The monitor went out, where to dig?

S

Sicness2012-09-05 11:01:30

Do it yourself

Sicness, 2012-09-05 11:01:30

Hello.
Nothing foreshadowed trouble, as the monitor dimmed a little for a second and completely went out. The status indicator says that the signal is on, nothing is visible on the screen at all. A test with another iron proved that the problems are with the monitor. Opened up, all the air conditioners look great. The monitor is old and then either try to do something or throw it away.
Please advise where to dig.

UDP:
When the monitor is additionally illuminated with a flashlight, the image is not visible.

Reply

Answer the question

In order to leave comments, you need to log in

5 answer(s)

K

kaladhara, 2012-09-05
@kaladhara

The first test is to turn it on, plug it in, and shine a flashlight to try to find the picture.
If the picture is visible, then there is a problem with the backlight, most likely the inverter (but lamps are not excluded, although it is unlikely, judging by the symptoms of failure).
If not, the number of options expands: from the power supply to problems with the board's stuffing. You can solve the issue yourself, but if there is no experience, spend a lot of time.

Z

zoo, 2012-09-05
@zoo

It was like that, I sinned on conders, but the problem was in the board with the power supply, I found the same one for 500 rubles, again, also used, so, given the cheapness of new monitors (3-4 thousand), I advise you to buy a new one, if the problem is not in the conders, which cost a penny.

S

Sergey Lerg, 2012-09-05
@Lerg

There are still fuses there - it may have burned out for some reason.

Z

ZUZ, 2012-09-05
@ZUZ

And now the correct answer!
This is a couple of transistors in the backlight power supply circuit that have died.
Moreover, if even the circuit of one lamp dies, the power of both lamps is turned off, such protection is not clear from what.
I speak with 100% certainty, because I myself repaired three such monitors (!) - everyone has the same problem.
Moreover, they die not from overheating, but from the fact that in the soldering of the legs of the high-frequency capacitors standing in the same power circuit, cracks appear due to vibration and they stop contacting normally (they even begin to hang out).
The solution is a thorough soldering of these conders + soldering of one / two / three (as “lucky”) transistors worth 20..30 rubles.

X

xandr0s, 2012-09-07
@xandr0s

Dig towards the store