jaborn@bbn.com (Justin A. Aborn) (08/31/90)
My 13" Sony color TV fell off a table onto its face yesterday. The picture tube broke at its rear around the electron guns. I am going to try to replace the tube myself. How hard are the convergence, purity, and beam intensity adjustments to make for the new tube? Has anyone done this at home before? I have a VHS tape of a color bar test pattern, and some text across a screen to pass for a grid and dot pattern. Am I crazy to try this? Justin
barry@hprmokg.HP.COM (Barry Fowler) (09/01/90)
You can probably do it at home if you are familiar with the alignment procedures. I have done it. I question the cost effectiveness of doing so, however. Replacement CRTs are very expensive as TVs are starting to evolve into "consumable items" and it is often cheaper to get a new set when major repairs (like yours) are necessary. On the other hand... my 1968 Zenith is still working great :-)
al@cs.strath.ac.uk (Alan Lorimer) (09/03/90)
In article <34590007@hprmokg.HP.COM> barry@hprmokg.HP.COM (Barry Fowler) writes: >You can probably do it at home if you are familiar with the alignment >procedures. I have done it. > >I question the cost effectiveness of doing so, however. Replacement >CRTs are very expensive as TVs are starting to evolve into "consumable Brand new CRTs are indeed expensive, however regunned tubes which these days are safe and cheap have a comparatively trivial cost. I have replaced a number of tubes 22" Philips G11 A56-550X etc and some 14" ones. Each tube has cost about #40 sterling to buy and has taken about 1.5 hours to fit (including line up). The problem which the original poster mentioned was a trinitron tube which I promise him will be a nightmare to fit! Fine tuning of convergence and purity on these sets is achieved by GLUEING magnets onto the outside of the bowl. It is not the action of glueing the magnets which is difficult, but the fact that positioning them requires the set to be running and access to most parts of the tube bowl. On sony sets, this is notoriously difficult - Sony how do you do it in the factory. Sony sets to do not take kindly to the idea of running while in a semi dismantled state, the boards rarely hinge out and access to the bottom part of the tube is usually immediately adjacent to the line output transformer/transistor with 27kV ready to arc accross to the unwary engineer's hand! If your local TV repair shop charges a premium for mending Sony sets - pay it willingly - at least they're going to *try* to fix it. Alan -- ____________________________________________________________________________ Alan G. Lorimer, Strathclyde University, 26 Richmond Street, Glasgow G1 1XH. UUCP: ...!uunet!mcvax!ukc!strath-cs!al DARPA: al%cs.strath.ac.uk@nsf.ac.uk Tel. +44 41 552 4400 Ext. 3592 JANET: al@uk.ac.strath.cs