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felto
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Posts posted by felto
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Ok I get squelching noise when I turn the monitor on
but no LED light. I also do not get anything on the screen.
Let me know if you can help
thanks -
That part no. is from the working monitor
as for the non-working one the part no.
is C5302
I checked the diode test from C-E junction
and it get a reading of about .4 volts
Is there another test from another junction
that I can hookup my meter to? -
The Horizontal Output Transistor from my old monitor
is part no. DE9704 -
I have another monitor that has one can I just
swap to into this one. The part no. is different and
I dont know if these things are interchangeable.
Will that work? -
New York City
The part no. for the HOT is C5302
hope that helps -
Whats a good site in trying to find a replacement for
the Horizontial Output Transistor?
thanks -
I forgot to ask you on my last post.
What value should I get when checking
resistance on collector-emitter junction
of the HOT? Do I set the volt and the
highest resistance scale? Let me know -
Step down converter you say.
Is that the same as the flyback transformer?
Is there an easy way to check this part
without disconnecting it from the board.
As for the HOT what readings should I get
out of it. by doing the diode test I think getting
the .6 volts is sufficient no?
What else can I check on the mainboard that would
likely be the culprit? Thanks always for your help -
Go into your systems settings of your control panel
then click where it says usb ports and you will see the
current supplied for each. I thing it was between 450 and 500MA -
It is a Sony monitor and I dont remeber the model no.
I do hear it making a sound when it is turns on.
The LED power light does not come on when I
power it up. The screen remains blank when I
power it on. As for the output transistor I do get
a .6 volts across collector and emitter when tested.
But I get an open between the Base and the Emitter.
What is EHT?
Let me know if you need more info
Thanks again -
My computer monitor just went on the frizzs.
So I decided to open it up and investigate.
I do not see the obvious burnt component
and also checked out the fuse if it was burnt.
I put a voltmeter on the output transistor
and I get around .6 volts which tells me that it
is probably good. Can anyone give me some advise
on what can be wrong with my monitor. I get no power
coming out of the unit when I fire it up. I would really like to
fix this because it is a sony monitor and payed alot for it.
Any advise will be greatly appreciated. Thanks -
Can you tell me what site I can find this step up transformer?
Do I just wire it into the other transformer? -
ok upon further inspecting the unit it says that it uses
250V and 1 amp. So where do I go from there?
It looks as if the transformer is part of the whole unit
and it cant be replaced. Can I add something within the
circuit to let it run at 110V. Maybe a power transistor or something............. -
instead of doind all that why dont you just run
jumper wires to whatever part of the circuit it was
hooked up to. In other words where it was broken
off just take the wires and solder them into the traces
where they were connected or find a junction point and
solder it there. -
Can you tell me what readings are you looking for
on the tranformer? I have the unit disassembled
and the tranformer is exposed. Where do I hook
up my voltmeter and do you need volts, amps or what?
Thanks -
Pretty neat labs you guys got there
Have you guys actually repaired anything in
these labs? All i see are broken parts hanging around -
Thanks for the reply
It says that its at 1ma current
and I think 140 watts of power. -
Hi
I just would like to inquire about a coffegrinder
that was given to me from europe. The plug on
it was not the standard 110V supply so I changed
the plug on it to suit my outlet. Now it still grinds but
the problem is that it runs slower. I think I need to
change the transformer or something on it. How
exactly do I do this and what type of transformer
do I need to install to suit my 110V outlet.
Thanks -
I checked the power supply already with a voltmeter and
it checks out ok. I get 30 Volt output which is what it calls
for. Something on the board itself burnt out. I think it may be
the voltage regulator on the board. Lets hope that is it. It a
7812CT version made by Motorola. I just bought a new one from
Radio Shack and am going to solder the new one in tonight. I think it is bad because it gives me an open circuit alert on my voltmeter, which is capable of checking diodes also. Anyway do you know exactly how to check the regulator with a voltmeter. It has three pins to it. One for the input, middle for ground and the third pin is the output. Thanks for your help -
but can I test the leads just like I would
test a diode? -
Thanks
Do you know how to test a voltage regulator?
I have a 7812CT 3-pin voltage regulator
and I think its bad. Can you tell me
what pins are what and how to test
it with a voltmeter? Its for a multiprinter
gizmo and when I hook up the power it sparks
back and I get no juice from it. Thanks again
for your help -
Has anyone ever heard of this switch?
It looks like a 'U' shape and has four terminals
to it soldered to the circuitboard. In between
the 'U' shape is a grove where something blocks
the optics and I guess that it turns it on or off.
My question is does anyone know how to measure
this with a voltmeter? I know there are diodes
inside to measure for .6 volts or something but
can someone tell me which terminals to test
and what readings should I get. Thanks in advance -
That has something to do with your phone line that needs distintive device so that your fax can understand your phone line when it is sending a fax. Look into your phone modem options in control panel and there should be something in there about distintive ring. I think you should check that option so that your fax and phone line can communicate with each other.
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Hi all,
Can anyone help me in fixing my lexmark printer?
I have a multiprinter type (scanner, fax, print) and
the problem is in the main circuit board of the printer.
When I connect the power cord I can see a spark from the
connection but I get no power to the unit. The board does not
have any fuses where I can check. The only thing I can find is
a diode thats right next to the power connection of the board. It
gives me an open diode with my voltmeter. I preceeded to change
that diode with a new one, but the same thing happens to the diode. Something weird that I dont understand, when I unsolder the diode from the board it give me a .6V reading which is good, but when I solder it to the board it reads an overload, which is a bad diode. Anyone can explain this mystery to me and any help in diagnosing my printer. The board does not have any transformers to. It is part of the plug itself. For your information I have checked all of the other diodes that are soldered to the board and they all come out ok. Its only the one nest to the connector. thanks for your help.
CRT monitor
in Electronics chit chat
Posted
You know that noise that comes on
when turning on the monitor