Question about Zenith B25A02Z TV

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Bad solder connections on the vertical ic

How can i fix a solder connection

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Hi,

Cold solder is normally fix with re-application of heat using a soldering iron. This is a fairly straight forward job and should not be that difficult. Probably what would take more time is opening the back cover and exposing the solder side of the PCB. Most TV PCBs are slide in/out (it may held in place by screws or retaining clips or side locks. Additionally, some of the wires/connectors may restrict movement and therefore must be disconnected temporarily).

Good luck and kind regards.

Posted on Dec 08, 2007

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2 Answers

My tv all of a sudden has horizontal lines across the picture.


You have bad grounds on your vertical IC. And you have a bad capacitor or two. I don't recall the actual location of the vertical IC location. I would say it may be U4501 location. Resolder the seven pins of this IC. Now check capacitor locations C4505 which is a 35 volt 220 Mf value, and C4506 which is a 63 volt 330 Mf value.Replace these caps as necessary. Then check the solder grounds at the power supply chip U4101, this chip is a switch mode regulator and may become detached from the board. Resolder these 11 pins and be careful not to short the pins with too much solder. Please note the two pins on the right (separated by a missing pin) are soldered together, this is OK. Now for the biggest challenge. You must pull the bottom shield off the tuner (has the RF connection). Yes, this area can produce the horizontal lines you speak of. When removed, you will see about 15 bad solder connections. This area will require great skill to resolder. The solder on the perimeter of this tuner is very difficult to work with, and you do not want to burn off any traces connecting to out side feeds. You could destroy this board. Now inside the tuner area there will be 5 pins or grounds that will need resoldered. Be careful here and not to burn off the small traces leading to other connections. Replace the tuner shield after complete inspection and soldering. In some cases the eeprom, locationU3201, will need replaced. Might not in your case as you say you can still watch TV and the audio is good. I know this is a lot of information, but this TV can be saved. I have repaired many of these. Thanks for asking and show a few hands of support.

Mar 27, 2011 | GE 31GT660 TV

1 Answer

No video, sound is ok.


If you can take the board out of this TV, you will find many bad solder grounds. First places to look for, are the vertical IC and the horizontal transformer. Be sure to check the solder connections on the small board connected to the picture tube. Very common problem for any and all these tube type TVs. If the vertical IC has bad grounds it would be in your best interest to replace the capacitors near and next to this IC. In any case resolder any and all bad solder connections. Your picture will return in most cases. Thanks for asking and show a few hands of support.

Jan 24, 2011 | Sharp 32C-240 32" TV

1 Answer

The vertical hold keeps going out. Fixes itself for a short time and goes out again. The volume stays fine. When you turn off the tv and turn it back on the vertical hold goes out. Hopefully there...


you either have a bad vertical ic or just bad solder connection around the vertical ic and stage. When the TV is fine, if you slightly tap the set and the problem presents itself, then it is bad solder at the ic and stage.

Jan 15, 2011 | Televison & Video

2 Answers

Rolling lines until tv warms up


Vertical output IC bad capacitors in vertical circuit 100uf 35v sometimes vertical IC needs to be resolder and that fixes problem look for poor solder joint s.

Sep 27, 2009 | Mitsubishi VS-50605 50" Rear Projection...

2 Answers

My tv has a line threw the middle of it...the picture will come on but only if you move the tv.


Sounds like you may have a bad solder connection on the vertical ic, it is a small ic connected to a heat sink near the flyback. Usually a 5 pin ic, look on the solder side of the board for a solder connection with what looks like a ring around the pin.

Sep 02, 2009 | Sharp Televison & Video

3 Answers

I have a three year old model pvc2542 tv/vcr combo the picture is just a line in the center of the screen


Bad vertical deflection circuit, unless you have a bad connection (bang on set to set it it fills out for a second) . you will need components replaced such as the IC, capacitors possibly a fuse from the power source to the vertical IC.
If its a bad connection soldering the IC pins is not to hard if you are OK with taking it apart yourself.
gd lk
Eric

Aug 21, 2009 | Televison & Video

1 Answer

TV vertical field collpses. Toshiba Model CF2668B.


Very likely it has bad solder connections on the vertical output IC. Or the IC could be bad and needs to be replaced.

Feb 03, 2009 | Toshiba 53H71 53 in. Rear Projection...

1 Answer

Line across screen if i hite it it will work for a some time


If the line of which you speak is a horizontal line that looks like the picture collapsed, the problem is a vertical circuit problem. If hitting the set "fixes" it, then it is likely to be a bad solder connection. If you can solder, resolder the pins on the vertical IC. This is a small flat IC with about 11pins attached to a heat sink that may me marked LA7837 or something similar.

Let me know if that fails to resolve the problem.

Dan

Sep 26, 2008 | Toshiba 36A50 36" TV

2 Answers

No vertical sweep on my Sanyo DS31590


This is a fault in the vertical circuit. It can be either a bad solder connection of the vertical IC or a defective IC. If you can solder, you can fix this yourself. Open up the back and locate teh vertical IC. It willbe a small flat IC attached to a heat sink and be marked LA7841. Resolder the pins first. If that fails to resolve the problem, replace the IC. Please note that there may be capacitors in the circuit that need to be changes as well, but without the chip working, it will be difficult to determine which ones. Update this once the IC has been resoldered or replaced with the results and we'll continue if necessary.

Dan

Sep 25, 2008 | Sanyo DS31520 31" TV

1 Answer

TV video problem


Hi,
If you have intermittent line horizontally across both tv screens then there is likely to be bad solder connections on the vertical ic's of both of them. This can be fixed by taking the back off with quarter inch nut driver and carefully sliding the chassis out and turning it up to see the solder side. I don't know the location numbers but the vertical ic will be mounted on a metal heat sink and the connections will be in a row. Sometimes you can see the bad connections. You may need a magnifying glass. I recommend someone who has experience soldering electronic circuits. No solder bridges etc. This is for intermittent (works sometimes) problem on vertical ic. If the line stays then the chip ic is bad along with a 1 ohm resistor off the flyback high voltage transformer. From what you described you likely have bad connections. Hope this helps

Dec 30, 2007 | Televison & Video

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