Re: 204B freezes after caps replace
Hooray, I've fixed it! I was right all along - EEPROM A81SC (24C08) got corrupted (probably due to the wild voltage swings because of bad caps).
So shorting pins 5 and 6 while turning the monitor on, cleared it and the monitor stopped freezing!
tom66, thanks for the info!
ztrekr
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Last Activity: 06-21-2012, 06:55 AM
Joined: 06-03-2012
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Re: 204B freezes after caps replace
UPDATE: I haven't replaced the caps with low ESR ones, but managed to measure the voltage from the power supply to the microcontroller board - it stays the same all the time (from turning on to "freezing") - 13.06-13.07 V (specs require 13 V).Leave a comment:
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Re: 204B freezes after caps replace
Yes, I'm in Europe, but not in the UK.
Ok, then I will try to find proper capacitors, replace them and see what's going to happen....Leave a comment:
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Re: 204B freezes after caps replace
Well, you guested wrong
It seems that the B model is also available outside US - I have a 220 V grid.
Ok, got it, thanks. I will try to find proper replacement caps here.
Until then - is there a way to reset EEPROM on the board somehow? I think its settings just got corrupted and that's why it freezes. I have 0.1 rev board....Leave a comment:
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Re: 204B freezes after caps replace
"If you don't provide info I won't help" IS blackmail.
Childish, unreasonable blackmail, because my country and mains voltage have nothing to do with the problem at hand....Leave a comment:
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Re: 204B freezes after caps replace
Yeah, like you're gonna be liable if I die poking inside my monitor... Let me worry about my own safety.
What are you, some kind of racist? What's with this laughable blackmail?...Leave a comment:
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Re: 204B freezes after caps replace
What my country and mains voltage have to do with anything?
The problem was standard "2 seconds to blackness" problem....Leave a comment:
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Re: 204B freezes after caps replace
Today I've found out that my replacement caps are probably not low ESR
They are Jamicon TK series:
[url]http://www.icd-sales.com/Manufacturers/Jamicon/Capacitors/tech-docs/jamicon-series-table.aspx[/url]
How critical is low ESR? Is it possible that this can cause freezing of the microcontroller board in my case? As I said, the back-light seems to be working fine...Re: 204B freezes after caps replace<...w ESR :(<br />Leave a comment:
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Re: 204B freezes after caps replace
Of course I've checked all the trivial things before posting
Polarity, soldering, wires...
I even went so far as to replace the capacitors yet again with a new bunch of fresh ones, in case there was a factory defect in one of them or bad soldering.
Anyway, the back-light now works perfectly, so I guess the power supply unit is now Ok and the problem is probably in that other board that is responsible for actual displaying. I think some internal microcode or settings got corrupted.
I've seen...Leave a comment:
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204B freezes after caps replace
I've replaced all 820, 330 and 47 uF caps in my Samsung SyncMaster 204B and now the back-light turns on.
But as soon as it turns on, the monitor "freezes", i.e. doesn't respond to the power button on the front panel and no image is displayed - just blackness.
Before the light goes on the power button is operational, but I can't see the menu or anything. But as soon as the back-light activates, the button stops working (the blue light on the button still on).
Also the humming noise inside the monitor stops as soon as the light goes on.
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