[TechAssist] [Fwd: FIX,Re: 12" commercial B&W Philips BM7502/OOG industrialcomp.videomonitor]

  • From: Phil Bader <philbad@xxxxxxxxxx>
  • To: "techassist@xxxxxxxxxxxxx" <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 27 Aug 2001 10:09:40 -0400



-------- Original Message --------
Subject: FIX,Re: 12" commercial B&W Philips BM7502/OOG
industrialcomp.videomonitor
Date: Mon, 27 Aug 2001 10:09:10 -0400
From: Phil Bader <philbad@xxxxxxxxxx>
Organization: Jan Phyl TV Inc.
To: Electronic Hardware Repair <ELREPAIR-L@xxxxxxxxxxxxxxxxxxxx>
References: <3B817D86.5C4D94A2@xxxxxxxxxx>          
<023701c12a3c$83230800$020a1482@bureau> <3B825E83.44F6E935@xxxxxxxxxx>
<027001c12a4c$3f5e24a0$020a1482@bureau>

Had a line ( no vert). Replaced the two push-pull outputs TS431 (BC635=
NTE382) and TS432 (BC636 = NTE383) along with R434 (5.6 ohm/1W) between
the emitters. C527 (4.7/160V)was bulged,and C521 (47 mfd/25V) restored
full,good vert linearity.It is actually a green screen,not B&W. Thanks
to Mr. DeGrande for the schematic,that really helped!

Luc Degrande wrote:
> 
> Then it would be R434 5.6 ohm.
> TS431 and 32 are configured in a push-pull configuration and
> R434 is between the emitters, looks like these transistors will be gone
> also.
> Do you want a scan of this section from the schematic?
> 
> Luc.
> 
> ----- Original Message -----
> From: "Phil Bader" <philbad@xxxxxxxxxx>
> To: <ELREPAIR-L@xxxxxxxxxxxxxxxxxxxx>
> Sent: Tuesday, August 21, 2001 3:13 PM
> Subject: Re: 12" commercial B&W Philips BM7502/OOG industrial
> comp.videomonitor
> 
> > The board is darkened there,so I only read "R43?". But,This resistor is
> > connected at one end to emitter of TS431 and yoke terminal "56" (of
> > J501). The other end to R435 (6800 ohm).Hope this helps us!
> >
> > Luc Degrande wrote:
> > >
> > > Phil,
> > >
> > > I have a poor quality schematic.
> > >
> > > C527 is a filter cap on a FBT derived voltage.
> > > R431 (12K) is in the vertical section and in series with a 100p C432
> cap.
> > > The vertical is driven by transistors TS431 and TS432.
> > > When looking at the schematic it's strange that R431 can burn up unless
> > > C432 is shorted.
> > > Are you sure it's R431? Where does it connect to?
> > >
> > > Luc.
> > >
> > > ----- Original Message -----
> > > From: "Phil Bader" <philbad@xxxxxxxxxx>
> > > To: <ELREPAIR-L@xxxxxxxxxxxxxxxxxxxx>
> > > Sent: Monday, August 20, 2001 11:13 PM
> > > Subject: 12" commercial B&W Philips BM7502/OOG industrial comp.video
> monitor
> > >
> > > > This rack mount monitor is on some type if plastics extrusion
> machinery
> > > > for irrigation manufacturing.It says "Philips   Type BM7502 / OOG".
> Has
> > > > a 12" monochrome grey CRT and takes composite video thru RCA
> jacks.Can't
> > > > find any info on this unit.Has only a line across screen,no
> vertical.No
> > > > vert output IC used (such as an LA78xx).A resistor is burned,can not
> > > > read,need ID. R431  1/2 watt,at center of board. Cap C527 (4.7
> mfd@160V)
> > > > also bulged. Need resistor ID. TIA, Phil
> > > >
> >
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  • » [TechAssist] [Fwd: FIX,Re: 12" commercial B&W Philips BM7502/OOG industrialcomp.videomonitor]