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We need to find shindengen diode schottky F20NC15M B1268. we have already replaced the bad caps. Where can we find this componet?

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How test circuit diode schottky

Take your digital volt meter. Place meter on the diod setting. Place your probes on each leg. You should read .7 to .2 in the forward position and infinity or high megs in the reverse position. You'll need the data sheet to find out spec.

May 30, 2014 | Electronics - Others


Magnavox TB100MW9 DTV Converter repair

After a close-by lightning strike, my Magnavox TB100MW9
Digital TV Converter box stopped working. I took it apart and found a
shorted diode (the fat one on the power side of the board)
marked with the number SB340. From the NTE cross-reference
web site, I found a replacement diode, NTE586 (Si, Fast
Switching, Schottky Barrier Diode) that cost me $2.40 at
a local electronic parts store. I replaced the diode and
it works fine!

on Apr 27, 2015 | Magnavox TB100MW9

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Monitor was alternating dim/bright, after a couple hours it went black. Turn monitor off, back on it displayed as normal for about 2 seconds. Pulled it apart and found 4 of the power supply caps bulged,...

Ok, you need to check the DC voltages on those four caps with the monitor in the OFF mode, do not turn on the monitor so the power supply will be running without the load (the power supply is running the minute the monitor is plugged into the outlet), you can use 12v car bulb such as 1157 as a load, the output voltage in the inverter should be around 12vdc with load, if it checked out OK, then the next step will be the inverter circuits, you will need to the test lamp to find out if the inverter is OK or if you have the bad lamps. The diode you replace is more likely to be SCHOTTKY DIODE for high speed switching power supply, regular diode will not work.
PM me if you want the service manual:

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors:
Learn about bad caps:
Capacitors kit: he can make you a set of caps.
Or, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.
Please leave rating if it helps.

Feb 12, 2011 | ViewSonic VA1703wb Monitor

1 Answer

How to tune a galaxy 55v mobile to receive better

really the only thing you can do to the radio is make sure it is aligned, and that it is receiving on frequency. Although this unit has a frequency counter that will tell you where it's receiving, you cannot successfully put the radio on frequency unless you fully align the radio. In order to align a radio you need a volt meter, watt meter that reads avg watts, and an oscilloscope.

A volt meter and watt meter is easy to come by, however the oscilloscope is an expensive piece of equipment to attain.

You can just as easily tune your clarifier to the correct receiving frequency on the counter.

An easier way to improve your receive on any radio is to make sure the antenna is tuned for best SWR. When an antenna is tuned to the proper length for the best SWR your receive will get better because your antenna will be on Que.

There is also a Schottky diode upgrade that can be done. This consists of changing the detector diodes in the radio to schottky diodes as well as changing a transistor. This mod improves receive in most galaxy radio a great deal.

You can get these as a kit with full instructions on ebay fairly cheap.

You need to replace diodes D1, D2, D23, D24 with the schottky diodes in the kit, then replace TR-17, with the transistor that comes in the kit. Then remove TR-14. and them remove TR-19, and put the transistor from TR-14 in the TR-19 spot.

The Transitor that goes into TR-17 is a 2sc2999. I can't remeber what the Schottky part number is. But like I said, they sell the kits with complete instructions on ebay.

Here you will find all the technical information about your radio, as well as alignment guides.

Here is a link to ebay with an upgrade kit and instructions on ebay.

Oct 13, 2010 | Galaxy Radios DX-55V Base CB Radio

3 Answers

Yuraku LCD TFT Monitor MA7BBA Wont power up


I've had the diods problem on such a monitor recently. To fix it I had to change the fuse and two 1N4007 diods as you can see on the following page:

You will notice I mounted the replacement diods on the solder side ( second hand components with too short leads) and that only 3 diod locations are seen on the component side; the fourth is hidden under the transformer on the top side.

Hope this can still be of any help.

Apr 28, 2009 | Computers & Internet

1 Answer

Akai PDP4225M red std/by light on


There is a difference between diodes and capacitors. The role of a diode is to rectify and some cases regulate voltages. Meanwhile, a capacitor is there to hold charges. Back to your question, to check an schottky diode, you need an ohmeter with a diode symbol, the reading starts like this .500, .600, .300. 125. still consider good forward bias. .1200 or infinite reverse bias is consider good still. But it shows 0 continuity then that diode is bad. You can also use ohm's law, resistance to also check a diode. Please e-mail me if you some further lesson at

Dec 01, 2008 | Akai PDP4225M 42 in. Plasma Television

3 Answers

HP Pavillion dv6500 Notebook. Power light coming on when connected up to charger but no charge going in.

I just fixed my friends dv6500
it had same probs as mentioned above

the probs i found : shorted schottky diode marked LG = smd10k45
                           shorted n-ch mosfet      marked 702 = 2N7002
                           defect smd cap
All these are placed just below the battery connector on mobo
see page 128 of service manual
replaced these smd's and laptop worked again

the damage was caused by overheating of the smd's
could be you have the replace other smd's surrounding these mentioned above
depends on how hot it was

hope this helps 



Nov 13, 2008 | Computers & Internet

1 Answer


hi isolate ur power unit out replece ur resisitor & every other burnt items then check the schottky diodes in the secondary side &the electrolytic capacitors if bulgge or leak. if all this are ok , power then use voltmeter to test ur output voltages if ok , unplug your inverter  & power

Nov 10, 2008 | Akai LCT3201AD 32 in. LCD Television

3 Answers

Blown Capacitor and diode

I had the same problem. My nephew gave me this set after it quit working at the Gym where his wife was working. They were going to junk it but I asked if I could try and fix it.
The capacitor C2250 was definately blown and easy to spot so I did some searching and found a replacement from an online electronics supplier that didn't require me to buy 200+ as Digitech wanted. Anyway I replaced the Cap and it still didn't work so I started looking and testing components again and found that the Diode D2250 was bad so replaced it as well and now the set works fine. Maybe this is what is wrong with your's and others as well.
It made sense for me to check the diode as it is right next to the cap that blew. for the Cap and for the Diode.
The specs for the Cap/ CERAMIC CAP. B K 1500pF/1KV
The specs for the Diode/ SCHOTTKY BARRIER DIODE YG123S15

Hope this helps

Aug 25, 2008 | Sylvania 6842PE 42 in. HD-Ready Plasma...

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