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I need diagram syntax tv 21 low voltage vertical section

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Posted on Jan 02, 2017

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SOURCE: mitsubishi cs27403c tv problem

kindly...see first the flyback and adjust the screen if the horizontal line still there adjust the fucos....

Posted on Jan 08, 2008

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Benimur
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SOURCE: CRT TV vert section

Hi,

Vertical linearity is more of a DCV bias issue rather than feedback or AC coupling. Hence it would be more apt to suspect resistors rather than capacitors. Of course, it is also possible that the large IC that drives the Vertical output maybe at fault (least likely) but often would have trimpots for adjustment. Most current designs do away with trimpots and rely on self correcting (feedback loop) which is simply a resistor in the 100k range. In certain instances, it could be a thermistor or resistor or diode limiter attached to the yoke itself.

Best would be to use a service manual or at the very least a schematic diagram with voltage readings and compare actual on PCB against schematic.

If you could post back the make & model or preferably the chassis number of the TV, might be able to comment back known common vertical issues.

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.

Posted on Jun 06, 2008

  • 50 Answers

SOURCE: my sony tv model no. kv-ha21m80 is on standby mode & its LED is blinking four times that means it has some problem in vertical section.But when I tried to check voltages of its vertical IC AN5522

Disconnect Vertical supply and so that your Horizontal system run check all voltages before connecting vertical again ...should the protection come in again when vertical connected ...replace Vertical Ic and safety resistor in line

Posted on Apr 21, 2012

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1 Answer

Why I have a thin line across the screen in my TV model Panasonic TC 21. After replacing the vertical IC the horizontal line across the screen reduced to few inches and not as it was earlier. vertica


First, You should to replace by original part, then you should check the voltages on power supply, and check the voltage for vertical IC based on datasheet, also check the voltages on vertical section including yoke and last you should check the ESR capacitors on vertical section.

Oct 13, 2014 | Panasonic TC-21PM10RQ 21" TV

1 Answer

Low voltage tv


The problem is power supply section and try to fix a vertical section

Feb 04, 2013 | Matrix Televison & Video

1 Answer

TV MODEL :SANSUI HARD ROCK 21'' PROBLEM : TIME TO TIME ONE HORIZONTAL LINE COMING WITH BLACK SCREEN


Hi The problem of your teevision is what we called the vertical line problem.The problem is in the vertical section of the board.There are many of cause of that problem.First is either loose connection,the circuit at the vertical section have cold solder so its need to resolder using soldering iron.Second,it maybe no vertical supply,its better to check the 12 volts dc supply of vertical ic output.if thers no supply in the ic,there a open resistor near the flyback.try to replace.Third if theres no loose connection and have a voltage supply the problem is either leaked capacitor or deffective vertical ic output. Commonly in that problem is the loose connection,try to resolder the verical section.

Jul 12, 2011 | Sansui DTV2760 27" TV

1 Answer

My Panasonic TC-21Z88RBN doesn’t displays the total picture vertically ,when the picture is display it like not in the center of the screen sum of it is disappear in the bottom


Hello

Your TVs vertical output section has the fault. You just open your TV after disconnecting it from the AC mains wall socket, and locate the vertical output section. This section uses an Ic marked as part [IC 401] on the board and its number is LA7840. Just look for any loose soderings around its components legs, and the solderings at the IC legs, which has 7 of them. The IC stated above will be screwed onto a heatsink to radiate heat out of it when it works.
If all soldering point are fine, come towards the IC legs and measure the voltages at each leg. The voltages must be
pin 1= Ground
pin 2= 12.6
pin 3= 24.7
pin 4= 4.4
pin 5= 4.4
pin 6= 24v [vcc]
pin 7= 1.8
All voltages stated above are DC voltages with respect to ground. If any of this voltage is missing, find out the reason for that. If all of them are noted abnormal, IC may be defective, and replace it.
[vcc] stands for main input voltage to the IC.
If you need any more assistance, feel free to contact me through Fixya. Ok.

Dec 07, 2010 | Panasonic TC-21Z88R 21" TV

1 Answer

Hello, I have a student in our electronics class that has an Emerson EWF2702. Problem is the tv has sound but only a white line will show up on the screen when it's turned on. Can you provide a diagram...


Hello
A single white line across the screen denotes the absence of vertical sweep. Its vertical output section, or its vertical deflection coil section [integrated to deflection coin assembly fixed at the neck of picture tube] may got damaged. Deflection coil faults are very rare. You just look into vertical sweep output and its dirve section. Check for all voltages. Check its main supply voltage. The output voltage must be almost about the half of its supply voltage. Usually most of the modern telivisions uses an IC in this stage. Sometimes that Ic may be faulty. Check it also. Schematic diagram of Emerson is not available with us; and is ver difficult to get. If you wants any further assistance contact me. gopakumarg43@ymail.com.

Oct 18, 2010 | Emerson Televison & Video

1 Answer

Power is not turning on seems the cord entering the tv is loose and power is not even getting to the tv


check first if the ac voltage working up to power section of the unit. if not trace if the line need to replace.

Apr 13, 2010 | Syntax-Brillian Olevia 242TFHD 42 in. LCD...

1 Answer

CRT TV vert section


Hi,

Vertical linearity is more of a DCV bias issue rather than feedback or AC coupling. Hence it would be more apt to suspect resistors rather than capacitors. Of course, it is also possible that the large IC that drives the Vertical output maybe at fault (least likely) but often would have trimpots for adjustment. Most current designs do away with trimpots and rely on self correcting (feedback loop) which is simply a resistor in the 100k range. In certain instances, it could be a thermistor or resistor or diode limiter attached to the yoke itself.

Best would be to use a service manual or at the very least a schematic diagram with voltage readings and compare actual on PCB against schematic.

If you could post back the make & model or preferably the chassis number of the TV, might be able to comment back known common vertical issues.

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.

Jun 05, 2008 | Televison & Video

1 Answer

Sony tv there is sound but no picture only horizontal line


hi there, one horizontal line means a vertical section prob., check some resistor with low value and a defective diode, possible ic part is defective. do some test and check up. ty

Feb 25, 2008 | Sharp 27C-240 27" TV

2 Answers

Mitsubishi cs27403c tv problem


kindly...see first the flyback and adjust the screen if the horizontal line still there adjust the fucos....

Jan 08, 2008 | Mitsubishi CS-27405 TV

1 Answer

I see only horizontal line on TV Samsung CK-5339ZB


h/line is due to vertical section failure. 1 reduce brightness as you will get h/line due to vertical failure. 2 check v/section for loose contact or yoke connection. 3 check supply to vertical section. 4 check associated parts in v.section 5 at last check for vertical ic. resistor R410 CONNECTED TO high voltage transformator T444 is low value resistor. .5ohm to 10 ohm. it burnt again due to short cht in vertical mainly due to ic. hope this will help. as per schematic diagram go to www.serviceinfo.com

Oct 04, 2007 | Samsung TXN3271HF 32" TV

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