Hello everybody. I'm her to ask you about a problem i can figure out. I
have an AOC Model 5E monitor, it turns on, High voltage is there, and
scan (raster) works, but the image it displays is so dark that it
almost can be viewed. If i push up the screen pot in flyback, the
background brightness goes up, but dhe image dont get better, even when
retrace lines appears, so is no a flyback fault. It looks more like an
video amplitude problem, but i'm not shure. The brightness and contrast
controls work fine, but is like the overall values of video amplitude
are too low.I`v read a lot about it, and now i'm onfused.I checked de
ABL, and adjusting it=B4s level it gets better, but no enough. I got an
diagram from eserviceinfo.com, bt it's no accurate (there are entire
changed stages),but it=B4s pretty close. However, the voltages i measure
are few different from the showed there, and i have no means to know if
it is a design difference or an anomaly. Now i show the values i get
from the tube terminals, all taken with an ancient digital FLUKE
multimeter, in DC Voltage mode:

G =3D 67 V
B =3D 68 V
R =3D 68 V
G1 =3D -27 V
G2 =3D 264 V
Heater=3D6,07 V

In the video stage it uses LM1279 as driver and LM2438 as power output.
The supply voltages for this one look normal (15 and 75 V)
I don=B4t know what else can i explain.

Besides, i got an similar problem with an Hurricane Systems Model
MT-14SV28NI, but it show intermitent. This one uses the LM1203N and
LM2406T pair.

This has become an mistery for me, any help or advice will be welcome.
I'm thinking about change the video output ICs, but first i better look
here for some answer.

Well, giving thanks from now, i say goodbye.

JCVH - ERDM