power board. "backlight on" volts should be 3-5v from main logic board then 24v to inverter

Have this from a youtube link find BUT
Better is to look first also on bad leaking or bulged capacitors thats better to replace in the bad components to get a repair because active components died on bad capacitors but after a while because on the build-in protection circuit by faults like deformed or leaking capacitors and even several fuse resistors then after replace a complete board again after a while you will may be get the same kind of problems again, take If you find some or much bad capacitors replacements 10 volts dc higher . begin with control on the power supply first of all.

Sony Bravia TV kdl red blinking led light error codes solutions Sony KDL 40XBR4 KDL 40XBR5 KDL 46XBR4 KDL 46XBR5 Service Manual

Jan 05, 2017 | Sony Televison & Video

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I have a Gateway 310 XL H desk top PC. After the storm, Isaac, It won't power on. The red and green lights come on, the red goes off after a short time. The monitor flashes a manfacture logo then

The system is powered up if green light on, the hard disk is powered up if red-light on for a few seconds then goes off, but I assume it's not loading up after that. You have no output to video.

Try holding f2 or f4 to load default bios when turning on. If that doesnt work then That would point to me that there is a problem with either:

1) processor burnt out, or needs refitting following a knock to the case causing a bad connection.

2) ram burnt out or not correctly installed. Try refitting the ram or using a different combination of ram.

3. Bios chip burnt out. Sometimes you can literally see the chip is slightly melted.

4. Other motherboard fault, look for melted chip or damaged component.

5. Psu faulty or not connected properly. Check connections, or bench test with another psu.

Have you moved the pc recently? Sometimes dust builds up under processor or along ram, and when moving pc giving it a slight knock can cause bad connection. If dusty, remove clean and re install.

Hope it helps.

Sep 05, 2012 | Gateway 310 S PC Desktop

1 Answer

Have KD- XS955 50 inch. When turned on the green light flashes repeatidly untill it goes into standby. Fans do not turn on but the light panel does. The unit is a little dusty but not bad. Wondering how to...

Component problem. A defective component on the power supply circuit causes these symptoms ma'am/sir. You need an electronic servicing technician to do the work.

May 26, 2011 | Sony KDE-50XS955 50 in. Plasma HDTV

1 Answer

Turn dignals and hazard lights do not work

the turn signal awitch goes bad on those vehicles causing niether to work

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1 Answer

Ps3 powered up but wont activate

This sounds like the "Yellow Light of Death". Does the console power on, flash a yellow light then go back to red, while beeping three times?
This YLOD is caused by excessive heat inside the console. Typically dust builds up and causes the machine to overheat. This damages the internal components. The good news is that a skilled professional can fix your problem.

Jan 15, 2010 | Sony Playstation 3 (PS3) Console

1 Answer

Denon DVD 910 won't power up. Light goes off then on.

Possibly a power supply problem, not enough power.

Could be these:

- dried up filter capacitors (electrolytic) - these include: main filter capacitor (the biggest one),
any final filter capacitors at each voltage output section, also at the oscillator end.
Check for any blown up, leaked or (partially) shorted capacitors.

- burnt out components (resistors, diodes).
Replace these (assuming you can still determine the proper value or type).

- poor solder contacts.
Remove the old solder and resolder the pins.

Dried, leaked or blown up capacitors may cause the power supply to crash down (or cycle with very low power output).
Burnt out components may act as a short circuit line, a change in conductivity (resistance) or as an infinite resistance (open contacts).
Poor solder contacts (so called "cold contacts") originate from bad soldering (at the factory), being further loosened by component overheating and tensile stresses (moving your equipement from place to place causes the circuit board to bend a little bit each time, and this, in turn loosens the solder contacts even further, causeing more overheating which may melt the solder, and so on).
You can tell a poor solder contact from a good one: bad ones will have a circular crack in the solder around the pin - try moving the pin a bit with a pair of tweezers - if it moves, there's your bad contact (you'll need a good light source and possibly a magnifying lens to spot these).

hopefuly you can get closer to a solution using these hints.


3rq8 (Triarcuate)

Jul 14, 2009 | Denon DVD-910 DVD Player

2 Answers

My 2wire 1000Hw router keeps restarting

I have had three of these do the same thing. It is not the router causing the issue. It Is the power supply. I replaced mine with one from MPJA. It is a 4 Amp supply and I had to change the connector but total cost is $6.95 plus shipping on the power supply and $2.00 for the connector. Specifically inside the power supply is a 1000 uf cap that is bad and leaking. When the wifi and the DSL are both started the current is too high and the voltage drops causing the reset. Replacing the power supply fixed all three modems.

Jun 14, 2009 | 2wire (1000-400108-001) Router

1 Answer

My Envision 7100 Stop Working

These are all some component failure problem in the monitor circuits. This may have been caused by faulty components or overheating of the components causing intermittent or permanent failure of some components in the circuits.This causes the feedback circuits to sense incorrect voltages or currents in the circuits and turn on the protection circuit. It may also cause total failure of the power supply circuit and a loss of power to the monitor. These units should be returned to dealers for servicing. Hope this helps you .

Jan 09, 2009 | Envision EN-7100e 17" Flat Panel LCD...

1 Answer

Screen goes black and power light goes out after a few minutes

it would seem that one of the internal components has failed / overheated Dont open the rear of the monitor !

if pos drop it into your nearest pc repair shop and have is serviced it may just need cleaned to free it from dust build up
on the inner parts this may be causing the unit to over heat

Nov 04, 2007 | Gateway FPD1760 17" LCD Monitor

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