Panasonic TV model CT27G30T, Ch. AMEDP24B, 730-020 runs hot

L

Lenny

Guest
I found the original 730-020 shorted. I replaced it and I checked
diodes around the chip for shorts or leakage and they seemed ok. Noted
nothing else blatantly suspicious so I fired up the set. It works
great but the regulator heat sink is too hot to keep a finger on after
about 10 minutes. Maybe this is normal but I'm concerned. Anyone have
any further insight on this set?
Thanks, Lenny Stein, Barlen Electronics.
 
It would be best to check the temperature with a contact type K , or laser
thermometer. If the temperature of the device is more than about 70 deg
Cels with the back cover on the set, then I would worry about it. These
devices generally run on the hot side. Most of them can tolerate up to
about 90 to 100 deg Cels, but this is very near to the edge of their specs.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Lenny" <captainvideo462002@yahoo.com> wrote in message
news:d980bc2c.0312272046.616f5f1e@posting.google.com...
I found the original 730-020 shorted. I replaced it and I checked
diodes around the chip for shorts or leakage and they seemed ok. Noted
nothing else blatantly suspicious so I fired up the set. It works
great but the regulator heat sink is too hot to keep a finger on after
about 10 minutes. Maybe this is normal but I'm concerned. Anyone have
any further insight on this set?
Thanks, Lenny Stein, Barlen Electronics.
 
I was told by a fellow tech on another NG that there may be problems
associated with using generic replacements for these chips. I remember
when I ordered two of these some time ago for an RCA, the jobber asked
me if I wanted original Panasonic or generic. Figuring that for an RCA
it wouldn't matter if I used a generic, I ordered one generic for that
set and an extra for a spare. I never heard from the RCA customer
again but who knows. I recall at the time that the Panasonics were a
lot more money than the 6.95 I paid for these. But he tells me that
generics "will not work" in these Panasonics. Does he mean they will
just plain not work or that as mine seems to they may work, run hotter
than hell and then fail shortly thereafter? Could I expect the
original Panasonic part to run cooler or would it likely run at the
same temperature but withstand the heat better?
Thanks, Lenny Stein, Barlen Electronics
"Jerry G." <jerryg50@hotmail.com> wrote in message news:<bslnr0$qgo$1@news.eusc.inter.net>...
It would be best to check the temperature with a contact type K , or laser
thermometer. If the temperature of the device is more than about 70 deg
Cels with the back cover on the set, then I would worry about it. These
devices generally run on the hot side. Most of them can tolerate up to
about 90 to 100 deg Cels, but this is very near to the edge of their specs.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Lenny" <captainvideo462002@yahoo.com> wrote in message
news:d980bc2c.0312272046.616f5f1e@posting.google.com...
I found the original 730-020 shorted. I replaced it and I checked
diodes around the chip for shorts or leakage and they seemed ok. Noted
nothing else blatantly suspicious so I fired up the set. It works
great but the regulator heat sink is too hot to keep a finger on after
about 10 minutes. Maybe this is normal but I'm concerned. Anyone have
any further insight on this set?
Thanks, Lenny Stein, Barlen Electronics.
Click to expand...
 
Just as another followup, I went on to Sanyo's website and looked at
spec sheets for the STK 730 series. I noticed that there are -30, -40,
and -50 versions of these chips, all which seem to have higher power
disipation specs. Would one of those possibly be a better choice for a
replacement for the -20?
Thanks, Lenny Stein, Barlen Electronics.
"Jerry G." <jerryg50@hotmail.com> wrote in message news:<bslnr0$qgo$1@news.eusc.inter.net>...
It would be best to check the temperature with a contact type K , or laser
thermometer. If the temperature of the device is more than about 70 deg
Cels with the back cover on the set, then I would worry about it. These
devices generally run on the hot side. Most of them can tolerate up to
about 90 to 100 deg Cels, but this is very near to the edge of their specs.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Lenny" <captainvideo462002@yahoo.com> wrote in message
news:d980bc2c.0312272046.616f5f1e@posting.google.com...
I found the original 730-020 shorted. I replaced it and I checked
diodes around the chip for shorts or leakage and they seemed ok. Noted
nothing else blatantly suspicious so I fired up the set. It works
great but the regulator heat sink is too hot to keep a finger on after
about 10 minutes. Maybe this is normal but I'm concerned. Anyone have
any further insight on this set?
Thanks, Lenny Stein, Barlen Electronics.
Click to expand...
 
Any of them will work. If you're worried, get the exact Panasonic -20, but it
runs about $20 verses $6 for generic. The chips get hot, that's why they fail.
I'd just send it out, and if it come's back you know it wasn't right :) "Fix
it on a reservice", as my old boss used to say.

Just as another followup, I went on to Sanyo's website and looked at
spec sheets for the STK 730 series. I noticed that there are -30, -40,
and -50 versions of these chips, all which seem to have higher power
disipation specs. Would one of those possibly be a better choice for a
Click to expand...
 
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