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

https://www.youtube.com/watch?v=Zlpz8mVJORk
https://datasheetspdf.com/pdf/576187/SanyoSemiconDevice/D1878/1

BU208 Can be substituted.

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

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.

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.

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.

sony model kv-g21p2 power on 2secon off what poblam

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? [email protected] Post Solution

I have Sony TV, transistor D1878 is damage, can i use the another type for replacemen?

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.