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Has sound and high voltage,but no raster

Set has sound and high voltage but no raster

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That is the problem of eht if the sound is from eht then eht must be faulty replace it

Posted on Oct 28, 2008

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I have LG CRT monitor 17 inch .when i switch on my crt it start sparking sound but not actual spark . the sound was so iritating & sparking shows on screen but not inside the monitor. So what was the...


hi,
You have to replace the flyback transformer of your monitor. Its a high voltage stepup tansformer which provides necessory volteges for the picture tube like Anode voltage, screen voltage and focus voltage. After some years of use the insulation stength of the flyback transformer will become bad and the high voltage will try to discharge trough the nearest ground poit. At that time you will hear the sprking sound. Its because of the high voltage Anode volt is discharing to the ground it will reflect on the screen. Using the monitor in this condition will result in the failure of horizontal driver transistor and even the power supply. Replacing the flybalck will solve your problem.
ok

Aug 02, 2011 | LG Studioworks E700S 17" CRT Monitor

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Monitor no raster power has been ok


Hello,

The screen is blank with no raster at all. There are indications that the channel numbers are changing in the display. This indicates that some of the low voltages are present but these may be derived from the standby supply.
Assuming there is no deflection and no High Voltage, you either have a low voltage power supply problem, bad start up circuit, or bad horizontal output transistor (HOT) or other bad parts in the horizontal deflection.

Check for bad fuses.

(If you have High Voltage as indicated by static electricity on the front of the screen and you hear the high pitched whine of the horizontal deflection when it is turned on, then the following does not apply).

Use an ohmmeter to test the HOT for shorts. If it is bad, look for open fusable resistors or other fuses you did not catch.
Assuming it is good, measure the voltage on the collector-emitter of the HOT (this is safe if there is no deflection). You should see the B+ - probably between 100 and 150 V.
If there is no voltage, you have a low voltage power supply problem and/or you have not found all the bad/open parts.
If there is voltage and no deflection (no high pitched whine and no HIGH VOLTAGE), you probably have a start up problem - all TVs need some kind of circuit to kick start the horizontal deflection until the auxiliary power outputs of the flyback are available. Some Zeniths use a simple multivibrator for this - a couple of transistors. Others power the horizontal osc. IC from a special line-derived voltage. The multivibrator type are sometimes designed to fail if someone keeps turning the set on and off (like kids playing) since the power rating is inadequate.
Test the transistors if it is that type with an ohmmeter. If one is shorted, you have a problem. The usual way a TV service person would test for start up problems is to inject a signal to the base of the HOT of about 15.75 kHz. If the TV then starts and runs once this signal is removed, the diagnosis is confirmed. This is risky - you can blow things up if not careful (including yourself).

If you hear the high pitched whine of the deflection and/or feel some static on the scree, confirm that the horizontal deflection and high voltage are working by adjusting the SCREEN control (probably on the flyback). If you can get a raster then your problem is probably in the video or chroma circuits, not the deflection or high voltage.

hope this helps......

Aug 06, 2010 | SAMTRON 77V 17" CRT Monitor

1 Answer

MY MONITOR APPEARS FLASH WHITE LIGHT FOR A SECOND AFTER I SWITCH OFF THE SWITCH


there may b three major reasons behind..

1) a hallucination often created to eyes..
2) due to high voltage present, it keeps/holds the last raster for some time..time lasts till discharging..
3) this may b a case of crt detoriation..!!

always better to seek professional advise of ur system admin/vendor....

Jan 16, 2010 | Samsung Syncmaster 2033SW Monitor

1 Answer

Acer CRT moniter 17" Model: AC713 dost not display any thing.


Ok if you prese the menu button on the monitor does the monitors setting menu appear on screen
If it displays adjust the contrast and brightness until a picture appears
If that does not work place a fringe magnet on one of the corners of the monitor if there is now green tinge around it than there is no electrons being fired at the screen and you have missed something so test every component

Mar 14, 2009 | Acer AC713 17" CRT Monitor

1 Answer

Snowy Raster on display


Hi mcuyg,

Hope this will give you hint in solving this problem. Try configuring monitor settings in OSD mode; contrast; brightness; etc.. other special settings can be accessed using combination of buttons to minimize the raster intensity. On hardware side try resoldering cold soldered points and check the SMPS side.

Best regards,
Rosener Guyano

Jan 27, 2008 | Acer AL1716 17" LCD Monitor

1 Answer

Dell Ultrasharp 2005fpw


The problem you are describing is definitely a bad picture tube.please replace it or the problem you are describing sounds like high voltage regulation problems. The easiest way to tell is by changing from a black raster to a white raster. If the size changes quite noticeably or jumps alot then you have a regulation problem. The first thing to do is check your high voltage while changing the raster from black to white. If the HV varies by a large margin, then you have a flyback problem. If it doesn't, check the voltage at the collector of the HOT while varying the raster again. If the voltage changes alot then check your B+ line. Typically what goes out in this case is a capacitor(typically 100uf-350v or so) or the B+ regulator. Hope this helps.

Jan 26, 2008 | Dell UltraSharp 2005FPW 20.1" LCD Monitor

1 Answer

Sound from monitor speakers distorted and high-pitched


Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages.
Good Luck!

Jan 16, 2008 | Computer Monitors

1 Answer

Moniter problem


first thing it is not necessary to replace eht when there is no raster.

  • you please go as per procedure.
  • check output from power supply
  • if is ok check horizontal section
  • if it is ok or eht ok then check for heater glowing
  • check video output supply & print open
  • check g2 voltage on crt base.
  • check crt base for loose.
  • check for signal coming to video output ckt.
  • for ckt you can refer modern color monitor ckts volume 1&2.
  • available in india.
  • hope this will help.
  • good luck
  • be in contact with me unless it is rectified.

 

Oct 17, 2007 | LG Studioworks 700S 17" CRT Monitor

1 Answer

Horizontal setting is Out


Once you're ruled out your PC and video card by trying a different monitor, I would suspect the problem is a bad video / signal board inside the monitor. If so, it needs component-level electronic troubleshooting to locate the bad part(s).

Jan 10, 2007 | Microtech JTX V5 15" Flat Panel LCD...

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