[TechAssist] Re: Panasonic CT36G22V chas APEDP288 pwr supl prob

  • From: Al Gutz <alg@xxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Tue, 15 Jul 2003 22:50:17 -0400

That type of waveform on a sw power supply normally indicates a short
somewhere on the secondary side.

Al G

jhoeme@xxxxxxxxxxxxx wrote:
> 
> This set came in with shorted HOT.  To chk pwr supply used 40W light bulb as 
> dummy load, but puts out only about 12V and makes a growling sound.  I have 
> replaced IC803, C820, C815, R822, T801, Q801, Q802, D823, R827 even tho they 
> all checked good. D825 checks good.  Nothing is shorted on load side of PS.
> Waveform at pin 4 of IC803 looks like
> |||           |||
> |||           |||
> |||           |||
> |||||||||||||||||||||||||||||
> 
> and is only about 200V P-P
> Anyone seen this before?
> TIA
> Jerry Hoeme
> Jerry's TV Service
> 840 S. Kansas Ave
> Liberal, KS 67901
> jhoeme@xxxxxxxxxxxxx
> *****************************************************************************
> CHECK OUT THE NEW CHATROOM! Just login and click on chat!
> http://www.tech-assist.org/secure/tip/main.htm
> The Tech Address Book:
> http://www.tech-assist.org/secure/tip/contact.htm
> Add a Repair Tip Here, or Change/Remove your Email Address:
> http://www.tech-assist.org/secure/tip/main.htm
> Lost Password:
> http://www.tech-assist.org  and select "Lost your Login Info?".
> Email Archives:
> //www.freelists.org/archives/techassist/

*****************************************************************************
CHECK OUT THE NEW CHATROOM! Just login and click on chat!
http://www.tech-assist.org/secure/tip/main.htm
The Tech Address Book:
http://www.tech-assist.org/secure/tip/contact.htm
Add a Repair Tip Here, or Change/Remove your Email Address:
http://www.tech-assist.org/secure/tip/main.htm
Lost Password:
http://www.tech-assist.org  and select "Lost your Login Info?".
Email Archives:
//www.freelists.org/archives/techassist/

Other related posts: