I think I have a problem with my NESp

jgibson · Post by **jgibson** » Mon Mar 14, 2005 3:09 pm

I had a problem testing my NESp yesterday. I have the unit wired (save the tact switches, sound, and white led mod for the screen), and when I attemped to power it up, I get nothing. I looked at all of the wiring, and it matches Ben's book. I checked all of the parts of the NES motherboard and noticed that my 7805 voltage regulator is really really hot. Is this normal? Has anyone else had this issue? I don't have the tact switches wired yet, and I don't know if that makes any difference, but I would like to get it working before I drop $60 on one of Ben's cases. I tried wiring the video out to a phono cable and testing it on my regular TV, but that didn't work either. Does anyone have any ideas of what I should do, or how I could test it?

Kai · Post by **Kai** » Mon Mar 14, 2005 3:19 pm

Hi I've not build one nesp by now but that the temperature ist high is quite normal refering to the book (have u installed a heat sink?) What Batteries do you use have you checked that they are powerful enough (page119 in the book)
hope this helps
greetings from germany
Kai

jgibson · Post by **jgibson** » Mon Mar 14, 2005 3:23 pm

Kai wrote:Hi I've not build one nesp by now but that the temperature ist high is quite normal refering to the book (have u installed a heat sink?) What Batteries do you use have you checked that they are powerful enough (page119 in the book)
hope this helps
greetings from germany
Kai

I am using a 9.6 volt 1600 mAH Ni-MH battery that I got from Radio Shack. The unit only needs 5 volts. That's why I am using a 7805, to change 9.6 volts to 5 volts. The book doesn't tell you to use a heat sink on the 7805 on the NES board, but I know the excess voltage is released as heat. Do I need to use a heat sink?

Post by **gannon** » Mon Mar 14, 2005 4:04 pm

hmm... look for any shorts on the board. Do you have a multimeter?

jgibson · Post by **jgibson** » Mon Mar 14, 2005 4:05 pm

no I don't have one

vb_master · Post by **vb_master** » Mon Mar 14, 2005 4:07 pm

gannon wrote:hmm... look for any shorts on the board. Do you have a multimeter?

If you wanted to check for connections to be good, he can hook up an LED to alligator clips.

Post by **gannon** » Mon Mar 14, 2005 4:14 pm

nah, I was going to have him check for continuety to make sure nothing was bridged

cennar · Post by **cennar** » Mon Mar 14, 2005 4:51 pm

maby when you removed the regulator, you fried the new one on instal

jgibson · Post by **jgibson** » Tue Mar 15, 2005 6:56 am

well I checked the board using a magnifying glass and I may have some short circuts. I bought a new 7805 but I haven't installed it yet. Would having an unmodded PSone screen cause the unit not to power up? I know it draws a lot of power, but is it enough to cause it to not work?

jgibson · Post by **jgibson** » Tue Mar 15, 2005 9:53 am

Does anyone know an effective way to test the unit. I want to make sure that it works, by testing, I mean bypass the controller circut board or something to attach it directly to my TV.

Kai · Post by **Kai** » Tue Mar 15, 2005 10:39 am

isn't it possibel just to attach the old rf modulator for testing if nothings short?

jgibson · Post by **jgibson** » Tue Mar 15, 2005 11:17 am

Kai wrote:isn't it possibel just to attach the old rf modulator for testing if nothings short?

I kinda trashed the old rf modulator

Post by **bicostp** » Tue Mar 15, 2005 7:38 pm

This may be a little late, but the first thing I'd suggest is getting a multimeter.