Welcome, Guest. Please login or register.
November 24, 2024, 02:37:50 AM

Login with username, password and session length
* Home Help Arcade Login Register
.
+  Forum
|-+  Monitor Repair Log and Database. **Arcade and Gaming**
| |-+  Monitor Repair Tech Support
| | |-+  Tatung VS14428 Video Distortion		 0 Members and 1 Guest are viewing this topic. « previous next »
Pages: [1] Go Down Print
Author Topic: Tatung VS14428 Video Distortion  (Read 9772 times)
mantaramian
Contributing NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 10
Offline Offline

Gender: Male
Posts: 179
« on: February 27, 2011, 07:19:47 PM »
I currently am working on a Bally Game Maker with a monitor problem; the monitor is a Tatung VS 1428. I caped the monitor and brought some life back to it but I am still having some additional problems that have me a little puzzled.

When the screen is collapsed the picture and resolution is great. However, when I try adjusting the picture to fill the screen I am getting some distortion on the top of the picture.

Are there any suggestions to my problem?

I got  a Monitor Repair Guide from Ken Layton Web Sight and made followed the Monitor repair guide (caping out the Monitor)

I will include pictures of what I am talking about.

* 01.JPG (112.76 KB, 1024x768 - viewed 330 times.)

* 02.JPG (128.98 KB, 1024x768 - viewed 366 times.)
Logged
mantaramian
Contributing NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 10
Offline Offline

Gender: Male
Posts: 179
« Reply #1 on: February 27, 2011, 07:20:34 PM »
Here is one more picture to look at..........

* 03.JPG (139.83 KB, 1024x768 - viewed 362 times.)
Logged
Firebird
Contributing Gold NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 5
Offline Offline

Gender: Male
Posts: 243
« Reply #2 on: February 27, 2011, 09:38:49 PM »
Can you post a picture of your monitor board?  Please Post Pictures
Logged
mantaramian
Contributing NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 10
Offline Offline

Gender: Male
Posts: 179
« Reply #3 on: February 27, 2011, 09:41:26 PM »
Here is a pictuer of the chasie before I cleaned it.......  If you need more pictures let me know

* 04.JPG (177.13 KB, 1024x768 - viewed 417 times.)
Logged
cowboygames
Abbys Dad
Contributing Gold NLG Member
Sr.Tech NLG Member 1000+ Post
*

Total Karma Storms: 680
Offline Offline

Gender: Male
Posts: 3916


Happiness in life is a great dog
« Reply #4 on: February 27, 2011, 10:04:52 PM »
I'd look at the resistors in the vertical circuit. Looks a lot like a resistor that's changed values
Logged
mantaramian
Contributing NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 10
Offline Offline

Gender: Male
Posts: 179
« Reply #5 on: February 28, 2011, 02:16:18 AM »
I'd look at the resistors in the vertical circuit. Looks a lot like a resistor that's changed values

Thanks for the headsup. However would you please be a little clearer....

Thanks.....
Logged
cowboygames
Abbys Dad
Contributing Gold NLG Member
Sr.Tech NLG Member 1000+ Post
*

Total Karma Storms: 680
Offline Offline

Gender: Male
Posts: 3916


Happiness in life is a great dog
« Reply #6 on: February 28, 2011, 02:34:17 AM »
Seem to remember back when I was repairing tv's that there was a 1 ohm resistor off the flyback that would change value, increase, and cause this problem. If left to fail it burned the vertical output. Capacitors can cause it to, but you've changed all those and a bad yoke is highly unlikely. It really looks like a vertical size problem which is most likely a resistor going bad. Trace your circuits between the flyback and vertical output and check values on the componants along those circuits. As far as I remember, RCA was the only one that had resistors that only failed under load so if you've got a bad part there it should show up without having to apply power to the circuit.  Anyway, check that with a digital multimeter and see what you find
Logged
mantaramian
Contributing NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 10
Offline Offline

Gender: Male
Posts: 179
« Reply #7 on: February 28, 2011, 03:02:44 AM »
Thanks cowboygames,

I will check this out Monday after work......

I will keep you all posted

Thank you for the info.
Mike
Logged
mantaramian
Contributing NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 10
Offline Offline

Gender: Male
Posts: 179
« Reply #8 on: March 04, 2011, 03:29:09 AM »
So I cleaned up the monitor chaise and checked a few resistors (2 watt .47 ohms around the Fly Back) Everything checked out OK on the bench, So I was able to disassemble the monitor apart and run it from the Slot Machine and noticed one of the Parts with a heatsink attached to it and it runs too hot to touch.

I don believe this is the culprit to my problem since the problem starts with the monitor ice cold.

I am including a few more pictures with the chaise cleaned up....

* 3.1.JPG (86.17 KB, 640x480 - viewed 330 times.)

