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My 800 mili amp fuse is out and the S1854A transistor is reading only one way on my meter,from collector to ground I believe.I have no sound or picture,I do have 38 volts standing by on sections of the board.Security monitor,19 inch older unit.

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6ya6ya
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Posted on Jan 02, 2017

  • 4234 Answers

SOURCE: Won't stay on even in standby

The voltages are wrong. You should see (0.0, +/-0.6, and B+/B-) on the 3 pins. The driver section has a problem. Check the driver stage for shorted transistors or open resistors.
Dan

Posted on May 19, 2008

SOURCE: kls-320ve-j inverter/backlight board

If you have to ask these questions then you should leave it alone. The high voltages produced by this board are LETHAL ;)

Posted on Aug 19, 2008

  • 1 Answer

SOURCE: samsung lsa800 flat panel monitor power supply unit

try this: http://cgi.ebay.com.au/New-14V-3-5A-Power-supply-for-Sun-LSA800-or-Samsung-210_W0QQitemZ150311856058QQihZ005QQcategoryZ3670QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

I am in canberra as well, and had a similar problem

Posted on Dec 03, 2008

  • 311 Answers

SOURCE: 1995 suzuki 800 intruder looses amps back fires and dies

i would be looking at the voltage regulator,if the regulator is faulty the alternator will not be replacing the voltage that the bike needs to keep running

Posted on Jul 04, 2009

  • 1071 Answers

SOURCE: wiring an amp meter diagram

put the meter in series remove wire gointo back of alternator put one lead on wire and one on alternator that should give you your reading

Posted on Jul 23, 2009

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1 Answer

My panasonic the fuse was blown out the cap 200v 560 mf and a resistance 1 ohm 7w i replaced them and the tv won't turn on


This is fairly straight forward---if it got the fuse, input filter (big cap!) and the fuseable 7 watt-----

Understand (I do not know how savy you are) the power supply uses two grounds----on the primary side of the transformer (in power supply) it is from earth ground and on the secondary side from hot ground--when checking voltages= these are the key! you have to be on the correct ground to get correct readings.

Follow the money---the primary raw should be on that cap---follow it to see when it stops downstream.

220 can pop a lot of things---the set should also have a regulator IC in the power supply (could also be a big transistor) and if a chip--raw from that cap goes into it---and regulated comes out another pin---see if you have the raw and then see if at horizontal output collector and from there to flyback( with set off what is resistance reading from the collector of the output transistor to earth ground?

what kind of experience do you have with troubleshooting?

Mar 22, 2012 | Panasonic CT-32SL14 32" TV

2 Answers

Power up problem with alesis rs300 (ra300)


you have more than likely damaged some transistors.
the resistors have burned because of excessive current.
there are 2 typesof transistors,bipolar and mosfet
a bipolar transistor has 3 pins.1) base 2)emitter 3)collector.
an NPN is tested with the + meter lead on the base , and a PNP transistor with the - lead on the base.
TESTING
base to collector should read .5 to .6 v drop in one direction and open in the other with a digital meter on the diode check function.
base to emitter about the same,but slightly higher than the collector.
if base to collector is .5v then base to emitter is .52 or so.it is always higher than the base collector number.
between emitter and collector will read open in both directions.
if there is a short on any lead combination,the transistor is blown.
npn transistors operate on the positive rail power supply,and pnp on the negative rail.
typically a 150 watt amp will run + - 65vdc.
the transistors running on the plus side are npn and on the negative pnp.
most pnp output transistors are green.,but some are black,
so we must go by the numbers on the transistors, eg.A1076 is a pnp,B755 is a pnp and all transistors that have a C or D eg. D424 are NPN transistors. all A and B numbers are PNP and all C and D numbers are NPN.
MOSFET transistors have 3 pins 1)gate 2)drain 3)source
the source goes to power like the collector does. the drain is like the emitter,and the gate switches it on like the base does.
testing a mosfet is a different procedure.
a mosfet with k then a number e.g. k135 is a positive device like npn.
a mosfet with j and a number e.g. J50 is a negative device like pnp.
a mosfet reads open source to drain both directions.
for a positive (k number device) the plus meter lead goes on the source.,the black meter lead on the drain. on the diode test function.
jump a wire from the source to the gate for 1/2 second and remove the jumper while leaving the other two meter leads connected to the source and drain.The mosfet should switch on and the meter should show a short.that means the mosfet switched on.About 5 seconds later,the resistance from drain to source should go open.
for a p channel mosfet,it checks the same,except that the black meter lead goes on the source and gate .
a mosfet will stay switched on longer than the voltage applied to the gate,if it is driving a high impedance device such as a meter.
a bipolar transistor will not stay on when voltage is removed from the base lead.
i hope this has been of some help.

