Electronics > Repair

What more i can do?

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222Lab_Test222:

--- Quote from: Poroit on November 18, 2024, 05:37:34 am ---
Someone also thought IC7 could be the fault.

--- End quote ---

IC7, Have not check IC7, Its an AND gate logic, data seems good.
If you want i can check again.
What you exactly need from IC7?

222Lab_Test222:

--- Quote from: Poroit on November 18, 2024, 05:37:34 am ---
"I checked all capacitor, no sign of short, the IC looking good, no burn marks as well as any damages."


--- End quote ---

First I checked physically if there is some breakage or burnt mark in capacitors.
Then I shorted the capacitor, and measure capacitance with digital multimeter.
Later someone on forum told to desolder capacitor, i desolder and measure them, seems good to me.

I have no ESR Meter.

Harry_22:

--- Quote from: 222Lab_Test222 on November 18, 2024, 12:27:18 am ---After some cleaning and resetting the CMOS Battery and shorting it, I get D Flip Flop same in Both Working and Not working one.

--- End quote ---

Hi!
Don't worry, it sometime happens.
Compare again the logic on working and non working machine.
You are lucky that have both boards to compare.
Check also the TP (test point).

222Lab_Test222:

--- Quote from: Harry_22 on November 18, 2024, 06:19:50 am ---
Compare again the logic on working and non working machine.

Check also the TP (test point).

--- End quote ---

Do you want me to check remaining pins of IC6 D Flipflop?

TP2 is negative terminal, TP1 is positive terminal, What more i should check.
They are just sorted with the power input pins.
Could it be they have some other purposes?

Harry_22:
Compare again the pins marked by green arrows. Just to shure that no difference in signals exist.

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