Badge Pin
Posted on Friday, May 19th, 2006 at 12:34 am
The Discovering Starts
I started to recheck the surrounding elements which have connection towards the C5707 transistors but found no faults in it. Examining the board lots of instances did not reveal any improper soldering task. There must be some thing that has gone incorrect that had triggered the LCD Monitor to shutdown. Deep in my heart I don’t suspect backlights challenge because the C5707 transistors shorted was caused by dry joints in the substantial voltage transformer. Beside, the backlights had been really reliable for this BenQ LCD Keep track of product.
Pondering again, I bought a new badge of C5707 transistors from my electronic suppliers not lengthy ago. The center pin (leg) can be a bit shorter compared to the other two as revealed from your photo under. I believed to myself would it be this badge of transistors which have predicament triggering the display shutdown immediately after couple of seconds? Needless to say I cannot blindly suspect the transistors except if I have some evidence of it. The finding starts………………
Testing the C5707 transistor with the analogue meter set to X one and to X 10 K Ohm doesn’t appear like it’s got challenge. Comparing the outcome having an authentic C5707 transistor did have some difference inside the X 10 K Ohm variety however the studying is appropriate from my many years of encounter in testing transistor. The one factor that I have not in contrast is the Hfe reading. I utilised the well-known Peak Atlas components analyzer to assess both transistors and I could plainly see the big distinction among the Hfe readings in the two transistors. The original C5707 transistor has Hfe value of 379 while the new badge on the C5707 transistor has Hfe worth of 161! At last I identified the solution!
I did tried replace the four C5707 transistors at one go using the new badge of transistors but the result was the same. Setting up the transistors that have the Hfe reading of 350 to 400 solved the show shutdown issue. This circuit look like it can only function with the identical type of npn transistor which has the quite exact Hfe value! That’s why for this kind of Keep track of circuit, a number of technicians hardly can acquire a appropriate replacement. In other words, even for those who could obtain the substitution transistor that have higher Volt, Amp and Watt but different Hfe value, you still won’t be able to provide the LCD Monitor back to everyday living again.
Little Barrie – Pin that badge
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