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Hey all, I just acquired a PB Duo 2300c in trade to build some battery packs for that model but all it does at power up is make a startup chime. There's no hard drive sounds and the display never lights up. Does anyone know if this is common and if there are some troubleshooting and repair...

Also wondering if I could lift a bank of ram and see if the issue changes or improves to maybe confirm that it is indeed a vram issue. And if so how can I tell which two are a bank?

You think these would work on the kanga board? https://www.mouser.com/ProductDetail/ISSI/IS41LV16256C-35TLI?qs=NHTRUjBBRiPscTKwmG8dJA%3D%3D

Ahh totally different RAM though...

I saw that as well and also confused. I wish I could just find the chips.

ok so the 3400c board has Two of the 4 I need then? tempting to buy one on FLEEE BAY then...

That’s what I suspected but the size doesn’t seem to pan out. 256k x 4 = 1MB ? And these are impossible to find.

Not at all I could clean the board and take some better photos tomorrow in daylight.

Do you know where the video memory is on the board?

Not that I can tell. The battery looks ok there was a little bit of white corrosion on it but not much and the board looks ok.

These are the ones closest to the video output: But the datasheet says they are 256k x 16. Wouldn’t that be 1MB? https://www.alldatasheet.com/view_datasheet.jsp?sSearchword=V53C16258&sPage=2&sField=2 I am guessing that this is bad VRAM:

Ok that’s why I was holding off on buying a doner 3400. Well shoot. Sourcing out the video ram is looking impossible. Do you know which rams are the vram on the board? There’s ram on the top and two sets on the bottom of the board. I’ll have to try and find a doner 3500 board.

Nevermind about the LT50 vs HK50. I figured out they are completely different. Does the 3400 board have the same VRAM chips as the 3500? If so I will source out a 3400 parts board to salvage them from. Thanks any help.

Hi all, Can someone point me to the VRAM on this 3500 board? On the Mack of the board there are four V53C16258LT50 chips and the datasheet I found for these says they are 256K X 16 so that would mean 1MB. These are also sitting next to the vga connector and video display connector so I’m...

I’ve got some more info on the Kanga. I get the same distorted display results on an external monitor. I don’t see any visible damage from battery leakage on the logic board. Is there any hope for repairing the board? It chimes and boots ok it’s just for this display issue. * yep that was...

That’s probably it!

I tried very hard to fix mine. What I did learn is aligning the glass in the frame is crucial and if not right it can lead you down the path of thinking lines are dead when they are not. But if they are dead then I don’t think there’s anything you can do about it unless we can figure out what...

I’d be surprised.

Ahhh bummer... That happened to me after replacing / ruining / making worse the original one.. I ended up finding another that is so far all good except one pixel. I wish someone could figure out what exactly is going on here.. I don't think it is the carbon zebra stripe rubber connecting the...

Tried two different machines. No luck :(