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


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)
>> >
>> >
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