[TechAssist] Re: **Fixed**Sharp combo 25VTJ100..not regulating.
- From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 20 Oct 2002 19:25:21 -0400
Not my tip! You have given credit to the wrong person. As far as what goes
wrong with those 7805s and 7806s that bothers the switchmode supplies, I
believe that the IC draws too much current, even though it may or may not
have the proper output voltage.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "Tech Repair CD support" <support@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, October 19, 2002 10:36 PM
Subject: [TechAssist] Re: **Fixed**Sharp combo 25VTJ100..not regulating.
>
> Thanks to Jerry Silverman..I replaced the 5v reg IC756.
> Odd thing is, I had good 5vdc out. I have no idea how it was bad.
> Before I replaced it, had ~5.01vdc, after I replaced it, output read
4.90vdc.
> Thanks Jerry
> Jeff
> FAX 717-564-4952
> Intrepid Video & Electronics
> 501 Luther Rd
> Harrisburg PA 17111-2055
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>
> ----- Original Message -----
> From: "Tech Repair CD support" <support@xxxxxxxxxxxxxxx>
> Unit came in with what sounded like a heart beat through speakers..no
power up.
> Not regulating, I have no print.
> I have voltage that jumps from 17.5vdc to 18vdc and back on pin 4 of
STRF6515 and
> 163vdc on C705, sounds high.
> Supply voltage to my 9v reg is jumping around like crazy.
> Checked my caps in these areas and resistors and all check OK.
> Power button has no effect and nothing on HOT, but I do get a chirp when I
plug
> unit in.
> Has anyone seen this?
> Thank you.
>
> Jeff
>
>
>
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