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

If  D648 is shorting then there is no regulation. check for open R661 470
ohm resistor off pin 1 of IC 643.

Tony Saracco
TCS ELECTRONICS
Elgin , IL 60120
847-695-1928
tcselectronics@xxxxxxxxxxxxxxxx
----- Original Message -----
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, November 29, 2003 11:53 PM
Subject: [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,
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