Sony RA-1 KP-46S25 "horizontal blinds" but NOT scrolling-hel

4

427Cobra

Guest
Hi all. Hope someone out there can help me out a bit. First the
picture:
http://home.earthlink.net/~fiveliter8/tvrepair/paring.jpg
Sound is perfect and colors are fair. The distortion does NOT "roll"
and if you look hard there are visible scan lines in an arc at the
bottom of the screen. All colors are equally affected. I checked the
horizontal drive on the "A" board and base signal looks good (manual
calls for 2.3Vpp) and 64Vpp out (manual calls for 144Vpp?). The
service manual I have is for "V" series (KP-46V25)but has the same
chassis layout (RA-1). The picture looks like this with or without
video signal (AUX, ANT, RCA, etc.) so I'm ruling out this area. The
manual I have is missing the "M" board waveforms so I'm not sure what
to look for there. Any ideas? Thanks,
Alex
 
Troubleshoot the Vcc 15v and Vdd-15v supplies to the vertical output and
convergence circuits first, then the vertical output ic, then the jungle ic.
Then there is a possibliity eeprom data is corrupted going to the vertical
section of the jungle ic.

David

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0404281428.3fd20ea1@posting.google.com...
Hi all. Hope someone out there can help me out a bit. First the
picture:
http://home.earthlink.net/~fiveliter8/tvrepair/paring.jpg
Sound is perfect and colors are fair. The distortion does NOT "roll"
and if you look hard there are visible scan lines in an arc at the
bottom of the screen. All colors are equally affected. I checked the
horizontal drive on the "A" board and base signal looks good (manual
calls for 2.3Vpp) and 64Vpp out (manual calls for 144Vpp?). The
service manual I have is for "V" series (KP-46V25)but has the same
chassis layout (RA-1). The picture looks like this with or without
video signal (AUX, ANT, RCA, etc.) so I'm ruling out this area. The
manual I have is missing the "M" board waveforms so I'm not sure what
to look for there. Any ideas? Thanks,
Alex
Click to expand...
 
David,
Thanks for your input. I just learned this thing uses a "switched
mode" power supply that has electolytics that go bad. It could very
well be one the +/-15VDC lines. I sure hope it is caps! I'll post an
update. Thanks for the quick response!
Alex

"David" <dkuhajda@locl.net.spam> wrote in message news:<40905926@news.greennet.net>...
Troubleshoot the Vcc 15v and Vdd-15v supplies to the vertical output and
convergence circuits first, then the vertical output ic, then the jungle ic.
Then there is a possibliity eeprom data is corrupted going to the vertical
section of the jungle ic.

David

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0404281428.3fd20ea1@posting.google.com...
Hi all. Hope someone out there can help me out a bit. First the
picture:
http://home.earthlink.net/~fiveliter8/tvrepair/paring.jpg
Sound is perfect and colors are fair. The distortion does NOT "roll"
and if you look hard there are visible scan lines in an arc at the
bottom of the screen. All colors are equally affected. I checked the
horizontal drive on the "A" board and base signal looks good (manual
calls for 2.3Vpp) and 64Vpp out (manual calls for 144Vpp?). The
service manual I have is for "V" series (KP-46V25)but has the same
chassis layout (RA-1). The picture looks like this with or without
video signal (AUX, ANT, RCA, etc.) so I'm ruling out this area. The
manual I have is missing the "M" board waveforms so I'm not sure what
to look for there. Any ideas? Thanks,
Alex
Click to expand...
 
Ok,
All Vert IC voltages look good. However, the waveform is literally
"all over the place" on PIN 5 (IC1501) which is the VDeflection
signal. Interestingly, the Vret has a nice sawtooth with a tad of
ripple at the peaks. Scratching my head on this one.

Alex

"David" <dkuhajda@locl.net.spam> wrote in message news:<40905926@news.greennet.net>...
Troubleshoot the Vcc 15v and Vdd-15v supplies to the vertical output and
convergence circuits first, then the vertical output ic, then the jungle ic.
Then there is a possibliity eeprom data is corrupted going to the vertical
section of the jungle ic.

