[TechAssist] Re: CTC185 Temp!
- From: John Mielke <maintv2002@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 04 Nov 2002 13:34:36 -0700
The contact type reads about 10 degrees higher than the infra-red type
but I do not know which is correct. But it is helpful for comparison
purposes. I think about 150 degree is the hottest you can hold your
finger on without much pain and 165 will burn your finger. With the
contact type I put a drop of heatsink compound on the tip to help the
heat transfer. You must hold it on for about 30 seconds to get the
reading where the infra-red is instantaneous. I test them all with the
TV on.(Not a problem with the infra-red type) A heatsink will cool 20
degree in 1 minute when turned off. Either costs about $100 to $125.
It is better to read the heat sink and not the transistor itself, that
is usually hotter, the plastic part of the transistor does not transfer
heat well. I test them all the same, warmed up for at least 15 minutes
with a normal picture and with the back off. It seems like the newer
sets are running the transistors hotter than before.
John.
Kevin wrote:
> John,
>
> I wondered about that, but can you monitor a TV as it warms up, or do
> you have to check it yourself every time? How much did the temperature
> vary with the contact type digital? Your finger is also a good test--as
> long as the TV is unplugged! Experience tells you when it is too hot
> using the finger method! No pun intended!
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevinstv@xxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of John Mielke
> Sent: Monday, November 04, 2002 8:53 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: CTC185 Temp!
>
>
> Good morning. My notes show the PS heat sink runs quite warm. I have
> measured 155 degree F on an apparently good TV. I use an infra-red
> thermometer which gives repeatable readings of the transistor or the
> heat sink. I have also used contact type digital thermometer which
> gives a quite different reading and also varies depending on where you
> place it and how good the contact is. John.
>
>
> Kevin wrote:
>
>>Above 150 degrees F is probably too high. I have had Sony's go up to
>>150 degrees F and been "OK". What type of temperature test equipment
>>are you using? I'm using a radio shack digital thermometer with an
>>alligator clip glued to the outside temperature probe. I then clip
>
> the
>
>>probe on to the heat sink as close to the transistor as possible. The
>>heat sink can get quite hot compared to the transistor itself.
>>
>>Kevin Wilks
>>Kevin's TV & Video Repair
>>Penticton BC Canada
>>kevinstv@xxxxxxx
>>
>>
>>-----Original Message-----
>>From: techassist-bounce@xxxxxxxxxxxxx
>>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of
>>Hermantvr@xxxxxxxxxxxxx
>>Sent: Sunday, November 03, 2002 6:14 PM
>>To: techassist@xxxxxxxxxxxxx
>>Subject: [TechAssist] CTC185 Temp!
>>
>>
>>Just finished a CTC 185. Rebuilt the Power Supply with suggested kit.
>>Heat
>>shields seem too hot. Replaced multiple components which helped but
>>still
>>seems a little warm. Would some of you guys that have temperature test
>
>
>>equipment check the temperature of the heat sinks on the CTC185 and
>
> send
>
>>either me personally or the group your results. Just purchased
>>temperature
>>test equipment and want to start a data base for some of these
>
> chassis.
>
>>The
>>reason for the CTC185 is because of the way they use a winding in the
>>FBT to
>>feed the regulator. Thanks!
>>
>>Tommy R Herman
>>250 School Ave SW
>>Taylorsville, NC 28681
>>828-632-5322 voice
>>828-632-3880 fax
>>hermantvr@xxxxxxxxxxxxx
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>
>
>
--
John Mielke
Main TV
Longmont,Co
303 776 6955
maintv2002@xxxxxxxxxxxxx
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