-------- 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 > > > > > > Help make your TechAssist online repair tips database better! Submit your fixes here: http://www.circuitwork.com/techassist/tip/#tips To unsubscribe write to: techassist-request@xxxxxxxxxxxxx with unsubscribe in the subject line.