David

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0404281428.3fd20ea1@posting.google.com...
Hi all. Hope someone out there can help me out a bit. First the
picture:
http://home.earthlink.net/~fiveliter8/tvrepair/paring.jpg
Sound is perfect and colors are fair. The distortion does NOT "roll"
and if you look hard there are visible scan lines in an arc at the
bottom of the screen. All colors are equally affected. I checked the
horizontal drive on the "A" board and base signal looks good (manual
calls for 2.3Vpp) and 64Vpp out (manual calls for 144Vpp?). The
service manual I have is for "V" series (KP-46V25)but has the same
chassis layout (RA-1). The picture looks like this with or without
video signal (AUX, ANT, RCA, etc.) so I'm ruling out this area. The
manual I have is missing the "M" board waveforms so I'm not sure what
to look for there. Any ideas? Thanks,
Alex
Click to expand...
 
Is the ripple on the +/-15v supplies to IC501? Likely a bad cap on one of
those supplies.

Leonard

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0405040813.1f2458f6@posting.google.com...
Ok,
All Vert IC voltages look good. However, the waveform is literally
"all over the place" on PIN 5 (IC1501) which is the VDeflection
signal. Interestingly, the Vret has a nice sawtooth with a tad of
ripple at the peaks. Scratching my head on this one.

Alex

"David" <dkuhajda@locl.net.spam> wrote in message
news:<40905926@news.greennet.net>...
Troubleshoot the Vcc 15v and Vdd-15v supplies to the vertical output and
convergence circuits first, then the vertical output ic, then the jungle
ic.
Then there is a possibliity eeprom data is corrupted going to the
vertical
section of the jungle ic.

David

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0404281428.3fd20ea1@posting.google.com...
Hi all. Hope someone out there can help me out a bit. First the
picture:
http://home.earthlink.net/~fiveliter8/tvrepair/paring.jpg
Sound is perfect and colors are fair. The distortion does NOT "roll"
and if you look hard there are visible scan lines in an arc at the
bottom of the screen. All colors are equally affected. I checked the
horizontal drive on the "A" board and base signal looks good (manual
calls for 2.3Vpp) and 64Vpp out (manual calls for 144Vpp?). The
service manual I have is for "V" series (KP-46V25)but has the same
chassis layout (RA-1). The picture looks like this with or without
video signal (AUX, ANT, RCA, etc.) so I'm ruling out this area. The
manual I have is missing the "M" board waveforms so I'm not sure what
to look for there. Any ideas? Thanks,
Alex
Click to expand...
 
Finally got back to work on this unit.
I scoped all the DC voltages and they are clean and ripple-free. I
started checking the parabolic and convergence (V) ckts and found some
odd waveforms. Referring to the diagram here:
http://home.earthlink.net/~fiveliter8/tvrepair/waveform.gif (please,
please excuse my "artistry") the waveform (FIG 1) is found at the
V-Wave GEN IC1806 pin 6 (V-para) and convergence correction IC's
1801,1805, and 1809 pins 6 and 12. The figure depicts incomplete
arches in the waveform. The waveform in FIG 2 (should be a nice sine
wave) is found at IC1806 pin 7 (V-sin). Vout on pin 30 of the Jungle
IC301 looks like FIG 3 waveform. Defined sawtooth with barely visible
ripple. I've swapped IC1806 with a known good one with the same
results. I just ordered the DS ESR meter kit, so I can tackle these
caps easier. Please forgive my ignorance. I'm self teaching myself
all this (along with the help of wonderful folks like yourself!) and
this has been the toughest one yet! What is a good source for parts,
should I need to replace IC301 (CXA1477AS)? Thanks,
Alex

"Leonard G. Caillouet" <lcaillo_ns_@devoynet.com> wrote in message news:<PfQlc.871$cb.146@bignews1.bellsouth.net>...
Is the ripple on the +/-15v supplies to IC501? Likely a bad cap on one of
those supplies.

