It is currently Thu May 25, 2017 3:48 am

All times are UTC - 7 hours





Post new topic Reply to topic  [ 7 posts ] 
Author Message
PostPosted: Sat Dec 10, 2016 6:35 pm 
Offline
Formerly Fx3
User avatar

Joined: Fri Nov 12, 2004 4:59 pm
Posts: 2988
Location: Brazil
The games work, sound and inputs work, but the image... is all messed up. I cleaned up the cartridge connectors and tried to clean the console 72pin connector too. No result.

Is this dirty connectors or... malfunction of the console? (Yup, it's a toploader NES compatible console).


Attachments:
IMG_20161210_232833025.jpg
IMG_20161210_232833025.jpg [ 361.92 KiB | Viewed 691 times ]
IMG_20161210_232647687.jpg
IMG_20161210_232647687.jpg [ 366.47 KiB | Viewed 691 times ]
Top
 Profile  
 
PostPosted: Sat Dec 10, 2016 6:53 pm 
Offline
User avatar

Joined: Fri Nov 19, 2004 7:35 pm
Posts: 3846
Wrong voltage?

_________________
Here come the fortune cookies! Here come the fortune cookies! They're wearing paper hats!


Top
 Profile  
 
PostPosted: Sat Dec 10, 2016 7:11 pm 
Offline
Formerly Fx3
User avatar

Joined: Fri Nov 12, 2004 4:59 pm
Posts: 2988
Location: Brazil
Tried down to 12v. No result. The USA NES worked fine though.


Top
 Profile  
 
PostPosted: Sat Dec 10, 2016 7:18 pm 
Offline

Joined: Sun Apr 13, 2008 11:12 am
Posts: 5687
Location: Seattle
Looks to me like one of address lines is broken, because of the repeated stride both horizontally (within the nametable) and vertically (within each tile)


Top
 Profile  
 
PostPosted: Sat Dec 10, 2016 7:46 pm 
Offline

Joined: Sun Sep 19, 2004 11:12 pm
Posts: 18346
Location: NE Indiana, USA (NTSC)
Repetition of 4-tile-wide columns can mean one thing: PA2 is not connecting. Look up the VRAM pinout and the PPU pinout, and check continuity.


Top
 Profile  
 
PostPosted: Sun Dec 11, 2016 5:30 am 
Offline
Formerly Fx3
User avatar

Joined: Fri Nov 12, 2004 4:59 pm
Posts: 2988
Location: Brazil
It had such glitch (less intense), but it was fine after a few resets/power off->on. This console is over 30 years! ^_^;;
I'll send it for repairs tomorrow. Thanks.


Top
 Profile  
 
PostPosted: Fri Feb 03, 2017 1:48 pm 
Offline
User avatar

Joined: Sat Jul 04, 2015 9:58 am
Posts: 427
Location: -29.794229 -55.795374
I've got a "naked" PCB from this clone.
Here is the solder side and the component side.
Can someone please draw the full schematics for this?
I think the schematic will help a lot on this and in future repairs.
Thanks in advance.

Edit: I tried to simulate this defect by puting plastic tape on some of the cartridge's contacts but could not get the same result.
Even it's more than one cartridge's connector pin that is bad or it's some pin on the memory/latch interface.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group