Hi at all,=20
I bought an old computer with the wishing to make it alive. It=92s name =
Kaypro-II and it has a 9" green phosphor monochrome monitor composed of =
LR30477 E39164 TOSHIBA CRT and a printed circuit steering Toshiba
TLC-134-TV-0. I tried to supply it with 12Vdc and I noticed that the =
of the CRT is lit, while the screen does not turns on and no shows light
even using the knob back adjustment for the light intensity. Wishing to =
TV repair technician I need the wiring diagram of the circuit electric =
Toshiba TLC-134-T-V-0. Is there someone who has it?
Even without the scematic you van prbobably do some tests. If the input
conencotr is the normal 10 pin edge connector, you cna check to see if
there are sync and vbideo signals on the right pins with a 'scope. If
there are, then the fault is in the monitor, if not, then the digital
part of the machine needs repairing.
Also check the CRT voltages. Monochrome CRTs are pretty generic, and it's
likely this one has a 7 pin base with a 12V heater. I think I posted the
pinout and expected voltages a couple of weeks ago.
I seem to hear at the power on from the CRT an high-frequency hiss and i
tryed to see if come out a shoke from the flayback transformer but =
Other useful info:
1) on the PCB
SN 23989586 K10MRDO
Toshiba 23879862 TLC-134-T-V-O
There is a chip NEC =B5PC1031H2
IIRC that's a single-in-line package (SIL) with a heatsink tab on top. 10
pins or so. It's a verticla defleciton and output stage IC. Getting a
data sheet is non-trivial (the major on-line data sheet sites don't seem
to have it), but there's a close equivalent that you can get data on. I
cna look it up if oyu need it.
But if th verticla side has failed, then you'd expect to get a horizontal
line o nthe screen. The fact that the screen it totally blank suggests
the fault is elsewhere.