[TechAssist] Re: Philips 6P6051 PTV750 Blows HV Outputs
- From: "Corey Brazell" <cohbraz@xxxxxxxxxxxxxx>
- To: "techassist" <techassist@xxxxxxxxxxxxx>
- Date: Thu, 26 Feb 2004 07:58:10 -0500
Check the blue CRT. It's probably cracked at the face.
Corey Brazell
Audio Video Electronics
12169 SC Hwy 121
Newberry SC 29108
> [Original Message]
> From: Shoreline Electronics <jstielau@xxxxxxxx>
> To: Tech Assist <techassist@xxxxxxxxxxxxx>
> Date: 2/25/2004 6:17:34 PM
> Subject: [TechAssist] Philips 6P6051 PTV750 Blows HV Outputs
>
>
> 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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