How to get main board out of PTV

B

BFriedl

Guest
Bill Jr and group,
I found a short on the control board's B+ connector in this VS-6015 mits
v10 set. Problem is, I cant get board out because of anode wire. Do I
have to disconnect anode from all three guns to get this thing out to
test, or can I just cut the wire and install a connector or solder it
back together when im done? Doesnt seem the latter is a good idea
though, with kV going though it. Need to get this board on my bench so I
can find why B+ has 1.2 ohms resistance to ground on connector PA.

PS. Set been off for 2 weeks...any HV left?
PPS..Is the HV stored in the tube or the flyback?

--
BFriedl
A+ Certified Technician
AIM: UACybercat
** Bear Down Arizona! **
******* Go Cats! *******
 
Anode wire comes out of flyback if I remember correctly.

BFriedl <junk-remove-@bfriedl.com> wrote in message
news:OPLFb.21490$J77.3504@fed1read07...
Bill Jr and group,
I found a short on the control board's B+ connector in this VS-6015 mits
v10 set. Problem is, I cant get board out because of anode wire. Do I
have to disconnect anode from all three guns to get this thing out to
test, or can I just cut the wire and install a connector or solder it
back together when im done? Doesnt seem the latter is a good idea
though, with kV going though it. Need to get this board on my bench so I
can find why B+ has 1.2 ohms resistance to ground on connector PA.

PS. Set been off for 2 weeks...any HV left?
PPS..Is the HV stored in the tube or the flyback?

--
BFriedl
A+ Certified Technician
AIM: UACybercat
** Bear Down Arizona! **
******* Go Cats! *******
Click to expand...
 
Indeed it does...doesnt really answer my question though, does it?

David wrote:

Anode wire comes out of flyback if I remember correctly.

BFriedl <junk-remove-@bfriedl.com> wrote in message
news:OPLFb.21490$J77.3504@fed1read07...

Bill Jr and group,
I found a short on the control board's B+ connector in this VS-6015 mits
v10 set. Problem is, I cant get board out because of anode wire. Do I
have to disconnect anode from all three guns to get this thing out to
test, or can I just cut the wire and install a connector or solder it
back together when im done? Doesnt seem the latter is a good idea
though, with kV going though it. Need to get this board on my bench so I
can find why B+ has 1.2 ohms resistance to ground on connector PA.

PS. Set been off for 2 weeks...any HV left?
PPS..Is the HV stored in the tube or the flyback?

--
BFriedl
A+ Certified Technician
AIM: UACybercat
** Bear Down Arizona! **
******* Go Cats! *******
Click to expand...
--
BFriedl
A+ Certified Technician
AIM: UACybercat
** Bear Down Arizona! **
******* Go Cats! *******
 
BFriedl,

The other posts are accurate.
The anode connector simply removes from the flyback and the HV is reduced
within about 10-20 seconds.
Sounds like the 2SD1556 H.O.T. is toast.
Usually caused by 130 volt B+ going over voltage.
The power supply will probably be the culprit, after you replace the H.O.T.
While you have the deflection board out, replace C5002 (always), both 100uf
and 2200uf caps in the vertical circuit, the LA7838, the 1uf 200 volt cap
off the horiz driver supply, and any other electrolytics that look suspect.
Don't forget to clean all the black goo off the board.
Then replace the caps in the primary of the both SMPS as well as the 270k
resistors (R903, R914 with 1/4 watt versions), increase R918 to a 1k 1/2
watt resistor, and do a light bulb test on the 130 volt line for regulation.
It is best to disable the second SMPS (IC901 circuit by removing L904 while
doing this test.


Good Luck,
Bill Jr


"David" <dkuhajda@locl.net.spam> wrote in message
news:3fe7b7df@news.greennet.net...
Anode wire comes out of flyback if I remember correctly.

BFriedl <junk-remove-@bfriedl.com> wrote in message
news:OPLFb.21490$J77.3504@fed1read07...
Bill Jr and group,
I found a short on the control board's B+ connector in this VS-6015 mits
v10 set. Problem is, I cant get board out because of anode wire. Do I
have to disconnect anode from all three guns to get this thing out to
test, or can I just cut the wire and install a connector or solder it
back together when im done? Doesnt seem the latter is a good idea
though, with kV going though it. Need to get this board on my bench so I
can find why B+ has 1.2 ohms resistance to ground on connector PA.

PS. Set been off for 2 weeks...any HV left?
PPS..Is the HV stored in the tube or the flyback?

