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LCD TVs - LED

LCD Top House KL32QS62U dead source

agefito
agefito
agefito
11
hace 5 años
hace 5 años
Hello! how's it going? I have an LCD Top House, with the dead source, it doesn't deliver any voltage to the output. Could it be that the problem is in FAN6755? The outputs of Sense and FB give me 0v, in addition, there is an optocoupler that is short, but it is not the opto itself, but the plate. Thanks in advance I leave the schematic of the source
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agefito
agefito
agefito
11
hace 5 años

The optocoupler is the NB951, it marks continuity of both leg 1 to 2, and 2 to 1.

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Franki Lobaina
hace 5 años
hace 5 años
Friend can not mark continuity if it is replace the integrated, check other components of the circuit including mosfet. Greetings and luck
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agefito
agefito
agefito
11
hace 5 años

What integrated do you say replace? Thank you!

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Franki Lobaina
hace 5 años

The occilator is the one who must change as it cuts, check the other components of the primary circuit. Greetings and luck

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Ángel Morales
hace 5 años
hace 5 años
Check voltages VCC, VDD (with IC datasheet), MOSFET VP903, VP103, VP901, and opto. Find out how to check if the NB905, NB903 ICs oscillate. Obviously zener shotky diodes, capacitors, and others must also be checked but it is the easiest even without disassembly.
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dni20
dni20
dni20
1.120
hace 5 años
hace 5 años
If the optocoupler is short, the FAN6755 is damaged .... check diodes and resistors associated with the ic ... also note that the optocoupler is not damaged in the secondary .... greetings.
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