no voltage reading with core

Testing/Troubleshooting
1

ok i put together smash tvs core and i got a 5v reading with MCLR(1) - IC1:Vss(12) but no reading with Vdd(11) - IC1:Vss(12), Vdd(32) - IC1:Vss(31) and IC2(8) - IC2:(5)..

could this be a short or just a bad solder? im using the c64 psu

Thanks!

Sean

2

Hi,

Could this be an OPEN? :wink: There’s one jumper (or airwire, if you prefer that word) in SmashTV’s layout, about in the middle of the board on the leftside, while looking from above - basicly feeding Vdd connection to the pins you mentioned not having +5v.. Are you sure it’s in place?

Bye, Moebius

3

i know what your talking about but i dont see anything like that on the board i have…supposed to be j3 or something like that right?

4

Sounds like you should go see SmashTV’s page about the his core module layout:

http://avi.dezines.com/mbhp/mbhp_coreR3.html

…it’s a bit different from the one seen on ucapps.de.

Sorry for using such a confusing description.. it’s a, hmm.. a wirelink? (Please folks, what should those REALLY be called?!).. But anyway, in the pics on Smash’s site, those are red in colour and/or painted with a white dashed line on top of the (actual) pcb.

Bye, Moebius

5

I didn’t realise smash was making little alterations/improvements, that’s cool  8)

Hey smashtv, the link to buy from that page is broken …

Anyway I found the page, just made up my wishlist and its like 700 bucks  ;D Get ready for some cashflow in a few weeks man!  :smiley:

6

yea im going to have to go over everything again..im not sure what to call those connections either oh well…thanks for the replys though

7

i forgot also to mention the 7805 was getting really hot…wonder that has anything to do with it..

dont think will really help but here is a pic of my board:

8

Hi,

It’s hard to say from this angle, if the wire is there.. there should be one horizontal wirelink, and it’s location is about between C3 and Q1.

Maybe a close-up from the solderside would reveal something new?

If the 7805 with that setup (no PIC, no other boards connected) is getting (real) hot, maybe there IS a short somewhere..  :-\

Bye, Moebius

9

that one connection by c3 is there..

i took a pic of the solder side: http://dsdigitalmedia.com/images/solderside.jpg..

not the best solder job in the world but oh well..lol

Sean

10

ok it must have been a bad solder…got the voltage readings for all the pins..woo hoo…thanks for the replys..

Sean

11

Ok, great!

M