Question about Mitsubishi WS-65513 65" Rear Projection HDTV
Have model #65513 and replaced the cap's that caused blinking green light and that lasted for about 6 months and now this new problem. I'm no expert with multimeter's. What I did is set meter to 200 acv and attached leads to both ends of ic9c25 with the set unplugged it read 0. plugged in it read 2.3 when I turned set on it read 1.7. If I did it right does anyone know if those readings indicate a bad IC? Recommend replacing the capacitors next to it with the same kind?. If you recommend replacing are there any tips on procedures. I replaced the Dm board caps fairly easily. Thank you!
I'm pulling up a link while typing; the device is a fixed voltage regulator with some DC input voltage applied, ground (chassis common) and an output of a stable 9 volts DC.These are generally referred to as '3-terminal' regulators.There won't be any significant AC on any pin if operating normally.
You can get the data sheet as a .pdf file here:
You probably have Adobe Reader which you will need to open the file.
The term 'low saturation' refers to the range of DC it requires to regulate as intended; early ICs of this design needed more 'headroom' to enter into the region of stable regulation.
Looking at the marked side, the #1 pin is to the left; #3 to the right. #2, the center pin is grounded to common (chassis) and if you measure resistance from #2 to any point attached to the broadest traces you can see on the solder-side of the board, it should read close to 0 Ohms (power off for this measurement!). Measuring resistance on these parts won't yield much unless the part is shorted, a pretty uncommon condition and one that is not as easy to predict as one could with a diode or transistor.
The input lead is #1 and should be well above 9 volts DC if measured to the center pin; the output lead, #3 should have ~9 volts DC referenced as before to the center pin or chassis common.
Any AC you measure on any pin is meaningless, just noise.
I think you will find the part OK since these regulators are quite reliable when used in sensibly designed circuits.
Posted on Sep 16, 2008
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Posted on Jan 02, 2017
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