Build Your Own Arcade Controls Forum

Main => Monitor/Video Forum => Topic started by: dabone on April 22, 2004, 08:14:49 pm

Title: k7000 problems (2 or them)
Post by: dabone on April 22, 2004, 08:14:49 pm

I've got a 25" k7000 series monitor having the following troubles.
I've got it pair with a arcadevga.

The monitor seems to suffer from blooming. (i.e. picture enlarging/shrinking due to what is displayed)

And also, on the right hand side I'm getting horziontal compression along the edge (maybe last 3/4 inch).

It has just gotten a cap hit and a new horzionatal output transistor.

For the problem of the horz compression I've played with the width, the size (the 3 jumper positions on the board) and the 50/60 hz control.

Any suggestions welcome.


Later,
dabone

Title: Re:k7000 problems (2 or them)
Post by: Ken Layton on April 23, 2004, 01:13:22 am

Replace the flyback transformer and it should take of the blooming and compression problems.

Title: Re:k7000 problems (2 or them)
Post by: dabone on April 23, 2004, 07:13:15 am

Thanks, I'll order one today.
(I thought that would be the case, but I wanted a second opinion.)



Thanks again Ken, you the man!


later,
dabone

Title: Re:k7000 problems (2 or them)
Post by: Ken Layton on April 23, 2004, 11:58:22 am

Blooming is always caused by the high voltage being lower than normal. The only source of the high voltage in a monitor or tv set is the flyback. I bet yours may have a shorted turn or two of it's wires internally. That would also explain the compression problem. My vote is to replace the flyback since it is a common failure item.

Title: Re:k7000 problems Solved!
Post by: dabone on May 11, 2004, 11:28:20 pm

After much nashing of teeth and cursing, I've finally fixed the horziontal compression. I've had this monitor for years, but apparently before I got it, some one took it upon themselves to replace c37 and c38 with larger caps than the monitor needed. Zanen said thats a old trick to get more width out of the monitor, but thats what was causing the compression (And most of the blooming!).

It finally took a call to Well Gardner to find out the section to work on for this. They were VERY eager to help. (I told the guy how old the monitor was and he still took about 5 mins walking me thru things to check). Quick call to Zanen, and I only had to tell him the cap numbers, he looked up the correct values and had them on the way.

Thanks for the suggestions, but apparently sometime the manufactuer still knows whats going on.

(And the new flyback probally didn't hurt anything either!)

Later,
dabone