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Author Topic: Recapping a Billabs BL27CB0P  (Read 189 times)

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the_77x42

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Recapping a Billabs BL27CB0P
« on: April 11, 2018, 09:11:30 pm »
I'm doing a capacitor replacement on my Billabs BL27CB0P. I'm going to document the process here for anyone else intending to do the same.

Ever since I got the monitor I noticed some squishing around the edges. In sidescrollers, it's like the image is being wrapped onto the screen as if it's being pulled off a roll of paper towel. Although I learned to just live with it over the last ten years, the last time I opened up the back of the cabinet I noticed a couple bulging capacitors. It's time for an overhaul. Hopefully it fixes the edge squishing, but if not, at least it will hopefully last another ten years.

The BL27CB0P is a 27" multisync monitor and there is little information about it online, but the original product page is archived here. Although it's a rebranded Wei-Ya, I can't find the original Wei-Ya model number. As such, I've had no luck finding schematics online.

I've setup a shared Google Drive folder with disassembly images and a capacitor inventory. The inventory sheet has tabs for the Mainboard, Neckboard, and VGAboard. I'm getting help from Peter at arcadepartsandrepair.com. He's going to be the one setting up a cap kit for me.

This will be my first cap kit installation, so I'm excited. Well, as excited as I can be for something that has 72 caps... Yikes. Stay tuned...


the_77x42

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Re: Recapping a Billabs BL27CB0P
« Reply #1 on: April 14, 2018, 12:14:07 am »
The first step was discharging the monitor and removing the board. I used this video as a guide. My tool of choice was a long screwdriver with alligator clips and solid core wire. One thing I did just to make sure everything was connected was do a continuity test from the tip of my screwdriver to the chassis. Everything came apart without issue. I took all the pictures in the post above so I had a record of how everything went back together. Since no cap kits for the monitor exist, I needed to take it apart and inventory everything. It will take a week or two before the kit arrives, so in the meantime I had to stock up on some tools...

I grabbed a Hakko FR-301 desoldering tool from tequipment.net. I figure I can do a cap kit install in some friends' machines as well. It's pricey, but it should last me a long time.

I also ran a voltmeter on every cap to make sure they were all discharged. I tested the capacitance of a few on the board and I noticed that one of the bulgers (C30) wasn't reading any capacitance... Maybe that one is the main culprit!

Stay tuned...

grantspain

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Re: Recapping a Billabs BL27CB0P
« Reply #2 on: April 14, 2018, 07:08:30 pm »
surely this is a wei ya 3129 chassis or maybe a rodotron 666 chassis
in which case a massive amount if info is out there for these
in regards to your side compression this well documented on various forums, it is down to the value of the hv caps in the horizontal section

the_77x42

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Re: Recapping a Billabs BL27CB0P
« Reply #3 on: April 14, 2018, 09:23:33 pm »
surely this is a wei ya 3129 chassis or maybe a rodotron 666 chassis
in which case a massive amount if info is out there for these
in regards to your side compression this well documented on various forums, it is down to the value of the hv caps in the horizontal section

Thanks for the leads! I was looking at the schematics for the 666 and unfortunately they are not the same. I had hoped that I could fix the side compression as documented here, but C86 on my chassis is a 1uF electrolytic radial.

I've also been looking at this thread, which describes my exact problem and attributes the horizontal compression to the VGA signal from my graphics card. I've setup my GroovyMAME profile based on a D9800 and have been meaning to experiment to get the exact monitor specs, but have not had the time. Regardless, since caps are failing on the chassis, I'll replace those then dive into the monitor profile.

grantspain

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Re: Recapping a Billabs BL27CB0P
« Reply #4 on: April 15, 2018, 01:19:47 pm »
do you have a photo of the chassis, if its not wei ya then perhaps its a rebranded kortek

the_77x42

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Re: Recapping a Billabs BL27CB0P
« Reply #5 on: April 15, 2018, 03:35:43 pm »
do you have a photo of the chassis, if its not wei ya then perhaps its a rebranded kortek

It's still mounted in the machine. All markings on it are Billabs. The photos of the disassembly are here, maybe those could help?

grantspain

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Re: Recapping a Billabs BL27CB0P
« Reply #6 on: April 15, 2018, 06:42:10 pm »
pretty sure that is a wei ya m2929dc

the_77x42

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Re: Recapping a Billabs BL27CB0P
« Reply #7 on: April 16, 2018, 05:24:12 am »
pretty sure that is a wei ya m2929dc

That's what I thought as well, but I've been working with Peter at arcadepartsandrepair.com on the cap kit and after going over the M2929 schematic, they are very close (85%), but slightly different.

  
 

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