BEKO AC remote faint response

starLED

Member
My BEKO AC remote has a faint LCD display and when I press the buttons display is fading and remote is not that responsive. I have to click couple of times to get AC running.

I have disassembled the remote, and found three suspicious black capacitors.
It seems that two bigger one 16V have leaked, one of them seems to have a hole near the top.
The smaller one I am not sure if its bad.

Can someone confirm visually if they are bad and can they cause these problems?

Thanks.

 
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I replaced all 3 caps, but the LCD screen is still faint.
Buttons are more responsive now.
The old caps have good capacitance.
Could it be the zebra stripes are bad?
There are no missing segments on LCD, the whole LCD is faint.
I pressed the LCD screen on the sides, segments do get bright, but not the whole LCD.
What can be an issue, besides zebra stripes which I will not try to replace?


 
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Zebras definitely need cleaning, common problem. Also when caps fail, if they
fail short they can take out other components, so trace out that and their
surrounding components.
 
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I measured resistors in circuit and found two that I am not sure if they are good.
R3 = 105 is measuring 2M ohms and with reversed leads is measuring 250K ohms.
R11, which is above R3, is also 105 and it's measuring 1M ohms.
R2 = 1R8 is measuring 2.8 ohms instead of 1.8.
Is this a problem?

 
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LCD screen is still faint, and buttons also not very responsive.
I have to press couple of times to get AC running, though LED IR light is always flashing when button is pressed, so maybe voltage is lower in the circuit then normal.
I looked at the traces, but can't see any damage on them.
Could be a faulty resistor maybe?
 
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It's a copper wire that I've put earlier to get better battery contact, because spring is a bit corroded, and I thought that was the cause of the issue.
It isn't though, but I didn't remove that wire.
 
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LCD contrast is regulated by design with a DC voltage differential and sometimes with a pot.
Not knowing the pins is a disadvantage. But pressing your fingers of the pins to change the low current bias to pullup may or may not locate it depending on driver impedance. Eliminate any causes of surface leakage.
 
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