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Samung syncmaster591s brightness problem

I have replace LOT(eht)but same complants. abnormal brightness,how to memmory reseting,bright moving low high,did not dry soldering,

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To start with , its not a printer, its a monitor
secondly its not a lot its a l.o.p.t. or line output transformer.
thirdly setting brightness is done by varying the ht on the lopt itself -there should be 2 presets - 1 controls focus the second brightness

Posted on Nov 18, 2008

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Posted on Jan 02, 2017

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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

TEXTS ARE TOO BLURRED AND BRIGHT ,IRRITATING TO THE EYES


after 4 or 5 yrs EHT ( transformer that supplies voltage to CRT TUBE - MONITOR TUBE ) becomes weak - then 1 of the indication is ....picture becomes dull (less brightness & less contrast , blurness )........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( very much 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 04, 2011 | SAMTRON 55V 15" CRT Monitor

1 Answer

Over briteness and top botam both side cuting


open the monitor check eht rotate the preset on eht named screen brightness will be controlled
there is a three lead diode attached to heatsink near eht replace it even found ok problem of oversized display will be solved

Feb 07, 2011 | Samsung SyncMaster 753S 17" CRT Monitor

2 Answers

Brightness and contrast increases suddenly


Check following:
1- VGA chord; is it loose or faulty?
2- Power Supply section not regulating perfectly.
3- Supply line from SMPS/Regulator power supply to EHT.
4- Brightness lines and controls (Resitance may be dry soldered or burnt)
5-Pin connection on rounded board of CRT neck may be loosed, Check it if loose than fit properly.
6- Adjust the precet for accelearting and focusing anode externaly fixed with EHT if inbuilt in EHT than only solution is to replace the EHT only.

Feb 15, 2010 | LG Computers & Internet

1 Answer

Brightness


open the monitor you will look big black part called EHT you will see the movable shaft on it rotate it by screw driver in active supply monitor see on screen suficient brightness and stop you will be satisfied

Nov 21, 2008 | Hansol 500 A Monitor

1 Answer

Brightness Problem


Hi,

Since focus adjustment using the flyback rear controls (EHT) has no effect, then it could possible mean two things:
  • the EHT is defective (most likely) at least the controls; or
  • the picture tube is already weak.
A workaround is to replace the filter capacitor of the ~70V leading to the collector voltage of the 3 color drive transistor. Normally used to replace with is 100uF/160V.

Of course best would be to have the EHT checked/replaced.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 13, 2008 | Samsung SyncMaster 753S 17" CRT Monitor

1 Answer

Brightness


there is two transistors in brightness section near eht so you can check all small transistors around eht

Jun 24, 2008 | TTX Advantage Series -1770 (White) 17...

1 Answer

Monitor settings


You can increase brightness by eht .Move button of screen that is placed on eht
Hope this solution works

May 06, 2008 | Samsung SyncMaster 753S 17" CRT Monitor

1 Answer

Bright,thin line, in the middle of the screen, then...


1. I turn on the monitor, I hear a 'cracklin' sound
Reply: In a CRT Monitor there is a component called EHT which generates High voltage which is connected to the anode of the CRT, If there is any leakage due to moisture can cause this crackiling sound, You need to clean this high tension wire or replace the EHT ( CAUTION : BE AWARE OF HIGH VOLTAGES )

2. The screen only shows a bright, thin line.
Reply: The vertical Drive section of the monitor is faulty.

Dec 21, 2007 | Hitachi SuperScan Elite 802 21" CRT...

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