Question about Gateway FPD2275W LCD Monitor

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EX700f no raster

EHT is low @ 1.8KV

can you point me in the right direction please ?

Thanks

David Anslow

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  • 56 Answers

There are 2 coil in EST in your monitor. Choose the big one and bind a Covered (burnished) copper were Clockwise/ anti clockwise.

Posted on Feb 10, 2008

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Posted on Jan 02, 2017

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White Raster with thin lines; Sound Ok.


White raster with retrace lines: No picture, Sound OK
(picture tube based telivisions.)

It is a common fault to occur in most of the CRT based telvisions, regardless of which brand it is. There will be sound OK, and a bright screen with thin white horizontal lines across; at about an inch space, all over the screen area. This fault may occur along with colur shades also, like blue screen with white retrace line, red screen with white retrace lines, green screen with white retrace lines. Let us take the first case. A white raster with white thin retrace line acorss the screen. These are call vertcial retrace lines technically. To make it mor understand, we have to go to some picture tube electrode details. There are three colour cathodes for a colour picture tube, Red, Blue and Green. Two girds are there called Focus and Screen. Focus grid is supplied with focus voltage which in turn determine the cocus of picture, and screen grid is supplied with screen volrage which determine the emission of the picture tube; in short. There is a final anode to all the picture tubes, which supplied with Extra High Tension voltage, can be located at the top side of the picture tube, to which the EHT voltage from LOT is connected with the help of rubber ****** and clip. Without these three voltages, EHT, Screen and Fcous, no raster will be produced. Therefore in our case, there is a raster, so, horizontal output section including Line Output Transformer [LOT] is functioning well, and as far as sound is there, tuner and video IF section are working well. In fact, all other section except, video output section is working properly.
There are three cathode points on the base card, marked as Bk, Rk and Gk. Check the voltages of these three cathodes. In our case, it will be very low or approximately equal to zero. When cathode voltages goes low, emission of the CRT increases, is the reason. There must be a voltage between 120 and 135VDC at these points. Find out the reason for this voltage drop is the next step. The video drive voltages in most TVs comes from LOT windings, after rectification and filtering. There will be one reisitor of low value, say one Ohms or so, will be connected series with this winding, in between diode and winding. Check the voltage at the cathode of this rectifier diode first. If found low replace the diode and the smoothin capcitor. The smoothing capacitor will be between 33 and 47MFD 250VDC rating. Replace both of them. If there is volatge, say 200VDC or so, check whether this voltage comes to the CRT base board or not, If not, check the conducting wire, serial resistors; if used for open. There is no chance of transistor shortage at this time as the raster we see is white. If raser we see have a specific colour predominent, that is green, blue or red, check the revalent video out transistors and replace it. It is best to replace all the three video output transisors at the same time with same batch and number.

on Apr 18, 2011 | Televison & Video

2 Answers

EHT + SUPPLY IS (55 OR 60 VOLTAGE) LOW VOLTAGE,MICRO POSER VOLTAGE IS NORMAL ON /OFF VOLTAGE NO ,RESET VOLTAGE NO , N O RASTER WHY


EHT should be 22 - 25KV
Power supply should supply 130Volts not 55!
Check power supply feedback loop and poor contact pre set.

Jan 06, 2011 | Hitachi C1478FN 14" TV

1 Answer

Dell 23'' TV/Monitor has stripe of raster in screen, just to the left of center. Comes and goes, sometimes it's just wavy, sometimes it's completely black.


Check main power supply DC capacitor.If this becomes dry this wiil fault could be due to intermittent contact of the EHT at picture tube body. Other possible fa Remove and reconnect the EHT cable at picture tube end. Before attempting switch off T V. Remove all electrical plug connections. Wait for few minutes for the EHT to discharge. Ease the suction cup that is hugging the picture tube body. By keeping the circular flaps folded by finger try removing the folded pin clip that is on the glass body. Clean and re position the clip. Attach back the suction clip.

Take care high voltage present at picture tube even the TV is OFF and plugs removed.

Jul 06, 2010 | Televison & Video

1 Answer

No picture


sound like crt erea ,eht ,mains problem.could possibly be crt failour.

Jul 30, 2009 | LG 50PX5D 50 in. Plasma HDTV

1 Answer

Has sound and high voltage,but no raster


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

Oct 28, 2008 | Computers & Internet

5 Answers

Help for TCL Brand of tv


I WANT THE SERVICE MODE CODE FOR MODEL NO: DP21E101 TCL TV 21"

Jun 15, 2008 | LG 30FS1D TV

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

2 Answers

No raster no audio,Zenith SJ 2065S5


as horizontal transistor gets very hot so no eht so no raster &no sound due to nosupply to vif & tuner. as hor output is getting hot please isolate supply to hor. section & check power supply output is ok as due to high voltage h/outout may get hot & demaged. if supply is ok check for leaky or short parts in hor output. 1 hor. output transistor itself if it is replaced that may not be of proper matching. 2 diode& cap.in eht section. 3 clean print near eht. 4 moisture near yoke due to rain in rainy season only. so keep it hot for few hours. 5 at last if all are ok eht or fly back transformer. re connect power to hor output after rectification

Sep 18, 2007 | Televison & Video

1 Answer

Faulty TV


check the ABL at the flyback. sould be at least 185+ volts on the G2 at the crt socket

Sep 04, 2006 | Panasonic CT-36D32 36" TV

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