--
BFriedl
A+ Certified Technician
AIM: UACybercat
** Bear Down Arizona! **
******* Go Cats! *******
Click to expand...
 
On Mon, 22 Dec 2003 20:52:01 -0700, BFriedl <junk-remove-@bfriedl.com>
wrote:

Indeed it does...doesnt really answer my question though, does it?
Click to expand...
It does indeed. You specifically asked how to disconnect the anode
wire to facilitate the board removal. As David said, the lead pulls
out of the flyback. (At least that's how I read your question)

Alan Harriman


David wrote:

Anode wire comes out of flyback if I remember correctly.

BFriedl <junk-remove-@bfriedl.com> wrote in message
news:OPLFb.21490$J77.3504@fed1read07...

Bill Jr and group,
I found a short on the control board's B+ connector in this VS-6015 mits
v10 set. Problem is, I cant get board out because of anode wire. Do I
have to disconnect anode from all three guns to get this thing out to
test, or can I just cut the wire and install a connector or solder it
back together when im done? Doesnt seem the latter is a good idea
though, with kV going though it. Need to get this board on my bench so I
can find why B+ has 1.2 ohms resistance to ground on connector PA.

PS. Set been off for 2 weeks...any HV left?
PPS..Is the HV stored in the tube or the flyback?

--
BFriedl
A+ Certified Technician
AIM: UACybercat
** Bear Down Arizona! **
******* Go Cats! *******
Click to expand...
 
Then why all the hype over high voltage on the flyback??

ps. Bill, already did your recommendations for the smps, and get +129v
with bulb test on B+. Will esr caps on deflection board.

Bill Jr wrote:
BFriedl,

The other posts are accurate.
The anode connector simply removes from the flyback and the HV is reduced
within about 10-20 seconds.
Sounds like the 2SD1556 H.O.T. is toast.
Usually caused by 130 volt B+ going over voltage.
The power supply will probably be the culprit, after you replace the H.O.T.
While you have the deflection board out, replace C5002 (always), both 100uf
and 2200uf caps in the vertical circuit, the LA7838, the 1uf 200 volt cap
off the horiz driver supply, and any other electrolytics that look suspect.
Don't forget to clean all the black goo off the board.
Then replace the caps in the primary of the both SMPS as well as the 270k
resistors (R903, R914 with 1/4 watt versions), increase R918 to a 1k 1/2
watt resistor, and do a light bulb test on the 130 volt line for regulation.
It is best to disable the second SMPS (IC901 circuit by removing L904 while
doing this test.


Good Luck,
Bill Jr


"David" <dkuhajda@locl.net.spam> wrote in message
news:3fe7b7df@news.greennet.net...

Anode wire comes out of flyback if I remember correctly.

BFriedl <junk-remove-@bfriedl.com> wrote in message
news:OPLFb.21490$J77.3504@fed1read07...

Bill Jr and group,
I found a short on the control board's B+ connector in this VS-6015 mits
v10 set. Problem is, I cant get board out because of anode wire. Do I
have to disconnect anode from all three guns to get this thing out to
test, or can I just cut the wire and install a connector or solder it
back together when im done? Doesnt seem the latter is a good idea
though, with kV going though it. Need to get this board on my bench so I
can find why B+ has 1.2 ohms resistance to ground on connector PA.

PS. Set been off for 2 weeks...any HV left?
PPS..Is the HV stored in the tube or the flyback?

--
BFriedl
A+ Certified Technician
AIM: UACybercat
** Bear Down Arizona! **
******* Go Cats! *******
Click to expand...
--
BFriedl
A+ Certified Technician
AIM: UACybercat
** Bear Down Arizona! **
******* Go Cats! *******
 
Hi Bill.
Awhile back you mentioned that you might have
the ufiche service manual for a Zenith PTV PVR4663RK
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&selm=Mkkqb.10549%24jW5.226875%40twister.tampabay.rr.com

Turns out that the schematic that was sent
to me was the wrong one. It was for a 27" model
that was very similar, but of course, the convergence
section is radically different. No surprises there.