Leonard

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0405040813.1f2458f6@posting.google.com...
Ok,
All Vert IC voltages look good. However, the waveform is literally
"all over the place" on PIN 5 (IC1501) which is the VDeflection
signal. Interestingly, the Vret has a nice sawtooth with a tad of
ripple at the peaks. Scratching my head on this one.

Alex

"David" <dkuhajda@locl.net.spam> wrote in message
news:<40905926@news.greennet.net>...
Troubleshoot the Vcc 15v and Vdd-15v supplies to the vertical output and
convergence circuits first, then the vertical output ic, then the jungle
ic.
Then there is a possibliity eeprom data is corrupted going to the
vertical
section of the jungle ic.

David

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0404281428.3fd20ea1@posting.google.com...
Hi all. Hope someone out there can help me out a bit. First the
picture:
http://home.earthlink.net/~fiveliter8/tvrepair/paring.jpg
Sound is perfect and colors are fair. The distortion does NOT "roll"
and if you look hard there are visible scan lines in an arc at the
bottom of the screen. All colors are equally affected. I checked the
horizontal drive on the "A" board and base signal looks good (manual
calls for 2.3Vpp) and 64Vpp out (manual calls for 144Vpp?). The
service manual I have is for "V" series (KP-46V25)but has the same
chassis layout (RA-1). The picture looks like this with or without
video signal (AUX, ANT, RCA, etc.) so I'm ruling out this area. The
manual I have is missing the "M" board waveforms so I'm not sure what
to look for there. Any ideas? Thanks,
Alex
Click to expand...
 
Yes,
You should definitely replace that CXA1477AS

Good Luck,
Bill Jr


"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0405150834.d2ed83e@posting.google.com...
Finally got back to work on this unit.
I scoped all the DC voltages and they are clean and ripple-free. I
started checking the parabolic and convergence (V) ckts and found some
odd waveforms. Referring to the diagram here:
http://home.earthlink.net/~fiveliter8/tvrepair/waveform.gif (please,
please excuse my "artistry") the waveform (FIG 1) is found at the
V-Wave GEN IC1806 pin 6 (V-para) and convergence correction IC's
1801,1805, and 1809 pins 6 and 12. The figure depicts incomplete
arches in the waveform. The waveform in FIG 2 (should be a nice sine
wave) is found at IC1806 pin 7 (V-sin). Vout on pin 30 of the Jungle
IC301 looks like FIG 3 waveform. Defined sawtooth with barely visible
ripple. I've swapped IC1806 with a known good one with the same
results. I just ordered the DS ESR meter kit, so I can tackle these
caps easier. Please forgive my ignorance. I'm self teaching myself
all this (along with the help of wonderful folks like yourself!) and
this has been the toughest one yet! What is a good source for parts,
should I need to replace IC301 (CXA1477AS)? Thanks,
Alex

"Leonard G. Caillouet" <lcaillo_ns_@devoynet.com> wrote in message
news:<PfQlc.871$cb.146@bignews1.bellsouth.net>...
Is the ripple on the +/-15v supplies to IC501? Likely a bad cap on one
of
those supplies.

Leonard

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0405040813.1f2458f6@posting.google.com...
Ok,
All Vert IC voltages look good. However, the waveform is literally
"all over the place" on PIN 5 (IC1501) which is the VDeflection
signal. Interestingly, the Vret has a nice sawtooth with a tad of
ripple at the peaks. Scratching my head on this one.

Alex

"David" <dkuhajda@locl.net.spam> wrote in message
news:<40905926@news.greennet.net>...
Troubleshoot the Vcc 15v and Vdd-15v supplies to the vertical output
and
convergence circuits first, then the vertical output ic, then the
jungle
ic.
Then there is a possibliity eeprom data is corrupted going to the
vertical
section of the jungle ic.

