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What diodes are used in the 300v secondary supply on this Cathode Ray Tube television?

Made in Poland RCA 32WR23E TV. Two are Zener, even though symbol says straight diode.

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BA 157 or BA 159 can be used. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Posted on Apr 29, 2015

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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?

Apr 16, 2013 | Computers & Internet

1 Answer

My hitachi 29in ctv power supply 110vac had a problem on zener diode will blown if we switch on the tv. what spare parts to change so that the power supply zener diode will not blown again and the supply...


The secondary output voltage comes out from is more than it should be there. That is why, the protection zener diode blows off, as soon as you switch ON the set. First find and repair the power supply regulator, for correct output voltage. Refer its repair book for details. After repair include the zener diode in place. OK.

May 08, 2012 | Hitachi Televison & Video

1 Answer

PDP 504 PG. TV Deed . smps out put Voltage 3.3V & 7.6 V . Pl z Guide Me. Pioneer Plasma Tv PDP 504 PG Thanks , Amen INDIA aminnooani@ymail.ccm


If the power supply has failed then you must check the SMPS unit. The diodes from the secondary sides must be checked including the zener diodes. please check the link below for tips on SMPS service.

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

Jul 09, 2011 | Pioneer Televison & Video

2 Answers

Color is all red


i dont know contact you service

Apr 08, 2011 | RCA F32645 32" TV

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.

May 07, 2009 | Emerson Televison & Video

1 Answer

Toshiba CZ32V51


two things can be affected, a tuner if you were using out door
the other one is the power supply. the tv sensed a high voltage (surge)
firstly you need to repair a supply, check the following.
i rectifier diodes at the power supply
ii power trasistor, driver trasistors diodes, zener diodes
ii fusable resistor near a power transistor
after the tv will come on ----if they will be light on the tube then test a tuner, by putting in signal.

Jul 08, 2008 | Toshiba CZ32V51 32" TV

3 Answers

UNKNOWN VALUE OF VOLTAGE ZENER DIODES


I was not able to find any service or schematic for this model. The colors means that the value is 22.6 volts zener diode with the other blue band indicating where the cathode is.
Could you tell me where or what other components this zener diode is connected to?

Jul 02, 2008 | Televison & Video

1 Answer

Tv shut down


Good day.


Have you cheched on your vertical IC? The zener diode along B+ and try to check zener diodes along the secondary supply form your flyback.


chris

Feb 26, 2008 | Sharp 19L-M100 TV

5 Answers

Tv does not power up


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

Jun 28, 2006 | Mitsubishi CS-35503 TV

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