Question about Sylvania LC320SS8 32 in. LCD Television

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Zener diode D624 in Sylvania LCD TV is shorted.

Need voltage rating of this zener diode. I think its either 3.9 or 39 volt half watt.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

techman
  • 3130 Answers

SOURCE: tv does not power up

You answered on your own. (lol)If its suppose to be a standby 12 volt supply then whats the top voltage to be there?? 12 VOLTS!!! The value your looking for is a 12 to 13 volts 1 watt zener diode.. Im thinking your a handi man trying or attemting a repair?? please remember the HI voltage saftey issues, as these sets hold alot of HI voltage even after they are unplugged for a while. Good luck

Posted on Jun 28, 2006

  • 2 Answers

SOURCE: Need 3-digit TV remote code--Sylvania 15" LCD HDTV

many of the dish remotes have a "scan" option. This is what the installers use. You'll ned to read the manual. Its a one page explanation.

Posted on Oct 29, 2008

  • 362 Answers

SOURCE: about Sylvania TV

Hi malumbender,
Your tv dosn't have a digital tuner, in order to recieve OTA (over the air) digital signals you will need a Digital Converter Box.
Here is a link to a government website for coupons for the box. The coupons are for $40 off the purchase price of the box. There is a waiting list but they will come available as other coupons expire.
https://www.dtv2009.gov/

here is another site for antenna and channel line up.
http://www.antennaweb.org/aw/welcome.aspx

I hope this helps and please rate this solution, please keep in mind that a "Thanks For Trying" rating is negative.
Lone99star

Posted on Jan 26, 2009

taran_2005
  • 10515 Answers

SOURCE: sylvania tv model 6419TA. power supply problems

The solution woule be 5.6 v .

Thanks for using Fixya.

Posted on Mar 26, 2009

  • 230 Answers

SOURCE: Burnt Zener diode... Voltage spec??

On the cathode of the zener diode look for a filter cap and check its value the voltage of the zener should be less than the working voltage of the zener. Basicly its likely being used as a shunt regulator as protection and regulation of the voltage. When the zener hits a certain threshold it will breakdown and start conducting to ground until the supply regulates and then it will recover. If the filter cap for that voltage rail was 25V I would guess that the zener would probably be regulating between 12 and 20 volts. I'd pick a 15V Zener its probably +- %10 on the original and any system should be able to take a %10 tolerance as a general design rule.

Posted on May 07, 2009

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1 Answer

What is the zener volt


I'm not sure what your question is. A zener diode is a voltage regulator of sorts. The zener voltage is the avalanche voltage...the voltage that the zener diode will maintain when it's connected in series with an impedance, usually a resistor, IF the voltage across the zener diode and the impedance, in series, is greater than the avalanche voltage (zener voltage), and the polarity of the voltage across the zener diode is thus: positive cathode, negative anode (i.e., reverse bias). The excess voltage (the margin) appears across the impedance. Zeners are often used as voltage reference diodes in regulated power supplies. Does this answer your question?

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Hello
Did you find the value of ZD3.
I need it too.
I have the same problem, and I take out the ZD3 and the subwoofer works. But I'm not sure that is correct. I think it may be the circuit stand by.

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The zener diodes are 1N4774, I believe they are one watt. Try 3 watt metal oxide for the resistors. You might as well replace the 6800uF 63 volt main filter capacitors and the 220uF 50 volt capacitors while you're at it. Half the time the heat that cooked your other parts takes them out as well.

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1 Answer

Burnt Zener diode... Voltage spec??


On the cathode of the zener diode look for a filter cap and check its value the voltage of the zener should be less than the working voltage of the zener. Basicly its likely being used as a shunt regulator as protection and regulation of the voltage. When the zener hits a certain threshold it will breakdown and start conducting to ground until the supply regulates and then it will recover. If the filter cap for that voltage rail was 25V I would guess that the zener would probably be regulating between 12 and 20 volts. I'd pick a 15V Zener its probably +- %10 on the original and any system should be able to take a %10 tolerance as a general design rule.

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1 Answer

Sony cdx m800 no display


I think you are going to need the service manual to properly troubleshoot this. You can try to follow these instructions without one, but having one makes it so much easier. You will need to have the radio on a work bench with the CD mech out and the harness out of the car as well so you can turn on the radio and check some voltages. Since you are an electronics engineer, I should not need to point out any safety precautions, after all, I am just a technician.

For starters, check the voltages at pins 7,8,15,16,17 on connector CNP909 the 24 pin connector for the display on the main board. Pin 1 should be the one closest to the corner of the board that connector is near. Pins 7 and 8 should have 10 volts each, pin 15 should have 5 volts and 16 and 17 should both have a much higher voltage. I suspect you may be missing the 10 volts from pins 7 and 8. If so, check the voltage at the emitter of Q914 on the main board. It is a digital transistor (surface mounted) and when the power is on it should have 10 volts there and 10 volts on the collector and zero volts on the base. If any of those voltages are not there, check Q915. It should have 10 volts on the collector, 5 volts on the emitter and 5.6 volts on the base. It is not a digital transistor but is surface mounted and much bigger than Q914. If you are missing the 5.6 volts on the base, check the zener diode D905. It should have 5.6 volts on the cathode and ground on the anode. The cathode goes directly to the base of Q915. Use your multimeter on the diode check mode and see if it looks normal. Could be that zener diode is shorted. There is also 2 capacitors in parallel with that zener, C928 and C930, check those as well. If one of them shorts out it will look like the zener is shorted.

You can also check CNP805 for the 10 volts, it is supposed to be there as well. I don't know what pin number but I think that connector is on the top of the board. The 10 volts should be either pin 5 or pin 7, depending on which side you start at. CNP805 is the connector for the sub-board with the reset switch on it. After you know what these voltages are on CNP909 we should be able to narrow down the problem.

I hope this helps, I really do not have a lot of time right now. I have a power supply to fix and a big stack of car amplifiers to repair. Let me know if you need more help, I just may not be able to answer as quick as you may like, but I will answer when I have time.

Dave

Jan 27, 2009 | Sony CDX-M800 CD Player

1 Answer

Zener Diode question


NO---- You can raise the wattage not the voltage. That component in whatever circuit it was designed to operate in requires 27v one direction thus a diode. At what strengths (wattage) will depend on the load. That particular diode will pass 27 volts up to 1 watt - one direction. Like a resistor never change the ohms rating but you can increase the watts, like from a 1.5 watt to a two watt or 1/2 watt to a 1 watt.
Unlike a capacitors that are designed to deliver voltage at a correct rate (ohms) its strength comes from its voltage rating. For a more reliable cap use a higher voltage but never change the rate.
Bill

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1 Answer

Your assistance


The Sony part number for these diodes is 8-719-108-12 and yes they are 9.1 volt zener diodes @ 1 watt. I have the service manual for this set if you need it put can only send a large file like this trough a proggy called pand, so if you go to pando.com and get the proggy and leave youe e-mail addy I will send you a copy of this service manual. Good Luck

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1 Answer

Sylvania Model 6427FF; Serial V31567989


You probably have a couple of resistors out as well as a shorted D396 Zener Diode that is supposed to keep the voltage regulated at 8.2 Volts DC. With it being a Sylvania brand, it is probably not worth repairing.

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5 Answers

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I have seen the schematic, d982 is a 13v 1/2w zener
-GR

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