[TechAssist] Re: Philips 27PS50-B121 27L800-7603 chassis poor color
- From: Randy Evans <tvsvc2000@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 6 Nov 2003 11:04:54 -0800 (PST)
If this set has a degauss circuit similar to the F800 chassis, check for a leaky
SMD Diode in that circuit.
Tip for the F800 Chassis
=======================
SYMPTOM: Poor purity. Manual degauss will clear purity. Auto degauss will
cause poor purity to return.
CLUE: Degauss relay only holds for very short time. If relay is forced to
hold closed normal degauss with good purity occurs.
CURE: Replace diode 6591 (leaky) with Service Code 4835 130 37905.
Good Luck,
Randy Evans
VCR SERVICE
Delta, Ohio 43515
Gemini Computer & TV <geminitv@xxxxxxxxxxxxxxxx> wrote:
It sure does sound like the micro. I would give it a shot. I have seen a
variety of weird symptoms from that particular micro so I keep about a half
dozen on hand. That shutdown due to a slight adjustment of the G2 is very
common on this chassis. See the following:
SYMPTOM: Shutdown (into protect) with no symptom shown.
CLUE: Adjustment of Sg2 (master screen on LOT) may resolve but symptom may
return.
POSSIBLE CURE: The LOT (flyback) 5445. Refer to Force for the Service
Code. Several returned samples have been discovered with
unstable/intermittent Sg2 controls. Monitoring the Sg2 voltage may provide
proof of this as the cause of protection.
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: "Mitchs Electronics"
To:
Sent: Tuesday, November 04, 2003 12:24 PM
Subject: [TechAssist] Re: Philips 27PS50 27L800 chassis poor color
> Bob, it is a 27PS50-B121 27L800-7603 chassis.
> Micro is a TDA9587 but the other strange thing it is doing is.
> Adjusting screen control will cause shut down. up or down.
> Also have Intermittent Video bands about 3" high that flicker and are horz
> torn or shifted from the band above and below.Voltage at TP F441 #10 on
> flyback is - .5 volts not 1.9 and changes all the time.
> Thanks TY for the print but like a normal Philips set most of the parts
are
> not hear. Some day will get another A68AJB82x11 crt in to swap out the
> chassis. I'm convinced it is not the jug.
> Mr. R. L. Mitchell
> Mitch's Electronics
> Lincoln, NE 68502
> Mitchstv@xxxxxxxxxx
> ----- Original Message -----
> From: "Gemini Computer & TV"
> To: "Techassist"
> Sent: Tuesday, November 04, 2003 5:33 AM
> Subject: [TechAssist] Re: Philips 27PS50 27L800 chassis poor color
>
>
> That sounds much more like a bad UOC (micro) IC (ref# 7200) to me. What is
> the complete model and chassis number of this unit?
>
> 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: "Garbage"
> To:
> Sent: Monday, November 03, 2003 8:41 PM
> Subject: [TechAssist] Re: Philips 27PS50 27L800 chassis poor color
>
>
> > What happens if you set your generator to white raster. Green only? Red?
> > Blue?. In green only, can you adjust your yoke forward and make it
> > disappear?? Or backwards (not likely) to fix this??
> >
> > Damon Brunger
> > Telrad Electronic Services
> > Ft Wayne, IN 46815
> >
> > ----- Original Message -----
> > From: "Mitchs Electronics"
> > To:
> > Sent: Monday, November 03, 2003 11:02 AM
> > Subject: [TechAssist] Philips 27PS50 27L800 chassis poor color
> >
> >
> > > Told the customer that the crt appears to be bad, even though it is
> still
> > under factory warranty. He said send it to the land fill. Thought I
would
> > fire it up one more time, like always to see if I was thinking right.
> > > I don't have a print on this but I don't see how the crt can be bad
> > because if the shadow mask was loose it shouldn't change color wise.
> > > When put it on video 1 does have a pretty 3 color effect with green on
> the
> > left blue in the center and red on the right, BUT if bring up the Menu
bar
> > the color is blue on the left red in the middle and green on the right
> > inside the bar. Or even the volume bar which is suppose to be red? is
red
> in
> > the center with the blue back ground but on the right with the red
> > background it changes to Green. I don't see how a shadowmask could do
> this.
> > Any one have any thoughts?
> > > Mr. R. L. Mitchell
> > > Mitch's Electronics
> > > Lincoln, NE 68502
> > > Mitchstv@xxxxxxxxxx
> > >
> >
>
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