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Monitor bad focus. horizontal transistor blows

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This is definetly fault of EHT that big part in monitor replace it with original only duplicate or cheap may cause the problem adjust focuss control on EHT after fitting in on condition solder original transistor at h- output

Posted on Nov 23, 2008

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Pincushion distortion of LG 500G CRT monitor, which parts is responsable for this.


hi,
You have to check the pin control transistor in the horizontal section. It will be fitted on the same heatsik on which the horizontal output transistor is fitted.It will be a small transistor as compaired to the horizontal driver. Also you have to check the three mosfets in this section used to control the width.
ok

Jul 31, 2011 | LG Studioworks 563N 15" CRT Monitor

1 Answer

Screen horizondally pulled right side and screen rolled to left side


hi,
your monitors horizontal deflection side have some problem. you have to check the horizontal width cotrolling transistor mounded on the aluminum heatsik near the lot( line output transistor). also check the three mosfets which adjust the width for different resolutions. there are three such mosfets in the horizontal section.

fist of all replace the width controlling transistor in the heat sink. photo of mosfet and transistor is added for reference. not the exact number.
ok
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Jan 27, 2011 | AcerView 99C 19" CRT Monitor

1 Answer

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

Vertical n horizontal ic


Are you asking about this LCD Daewoo (F227B) monitor? LCD monitors do not use Vertical/Horizontal IC like the CRT type for the H/V Yoke.
What is the problem with the monitor?
Common problem with LCD monitor:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

May 19, 2010 | Daewoo F227B Monitor

1 Answer

INEED NO. OF OUTPUT HORIZONTAL LINE TRANSISTOR


If you mean 'flyback' or 'horizontal output transformer' and have the part number available, try one of the sources here:
Flyback links 
If you do not have the number you may have to search Viewsonic's website to loacte it.
Warning; the number of suppliers for CRT monitor parts is shrinking rapidly, my best supplier, ICM in California is long gone. 

Mar 31, 2009 | ViewSonic E70f 17" CRT Monitor

1 Answer

No display


test all HV mylar capacitor around the horizontal circuits.. usually .22 1600volts with color orange or blue..replace caps that value has changed..

Jan 23, 2009 | Compaq V700 17" CRT Monitor

1 Answer

No power


That ticking is from the power supply section of the monitor. It means there is a short circuit somewhere in the unit. Usually this is a part called the horizontal output transistor, which is mounted on a metal heat sink somewhere on the circuit board. It is possible to repair by replacing the transistor with the same part number (the number is on the transistor). Sometimes other parts are bad too, though, so the repair could be more difficult than that.

Nov 21, 2008 | Computer Monitors

1 Answer

Acer tft monitor al 1516a , fuse blows immedeatly


Check the horizontal output transistor. Its probably shorted.
Dan

May 23, 2008 | Computer Monitors

4 Answers

AOC 5En monitor


replace new moitor....

Nov 13, 2007 | AOC CT720G 17" CRT Monitor

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