[TechAssist] Re: Sony KV27S20 AA2 blows Q601 & Q602

C615 was ok on my BK 830  but D648 was shorted, tried repleament stack (140v 
+ 10v)  but shorted instanly (the 140 not the 10) will need to order sony 
part. but may have more problems

Peter Oliver
Tucson Radio TV


From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: <techassist@xxxxxxxxxxxxx>
Subject: [TechAssist] Re: Sony KV27S20 AA2 blows Q601 & Q602
Date: Tue, 25 Nov 2003 07:11:04 -0500

First,
Disconnect the power supply "G" board from the "A" board. See if C615, D648
(150 volt zener), and primary of T603 are okay. Here is a link to some
useful procedures for Sony power supply troubleshooting:

http://www.iwaynet.net/~nesda/SonyPowSupply.html

Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com


----- Original Message -----
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, November 24, 2003 10:14 PM
Subject: [TechAssist] Sony KV27S20 AA2 blows Q601 & Q602


 > Sony
 > KV20S20
 > AA2
 > MFD 1996 (main chassis with seprate power supply board, discrete
components,
 > Dampered HOT)
 >
 >         Set was brought in as a Military Shipping Damage Claim. Found 
Q601
&
 > Q602 shorted, R607 open, No apparent cracks on board or visble trama to
the
 > set. The HOT seemed to be ok although it read 12 ohm B-E out of circuit
 > (accross damper network) (tried repacing it just in case no help), VDR601
 > reads as open, C609, C610, C611, C612 read within tolleance on a BK 830
 > capacitace meter. Main filter caps test ok, and output voltage off main
full
 > wave recifier is ok. When set is pluged in will instantly blow Q601 & 
Q602
 > (2SC4834 M) and opens R607. Does not even get as far as fluxing up the 
HV.
 > The VDR601 1-810-974-11 is a mashushita ZNR V10431U according to its
 > markings (any one know if the Digikey part # P7257-ND is the same thing,
it
 > is only $0.37 where as the Tritronics list on the 1-810-974-21 is $9.09 
in
 > the sony packaging or even NTE 2V275 10mm?) [ I have the PDF's for the 
AA2
 > Chassis from sony and the Sams for the 32S20]
 >
 >   I am thinking on the following lines:
 > 1. VDR601 was damaged and is activating at an erronously low volatge
causing
 > power supply failure either from an intrinsic time related fault or  from
 > being inadvertantly connected to 220v while on travel.
 > 2. additonal componet faults causing failure
 > 3. hidden shipping related damage not easily detetable (CRT ? But don't
even
 > hear or feel the osc start)
 >
 > Peter Oliver
 > Tucson Radio TV
 >
 > _________________________________________________________________
 > Gift-shop online from the comfort of home at MSN Shopping!  No crowds,
free
 > parking.  http://shopping.msn.com
 >
 >
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