[TechAssist] Re: Sony KV27S20 AA2 blows Q601 & Q602
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 30 Nov 2003 05:53:22 +0000
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
>
> _________________________________________________________________
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