Question about Samsung SyncMaster 753S 17" CRT Monitor

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Thanks for help

I think i have got what you want to say. i was wondering if i can do this job of replacing the parts around the deflecting circuit myself or should take it to a technician.i am also thinking about getting a new monitor and dumping this all together. whats your take?

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Hi again,

Of course I'd go for broke, I'm a tech. Anything and everything could be repaired, there is just a "but" always somewhere.

If you are to consider the repair cost if you would avail the service of a tech, purchase of parts (if readily available), downtime, then economics and logic would dictate purchase of a new one;

If you are basing on a DIYers challenge, then it would be repair as long as possible. I used to have a Hitachi 21 inch that I have to increase the heater voltage so as to compensate for out of focus problem. I only stopped using it when the wife cleaned the yellow casing (used to be white) and spilled cleaning fluid inside.

Posted on Jul 20, 2008

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1 Answer

On screen horazantal white line


May not be an easy fix:

A single horizontal line means that you have lost vertical deflection. High voltage is most likely fine since there is something on the screen.

This could be due to:


Dirty service switch contacts. There is often a small switch located inside on the main board or perhaps accessible from the back. This is used during setup to set the color background levels. (On some sets, this is located on the CRT neck board and may be a jumper plug or other means of selecting service mode - not an actual switch.)
When moved to the 'service' position, it kills vertical deflection and video to the CRT. If the switch somehow changed position or got dirty or corroded contacts, you will have this symptom. Flip the switch back and forth a couple of times. If there is some change, then replace, clean, resolder, or even bypass it as appropriate.


Bad connection to deflection yoke or other parts in vertical output circuit. Bad connections are common in TVs and monitors. Check around the pins of large components like transformers, power transistors and resistors, or connectors for hairline cracks in the solder. Reseat internal connectors. Check particularly around the connector to the deflection yoke on the CRT.

Bad vertical deflection IC or transistor. You will probably need the service manual for this and the following. However, if the vertical deflection is done with an IC, the ECG Semiconductor Master Substitution guide may have its pinout which may be enough to test it with a scope.

Other bad parts in vertical deflection circuit though there are not that many parts that would kill the deflection entirely.

Loss of power to vertical deflection circuits. Check for blown fusable resistors/fuses and bad connections.

Loss of vertical oscillator or vertical drive signals.
The most likely possibilities are in the deflection output stage or bad connections to the yoke

May 27, 2014 | Samsung Televison & Video

1 Answer

Sony XBR 40" tube tv.


Failure of the vertical deflection module/circuit. The tv will have to be opened, the vertical deflection circuit found and replaced.
Definitely a job for a pro - the circuit is going to be extremely difficult to extract. The repair will cost you about $200: $20 for a new circuit and $90 per hour for the 2 hour job.

Sep 03, 2011 | Sony BRAVIA KDL-40S2000 40 in. LCD HDTV

1 Answer

Vertical line


Hello,

Most probably the vertical deflection amplifier is failing. The most common part that fails is the vertical output transistor.
The set is too old to find documentation on part numbers and descriptions. Probably the part is no longer available and you will need the assistance of someone who can help you find an equivalent transistor that will do the job.
Of course, without testing we cannot be certain the failure is the output transistor. It could be from something else such as the voltage regulator that feeds the dc line to the vertical section. Could be the vertical synchronous level that goes too low to trigger the vertical sweep generator.

Other bad parts in vertical deflection circuit though there are not that many parts that would kill the deflection entirely.

Loss of power to vertical deflection circuits. Check for blown fusable resistors/fuses and bad connections.

Loss of vertical oscillator or vertical drive signals
Good luck.

Jun 01, 2010 | Sony BRAVIA KDL-52W4100 52 in. LCD HDTV

1 Answer

Thin white horizontal line across otherwise black screen


Hello,

CAUTION: To prevent damage to the CRT phosphors, immediately turn down the brightness so the line is just barely visible. If the user controls do not have enough range, you will have to locate and adjust the master brightness or screen/G2 pots.

