Question about Compaq V700 17" CRT Monitor

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No display there is a problem in the horizontal section of my monitor.the horizontal deflection transistor(c5552) was faulty, I replace it with a transistor of 15 ampere,1700 volt.When I tern on the circuit in a series board with 100 watt bulb a sparke on a point of kit and series bulb start blinking fastly, and after 3 seconds the bulb stops blinking and the kit returns back to its previous condition(the previous condition was of monitor was that when I turns on monitor it consume power and dont gives display and a contious sound of tik tik outs from kit) After that I check the replaced transistor, that transistor was ok.It means there is some other component is now become faulty.Note that I operate the monitor kit without connecting the picture tube after replacing the transistor. please help me. thanking you in anticipation.

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

Posted on Mar 09, 2009

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My crt acer ac512 monitar only centre line view,c"not full view why?


there are several reasons why picture of crt monitors did not display good picture. if your monitor had horizontal line at the center of the screen?...the faulty is in the vertical deflection, check the vertical oscillator also the fusible resistors & capacitors around that section. if there had vertical line at the center of the screen?..check the horizontal deflection, horizontal output transistor also check the YOKE.

Jul 31, 2014 | Acer Computer Monitors

1 Answer

My compaq monitor just start blinking and now only haft past of the screen is visible. the rest just went black with on bright shining line on the middle of the screen


hi,
Your monitor have problem with vertical deflection section. Can caused by the faulty vertical driver IC and faulty electrolytic capacitor it the vertical section or dry soldering in the pins of the vertical driver IC. When vertical section fails horizontal lines come on the screen. For testing the same you have to open the monitor and remove the main board. you can easily find out the vertical ic. just follow the four wire running from the deflection yoke ( coil on the crt neck) of which two will go to the horizontal section (normally red and blue wire) and two will go to the vertical section ( Normally yellow and green wire). Follow the yellow and green wire which will be connected to one of the socket in the main board. Follow the circuit track in the main board which will lead you to the vertical deflection section. There you can see one ic is fitted on a aluminium heat sink.Take a close watch in soldering of its leads. Dry soldiering can happen in its leads because its a component which will got to a temperature about 75 degree above at its normal working condition. if found any dry-soldering or not just resolder all the pins of that ic. then check the monitor. If problem remains then you have to relapse the ic.While replacing the ic try to relapse all the capacitors in that section. It will prevent from any further damage to the new vertical ic. if you need any more assistance feel free to contact me through fixya

Jun 09, 2011 | Compaq P 1220 22" 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

Horizontal screen size is too large all drivers are installed on winxp


This is Monitor Problem.you need an monitor service engineer.the problem is in Horizontal Deflection yoke/Horizontal output transistor section.

Nov 14, 2010 | LG Studioworks 563N 15" 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

No power into my crt monitor samsung


first disconnect the path of EHT then check voltages if present then open H o/p transistor check it if faulty then replace it if not then EHT is faulty replace it also check IRF630 mosfet if faulty replace it

Nov 04, 2008 | LG Studioworks 563N 15" CRT Monitor

6 Answers

Monitor problem


Hi,

Appreciate the "Ask Me".

I am assuming that you have more than just familiarity with electronic components and circuitry, the use of a DVM and a soldering iron. Further, that you have access to a service manual.

Width problem is basically insufficient horizontal deflection, then analysis would have to be in the horizontal section. Areas to initially focus on:
  1. 12V line and pin 29 of IC401;
  2. 110 V peak to peak at collector of Q403, if yes check Q 402 & 404 as well as T401;
  3. other components that affect the horizontal size are:
  • IC201
  • Q 405, 406, 407 & 408;
  • D409
  • L401
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 06, 2008 | Samsung SyncMaster 753S 17" CRT Monitor

1 Answer

Monitor horizontal adjust no function


It is the problem of horizantal section.Check horizantan hold transistor that is placed on hitsink of eht and two small transistors near iton pcb.and check horizantal yoke coil pins for dry soldring or low voltages.If thats are ok then change hori. &ver. deflection ic.
Hope this solution works.i am always for you

Mar 15, 2008 | Gateway FPD2275W LCD Monitor

5 Answers

Horizontal output transistor keeps failing


The horizontal output transitor is always connected to the primary winding of the flyback transformer (via collector) and also to the horizontal deflection coil via an electrolytic capacitor. The most likely suspect for damaging the transistor is the fylback transformer. In some countries there are electronic stores that test flyback transformer by winding a few turns on the ferrite core and applying a test voltage. This test will only test the secondary. The primary winding is difficult to test for turn to turn short because the resistance is quite low and you do not know the 'good' resistance.

May 15, 2007 | ViewSonic E70f 17" CRT Monitor

1 Answer

Dell monitor problem


Your monitor uses one transistor for High Voltage and one for Horizontal deflection. (Many use just one transistor for HV and Deflection). The transistor you removed is the deflection transistor.

Jan 29, 2007 | Dell 17" Monitor

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