Electronics > Repair

Help, identify chip D05A SOT23-6

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daisizhou:
Hallo everyone

This is a NEC LCD monitor.After it lights up, it always rolls up and down, it looks like the voltage is unstable.So I tried to replace the capacitor, but I didn't know the specific specifications of the SMD capacitor, so I disassembled the SMD capacitor.The dimensions of the capacitor are 1.6mm x 1.6mm x 3.2mm。
I don't know the withstand voltage and capacity of the chip capacitor,A friend suggested that I look for the surrounding circuit components. I took a picture and found a chip with a SOT23-6 package and the code is D05A.
It looks like a DCDC voltage conversion circuit.
If you know the exact model, please tell me, thanks.

fzabkar:
Qxxx are transistors.

daisizhou:

--- Quote from: fzabkar on September 17, 2024, 07:57:43 am ---Qxxx are transistors.

--- End quote ---
Is it a P-channel MOS tube?

fzabkar:
Examine the datasheet for the PWM controller IC.

daisizhou:

--- Quote from: fzabkar on September 17, 2024, 08:40:38 am ---Examine the datasheet for the PWM controller IC.

--- End quote ---
It seems that the PWM chip should be this one

I found the manual for this monitor, but there is no schematic diagram available

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