[TechAssist] Re: Sony KV27TS27, Blows regulators Q601 & Q602

We had about same set (32')  KV32S25  Sony--same power sup.---kept 
blowing Q601-602--found following parts bad--now running ok---C609, C610 
both  0.47uf, all diodes D603 to 610  NTE519, bad resistors R616, 617, 
609, 610  all 22 ohm 1/4 watt, open R607 -AND look for shorted D648 
diode on B+ output  (I put in a 150v avalance diode)--also don't use 
cheap transistors for Q601-602!

Hugh
Main TV

Vilhelm Boor wrote:

>Villy Boor
>Boorelec Durban 
>--
>If the transistor is getting hot it is usually drive causing it, have a close 
>look at your drive waveform, may be the jungle IC. Tip if the output 
>transistor is expensive dont test with a new one as you can loose 2 much on 
>blow ups. Use 2 cheap say BU508AF paralleled or DF if required. Takes a lot to 
>blow em up and you see all the wiggles before they get stressed.
>
>On Fri, 30 Aug 2002 09:00:52  
> Lyles Tv wrote:
>  
>
>>Resolder the HDT and replace the cap tied to it--I believe a .47uf 50VDC
>>
>>Jeff Farnsworth
>>Lyles TV and Appliance
>>17 S Washington St
>>Elkhorn, Wi.  53121
>>ph    262-723-3477
>>fax   262-723-3658
>>tech@xxxxxxxxxxx
>>----- Original Message -----
>>From: "Ron Miller" <rlmbkm@xxxxxxxx>
>>To: <techassist@xxxxxxxxxxxxx>
>>Sent: Thursday, August 29, 2002 7:42 PM
>>Subject: [TechAssist] Re: Sony KV27TS27, Blows regulators Q601 & Q602
>>
>>
>>    
>>
>>>Take a close look at the yoke plug, horiz pins sand and recrimp
>>>connector.HTH
>>>Country TV
>>>Ron Miller
>>>484 FM444 S.
>>>Inez,TX 77968-5002
>>>V.(361)782-6419. F.(361)782-9149
>>>e-mail: rlmbkm@xxxxxxxx
>>>
>>>----- Original Message -----
>>>From: <gulftech@xxxxxxxx>
>>>To: <techassist@xxxxxxxxxxxxx>
>>>Sent: Thursday, August 29, 2002 7:23 PM
>>>Subject: [TechAssist] Sony KV27TS27, Blows regulators Q601 & Q602
>>>
>>>
>>>      
>>>
>>>>Techs,
>>>>
>>>>This set has me crying "Uncle."  Found F602, 2.5A fuse blown, Q601 &
>>>>        
>>>>
>>Q602
>>    
>>
>>>>shorted.  Replaced those along with C650 (330@16v), high ESR.  R647,
>>>>D622, C613 & Q613 check good.  Applied power.  After 10-15 seconds, pix
>>>>pulls in on all sides (I think??).  Turned set off.  Regulators were
>>>>        
>>>>
>>very
>>    
>>
>>>>warm.
>>>>
>>>>Rechecked components in area.  Still found nothing amiss, but replaced
>>>>Q613 for good measure (2SC4274).  Reapplied power.  Good pix.  Phone
>>>>rings.  Turn head.  POW!  Back to square one.
>>>>
>>>>Have done many of this sets without a hitch.  The transistors I use are
>>>>Sony originals, carefully checked before installation and again after
>>>>        
>>>>
>>the
>>    
>>
>>>>first trial.  Resoldered the driver transformer for grins.  This set
>>>>        
>>>>
>>does
>>    
>>
>>>>not use the VCR's common to fail on other models.
>>>>
>>>>Any suggestions appreciated,
>>>>
>>>>TIA,
>>>>
>>>>
>>>>Ken Smith
>>>>Gulf Technical Services
>>>>3034 Gulf Breeze Parkway
>>>>Gulf Breeze, FL  32563
>>>>850-934-8324 (Voice) 850-932-0819 (Fax)
>>>>
>>>>
>>>>________________________________________________________________
>>>>GET INTERNET ACCESS FROM JUNO!
>>>>Juno offers FREE or PREMIUM Internet access for less!
>>>>Join Juno today!  For your FREE software, visit:
>>>>http://dl.www.juno.com/get/web/.
>>>>------------------------------------------
>>>>To REMOVE your email address, click here:
>>>>  http://www.tech-assist.org/unsubb.html
>>>>To CHANGE your email address, click here:
>>>>  http://www.tech-assist.org/change.html
>>>>------------------------------------------
>>>>***NEW*** Tips Added Instantly!!!***
>>>>Submit Repair Tips here:
>>>>http://www.tech-assist.org/secure/tip/
>>>>
>>>>
>>>>        
>>>>
>>>------------------------------------------
>>>To REMOVE your email address, click here:
>>>  http://www.tech-assist.org/unsubb.html
>>>To CHANGE your email address, click here:
>>>  http://www.tech-assist.org/change.html
>>>------------------------------------------
>>>***NEW*** Tips Added Instantly!!!***
>>>Submit Repair Tips here:
>>>http://www.tech-assist.org/secure/tip/
>>>
>>>      
>>>
>>------------------------------------------
>>To REMOVE your email address, click here:
>> http://www.tech-assist.org/unsubb.html
>>To CHANGE your email address, click here:
>> http://www.tech-assist.org/change.html
>>------------------------------------------
>>***NEW*** Tips Added Instantly!!!***
>>Submit Repair Tips here: 
>>http://www.tech-assist.org/secure/tip/
>>
>>    
>>
>
>
>___________________________________________________
>Communicate with others using Lycos Mail for FREE!
>http://mail.lycos.com 
>------------------------------------------
>To REMOVE your email address, click here:
>  http://www.tech-assist.org/unsubb.html
>To CHANGE your email address, click here:
>  http://www.techassist.net/forms/change.html
>------------------------------------------
>***NEW*** Tips Added Instantly!!!***
>Submit Repair Tips here: 
>http://www.tech-assist.org/secure/tip/
>
>
>  
>

-- 
Hugh Thornley
Main TV
636 Main St.
Longmont, Colorado 80501
303-776-6955
maintv2002@xxxxxxxxxxxxx




------------------------------------------
To REMOVE your email address, click here:
  http://www.tech-assist.org/unsubb.html
To CHANGE your email address, click here:
  http://www.techassist.net/forms/change.html
------------------------------------------
***NEW*** Tips Added Instantly!!!***
Submit Repair Tips here: 
http://www.tech-assist.org/secure/tip/

Other related posts: