[TechAssist] Re: CTC185 Temp!

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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