Question about Panasonic CT-32SL14 32" TV

1 Answer

Panasonic CT-27D30B tv has a vertical problem, as soon as it is plugged in it powers up and has a thin horizontal line across the middle of the screen, I have replaced the vertical output ic (LA 7838) and the electrolytic caps. in the vertical circuit, I also resoldered most of the power supply and the ic's but still no change, also the set will not power off unless it is unplugged, suggestions are very welcome

Posted by on

  • 5 more comments 
  • refrigerant Jan 18, 2008

    thanks for the info. sedonix I will do these checks and post the results

  • refrigerant Jan 19, 2008

    hi sedonix, I made a mistake, the vertical ic is LA 7845N with 7 pins and not the LA 7838 as I had said, so could you tell me what are the voltage readings for this ic, thanks.

  • refrigerant Feb 01, 2008

    Sedonix are you still around, I am asking for the voltage values for the 7 pin vertical ic LA 7845N which is the one in this tv and not the 7838 as I previously said

  • refrigerant Feb 07, 2008

    hi, me again, still not able to solve the problem,I took some voltage readings on the vertical ic.The results were :

    pin 1 - GND.

    pin 2 - 25.3V

    pin 3 - 27.6V

    pin 4 - 0.2V

    pin 5 - 2.5V

    pin 6 - 28.3V

    pin 7 - 0.6V

    are these voltages correct

  • refrigerant Feb 07, 2008

    hi, me again, still not able to solve the problem,I took some voltage readings on the vertical ic.The results were :
    pin 1 - GND.
    pin 2 - 25.3V
    pin 3 - 27.6V
    pin 4 - 0.2V
    pin 5 - 2.5V
    pin 6 - 28.3V
    pin 7 - 0.6V
    are these voltages correct

  • refrigerant Feb 08, 2008

    thanks forthe info. sedonix,I did try some of the sites but the prices are way too high so I figured someone may have experienced this same problem and found the solution. Also I do not have a scope which I am sure would help the process as you said. I will still hope to find the solution though or the schematic.

  • refrigerant Feb 29, 2008

    I gave the TV to another technician and the problem turned out to be the flyback (TLF2AA002) and the vertical output ic (LA7845N), both were replaced and the TV is fine again.

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 579 Answers

Put a voltmeter on the vertical I.C .
pin 1 should be 12Vdc
pin 2 should be 24Vdc
from those two inputs, it should be generating at least 50V on pin 13.
If those are not present, trace the power back to its source in the flyback circuit, where a resistor or diode has blown.
If present, check its output on pin 12 and if there, trace through the vertical output circuit.
If not, it may not be getting a trigger pulse from the main video chip.
Hope Ya Fix It!

Posted on Jan 18, 2008

  • Greg Collins Feb 07, 2008

    Yes, it looks like the chip is getting power.

    Next step is to download the schematic from one of the sites that advertise here and actually trace down the signal.

    Would be good to have a scope of course.

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How do I get rid of vertical black bars on a plasma television


Fix Panasonic Plasma TV Vertical or Horizontal Bars ...

? 10:21
https://www.youtube.com/watch?v=CpWZTnAXbLg
Dec 30, 2013 - Uploaded by Pet Rock's Garage
This video covers how to fix a Panasonic 42" Plasma TV model TH-42PX600U that has vertical distorted ...

Horizontal black lines on Samsung 50" plasma tv - Forums - CNET ...

www.cnet.com > Forums > Samsung

CNETJun 11, 2015 - This past spring, a thin black horizontal line appeared across the screen, everything else is working fine. Next day ... In reply to: Horizontal black lineson Samsung 50" plasma tv .... I tried a white wash on the TV, but that didn't removethe line. Plasma TV has 3 thin black lines
Jun 11, 2015
Black Line across Samsung 50" Plasma has appeared?
Jun 11, 2015
Vertical black line on Sony PFM-50C1 Plasma Display
Jan 28, 2007
More results from www.cnet.com

Jan 05, 2016 | Samsung Televison & Video

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

Horizontal Band of Thin Red and Blue Lines on Screen


Sound like your Y-Sustain board has one foot in the grave. The Y upper buffer and Y lower buffer boards go when the Y Sus Goes too...

Mar 22, 2014 | Panasonic TCP46C2 46 in Plasma TV

1 Answer

Horizontal lines across TV screen Pansonic CT 35g25


Check its vertical output section circuit for any component damage or loose soldering terminals. Check the solder terminals of the vertical output IC. Resolder all the suspected solder terminals by applying al little more fresh solder, without making any solder bridge short in between adjacent solder terminals.
If this do not help you, replace the vertical output IC. Lose of Vertical Scan is the problem of your TV.

Aug 04, 2012 | Panasonic CT-35G25 TV

1 Answer

Our tv, a Panasonic # CT-36D11E/CT-36D11 only shows a horizontal thin line across the screen. The sound is fine - any ideas? Is it time to replace or could it be repaired cheaply?


Resolder the vertical IC and replace those capacitors near and next to your vertical IC. If the horizontal line still appears, you may have to replace the IC. Thanks for asking and be caredful!

Jun 18, 2010 | Panasonic CT-36D11 36" TV

1 Answer

Tv screen is black except for 1 horizontal line of color


The line is there because the vertical deflection unit - the one that spreads that line across the entire screen to form the image - has failed. Replacing it is a job for a professional, or at least an experienced amateur, and the parts will be quite difficult to find for such an old tv . 

May 28, 2010 | Panasonic CT-36DV60 36" TV

1 Answer

PANASONIC CT-27D30B


Maybe the vertical IC output are damaged you need to replace him

Sep 19, 2008 | Panasonic CT-27G14 27" TV

1 Answer

Panasonic CT27D30B


refrigerant, set is in vertical collapse which requires the replacement of the vertical output IC, probably going to need a tech for this one, questions? e-mail me, BMW Rider

Jan 14, 2008 | Panasonic CT-32SL14 32" TV

1 Answer

Panasonic CT-32D11 TV


Your vertical output IC has stopped working. This is usually caused by the solder joints cracking loose and the IC will either short out inside or just stop working. Sometimes a small capacitor next to the IC, called the pump-up cap, will go bad and cause the IC to fail. In any case, the vertical output IC should be resoldered or replaced and all circuits checked by someone experienced in repairing TV's.

Aug 05, 2007 | Panasonic CT-32D11 32" TV

1 Answer

Tv not working


this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!

Mar 08, 2007 | Sanyo DS31590 31" TV

Not finding what you are looking for?
Panasonic CT-32SL14 32" TV Logo

Related Topics:

143 people viewed this question

Ask a Question

Usually answered in minutes!

Top Panasonic Televison & Video Experts

 Grubhead
Grubhead

Level 3 Expert

5554 Answers

Demonic-2011
Demonic-2011

Level 3 Expert

509 Answers

The Knight
The Knight

Level 3 Expert

75846 Answers

Are you a Panasonic Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...