Re: HP 2311F Monitor: Flashing on & off : Solved
AX6630A was causing my display flashing on & off.
tested it with following reading;
U1 (pcb designation)
AX6630
A-33
1021B
pin 1 = 0 V
pin 2 = 3.28 V
pin 3 = 5.49 V
IR temp reading = avg 41 deg C
Spec states " temp shutdown at 140 C "
i really don't understand the reason but my dummy test pointed out to U1.
the history of this display is unknown when i got it.
( i have no idea how long it had been going on before.)
...
gagaguu
Member
Last Activity: 11-17-2015, 09:11 AM
Joined: 05-24-2015
Location: singapore
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Re: HP 2311F Monitor: Flashing on & off
copy...
U1 is for 5V to 3.3V
and U4 (MT1117) is for 3.3V to 1.8V
i will check for bad joints for those 2 regulators..
thanks.....Leave a comment:
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Re: HP 2311F Monitor: Flashing on & off
I borrowed an IR thermometer and checked every converters, regulators, etc...
it checked out this regulator. It's temp is higher than others.
(but the temp is within it's op temp and i dont understand why)
So i tried the dummy test. put a little thermal paste and Al heatsink.
I tested it the day before yesterday for 4 hours plus. ok..
In fact, i m testing it with that heatsink now..it's over 3 hrs and no flicker...
(during this 3 hrs, i took out the heatsink and it flickers, putting it back, ok..)...Leave a comment:
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Re: HP 2311F Monitor: Flashing on & off : Culprit found but need some advices
Hi all,
I am trying to figure out what's causing my HP 2311F display flicker.
I got really helpful suggestions and advices...
i was following 'BudM's sticky' and it is really an eye opener...
(thank you so much.)
in a nutshell, my monitor was having a LDO regulator, U1 on Logic board, faulty.
For those having same problem as me, you would have a rough idea...
Please refer to the attached datasheet.
(it was thermal shutdown function in action.)...Leave a comment:
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Re: HP 2311F Monitor: Flashing on & off
thanks...ribbon cable was gone from wear & tear...will update..Leave a comment:
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Re: HP 2311F Monitor: Flashing on & off
Negative...i could try thin Al heatsink with Cooler Master paste...but IC packaging would not affect that much on heat transfer rate...any advice?...Leave a comment:
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Re: HP 2311F Monitor: Flashing on & off
Agent24,
Thanks for the advice...but ext psu is supplying 12V it's supposed to...and the monitor is acting normal in first two to three minutes...
rgds,Leave a comment:
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Re: HP 2311F Monitor: Flashing on & off
Budm,
lowering the backlights doesn't change....solder joints are good enough...is it possible that 6180 converter is dying?...i mean thermal shutdown function in works? coz it's normal in the first 2 or 3 minutes and then blinking starts..."porto" recommend replacing the mosfet...should I start with Lelon caps first?
Agent24,
yes..ext PS...but i may never know bad caps cos i don't have ESR meter (n referring to "budm", checking with capacitance meter is not 100% reliable)...Leave a comment:
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Re: HP 2311F Monitor: Flashing on & off
Hi Budm & Porto,
Appreciate the advices...I'm back at home today and will continue finding the fault...My friends discourage me about trying to get it right..but they don't know that it's not about $$$ but the knowledge, the satisfaction and, ofcourse not omitting, the personal achievement. Again, thank you so much for the advices and your time. I will keep you posted...
Rgds,Leave a comment:
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Re: HP 2311F Monitor: Flashing on & off
Hi Porto,
noted. will follow up after i come back. so far, stuck in indonesia for a while..
don't wish to have firework though...
thanks for the advise...
rgds.Leave a comment:
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Re: HP 2311F Monitor: Flashing on & off
Hi Porto,
the mosfet (Q855) is B70N08 and IC (I801) is FP6180 from feeling technology.
data sheets are attached.
i'll check the caps solder joints thoroughly again.
thanks for your time and advice.
rgds....Leave a comment:
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Re: HP 2311F Monitor: Flashing on & off
i've checked the supply. the display acts normal in the first two or three minutes. i starts turning on and off after that.Leave a comment:
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HP 2311F Monitor: Flashing on & off
My HP 2311F monitor is having an issue, turning on and off, after a while. After searching through this forum, I found similar thread (#56) posted by "matt230" on May 2nd 2013. It was suspected bad caps.
Referring to "Bud Martin's guide", I was unable to figure out which caps are not working. The caps look fine by visual (neither bulging nor leaking) but I do not own the capacitance or ESR meter. It would be grateful to have some suggestions which caps might fail.
Followings are the info that I'm able to dig from the monitor:
PSU board: Lelon caps... -
Re: New Members - please post your introductions here
Hi everyone,
Found this very interesting forum. never thought that caps are that interesting.Leave a comment:
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