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CrossOver 27Q LED/LED-P, 27M LED, & 2720MDP GOLD LED Monitor Club - Page 289

post #2881 of 6483
Hey i'm wondering if your seller (tha_planet) doesn't take your screen back to rma it . Could you ask with another seller if they may rma the screen?
Or do you need to ask only the person who sells you the screen to rma it ?
post #2882 of 6483
I am another member of team Crossover that got hit with a hot MOSFET. I just registered to share my input.

Purchased in June from Bigclothcraft, fast shipping and good communication.

Fast-forward to the end of August, started having some intermittent flickering issues that would happen for a second or two at a time then go away. I sent a message to BCC and he responded very quickly and offered to send a replacement power brick. I accepted his offer and the power supply arrived 2 days later.

I used the new power brick and everything seemed fine for a couple of days until my monitor's screen would go dark (backlight would go out but power light would still be blue). I could tell this was linked to the backlight brightness as it would only happen when the backlight was anything above the minimum setting. Video here: http://www.youtube.com/watch?v=X0bjwnEI-Lw

I explained the issue to BCC and he authorized sending the monitor back via his account with DHL.

Seeing how many others had this issue with the mosfet on the LED power board I decided to crack my panel open and have a look:





Toasty.

So I dug up an old mosfet heatsink from a graphics card, cleaned the heatsink and mosfet with some rubbing alcohol, applied a tiny dot of Arctic Silver to the mosfet and temporarily secured it to the board with some double sided foam tape.



I hooked everything up and at first it seemed it didn't work (monitor would die if brightness was turned up). I tried power cycling the monitor a few more times and then it just worked, the monitor would stay on on the highest brightness. The heatsink did get hot to the touch so there is some definite need for some cooling.

I am going to attach the heatsink more permanently, I'm thinking a couple dots of epoxy on the corners and some Arctic silver in the middle of the mosfet, however I am open to suggestions smile.gif

I am going to let BCC know about the issue and maybe we can both save some time and money by just getting a new LED driver board shipped out. Has anyone received a replacement board from any seller yet?

I heard a member say they didn't have a blue PCB for the LED driver board and instead a green one so I assume Crossover is aware of the issue and are using a different board on the newer panels they are shipping out.

edit: found a datasheet for the 18T10GH MOSFET used on this board, has a maximum operating temperature of 150 degrees Celsius and judging by the charring on most people's boards its hitting that upper limit.
Edited by Teo14 - 9/27/12 at 4:05pm
post #2883 of 6483
Quote:
Originally Posted by Teo14 View Post

I heard a member say they didn't have a blue PCB for the LED driver board and instead a green one so I assume Crossover is aware of the issue and are using a different board on the newer panels they are shipping out..

I cracked open my monitor to mod a heat sink for the board as a precaution to prevent it from failing. However the pcb is green and has different component layout compare to the pcb's that have a blown mosfet.



I have had the monitor for almost a month now. The pcb is not burnt nor anything is implying damage caused by excessive heat. Couple of "weird" things here though. Capacitors are not "solid" opposed to those blue pcb and they are made by Sam Young which is south korean corporation i believe. They are rated at 85 degrees celcius. I thought that in this kind of electronics they would always be rated at 105 degrees celcius? Anyway, i hope this pcb is of better quality so i don't have to ask the seller for a new one.
post #2884 of 6483
Quote:
Originally Posted by Teo14 View Post

I am another member of team Crossover that got hit with a hot MOSFET. I just registered to share my input...

Teo14! Thank you so much for this post! I bought my Crossover 27Q LED-P from red-cap on July 23 (so its been about 2 months now). Could you please mention what power brick you were using? I received a Loadus power brick (190V-220V), and decided to purchase a step up transformer from Amazon for about $20 after about 5 days of usage. The monitor ran cooler, and I have not had any issues so far (knock on wood). I wish to take a nab at opening this monitor and applying a heatsink to the MOSFET, so are there any other chips that need to be cooled also in your opinion?

