WTB: NES console only or motherboard

So guys i want to buy an NES console, i only need the console because the one i have, has problems in the GPU, now i live in Portugal/Europe. So someplace were the shipping wont be very high.

I can even buy a working motherboard so i can replace my broken one, has my NES is in good shape, i just want to be the most cheap way for me to get a working NES.

Thank you for your time.

EDIT: Shipping from the US is to much expensive so it needs to be from Europe.

 

You should specify whether you need a NTSC or PAL NES since they contain different chips. Also have you considered that problems in the "GPU" (we call it a "PPU") may actually be something else such as a damaged trace?

 

I've got a french one I was gonna mod but never did that's just lying around.

 

Well for me having a NTSC or PAL is not important has i have read that i can use the same power supply and for the games i will just dissable the lockout chip.
yes you are right i forgot that it was called ppu, about the problem itself i dont know, all i do know, is that its a PPU problem, here are some pics of games playing....

pm sent

 

Actually from the picture your PPU does not appear damaged, instead it looks like there is a broken PPU address line going to VRAM. I think it's PPU A8/pin 30 which should connect to VRAM pin 23. Check the connection before getting another NES, a piece of wire is a lot less expensive.

 

ok il have a look.

I just saw the board and the traces that come out from the vram to the connector seam that sufferd a bit of Corrosion about 5 or 6 traces can that cause my problem? all the connections between the ppu and vram are clean and good.

UPDATE: I tested the continuity on those said traces, and they were working, so i gess that isnt my problem, also i tested those two pins and there was also continuity so i dont know.



Is this correct?

 

Hmm, that's surprising.. It's definitely a VRAM issue because sprites appear to be working fine. Something else I thought of is that it could be that VRAM is disabled or less likely, dead. This might explain how the patterns showing up on screen increment; basically during rendering the PPU increments counters and outputs the values to be latched by the '373, which are then fetched from VRAM. If the VRAM doesn't drive the bus the PPU will fetch back the values it placed on the bus a cycle earlier.

As part of normal operation PPU A13 (pin 25) should go into an inverter, not sure which part this is on a NES since it differs from the FC, then it goes from the inverter to the cart, and is passed back from the cart back to the VRAM /CE (pin 18). Alternatively it could be that the PPU's /RD strobe (pin 24) has a bad connection to VRAM /OE (pin 20) too.

 

i tested PPU pin 24 with vram pin 20 and it has connectivity so i have to find a way to test the other alternative.

also i tested the voltage of the vram as you said it could be dead and i have about 5v so its not dead.

 

Trace PPU pin 24 out to the connector then trace VRAM pin 20 back from the connector. If both are fine then the chip could be dead, but it's still unlikely.

No matter which pin you measured it won't really indicate whether the chip is dead or not.

I can't think of anything else to test now, I also can't really think of how the PPU input/output buffers could be fried which would have the same effect.

 

Trace PPU pin 24 out to the connector then trace VRAM pin 20 back from the connector. If both are fine then the chip could be dead, but it's still unlikely.

No matter which pin you measured it won't really indicate whether the chip is dead or not.

I can't think of anything else to test now, I also can't think of how each PPU data input/output buffer could be fried which would have the same effect so I still don't think it's the PPU.

 

I already had tested the PPU pin24 to vpram pin 20 and they were fine what i counlnt test is pin 25 that you said that it goes to an inverter.

Update: i just tested pin 25 to the inverter and inverter to cart and both have continuity

Im going to make a status report:

1º Corroted Traces not a problem.

2º PPU Pin 30 to Vram Pin 23 - OK

3º PPU Pin 25 to Inverter Pin 3A/5 - OK

4º Inverter Pin 3Y/6 to Cart slot - OK

5º PPU Pin 24 to Vram Pin 20 - OK

 

BUMP, still looking for console only or motherboard.

 

another bump

 

http://www.ebay.com/itm/Working-boa...623?pt=LH_DefaultDomain_0&hash=item2c5f254b2f

I heres a motherboard, ntsc.

 

I've got an NTSC-U NES-001 here I can offer you. Unfortunately I'm in the US but if that doesn't bother you I'm happy to ship internationally.

PM sent.

 

omg a 13,000 dollar nes.


hehehehee

 

Ok guys i talked to APE its a no go, the shipping is just to expensive, so i probably need some one from europe.