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Soyo 17'' Monitor (DYLM017A)(VT17N71), identity of fuse.

Soyo 17'' Monitor (DYLM017A)(VT17N71)

Computer was shut down last night, it usually runs 24/7. When turning it back on today the computer booted up just fine but the monitor stayed black. No power lights, no anything. Checked the power adapter with multimeter and it gave the correct voltage (12v, 4a). Plugged it back in hoping it was just a bad connection...nothing. Then tried talking nice to it, waste of time. So I took it apart and started testing for continuity, lost it at the first fuse (F500 label on PCB). Plugged all the wires back in and gave it power. On one side of the fuse I had 12v and on the other side..nothing.

So my guess is that the fuse is blown. I could be wrong, please correct me if you think I am. This is where my real problem starts...I can not identify this fuse. Below are some high res pictures of it and another one just like it on a different board in the same monitor. It looks like a resistor, pale green/blue coat with a single orange band...but to my knowledge resistors have 4-5 bands to identify them. I also have not found a Pico fuse that even comes close to its coloring. There are markings on its case, one side it says ''PSE'' in a horizontal diamond with the letters ''JET'' outside of the diamond. On the other side it has ''SG3A''. I have searched for all markings and the PCB number...nothing.

I did find someone else that described the fuse colors as I have, it was for a ''Mitsubishi TV #WS55511''. I do not know for sure if it is the same fuse or not, just found the description very close to what I am looking for.

The blown fuse prior to removal, shows the PSE JET marking.

Blown fuse removed, showing SG3A.

Duplicate fuse on other board in same monitor (Yes I noticed the crack in coating).

Any help would be greatly appreciated, so far it has stumped me and everyone else that has seen it. The
single band doesn't seem to relate to any color code charts I have been able to find.

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  • roderick Guariño
    roderick Guariño May 11, 2010

    what u need is to check the voltage of power supply circuit.I think the problem is the power ic and the power transistor replace that with new one.Check also the flyback and check also the mylar capacitor value 220 or 180volt 2kv these capacitor is the supplier of the voltage to the crt.check these component.



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Orange color of the ring means number 3. Part of marking also contains "3A" so I'm pretty much sure it is 3 Amps rated fuse. But before replacing it measure the resistance on the PCB where that fuse was blown, between common mask (usually metalized mounting holes are connected to it) and the second pad of that fuse. How much is there? If you measure less than 12/3=4 Ohm the new fuse will blow again and you need to find what is shorting the power supply.

Posted on Sep 12, 2009

Testimonial: "Thanks man, I was thinking it was a 3amp but wanted to ask someone who actually knows about PCB components before going any further. 2 thumbs up!!"


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I've spent a bit of time researching this problem for you and have come up with the following, hope it helps.

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Auto-tune isse


you could try adjusting the screen resolution in My Computer/Control Panel/Display this may help.

Also have a look to see if the Adaptor, is set for optimal refresh rate.

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your monitor doesnt have drivers for it.. and doesnt need drivers for that matter. It sounds like you dont have the right drivers installed for your graphics card. here is a link to the drivers you need.

hop this helps, good luck.

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