[TechAssist] Re: Philips 6P6051 PTV750 Blows HV Outputs
- From: "Shoreline Electronics" <jstielau@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 26 Feb 2004 14:14:34 -0500
Blue CRT was cracked. Neck was full of fluid
We had done a coolant change on this set a years ago....no leaks.
What makes these crack?
=================================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
(860)399-1861
(860)664-3535 FAX
jstielau@xxxxxxxx
=================================
----- Original Message -----
From: "peggs" <peggs@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>; "Tech Assist" <techassist@xxxxxxxxxxxxx>
Sent: Thursday, February 26, 2004 11:43 AM
Subject: [TechAssist] Re: Philips 6P6051 PTV750 Blows HV Outputs
> look for coolant leakage.
> if so,check for cracked picture tube(face),probably blue
>
> Peggs
>
> At 03:18 PM 2/25/04, Shoreline Electronics wrote:
>
> >Make : Philips
> >Model : 6P6051
> >Chassis : PTV750
> >
> >HV Output transistor (Q906 2SD2539) was shorted and emitter resistor
R934
> >(.33 ohm 1/2 watt) was open on this one.
> >
> >Replaced both parts and T900 HV flyback and the parts shorted on power up
> >
> >Old flyback checked OK but changed it anyways to be sure
> >
> >Driving the circuit with the Sencore TVA92 shows good load draw but bad
> >timing (32us) Scoping collector of Q906 shows a good HV pulse but the
> >falling edge has an extra step on it...no ringing , just an extra little
> >porch.
> >
> >All timing parts check good.
> >
> >No cracked solder connections.
> >
> >Any ideas on this one?
> >
> >Can anyone confirm if this 32us timing is typical on this 700 series
chassis
> >with their Sencore gear?
> >
> >Any other common issues other have seen?
> >
> >=================================
> >Jeff Stielau
> >Shoreline Electronics Repair
> >344 East Main Street
> >Clinton,CT 06413
> >(860)399-1861
> >(860)664-3535 FAX
> >jstielau@xxxxxxxx
> >=================================
> >
> >
>
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