PCEngineFans.com - The PC Engine and TurboGrafx-16 Community Forum

NEC TG-16/TE/TurboDuo => TG/PCE Repair/Mod Discussion => Topic started by: mario_pic on January 31, 2016, 04:58:17 PM

Title: pce duo not working after recap only card side works
Post by: mario_pic on January 31, 2016, 04:58:17 PM
Just recapped a pce duo went to test it I power system on I get gray screen  if I put a card in game boots works good but I get now sound

The no sound part is not a big deal the one that bothers me is no video in cd mode what should I check  caps are all installed correctly  this problem is a first for me I'm wording where does the duo store the 3.0 card system rim on the board
Title: Re: pce duo not working after recap only card side works
Post by: thesteve on January 31, 2016, 05:29:11 PM
did it work before recap?
Title: Re: pce duo not working after recap only card side works
Post by: mario_pic on February 01, 2016, 04:34:19 AM
Quote from: thesteve on January 31, 2016, 05:29:11 PM
did it work before recap?
b4 recap it was totally dead  no display  at all  or sound caps leaked acid bad but did not eat traces I washed the pcb down in iso alcohol   
Title: Re: pce duo not working after recap only card side works
Post by: DirtMonkey on February 01, 2016, 06:37:14 AM
Just check the output voltage on the 7805 regulator facing away from the card slot.  I just had one bad which was giving me card operation but no CD operation.  This regulator was also running really, really hot.
Title: Re: pce duo not working after recap only card side works
Post by: mario_pic on February 01, 2016, 04:54:52 PM
Quote from: DirtMonkey on February 01, 2016, 06:37:14 AM
Just check the output voltage on the 7805 regulator facing away from the card slot.  I just had one bad which was giving me card operation but no CD operation.  This regulator was also running really, really hot.
replaced the 7805 was over the limit   swapped it out for a new one cd system displays and works another question the 7805 I got is not isolated like the one on the duo came with do I need to put a isolator between the 7805 and the heat sink
Title: Re: pce duo not working after recap only card side works
Post by: thesteve on February 01, 2016, 07:09:07 PM
no isolation needed
the heatsink on the duo is grounded and the 7805 tab is tied to ground internally