* 3.2.JPG (75.61 KB, 640x480 - viewed 350 times.)
Logged
mantaramian
Contributing NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 10
Offline Offline

Gender: Male
Posts: 179
« Reply #9 on: March 04, 2011, 03:30:10 AM »
In this picture I identified the part that runs too hot to touch

* 3.3.JPG (73.96 KB, 640x480 - viewed 452 times.)
Logged
cowboygames
Abbys Dad
Contributing Gold NLG Member
Sr.Tech NLG Member 1000+ Post
*

Total Karma Storms: 680
Offline Offline

Gender: Male
Posts: 3916


Happiness in life is a great dog
« Reply #10 on: March 04, 2011, 03:47:09 AM »
part on the heat sink is your vertical out put pack and it's getting hotter than it should(though they do run a little warm anyway)because you're having to over-drive it to get a full size raster. Again, it may not be a resistor, but you've got a bad componant in the vertical circuit. Did you replace all caps in the vertical circuit? Check all diodes? If you can, get the part # off the output and I'll try and find pin outs and voltages you could look at while it's running to help nail it down
Logged
channelmaniac
Surface mount soldering geek
Global NLG Site Moderator
Sr.Tech NLG Member 1000+ Post
*

Total Karma Storms: 568
Offline Offline

Gender: Male
Posts: 2126


Few things are better than fixing an old game...


WWW
« Reply #11 on: March 17, 2011, 04:38:48 PM »
If power to the vertical circuit is fed off the flyback, replace the high speed rectifier diode that supplies the DC power. If the diode is leaking you'll get oddball things happening in that circuit and it'll run hot.

RJ
Logged
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com
mantaramian
Contributing NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 10
Offline Offline

Gender: Male
Posts: 179
« Reply #12 on: March 18, 2011, 02:51:03 AM »
Thanks for the info about the leaky diode, however I am not sure if you are speaking about the LA7837

I found a Schematic that has some reference to the problem I am currently dealing with and will first try the resistor and if that does not work I will let you all know....

I will attach the mocked up diagram.....

* Copy of vs14428_annotated_schematic_diagram.jpg (514.2 KB, 1318x872 - viewed 517 times.)
Logged
channelmaniac
Surface mount soldering geek
Global NLG Site Moderator
Sr.Tech NLG Member 1000+ Post
*

Total Karma Storms: 568
Offline Offline

Gender: Male
Posts: 2126


Few things are better than fixing an old game...


WWW
« Reply #13 on: March 19, 2011, 10:36:54 PM »
What is feeding C706 and C720? Are they fed by a tap off the flyback?
Logged
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com
AnotherTech
Guest
« Reply #14 on: March 20, 2011, 03:34:09 AM »
C714 is bad.  It is a mylar cap, 104pf, 100v.
Logged
mantaramian
Contributing NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 10
Offline Offline

Gender: Male
Posts: 179
« Reply #15 on: April 09, 2011, 10:28:02 PM »
Quote from: AnotherTech on March 20, 2011, 03:34:09 AM
C714 is bad.  It is a mylar cap, 104pf, 100v.

Sorry for the delay, thanks to all that gave me the suggestions based on there experience....

The winner was:

AnotherTech,  Hail

Attached is the fixed Monitor Chaise

* Fixed.jpg (117.18 KB, 1024x878 - viewed 328 times.)
Logged
AnotherTech
Guest
« Reply #16 on: April 09, 2011, 11:56:03 PM »
I'm glad you got it going.
Logged
mantaramian
Contributing NLG Member
NLG Member 101 to 500 Post
*

Total Karma Storms: 10
Offline Offline

Gender: Male
Posts: 179
« Reply #17 on: July 24, 2011, 06:12:43 PM »
I'm Back......

After a few months of playing my Monitor decided to take another dump on me..... Any Suggestions?

When I worked on it last I caped it out Replaced the IC7 (ran HOT) and a leaky and replaced (C714, a Mylar cap, 104pf, 100v).

Here is a picture of what I have now.

* DSC09616.JPG (358.19 KB, 1883x1080 - viewed 330 times.)
Logged
Pages: [1] Go Up Print 
« previous next »
Jump to:  

SimplePortal Classic 2.0.5

If you find this site helpful, Please Consider Making a small donation to help defray the cost of hosting and bandwidth.



Newlifegames.com ™    Newlifegames.net ™    Newlifegames.org ™
   New Life Games ™    NewLifeGames ™  NLG ™ We Bring new Life to old Games ™    1-888-NLG-SLOTS ™
Are all Copyright and Trademarks of New Life Games LLC 1992 - 2021


FAIR USE NOTICE:

This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner.
We make such material available in an effort to advance awareness and understanding of the issues involved.
We believe this constitutes a fair use of any such copyrighted material as provided for in section 107 of the US Copyright Law.
In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those
who have expressed a prior interest in receiving the included information for research and educational purposes.

For more information please visit: http://www.law.cornell.edu/uscode/17/107.shtml.

If you wish to use copyrighted material from this site for purposes of your own that go beyond fair use,
you must obtain permission directly from the copyright owner.

NewLifeGames.net Web-Site is optimized for use with Fire-Fox and a minimum screen resolution of 1280x768 pixels.


Powered by SMF 1.1.20 | SMF © 2013, Simple Machines
Loon Designed by Mystica
Updated by Runic Warrior
Page created in 0.094 seconds with 20 queries.