Thanks in advance buddy!
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post #2885 of 6483
Quote:
Originally Posted by ghabhaducha View Post

Teo14! Thank you so much for this post! I bought my Crossover 27Q LED-P from red-cap on July 23 (so its been about 2 months now). Could you please mention what power brick you were using? I received a Loadus power brick (190V-220V), and decided to purchase a step up transformer from Amazon for about $20 after about 5 days of usage. The monitor ran cooler, and I have not had any issues so far (knock on wood). I wish to take a nab at opening this monitor and applying a heatsink to the MOSFET, so are there any other chips that need to be cooled also in your opinion?
Thanks in advance buddy!

Could you link the power supply you purchased?
post #2886 of 6483
Quote:
Originally Posted by Descadent View Post

well it is 2:40 am over there at the time of writing this.

i meant 2 days. and they usually reply in the evenings (KST)
post #2887 of 6483
Quote:
Originally Posted by Karail View Post

I cracked open my monitor to mod a heat sink for the board as a precaution to prevent it from failing. However the pcb is green and has different component layout compare to the pcb's that have a blown mosfet.


I have had the monitor for almost a month now. The pcb is not burnt nor anything is implying damage caused by excessive heat. Couple of "weird" things here though. Capacitors are not "solid" opposed to those blue pcb and they are made by Sam Young which is south korean corporation i believe. They are rated at 85 degrees celcius. I thought that in this kind of electronics they would always be rated at 105 degrees celcius? Anyway, i hope this pcb is of better quality so i don't have to ask the seller for a new one.

Thanks for the info and the pictures Karail. It is quite odd not to see solid capacitors. Maybe thats what we get with these displays, expensive A- panels and cheap components that drive them redface.gif
Quote:
Originally Posted by ghabhaducha View Post

Teo14! Thank you so much for this post! I bought my Crossover 27Q LED-P from red-cap on July 23 (so its been about 2 months now). Could you please mention what power brick you were using? I received a Loadus power brick (190V-220V), and decided to purchase a step up transformer from Amazon for about $20 after about 5 days of usage. The monitor ran cooler, and I have not had any issues so far (knock on wood). I wish to take a nab at opening this monitor and applying a heatsink to the MOSFET, so are there any other chips that need to be cooled also in your opinion?
Thanks in advance buddy!

You're welcome!

My monitor originally shipped with a LODUS power brick which ran quite warm. When I started having troubles with the monitor BCC sent me a Weltronics brick as a replacement I'm not sure whether this one ran cooler or not as I wasn't able to turn up the backlight on the monitor without it turning off.

Other than the one mosfet that seems to be failing on everyone I'm not sure if anything else requires cooling. I'm not even convinced now that it is a lack of cooling that is causing it to fail...

Maybe one of the ebay sellers can give us some insight as to how Crossover is dealing with the issue. Is there a recall? Are they shipping out replacement boards for those monitors that have the fault? Maybe they are doing nothing at all and the ebay sellers are having to source replacement PCBs themselves?
post #2888 of 6483
Quote:
Originally Posted by Descadent View Post

There is no reason to buy a pixel perfect with their policies.

What do you mean by that? That dead pixels aren't a big deal, or that every monitor they sell is pixel perfect?
post #2889 of 6483
Quote:
Originally Posted by TechnoChocolate View Post

What do you mean by that? That dead pixels aren't a big deal, or that every monitor they sell is pixel perfect?

all 3 of mine none pixel perfect and no dead pixels. Plenty of others reported like that as well from AW as they sell A panels not A- and have less than 3 dead pixel policy vs other sellers are A- and 5-12 dead pixels depending on seller
post #2890 of 6483
Quote:
Originally Posted by Descadent View Post

all 3 of mine none pixel perfect and no dead pixels. Plenty of others reported like that as well from AW as they sell A panels not A- and have less than 3 dead pixel policy vs other sellers are A- and 5-12 dead pixels depending on seller

That's encouraging, but I want guaranteed zero, not just probably zero.

That said, AW's selling cheaper pixel-perfect monitors all of a sudden, so maybe I'll go with that, if this dream-seller situation doesn't work out.
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