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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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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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.

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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.

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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

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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.

 

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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

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1 Answer

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

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