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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Hello I have monitor samsung Smatron 7Ei the fault is that the picture is very dull with less contrast and bright. CRT heater volgate is ok. Secondly there is a heavy noice when i start it by power...


after 4 or 5 yrs EHT ( transformer that supplies voltage to CRT TUBE - TV TUBE ) becomes weak - then 1 of the indication is ....picture becomes dull (less brightness & less contrast --- that noise is from EHT )........so solution is EHT ( also called as flyback transformer ) should be replaced....... {{ few details about EHT---- its size will be around 3inch X 2inch X 2inch ---it will have 2 or 3 knobs to adjust focus , brightness ------ at bottom around 10 pins will be there ------- from EHT 1 thick red colour cable goes to CRT TUBE --------- on EHT its part number will be there }} -------- so if user is a technical person having idea about components ( resistors, transistors, diodes, etc ) , having tools like multimeter ( to check components) , soldering iron, soldering lead, flux, desoldering wig ( for removing components), etc also little experience in servicing field( compulsory) ----------------- then user can remove EHT from main board ---- take to electronic shop ----- buy same type EHT --------- fix to mainboard ( knobs on EHT should be adjusted according to picture --- after switching monitor --- this adjustment is very important ) ----------iam from bangalore (09986222774, sathyavijayasarathibabu@ymail.com) ----- here EHT's price will be around Rs 250 ( US $ 6 ) & for my customers (in bangalore) i will take another Rs 500 (US $ 11) as sevice charge......i don't have any idea about EHT ' s price & service charge in your place.........since it is very risky job i suggest to contact monitor service engineer ------- because they are highly experienced & can fix this component very easily.....

Apr 18, 2011 | SAMTRON 55V 15" CRT Monitor

1 Answer

Disply very slow please help me


after 4 or 5 yrs EHT ( transformer that supplies voltage to CRT TUBE - MONITOR TUBE ) becomes weak - then 1 of the indication is ....it takes few mins for picture to appear...........so solution is EHT ( also called as flyback transformer ) should be replaced....... {{ few details about EHT---- its size will be around 3inch X 2inch X 2inch ---it will have 2 or 3 knobs to adjust focus , brightness ------ at bottom around 10 pins will be there ------- from EHT 1 thick red colour cable goes to CRT TUBE --------- on EHT its part number will be there }} -------- so if user is a technical person having idea about components ( resistors, transistors, diodes, etc ) , having tools like multimeter ( to check components) , soldering iron, soldering lead, flux, desoldering wig ( for removing components), etc also little experience in servicing field( compulsory) ----------------- then user can remove EHT from main board ---- take to electronic shop ----- buy same type EHT --------- fix to mainboard ( knobs on EHT should be adjusted according to picture --- after switching MONITOR ) ----------iam from bangalore (09986222774, sathyavijayasarathibabu@ymail.com) ----- here EHT's price will be around US $ 10 & for my customers (in bangalore) i will take another US $ 12 as sevice charge......i don't have any idea about EHT ' s price & service charge in your place.........since it is very risky job i suggest to contact MONITOR service engineer ------- because they are highly experienced & can fix this component very easily.....

Jan 17, 2011 | LG Flatron 775FT 17" CRT Monitor

1 Answer

Samsung sync master 753s crt monitor widh very low, EHT driver transister volt 78 .please tel the answer?


first of all check weather the width is getting varied from the front panel menu. if there is a vary in width but not full, then need to vary in factory level settings with the help of JIG software provided by Sansung with KIT. The KIT is connected between the CPU and the Monitor.

IF there is no change in width with the front menu, then chage the high voltage PF capacitors at Width section and EHT section(near output transistor (near LOT)).

Dec 10, 2010 | Samsung SyncMaster 753S 17" CRT Monitor

1 Answer

Microtek flatvision display horizontal continuous moving.


that is problem of diode near EHT that diode connected to big heat sink having three leads two series diodes in one diode replace it even meter shows ok .If persists then check mosfet irf 630 and path of its gate touch heat sink if it overheats then yoke is faulty replace it

Mar 17, 2010 | LG 500LC Monitor

2 Answers

LG STUDIOWORKS 500G monitor dead ?


your irf 630 is not original purchase it from proper LG authorised service centre it is costly but never become faulty again duplicate mosfet overheats if your green led is on then measure voltage at E.H.T.connect meter at output transister if E.H.T. is producing then meter should show 1 digit if not then 50v will show take care that signal cable should be disconnected if E.H.T. is not producing then check +vcc at horizontal ic it should be 12v. if 12v is not present then check regulator ic 7812 insmps

Mar 14, 2010 | LG 500LC Monitor

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

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

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

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