Mikey's right! I fixed a guy's furnace control board .. flaky burner valve opeation. Just by understanding how to 'flex test'. - little as possible movement thn probing the board with small screwdriver to localize, then resolder.
I spray the pcb with flux, hit the points that need solder with a syringe full of kester 44 paste, and hit them with a heat gun until the solder melts across the board.
Takes 5 minutes, max; and you don't even have to localize it.
I can unsolder and resolder those, but as the man said, solder is usually the problem.
5 minutes of my time to not to have to find and get a $30 part is more my speed.
Oh, the transistors are drivers; you can tell by the center Collector lead. Any >25V transistor with that pinout, rated for ~1A, will work. If you replace transistors, replace the diodes too.
The transistors are labelled ECB on the circuit board, it looks like. The flat side is not always the same, so check the data sheet.
I use digikey for stuff like this; they also sell tons of leds, if you need to make up the minimum order...
Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
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Last edited by Grog6; 07-26-2011 at 04:30 PM.