Question about Sony FD Trinitron WEGA KV-20FS120 20" TV

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Samsung d1878 no power on - Sony FD Trinitron WEGA KV-20FS120 20" TV

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Check its main power regulator section circuit and replace damaged component/s. If you have sound knowledge in electronics, you can do it by yourself. If so, send your email address to me by Fixya, and get a copy of the schematic diagram of this set by return mail. It will help you to locate the fault very easily.

Posted on Nov 27, 2012

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Posted on Jan 02, 2017

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I want the exact horizontal output transistor of that model. Because some technicians have taken out that transistor.


If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/ Circuit diagrams of many popular brand TVs and other devices are given.

Nov 11, 2017 | LG Televison & Video

1 Answer

D1878 transistor is getting heat and its not working for 1 hour if we replace new one


check your audio section & replace transistor or" ic. check heat of parts for detect to damage parts.

May 29, 2012 | Televison & Video

1 Answer

I have sony J21mn11. problem not power on only red lit led only.i check all the components on the power supply area and horiz. output D1878 all are good. there is power IC STR S6707 on power supply area. i...


If you have a digital tester or analog try to check the voltage reading from the power supply if high or low or no supply.Check first following voltage location and section. * Check the AC voltage from ac cord to fuse and before the bridge type diode. * Check the DC voltage after the bridge type diode.if normal voltage. * Then check the voltage into the filter capacitor to regulator ic.the power ic.If theres a input voltage in the power ic,check the output voltage going to harizontal output.If no output the problem is you power output.You need to replace it.

Jul 12, 2011 | Sony Televison & Video

1 Answer

Respected sir i want to know the equivalent of d1878 transistor


That is a Sanyo type of line output transistor, sometimes used in power supplies of PT03 style.
Equivalents include the very popular BU508DFY BU808DFI etc or 2SC5885, 2SC5387 etc

I would choose a BU808DFI as a substitute. Slightly higher current and power rating.

Dec 13, 2010 | Televison & Video

1 Answer

The straped Capacitor from D1878 collector to graund,immedaitly blow out or burn out.


The first to do is to check and see if D1878, is shorted, or any other semiconductors shorted in that circuity, taht are related to the Driver (D1878), and or the Cap. Replace the bad components and cap.

Nov 14, 2010 | RCA 27F530T 27" TV

2 Answers

Transistor d1878 get over heat


i have a sony kv-2197m3 i replaced tr D1878 tv turn on,but image it's bad in horizontal seize and tr D1878 was shorted again what's the matter? chek68@gmx.fr Post Solution

Oct 11, 2009 | RCA 27F530T 27" TV

4 Answers

No Power on Sony TV


Be sure to use an ORIGINAL Sony transistor and be sure to resolder the pins of the small horizontal driver transformer and all parts connected to and around it, and your set should be fine.

Aug 17, 2007 | Sony FD Trinitron WEGA KV-20FS120 20" TV

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