[TechAssist] Re: Phillips 25P1-02 chassis - Model# PK4485 (CH03)
- From: peggs <peggs@xxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, <techassist@xxxxxxxxxxxxx>
- Date: Fri, 13 Dec 2002 07:49:03 -0600
I use a 1 ohm resistor
Peggs
At 11:09 PM 12/12/02 -0500, David Lessard wrote:
>
>Jeff,
>
>Is this the PS diode feeding LA7838. I replaced (burnt out) resistor feeding
>this diode, it was burnt beyond recognition so I replaced it with a 10 ohm -
>1/2W, any idea what the original resistor value was. After replacing
>resistor I check for AC ripple, saw 100mV so I assumed diode was OK. I will
>change it anyway and let you all know. One thing to note, I observed only
>13.6 volts feeding the LA7838 (it should be around 24V). I seperated the
>vertical PS from the LA7838 and the voltage came back up to 40V (unloaded).
>Something is loading this voltage down causing stress on the 10 ohm resistor
>again, I'm starting to see brown marks appear on the new resistor. Maybe the
>yoke is gone?
>
>David Lessard
>mrfixit@xxxxxxxxxxx
>
>-----Original Message-----
>From: techassist-bounce@xxxxxxxxxxxxx
>[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Jeff Dougherty
>Sent: Thursday, December 12, 2002 9:33 PM
>To: techassist@xxxxxxxxxxxxx
>Subject: [TechAssist] Re: Phillips 25P1-02 chassis - Model# PK4485
>(CH03)
>
>
>
>David,
>Check for LEAKY D502 (PN: 4835-130-37048)
>Good luck.
>support@xxxxxxxxxxxxxxxxxx
>FAX 717-564-4952
>Jeff Dougherty
>Intrepid Video & Electronics Be careful of your thoughts.
>501 Luther Rd They may become your words
>Harrisburg, PA 17111 any moment.
>717-909-8844
>VCR tips, electronics info & general interest.
>www.intrepid-video.com www.tech-repair.net
>www.thetoolcaddy.com www.9-11-2001tragedy.com
>***********************************************************************
>
>----- Original Message -----
>From: "David Lessard" <mrfixit@xxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Thursday, December 12, 2002 11:12 AM
>Subject: [TechAssist] Phillips 25P1-02 chassis - Model# PK4485 (CH03)
>
>
>
>Gentlemen,
>
>Vertical size is only 6" (in the center), replaced (5) caps in vertical
>circuit and LA7838, problem still there. Vertical adjust has minimal effect
>on size. Something in the sync seperation circuit? Schematic would come in
>real handy.
>
>Thanks.
>
>David Lessard
>Alexandria Electronics
>50 Harrison Street
>Alexandria, Ontario
>(613)525-4502
>mrfixit@xxxxxxxxxxx
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Peggs' Electronics
1519 West 2nd Street
Owensboro,KY 42301
270-926-4968
fax 270-686-7399
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