SMD transistor ID ? ... R04 ?

Sometimes, the inverter transistors fail as a result of other things such as bad transformers. You might find it a cheaper and more reliable repair, to just replace the inverter board complete. Most are available either as originals or replacements.

Arfa

Converter? Do you mean to say inverter? If so, can you identify the inverter's part number? Or, better yet, determine the part number of the LCD panel?

The markings on SMD parts of this size are minimal and are usually in some 'code' which has to be interpreted.

Graham

I did a similar search recently for a code CF (still have to order it, but probably a Rohm 2SD2150). There are lists of marking codes online (google 'SMD transistor marking code'), but most of them don't have these transistors, which in at least one place were referred to as Rohm type (though that may cover all Japanese manufacturers).

To do a brute force search, go to the B&D website and follow their manufacturer links. Look for your package type in the selection guides (SOT-89 is a common package for the inverter transistors, but every manufacturer has a different name for it) and start checking datasheets. One or two manufacturers actually have tables with marking codes, so you may luck out there. IIRC, only one or two manufacturers used a one-letter, two-number pattern (don't remember which), you might be able to readily narrow it down. Note that these codes aren't unique, so you still need to do some reality checking once you get a hit.

The other thing to search for is reference designs for the controller IC used on the board (not immediately helpful in my case, but I did learn that the circuit used is called a Royer oscillator, and some subsequent searches yielded typical schematics and transistors used). Presumably you've already googled the inverter model number.

Good Luck! TM

"B&D website", does this mean Black and Decker website? could not find any reference to Manufacturer links on Black and Deker website.

Regards,

Ravi.

Hi guys;

Yes, I did mean inverter board and I'm going to do the shotgun search on B&D this afternoon to see if I can get any info from the SOT-89 listing

I may end up ordering a new inverter, but I've got 3 of the 4 sections of the thing working now. It's just the stubborn 4th section thanks for the help, I will keep you posted on my progress.

spark

B&D Enterprises:

Unfortunately, they've changed around their website and no longer have a direct link to a linecard. There's a link to specs, but you need to sign up first to access that page. Hopefully it's arranged so that you can browse rather than just having a search engine (which is all that's available on the transistors page).

TM

I checked. It's only a search engine. Getting any part information is not easy on this website.

Regards,

Ravi

The old B&D homepage is available at the Internet Archive

TM