Watt Soldering

In Other Words, Even In Case You Could Obtain The Substitution Transistor Which Have Higher Volt, Amp And Watt But Various Hfe Worth, You Nonetheless Won’t Be Able To Carry The LCD Keep Track Of Back To Everyday Living Again

I started to recheck the encompassing elements which have link to the C5707 transistors but located no faults in it. Examining the board numerous instances did not reveal any incorrect soldering job. There must be something which has gone incorrect that had triggered the LCD Monitor to shutdown. Deep in my heart I don’t suspect backlights issue for the reason that the C5707 transistors shorted was brought on by dry joints inside the large voltage transformer. Beside, the backlights had been really dependable for this BenQ LCD Keep track of design.

Thinking back again, I bought a brand new badge of C5707 transistors from my electronic suppliers not long ago. The middle pin (leg) is a bit shorter as opposed to other two as shown from the picture beneath. I thought to myself would it be this badge of transistors which have predicament leading to the show shutdown right after few seconds? Needless to say I can’t blindly suspect the transistors unless I’ve some proof of it. The obtaining starts………………
Testing the C5707 transistor with the analogue meter set to X 1 and also to X 10 K Ohm does not appear like it’s got situation. Evaluating the result with an authentic C5707 transistor did have some distinction in the X ten K Ohm range however the reading is appropriate from my many years of experience in testing transistor. The one factor that I haven’t when compared will be the Hfe studying. I employed the famous Peak Atlas components analyzer to assess both transistors and I could clearly see the huge difference in between the Hfe readings of the two transistors. The authentic C5707 transistor has Hfe worth of 379 even though the brand new badge of your C5707 transistor has Hfe value of 161! At last I discovered the answer!

I did tried substitute the 4 C5707 transistors at one go with the new badge of transistors but the result was exactly the same. Putting in the transistors which have the Hfe studying of 350 to 400 solved the display shutdown dilemma. This circuit appear like it could only function with the identical sort of npn transistor that has the quite exact Hfe value! That is why for this kind of Monitor circuit, quite a few technicians hardly can discover a appropriate alternative. To put it differently, even if you ever could get the substitution transistor which have higher Volt, Amp and Watt but various Hfe value, you still won’t be able to bring the LCD Monitor back to lifestyle again.

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