[TechAssist] Re: Emerson MS 250RA power supply pulsing

Bill,
Check solder joints R311 and R312
Also, from Tech Repair CD:
REPLACE SHORTED IC501* Q502 & R518 OPEN
Jeff
FAX 717-564-4952
Intrepid Video & Electronics
501 Luther Rd
Harrisburg PA 17111-2055

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----- Original Message ----- 
From: "Bill Boyd" <billstvs@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, April 30, 2002 11:53 AM
Subject: [TechAssist] Emerson MS 250RA power supply pulsing


> 
> make: Emerson
> model: MS 250RA
> chassis: N25-02
> 
> The power supply is rapidly pulsing and putting out about 35V.
> I can jumper the regulator and adjust variac for 125-130V and
> have picture and sound. I have checked all resistors and transistors
> on the regulator board. I checked or replaced the filter caps and
> no change. There is a feedback pulse from the flyback and it looks good
> but I don't know what the amplitude should be. It won't work with the
> HOT disconnected and a light bulb used for load either.
> I don't have a schematic. If anyone can send me a scan of the power
> supply and horz output circuit I would appreciate it.
> Any suggestions welcome.
> 
> TIA
> Bill
> Bill's TV Service
> Sulphur Springs, TX
> 
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