Sep 09, 2009 | Alesis RA-150 Amplifier

1 Answer

Red power light on chirping beeping sound


Hello miko_alexand,

That problem indicates that the Horizontal Output Transistor (HOT)is beginning to malfunction. I would suggest that if you have a background in electronics that you do the following:

1) unplug and open the back of the set

2) look for the HOT and locate the Collector, Base and Emitter of the transistor and using your multimeter set to read resistance measure from the collector to the ground, it should read high almost infinite, red from base to ground it should read low and from emitter to ground it should read low.

3) if the HOT when read from the collector to ground reads low then you can bet that the HOT has a short circuit from collector to ground, and will have to be replaced.

4) In addition I would also perform a ring test on the Integrated High Voltage Transformer (IHVT).

This will tell you if the IHVT has suffered any damage from the HOT malfunctioning. You may end up having to replace both of the components.

If you do not have a background in electronics I would suggest that you take the TV to your local TV repair facility.

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Feb 20, 2009 | Philips 55PP9352 55" Projection Television

1 Answer

Red power light on. chirping beeping sound


Hello sedekim,

First check you connections to the circuit board some times the connections go bad from the deflection board to the signal board, if this is not the case the bottom advice may be of help.

That problem indicates that the Horizontal Output Transistor (HOT)is beginning to malfunction. I would suggest that if you have a background in electronics that you do the following:

1) unplug and open the back of the set

2) look for the HOT and locate the Collector, Base and Emitter of the transistor and using your multimeter set to read resistance measure from the collector to the ground, it should read high almost infinite, red from base to ground it should read low and from emitter to ground it should read low.

3) if the HOT when read from the collector to ground reads low then you can bet that the HOT has a short circuit from collector to ground, and will have to be replaced.

4) In addition I would also perform a ring test on the Integrated High Voltage Transformer (IHVT).

This will tell you if the IHVT has suffered any damage from the HOT malfunctioning. You may end up having to replace both of the components.

If you do not have a background in electronics I would suggest that you take the TV to your local TV repair facility.

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Feb 18, 2009 | Philips 55PP9352 55" Projection Television

2 Answers

Television not working


Hello mo4uc,

Check to see if the Horizontal Output Transistors (HOT) collector lead is shorted to ground, this can be done by taking an ohmmeter reading between the collector and ground. If the transistor is shorted, that could be one of your problems, the other problem could be a defective IHVT (Integrated High Voltage Transformer). You will need to do a ring test to see if the IHVT is good.

I hope this helps

Thank you,

Shuttle83

Aug 04, 2008 | Orion1934 19" TV

1 Answer

NAD C350


Take a ohm meter and measure resistance from emiter to collector should have a few kilo ohm on output transistor.
If no ohm meter available , remove output transistors from circuit.
note position of transistor . you have a NPN and a PNP for each channel.
Replace fuse and power up. If fuse blows check bridge in the power supply.

80% of the time output transistor burn and blow the fuse.
before replacing output transistors check driver transistors they probably burnt also

Apr 29, 2008 | NAD C350 2-Channel Amplifier

3 Answers

Power supply M500 carver


check the output transistors

Jan 07, 2008 | Audio Players & Recorders

1 Answer

Channel short


Hi there, sounds like you may have a short to ground on the output transistors. Does it have transistors or an IC output. It is most likely that you have not replaced a mica washer or insulator. Check to ground with a meter from the case of the output devices.

Aug 24, 2007 | NAD S300 Amplifier

2 Answers

Question about the voltages.


what is the question please?

Oct 20, 2006 | Sanyo DS27510 27" TV

2 Answers

Smoking Amp/Fuse Blowing


Sounds like you may have a shorted switching Transistor in the switch mode power supply causing a short to ground. If you are technical enough. Remove power remove cover and do a continuity test on the transistors on the heatsink. non of them should read zero resistance between the three legs. in all connection configuration you use to hook up your meter. If one or Two or even all of them do you must replace with proper part.

Aug 02, 2006 | Legacy LA838 Car Audio Amplifier

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