KV27V22 Sound No Picture

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I have a KV27V22 (Chassis SCC-K96R-A) which turns on with sound, led
blinks on front, but no video. Sometimes the set will play for a few
minutes and then go blank with sound. It acts like the high voltage is
not getting to the right level (haven't checked the +135 yet). Possibly
a bad electrolytic in the power supply ? Seems like a common problem,
has anybody seen this before ? Any help would be appreciated.
 
Do a Google groups search for Sony blanking video, AKB, etc for lots of
hints regarding all the different causes for no video but sound on a Sony.
Odds are the problem is NOT in the HV circuit. The fact that you have sound
indicates that the B+ and flyback are all running. The system control would
shut the set down if the h return pulses were missing to it.

David

"nospam" <nospam@nospam.com> wrote in message
news:8d5bc6fb0f6e873f78e55b5f6dd0877f@news.teranews.com...
I have a KV27V22 (Chassis SCC-K96R-A) which turns on with sound, led
blinks on front, but no video. Sometimes the set will play for a few
minutes and then go blank with sound. It acts like the high voltage is
not getting to the right level (haven't checked the +135 yet). Possibly
a bad electrolytic in the power supply ? Seems like a common problem,
has anybody seen this before ? Any help would be appreciated.
Click to expand...
 
Possible video output.
"nospam" <nospam@nospam.com> wrote in message
news:8d5bc6fb0f6e873f78e55b5f6dd0877f@news.teranews.com...
I have a KV27V22 (Chassis SCC-K96R-A) which turns on with sound, led
blinks on front, but no video. Sometimes the set will play for a few
minutes and then go blank with sound. It acts like the high voltage is
not getting to the right level (haven't checked the +135 yet). Possibly
a bad electrolytic in the power supply ? Seems like a common problem,
has anybody seen this before ? Any help would be appreciated.
Click to expand...
 
I turned the set on this morning and the picture was there for about a minute,
then compressed to about 1/4 screen from the top, then went away. It looks like
it is in the vertical circuitry, possibly a bad cap or solder connection.
Comments ?

David wrote:

Do a Google groups search for Sony blanking video, AKB, etc for lots of
hints regarding all the different causes for no video but sound on a Sony.
Odds are the problem is NOT in the HV circuit. The fact that you have sound
indicates that the B+ and flyback are all running. The system control would
shut the set down if the h return pulses were missing to it.

David

"nospam" <nospam@nospam.com> wrote in message
news:8d5bc6fb0f6e873f78e55b5f6dd0877f@news.teranews.com...
I have a KV27V22 (Chassis SCC-K96R-A) which turns on with sound, led
blinks on front, but no video. Sometimes the set will play for a few
minutes and then go blank with sound. It acts like the high voltage is
not getting to the right level (haven't checked the +135 yet). Possibly
a bad electrolytic in the power supply ? Seems like a common problem,
has anybody seen this before ? Any help would be appreciated.
Click to expand...
 
At least you know what to troubleshoot. Yes, any of the possibilities have
been seen.
David

"nospam" <nospam@nospam.com> wrote in message
news:1cac339bce6291ddec1085d051281fee@news.teranews.com...
I turned the set on this morning and the picture was there for about a
minute,
then compressed to about 1/4 screen from the top, then went away. It
looks like
it is in the vertical circuitry, possibly a bad cap or solder connection.
Comments ?

David wrote:

Do a Google groups search for Sony blanking video, AKB, etc for lots of
hints regarding all the different causes for no video but sound on a
Sony.
Odds are the problem is NOT in the HV circuit. The fact that you have
sound
indicates that the B+ and flyback are all running. The system control
would
shut the set down if the h return pulses were missing to it.

David

"nospam" <nospam@nospam.com> wrote in message
news:8d5bc6fb0f6e873f78e55b5f6dd0877f@news.teranews.com...
I have a KV27V22 (Chassis SCC-K96R-A) which turns on with sound, led
blinks on front, but no video. Sometimes the set will play for a few
minutes and then go blank with sound. It acts like the high voltage
is
not getting to the right level (haven't checked the +135 yet).
Possibly
a bad electrolytic in the power supply ? Seems like a common problem,
has anybody seen this before ? Any help would be appreciated.
Click to expand...
 
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