Changing Microwave Higher Voltage Capacitor7753760
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This DELL seventeen Keep track of (Designed in Malaysia beneath LIKOM design L705XXX, solution no: L7055LP) arrived in without any power symptom. Normally right after opening up the duvet I'd personally have a look at the facility offer (principal facet) for just about any burnt and cracked components to start with. If you will discover darkened place and burnt components, I would convey to myself this Watch requires a little bit more time and energy to repair it. If it is not (factors intact) I might ordinarily commence to discharge the filter capacitor and start examining the fuse.
Ordinarily a mend technician or engineer includes a procedure or their unique style of fixing tools. I am able to say the majority of us as digital repairer perform a exam 1st to view exactly what the fault is right before started to open up up the tools and mend. As an example, a Watch with a single vibrant white horizontal line throughout the display reveals to us that the fault is in the vertical portion or circuit. The moment the cover opens, we'll head straight towards the vertical area and seem for dry joints, execute voltage screening, look at for related parts, examination vertical yoke coil and even direct switch the vertical IC.
If your fuse is ok, knowledge will inform you the bridge diodes also are functioning high-quality. Position your black probe within your analog meter set to x1 into the centre pin (drain) of your energy FET and pink probe towards the other pin 1 at any given time (gate and resource). If your pointer on the meter doesnt kick then eighty % of your Ability FET is alright. In order for you to 100% affirm whether it is great then you definitely should solder it out and examination. In the event the pointer reveals a looking at then most likely the facility FET has developed a short circuit. The end result which i received from this Observe was the pointer dont flick.
Now I moved on to examine Sizzling along with the very same process as checking the power FET. The hot checked to be okay too. Future, I examine the inner capacitance on the flyback transformer to find out it truly is shorted or not or is the capacitance value operate. For the information, inner capacitor in flyback transformer gave a lot of issues in computer Observe. I also scanned through the B+ FET and located it to get great much too.
Generally smps transformer is very robust hence I didnt suspect it to drag down the flyback tester reading. I right away verify all the secondary diodes with my analog meter and found just one diode shorted (component quantity U202G). Since I do not have this portion number, I exploit a UF5404 extremely quickly restoration diode being a substitution. The truth is I exploit this UF5404 to all 14 to 17 Keep track of being a alternative for all element variety of secondary diodes. The spec of the diode was 400volt, 3 Amp with fifty nanosecond.
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