Weche Ok Baby identifying monitor and chassis

[ZeroGoukiX]

Hi guys earlier this year I acquired an Ok Baby from a friend and refurbished it. I’m pretty happy with the results except for the monitor. The monitor works decently enough but it’s having issues with colors washing out and I can’t get good black without the image being dim so I was looking into what I could do to work on it or eventually replace the chassis. My issue is that I have no way to identify the tube nor the chassis. All I know is that it’s a 28” monitor from Ying Tchin. I’ve searched around and can’t find any info on these. Has anyone worked on these before? Is the tube actually from YTE or is it just rebranded from someone else? The manual mentions that the 28” is from Pentranic but I don’t think this monitor is. Any help would be appreciated. Last pic is where it’s currently sitting at my local pinball arcade for the winter. Thanks guys.

 

[thomasbender]

I got my OkBaby cab from Yubiparts out of Yonkers a couple of years ago. I restored one of them. It has a Toshiba tube and generic chassis similar to (but not the same as!) the Universal chassis you see on Aliexpress.

It had caps that were outright detached from the board. The universal chassis was relatively inexpensive so I replaced the whole thing. Some photos: https://www.arcade-projects.com/threads/babys-first-candy-cab-ok-baby-restoration.32349/post-477398

I have a photo of the tube's model no. on another device... but it's a Toshiba tube.

It's possible that both my set and your set are non-original. But sharing my info for the sake of publishing info.

 

[ZeroGoukiX]

I got my OkBaby cab from Yubiparts out of Yonkers a couple of years ago. I restored one of them. It has a Toshiba tube and generic chassis similar to (but not the same as!) the Universal chassis you see on Aliexpress.

It had caps that were outright detached from the board. The universal chassis was relatively inexpensive so I replaced the whole thing. Some photos: https://www.arcade-projects.com/threads/babys-first-candy-cab-ok-baby-restoration.32349/post-477398

I have a photo of the tube's model no. on another device... but it's a Toshiba tube.

It's possible that both my set and your set are non-original. But sharing my info for the sake of publishing info.

I appreciate it, it’s weird because both the tube and the chassis are from YTE. Most of the universal chassis I’m seeing both old and new don’t resemble what I’ve seen from this. Though I’m sure I can find one that’s similar enough to where I can go off of it. I’ve seen the Wei-Ya 828HR 428H and I want to say that’s the closest resemblance I’ve seen so far.

 

[CamoYoshi]

If you can get photos of the top and bottom of the PCB it would be useful; we can then compare with other known models to determine if it's possibly a clone.

YTE (Ying Tchin) tends to make clones of existing hardware, so it's likely that it could be a clone of a Wei-Ya (aka Aygo, originally).

 

[ZeroGoukiX]

If you can get photos of the top and bottom of the PCB it would be useful; we can then compare with other known models to determine if it's possibly a clone.

YTE (Ying Tchin) tends to make clones of existing hardware, so it's likely that it could be a clone of a Wei-Ya (aka Aygo, originally).

It’s going to be quite awhile before I can do that because the cab isn’t in my possession right now but I’ll try to post those when I can.

 

[ZeroGoukiX]

So I had some time to measure the tube and take what pics I could, the tube is actually 27” viewable and 28.5”. I measured it before but I didn’t know that US went by viewable screen size so it is actually a 27” lol The tube does not have a tube code label on the monitor, there was something but its buried underneath and hidden. My apologies this was the best I could do for photos I cannot remove the monitor at this point in time. Looks like their own branded chassis after all. It does remind me of some of the Wei-Ya chassis I’ve seen.

 

[thomasbender]

Your Wei Ya clone is similar-to, but not the same as my Wei Ya clone and that's not the same as the current crop of Aliexpress clones.

Reusing photos from my other post:

Left is what my OkBaby had. What I can tell right away compared to your photos:
- More pots
- A more-populated neckboard
- Different color flyback

Right is what I placed in my cab. It's a notably sparser in parts compared to stock so it definitely had its rounds of cost-reduction. I bought it to push the project along. If this were a proper Nanao, etc I would've tried to salvage the existing.

All three of these do have their similarities. It's a true cloning wild west. Similar heatsinks and other parts. They use that seemingly unnamed 5-pin video connector as what they pack with the GBS upscaler boards, a deceiving 2-prong power cable you 10000% need to wire to an Iso transformer, and otherwise bog-standard JST connectors.

On flipside, whatever yoke you have looks a lot better than mine. Look how thin those wires are:

 

[ZeroGoukiX]

Oh I was able to find an old Reddit post, he was asking about his tube from his ok baby and the YTE stickers match, his and mine were a YTE 85813 but he had his tube sticker. A Pentranic tube which does line up with the manual saying the 28” was a Pentranic tube.

 

[ZeroGoukiX]

I really don’t like how this chassis has you plug it in like it’s a normal crt tv. I almost fell into that trap of trying to plug it into an outlet. I never did and thank god. You can see the iso transformer is on the psu and there’s an outlet for the chassis. Knowing what I know now I really want to rewire this somehow.

 

[thomasbender]

I misremembered! I'm getting old!!

It's not a Toshiba. I found the photo of my tube model no. from an old discord message:

I repeat: It may be very possible this wasn't stock. Maybe maybe not.

 

[ZeroGoukiX]

I misremembered! I'm getting old!!

It's not a Toshiba. I found the photo of my tube model no. from an old discord message:

I repeat: It may be very possible this wasn't stock. Maybe maybe not.

If one thing is certain about bootlegs is that nothing is certain.

 

[thomasbender]

I really don’t like how this chassis has you plug it in like it’s a normal crt tv. I almost fell into that trap of trying to plug it into an outlet. I never did and thank god. You can see the iso transformer is on the psu and there’s an outlet for the chassis. Knowing what I know now I really want to rewire this somehow.

Every time I see that base I get jealous. Look at what I inherited:

Whoever was the tech threw it out and slapped on a piece of wood instead

Had to throw out all of the parts but the circular 2-prong and the wood slab itself. Even the old Iso was bad.

 

[ZeroGoukiX]

Every time I see that base I get jealous. Look at what I inherited:

Whoever was the tech threw it out and slapped on a piece of wood instead

Had to throw out all of the parts but the circular 2-prong and the wood slab itself. Even the old Iso was bad.

I like this actually, I get that it was a pain in the ass to fix but now you have access to everything. My service button doesn’t work and neither does the stereo amp. Lol Also if you decide to get a new chassis you can wire it directly to the transformer and ditch the plug.

 

[trashedcabs]

So my understanding of how WeChe sold these is that the bodies were shipped flat packed to distributors who would install electronics depending on what was available domestically, which is why they all seem to have different stuff inside depending on where they came from.

So I had some time to measure the tube and take what pics I could, the tube is actually 27” viewable and 28.5”. I measured it before but I didn’t know that US went by viewable screen size so it is actually a 27” lol The tube does not have a tube code label on the monitor, there was something but its buried underneath and hidden. My apologies this was the best I could do for photos I cannot remove the monitor at this point in time. Looks like their own branded chassis after all. It does remind me of some of the Wei-Ya chassis I’ve seen.

This looks like some sort of variant of the Pentranic CH-288, which is a Wei-ya rebrand. However, the CH-288 is a switchable dual-res chassis and what you have is single res. Either way it should be similar enough to follow the schematic.

 

[ZeroGoukiX]

I’d like to at least do a cap kit on my current chassis, which is gonna be difficult as it’s a hodgepodge of different chassis. I have 3 main things I want to fix, the dim brightness, the slight color changes, and the geometry. It looks okay I did what I could with it. I can’t upload my other pics. lol