I tried to email about this but may letter bounced back,
even with the nospam removed.

haven't seen you post for awhile so,
I hope you're still around and that the offer is still good.
Thanks
=^^= DM




"Bill Jr" <bill@nospam.usa2net.net> wrote in message
news:pRWFb.67675$Dt6.1659301@twister.tampabay.rr.com...
BFriedl,

The other posts are accurate.
The anode connector simply removes from the flyback and the HV is reduced
within about 10-20 seconds.
Sounds like the 2SD1556 H.O.T. is toast.
Usually caused by 130 volt B+ going over voltage.
The power supply will probably be the culprit, after you replace the
H.O.T.
While you have the deflection board out, replace C5002 (always), both
100uf
and 2200uf caps in the vertical circuit, the LA7838, the 1uf 200 volt cap
off the horiz driver supply, and any other electrolytics that look
suspect.
Don't forget to clean all the black goo off the board.
Then replace the caps in the primary of the both SMPS as well as the 270k
resistors (R903, R914 with 1/4 watt versions), increase R918 to a 1k 1/2
watt resistor, and do a light bulb test on the 130 volt line for
regulation.
It is best to disable the second SMPS (IC901 circuit by removing L904
while
doing this test.


Good Luck,
Bill Jr


"David" <dkuhajda@locl.net.spam> wrote in message
news:3fe7b7df@news.greennet.net...
Anode wire comes out of flyback if I remember correctly.

BFriedl <junk-remove-@bfriedl.com> wrote in message
news:OPLFb.21490$J77.3504@fed1read07...
Bill Jr and group,
I found a short on the control board's B+ connector in this VS-6015
mits
v10 set. Problem is, I cant get board out because of anode wire. Do I
have to disconnect anode from all three guns to get this thing out to
test, or can I just cut the wire and install a connector or solder it
back together when im done? Doesnt seem the latter is a good idea
though, with kV going though it. Need to get this board on my bench so
I
can find why B+ has 1.2 ohms resistance to ground on connector PA.

PS. Set been off for 2 weeks...any HV left?
PPS..Is the HV stored in the tube or the flyback?

--
BFriedl
A+ Certified Technician
AIM: UACybercat
** Bear Down Arizona! **
******* Go Cats! *******
Click to expand...
 
Dave,
The offer is still good.
I'll locate the fiche today and get back to you.

Bill Jr


"Dave Moore" <novalves@CRUDspamdatasync.com> wrote in message
news:bt7stt$dun$1@news.datasync.com...
Hi Bill.
Awhile back you mentioned that you might have
the ufiche service manual for a Zenith PTV PVR4663RK

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&selm=Mkkqb.10549%24jW5.226875%40twister.tampabay.rr.com

Turns out that the schematic that was sent
to me was the wrong one. It was for a 27" model
that was very similar, but of course, the convergence
section is radically different. No surprises there.

I tried to email about this but may letter bounced back,
even with the nospam removed.

haven't seen you post for awhile so,
I hope you're still around and that the offer is still good.
Thanks
=^^= DM




"Bill Jr" <bill@nospam.usa2net.net> wrote in message
news:pRWFb.67675$Dt6.1659301@twister.tampabay.rr.com...
BFriedl,

The other posts are accurate.
The anode connector simply removes from the flyback and the HV is
reduced
within about 10-20 seconds.
Sounds like the 2SD1556 H.O.T. is toast.
Usually caused by 130 volt B+ going over voltage.
The power supply will probably be the culprit, after you replace the
H.O.T.
While you have the deflection board out, replace C5002 (always), both
100uf
and 2200uf caps in the vertical circuit, the LA7838, the 1uf 200 volt
cap
off the horiz driver supply, and any other electrolytics that look
suspect.
Don't forget to clean all the black goo off the board.
Then replace the caps in the primary of the both SMPS as well as the
270k
resistors (R903, R914 with 1/4 watt versions), increase R918 to a 1k 1/2
watt resistor, and do a light bulb test on the 130 volt line for
regulation.
It is best to disable the second SMPS (IC901 circuit by removing L904
while
doing this test.


Good Luck,
Bill Jr


"David" <dkuhajda@locl.net.spam> wrote in message
news:3fe7b7df@news.greennet.net...
Anode wire comes out of flyback if I remember correctly.

BFriedl <junk-remove-@bfriedl.com> wrote in message
news:OPLFb.21490$J77.3504@fed1read07...
Bill Jr and group,
I found a short on the control board's B+ connector in this VS-6015
mits
v10 set. Problem is, I cant get board out because of anode wire. Do
I
have to disconnect anode from all three guns to get this thing out
to
test, or can I just cut the wire and install a connector or solder
it
back together when im done? Doesnt seem the latter is a good idea
though, with kV going though it. Need to get this board on my bench
so
I
can find why B+ has 1.2 ohms resistance to ground on connector PA.

PS. Set been off for 2 weeks...any HV left?
PPS..Is the HV stored in the tube or the flyback?

--
BFriedl
A+ Certified Technician
AIM: UACybercat
** Bear Down Arizona! **
******* Go Cats! *******
Click to expand...
 
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