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Strange shrunken capacitor(?)

I have an old Gateway EV700 monitor which shuts down after a few minutes of use. It sometimes sort of flashes the screen as if maybe it's trying to start back up, but is never able to on its own. It will come back on for a few seconds if power cycled, but will then shut down again.

After it's been off for awhile it will come back on and last a few more minutes, but then exhibits the above problems again. When it shuts down, it has a sort of rainbow swirl pattern in the center of the screen.

I opened it up to see if there was anything obviously wrong, and saw what looks like a capacitor which has been twisted and shrunken, but I'll admit that my knowledge is limited enough that it could be something else entirely.

Here are some pictures. The white goo on the side is just glue, it didn't come from inside the object. I didn't see any obvious signs of leakage or damage, but this thing certainly looks unnatural.

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Any idea what this is, if it's bad, and if replacing it might solve the shutdown problem?

Thanks for any info anyone can provide.

Reply to
Yattaro
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Looks like a coil or choke.

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Reply to
Meat Plow

Looks like an inductor that was shrink-wrapped and damped against vibration with a bit of either RTV silicon or elephant-snot.

Peter Wieck Wyncote, PA

Reply to
pfjw

Repeat after me: "Inductor, not capacitor" and you will be OK!

Reply to
PeterD

  1. The "white goo" appears to be hot glue use to hold the component (possibly during wave soldering step)
  2. This circuit board has silk-screened legends, such as C102, L302, etc. The first character used to identify this component will tell you what it is: "C" - capacitor, "L" - inductor
  3. The component appears to have a polarity stripe, like electrolytic capacitors.
  4. IF this is an electrolytic capacitor -- I would replace it based upon it physical condition -- but you would need the correct value and voltage rating! From your photos, really can not tell -- no value markings other than the marking of: LO5G
Reply to
w9gb

Its definitely an inductor - quite likely a linearity coil (polarising stripe is an obvious clue) close examination may reveal that the ferrite bobbin has an extra bit glued on the end opposite the leadout wires, this will be magnetic which is easily confirmed by offering it the tip of a screwdriver.

Mark the base of the bobbin as per the polarising stripe and peel off the shrink wrap to inspect the winding for heat damage.

If the part is knackered it will be practically impossible to order a replacement - go down the dump and claim a monitor of similar size & spec to salvage the part from, but try it first - you may get lucky.

Reply to
ian field

-

(L05G).

This should be a start, if nothing else.

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Peter Wieck Wyncote, PA

Reply to
pfjw

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For the value of a CRT display these days its hardly worth the effort of what I suggested, let alone what's involved ordering a one-off part from China!

Reply to
ian field

The line appears to be an indicator of the position of the leads.

When was the last time you saw an electrolytic made with a molded ferrite core?

Which indicates that its an inductor, not a capacitor.

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Michael A. Terrell
Central Florida
Reply to
Michael A. Terrell

Could you elaborate on this type of inductors? Polarized? what does the magnet do?

Thank you.

Best Regards

Reply to
Steve Sousa

Makes it easier to saturate the core with current in one direction than the other.

Reply to
ian field

It prevents the core from saturating, due to the DC current flowing through the winding(s).

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
Reply to
Michael A. Terrell

you'll need to look at the pcb underside and check for cracked solder joints. especially in the power supply and line stages where larger or hotter components are. this sort of intermittent problem is often caused by poor solder.

Reply to
b

I've never seen one of these. Open it up!!!

Reply to
Esther & Fester Bestertester

They're very common in monitors and power supplies. Don't mess with it, it's not your problem.

Reply to
James Sweet

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