neotec nt-27e mid res chassis issue. no power

[GMZombie]

ok quick question there is a cap c19 on the pincushion board that i dont have a cap for but it is labeled as being in the kit. 6.8uf@50v. the only cap i have left though is a 10uf@100v would that work as i have 1 chassis that is working again but i still cant change my horizontal size. would that cap be the reason? board 2 i capped but still has a problem voltage at d107 still is going up and the 25volts on the d106 is jumping around randomly never going above 18v

[lilshawn]

just do them one at a time... keep in mind the orientation (+/-) there are cases where some of the markings are printed backwards on the board. caps explode violently if installed backwards.

[GMZombie]

  good news first! i have 2 chassis's out of technically 4 working as of right now. have to wait on the 6.8uf@50v bp cap to come in for the pincushion board but no big deal. now i say i have 4 but really it was 3 from the kid and one parts chassis. come to find out my parts chassis just needed a few things re soldered and a hot and a fet. so that one works. i got the original working again with the horizontal working now but i had used the my parts chassis pincushion board to get that to work. the 10uf@100v for the 6.8uf@50v bp would not work. go figure. now i have 1 of that is from him that just wont power up. i have put in known good fet/hot's and checked the voltage at d107 and 106 and d107 dosent show any voltage while d106 shows steady 96.9vdc. i changed out the smps controller ic just to make sure but it didnt do anything. this board has had the cap kit done to it.

[GMZombie]

ok i think i am going to just call that second board the parts board...anyways i have 1 more that when taking voltage my volts at the hot are 123vdc. i checked the usual places and they are all in spec im getting my 124/25 volts out at d106 and d107 but the system dosent turn on. can a hot be band and not chirp make a sound>?

[GMZombie]

  RANT: Damn neotec chassis's...i dont get it all i did was change the damn caps and now i get the voltage problem again where the voltage is fluctuating at the diodes to check. d107. damn it i knew i shouldnt have screwed with the caps but i had the cap kit for it and needed to get the horizontal width working...now back to stage 1.how exactly do i need to check the smps controller chip. pin to ground or cause its on hot side pin to a pin from the filter cap?

EDIT:: fixed it. rethought about it and forgot to readjust the b+. now it starts up again

[GMZombie]

ok this last chassis has me puzzled. still the 27e and it has steady 114vdc at hot  center pin. i have 26vdc where needed and 12vdc where needed?? I even replaced the flyback just in case and it still wont fire up? whats going on

[grantspain]

if you have the schems then locate the b+ pin on the flyback,desolder that pin and add a 115vac light bulb across the pin and ground
if it powers up and the voltage is correct and stable then power supply is ok and fault is on horizontal deflection as you have proved its not flyback

last neotec i worked on one of the high voltage poly caps on the hot collector was shorted

[GMZombie]

where are these high voltage poly caps you talk about?

[lilshawn]

the big orange blobby looking ones.

check them out...look for dark spots on them. sometimes they will give themselves away like that.

[GMZombie]

are we talking the really orange circle ones or the more fatish square ones?

[lilshawn]

[grantspain]

need to read them with a cap meter-you can't guess if they are ok

[GMZombie]

with reguarding a cap meter can i just get one of the 30 dollar cap meters on ebay? like this

http://www.ebay.com/itm/VC6243-LC-Digital-Meter-Inductance-Capacitance-Cap-DMM-/300559460479?pt=LH_DefaultDomain_0&hash=item45fabd687f

or
http://www.ebay.com/itm/General-CAP1500-Digital-Wide-Range-Capacitor-Tester-/190754909170?pt=LH_DefaultDomain_0&hash=item2c69e0ebf2

or would it be better to get a more expensive one?

[grantspain]

yeah second is fine
first is limited in range but good if you want to read deflection yokes

[GMZombie]

i bought the second one. should be here in a few days i hope.