[TechAssist] Re: Philips 20PS47S301 (no chassis) flashes red,green, blue, dark,shuts off

Try a black light to find the cracks. The cracks light right up and the bad
solder joints shine too.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message ----- 
From: "Christopher Barnak" <cbarnak@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 23, 2004 7:28 AM
Subject: [TechAssist] Re: Philips 20PS47S301 (no chassis) flashes red,green,
blue, dark,shuts off


> Phil,
>
> What caused the crack ?  Dropped ?  Working for the school system, I
> see
> many items with cracked circuit boards. I bet you still have an open
> trace.
> And it's probably located at a heavy componet mounting point. You might
>
> try point to point continuity tracing. You'll never see some breaks in
> the
> copper mount pads by eye.
>
>
>
> Christopher Barnak, CET
> Norfolk Public Schools
> School Plant Facilities
> 966 Bellmore Ave.
> Norfolk, Va. 23504
>
> Phone 757 628 3385
> Fax      757 628 3392
> cbarnak@xxxxxxxxxxxxx
>
>
> >>> tjanphyl@xxxxxxxxxxxxxxx 7/22/2004 6:01:56 PM >>>
> Originally I located a crack across the  flyback and jumpered it. No
> others seen, and I was thorough.
> The unit powers up, the picture flashes on, flashes red, green, or
> blue,
> may be greyscaled OK but dark, then the set shuts oss. All within say
> 30
> seconds. Without unplugging, just push power again, the whole senereo
> over. There is a 80 pin SMD IC location #7200 I resoldered to no avail.
>
> I resoldered the ribbon cables to CRT board. i even removed it and the
>
> CRT board to see if it still shut off and it does.
> Any input here on this???
> Unknown chassis to me, tho it does have a Philips CRT and Philips is
> printed on the chassis.
> Tuner has an "ENVxxx" number.
> Phil Bader
>
> -- 
>
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
>
>
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