My cousin has a Toshiba tp48c50 rear projection tv that has a geometry problem with the red tube. The picture is good in the center but twards the edges the red is bent in like the trapazoid adjustment needs to be adjusted. He called me thinking he needed a new red tube and I told him that it is probably something else since it isn't dim and it is still in focus.
Does anybody have any ideas where to start with this?
- Mike
Repair the convergence circuit, probably the red output, and realign the convergence using a test pattern generator and alignment manual procedure.
Does anybody have the service manual for this TV?
- Mike
Okay.. maybe I should restate tha question.. Would anybody be nice enough to give me the location of this service manual? If you didn' see my parrent post it is a Toshiba tp48c50.
- Mike
You should try Toshiba parts distributors like Tritronics. The manuals are very reasonable for these sets if it still available. I think this one was only available on paper and you are unlikely to find it online. I don't know of any scans of it on any of the sites I use for manuals.
Leonard
Thanks.. I guess I'll be ordering it.
- Mike
The C-line sets are very simple, analog convergence, and the Convergence IC's are on a approx. 5x8 PCB held in with 5 screws located near the center of the chassis. The board can be removed without disturbing anything else. Look for the 2 large heatsinks and you'll find it. Be sure to note where each connector goes as you unplug it, and check the electrolytic caps while you have the board out. STK392-020 in these if I remember correctly. Replace them both while you have the board out, cheap insurance. That should fix you up. The convergence control PCB is in the front of the set, remove the speaker grille and the plastic cover under it, Conv Ctrl panel is underneath that. Pushbutton switch turns on the internal crosshatch generator, and the pots on the board should be labeled. If you have done any pjtv repair/convergence before this unit should be a cakewalk for you. I never needed a manual on any of the C or D line sets.
Jammy
Well I havn't worked on any projection tvs before but it sounds relatively easy..
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