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dell_check_mend_likom_l705xxx_model_without_having_ability_symptom [2013/08/12 06:10] (current)
vanessa938 created
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 +Normally smps transformer is very strong as a result I didnt suspect it to tug down the flyback tester examining. I right away verify the many secondary diodes with my analog meter and found one particular diode shorted (section selection U202G). Since I do not have this element quantity, I take advantage of a UF5404 ultra rapid recovery diode for a alternative. In truth I use this UF5404 to all fourteen to seventeen Monitor like a substitution for all part range of secondary diodes. The spec of the diode was 400volt, three Amp with fifty nanosecond.
  
 +The DELL 17 Observe worked beautifully and following extensive several hours of burnin exam, I declared it alright and ready to ship back again to my loyal customer. Isnt it fun for being ready to fix a Keep track of and in the conclusion you will get paid for one thing you like performing. I just really like digital repair!
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 +The fourth step will be to observe the display in the meter. The display will go through on the list of two outcomes. If it is started off at zero, then it ought to be started off moving toward the infinity, straight away settling there as a result of infinite charging in the battery of multimeter, the capacitor is unquestionably in excellent functioning problem. Nonetheless,​ in the event you see that the meter stays within the zero, you may are aware that the capacitor is not really charging. So, it means that it's negative.
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 +Ordinarily for this BenQ FP71G+ Liquid crystal display Check together with the product of Q7T4 the main criticism was display seems for some time after which shutdown (cut off) but for this unit the grievance was dim display! Which means you do not have the possibility to discover the bright BenQ brand the instant electricity is "​On"​. When you examine the screen carefully you may in fact begin to see the photograph except that the show is rather dim. In case you could begin to see the display screen, this means the Most important board, electric power board and the Liquid crystal display Panel are functioning!
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 +A further detail that occurs in my mind was can it be the transistor by itself has difficulty that goes shorted and burnt the board or other factors failure that prompted the transistor to go shorted? I began to check the encircling components which have relation while using the burnt transistor and found the tuning capacitor ESR worth have greater, one of many drive pull transistor (C5707) shorted plus the Pico fuse open circuit! On close inspection with the capacitor, I could see bulged at 1 aspect with the capacitor. The worth of the terrible plastic movie polyester form capacitor is .22 uf a hundred and sixty Volts. Should you examination this capacitor by using a digital capacitance meter, it would demonstrate about .two uf which you'll believe is suitable. In case you failed to substitute this capacitor, the newly installed transistor (FQU11P06) would undoubtedly burn up again. On your facts, any non polarity capacitors which have the worth of or higher than .1uf (104), moreover examination it with digital capacitance and analogue meter, I'll also use ESR meter to examine the ESR value in the capacitors way too. From the above case, the negative cap has 47 ESR Ohm as well as good one particular has seven.2 ESR Ohm!
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