David

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0404281428.3fd20ea1@posting.google.com...
Hi all. Hope someone out there can help me out a bit. First the
picture:
http://home.earthlink.net/~fiveliter8/tvrepair/paring.jpg
Sound is perfect and colors are fair. The distortion does NOT
"roll"
and if you look hard there are visible scan lines in an arc at the
bottom of the screen. All colors are equally affected. I checked
the
horizontal drive on the "A" board and base signal looks good
(manual
calls for 2.3Vpp) and 64Vpp out (manual calls for 144Vpp?). The
service manual I have is for "V" series (KP-46V25)but has the same
chassis layout (RA-1). The picture looks like this with or
without
video signal (AUX, ANT, RCA, etc.) so I'm ruling out this area.
The
manual I have is missing the "M" board waveforms so I'm not sure
what
to look for there. Any ideas? Thanks,
Alex
Click to expand...
 
Well, it sure was the Jungle ic. Put a new one in and it works great!
Just need to focus it and will be good as new. Many thanks to all
who put up with all my questions and guided me on my first rear
projection TV set repair.
Alex
"Bill Jr" <bill@nospam.usa2net.net> wrote in message news:<I6spc.554162$B81.10648490@twister.tampabay.rr.com>...
Yes,
You should definitely replace that CXA1477AS

Good Luck,
Bill Jr


"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0405150834.d2ed83e@posting.google.com...
Finally got back to work on this unit.
I scoped all the DC voltages and they are clean and ripple-free. I
started checking the parabolic and convergence (V) ckts and found some
odd waveforms. Referring to the diagram here:
http://home.earthlink.net/~fiveliter8/tvrepair/waveform.gif (please,
please excuse my "artistry") the waveform (FIG 1) is found at the
V-Wave GEN IC1806 pin 6 (V-para) and convergence correction IC's
1801,1805, and 1809 pins 6 and 12. The figure depicts incomplete
arches in the waveform. The waveform in FIG 2 (should be a nice sine
wave) is found at IC1806 pin 7 (V-sin). Vout on pin 30 of the Jungle
IC301 looks like FIG 3 waveform. Defined sawtooth with barely visible
ripple. I've swapped IC1806 with a known good one with the same
results. I just ordered the DS ESR meter kit, so I can tackle these
caps easier. Please forgive my ignorance. I'm self teaching myself
all this (along with the help of wonderful folks like yourself!) and
this has been the toughest one yet! What is a good source for parts,
should I need to replace IC301 (CXA1477AS)? Thanks,
Alex

"Leonard G. Caillouet" <lcaillo_ns_@devoynet.com> wrote in message
news:<PfQlc.871$cb.146@bignews1.bellsouth.net>...
Is the ripple on the +/-15v supplies to IC501? Likely a bad cap on one
of
those supplies.

Leonard

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0405040813.1f2458f6@posting.google.com...
Ok,
All Vert IC voltages look good. However, the waveform is literally
"all over the place" on PIN 5 (IC1501) which is the VDeflection
signal. Interestingly, the Vret has a nice sawtooth with a tad of
ripple at the peaks. Scratching my head on this one.

Alex

"David" <dkuhajda@locl.net.spam> wrote in message
news:<40905926@news.greennet.net>...
Troubleshoot the Vcc 15v and Vdd-15v supplies to the vertical output
and
convergence circuits first, then the vertical output ic, then the
jungle
ic.
Then there is a possibliity eeprom data is corrupted going to the
vertical
section of the jungle ic.

David

"427Cobra" <quartermiler1320@yahoo.com> wrote in message
news:ff4b1484.0404281428.3fd20ea1@posting.google.com...
Hi all. Hope someone out there can help me out a bit. First the
picture:
http://home.earthlink.net/~fiveliter8/tvrepair/paring.jpg
Sound is perfect and colors are fair. The distortion does NOT
"roll"
and if you look hard there are visible scan lines in an arc at the
bottom of the screen. All colors are equally affected. I checked
the
horizontal drive on the "A" board and base signal looks good
(manual
calls for 2.3Vpp) and 64Vpp out (manual calls for 144Vpp?). The
service manual I have is for "V" series (KP-46V25)but has the same
chassis layout (RA-1). The picture looks like this with or
without
video signal (AUX, ANT, RCA, etc.) so I'm ruling out this area.
The
manual I have is missing the "M" board waveforms so I'm not sure
what
to look for there. Any ideas? Thanks,
Alex
Click to expand...
 
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