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Main => Monitor/Video Forum => Topic started by: skinnyd77 on February 27, 2011, 10:57:06 pm

Title: Pentranic 1025 help
Post by: skinnyd77 on February 27, 2011, 10:57:06 pm

Hi,

I've got a Pentranic 1025 (25") inside of a mame cabinet I'm building.  I using an ArcadeVga card as a video interface.  The monitor is almost identical to this one: http://www.jomac.net.au/Pentranic_Rodotron_CH288.jpg (http://www.jomac.net.au/Pentranic_Rodotron_CH288.jpg)

Here's what happened:

Once I finally had all the wiring in and everything setup inside the cab, I powered on the monitor and PC.  The boot-up screens and Windows welcome screen came up fine, but the image was flipping.  When I started to turn the V-hold knob on the remote adjustment board, the image immediately shrank to a single line running left to right across the middle of the monitor.  There MAY have been a puff of smoke, but I did not see any, just kind of a metallic smell from the back when I powered everything off.

From hours of googling, I found that I could have any number of problems.  This website http://www.repairfaq.org/samnew/tvfaq.htm (http://www.repairfaq.org/samnew/tvfaq.htm) was surprisingly informative, but put me no nearer to a solution.

The other thing I should probably mention is that I am scared to death of poking around the monitor components, nor are my soldering skills up to par for a task like this (I think).

My best guess is that the knob that controls v-hold is toast, but I haven't a clue how to fix that. 

I'm contacting the arcade where I bought the cabinet in the morning, but if it's something I can attempt to fix myself rather than pay someone, that would be obviously a lot better.  There are 1 or 2 local repair places that I can call, but any help or opinions are greatly appreciated.

Thanks in advance
David

Title: Re: Pentranic 1025 help
Post by: Rickn on February 28, 2011, 08:02:16 am

Because you mention it is model 1019, I do not think it is a CH288. the first 2 numbers in the Pentranic scheme being 10 would normaly indicate that it requiers an isolation transformer. Check aroud the board for silk screening of the chassis #. If it is a true CH288, you will find that number on the circuit board by the flyback.

If so replace C318 a small Tantalum capacitor, if it gets out of tolerance it can cause all kinds of issues.

Good luck!
Rick

Title: Re: Pentranic 1025 help
Post by: Rickn on February 28, 2011, 08:04:16 am

Sorry, meant to say model 1025, not 1019, but same still applies.