A single horizontal line means that you have lost vertical deflection. High voltage is most likely fine since there is something on the screen.

This could be due to:

Dirty service switch contacts. There is often a small switch located inside on the main board or perhaps accessible from the back. This is used during setup to set the color background levels. (On some sets, this is located on the CRT neck board and may be a jumper plug or other means of selecting service mode - not an actual switch.)

When moved to the 'service' position, it kills vertical deflection and video to the CRT. If the switch somehow changed position or got dirty or corroded contacts, you will have this symptom. Flip the switch back and forth a couple of times. If there is some change, then replace, clean, resolder, or even bypass it as appropriate.

Bad connection to deflection yoke or other parts in vertical output circuit. Bad connections are common in TVs and monitors. Check around the pins of large components like transformers, power transistors and resistors, or connectors for hairline cracks in the solder. Reseat internal connectors. Check particularly around the connector to the deflection yoke on the CRT.

Bad vertical deflection IC or transistor. You will probably need the service manual for this and the following. However, if the vertical deflection is done with an IC, the ECG Semiconductor Master Substitution guide may have its pinout which may be enough to test it with a scope.

Other bad parts in vertical deflection circuit though there are not that many parts that would kill the deflection entirely.

Loss of power to vertical deflection circuits. Check for blown fusable resistors/fuses and bad connections.

Loss of vertical oscillator or vertical drive signals.

The most likely possibilities are in the deflection output stage or bad connections to the yoke.
Hope it works well...

May 28, 2010 | Akai CFTD2083 20 in. TV/VCR/DVD Combo

1 Answer

When I power on my Mitsubishi CS-35313 tv, I only get a thin horizontal line across the center of the picture tube. What could be the problem?


There is a failure in the vertical deflection circuit. Typically there is a vertical output i.c. that provides the deflection vertically. The i.c. itself is a fairly common component to fail. There are some lower power circuits that feed this output device that also could be the problem. When the electron beam in the tube is not deflected vertically it "writes" only horizontally across the center of the screen thus resulting in a single trace. Be careful not to leave this at high brightness for any extended time as it can "burn in" that area of the screen. Unless you are a "techi" this is a job for a qualified technician. Troubleshooting would be in the vertical deflection section of the set. Most of the parts are not expensive in themselves, except for the deflection yoke which sits around the neck of the tube. The cost to repair would typically be the shop labor.

Nov 25, 2009 | Televison & Video

1 Answer

I have a problem in the vertical deflection circuit on my rca tv model#p61960 chassis#ptk195y06t can you tell me where i can find a replacment board


The deflection board is part of the Main board and is not available---you do have an option---contact PTS Electronics--get a quote from them----they repair/rebuild all kinds of circuit boards---This set was made around 2002 and it is not unusual that boards are not available for it any more---someone in the chat should have known this and told you.

Let me know if you have questions or need any help.

SD TECH

Oct 03, 2009 | Televison & Video

2 Answers

H line problem


I think you are describing 'no vertical deflection.' If all you have on the screen is a single horizontal line, the vertical deflection circuit (or IC) has died. Unless you have service documentation on hand, I can't give a part number to replace but this is typically not an expensive failure and if the set was OK before, it is worth having repaired.

Jul 05, 2009 | Sansui 27" TV

2 Answers

Problem when getting High Voltage on Hitachi 65SWX20B


Why should you spend 800$ when the tech told you 350. And yes, do what he said to you. 350 is a good price for what involve this repair. If you want to replace by yourself the 2 boards...remember the eeprom is on the signal board and you have to redo all geometry and convergence adjustments. Even for an experienced tech this is a 3 hours job and you have to be very good.

Nov 08, 2008 | Televison & Video

1 Answer

Convergence problem?


There are two IC's in this set that need to be replaced. If you can solder and unsolder on printed circuit boards, this repair should not be that difficult to do. If you have no experience with soldering, you should seek the help of a professional. YES, the IC's for the convergence is available but to have a pro do this job will cost you about 275 to 400 bucks. Good luck with this repair.

Jan 22, 2008 | Mitsubishi VS-50605 50" Rear Projection...

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