Chimei CMV 221D - doesn't power on

[funkster]

Re: Chimei CMV 221D - doesn't power on

I thought I'd try and desolder the two U6 & U7 chips and swap them to see if it is indeed faulty and to see if the voltage changes to the other. As soon as I change it and plug the power back in, bingo the power light turns on & also screen turns on now I measure the voltages and for some reason both now are reading 3.3V, even the one that was reading 2.41V.

I then quickly plug in the DVI cable to see if it shows anything on the screen, but just my luck it only shows white on the screen now, no menus or anything

edit: to be exact the one that was fauly is now reading 3.17V, and then other now 3.26V

[retiredcaps]

Re: Chimei CMV 221D - doesn't power on

I then quickly plug in the DVI cable to see if it shows anything on the screen, but just my luck it only shows white on the screen now, no menus or anything

white screen => recheck your cable connections from the logic card to the lcd panel. Make sure both sides are connected properly.

[funkster]

Re: Chimei CMV 221D - doesn't power on

white screen => recheck your cable connections from the logic card to the lcd panel. Make sure both sides are connected properly.

Even though, I hadn't disconnected them, I reseated them and measured some pins for resistance from the logic board to the screen and it seems okay. Still white screen though. Perhaps the U7 now at U6 position is still faulty reading @ 3.17V?

[funkster]

Re: Chimei CMV 221D - doesn't power on

I thought I'd be a bit daring and bridge the two U6 & U7 +3.3V middle pins together with a wire so as to elevate the other from roughly 3.1V to 3.3V and the screeen shows picture now

My question is, is it okay to run like that, or should I get a replacement? & if I get a replacement can someone help me find an equivalent chip from ebay?

http://shop.ebay.com.au/i.html?_nkw=....c0.m270.l1313

Oh and thanks all your guys for your kind help these past days. *cough* where do I send the cheque haha

[alexanna]

Re: Chimei CMV 221D - doesn't power on

I thought I'd try and desolder the two U6 & U7 chips and swap them to see if it is indeed faulty and to see if the voltage changes to the other. As soon as I change it and plug the power back in, bingo the power light turns on & also screen turns on now I measure the voltages and for some reason both now are reading 3.3V, even the one that was reading 2.41V.

I then quickly plug in the DVI cable to see if it shows anything on the screen, but just my luck it only shows white on the screen now, no menus or anything

edit: to be exact the one that was fauly is now reading 3.17V, and then other now 3.26V

Which one is reading the 3.17,what position on the board?
Al.
sorry i missed your edit

[PlainBill]

Re: Chimei CMV 221D - doesn't power on

I thought I'd be a bit daring and bridge the two U6 & U7 +3.3V middle pins together with a wire so as to elevate the other from roughly 3.1V to 3.3V and the screeen shows picture now

My question is, is it okay to run like that, or should I get a replacement? & if I get a replacement can someone help me find an equivalent chip from ebay?

http://shop.ebay.com.au/i.html?_nkw=....c0.m270.l1313

Oh and thanks all your guys for your kind help these past days. *cough* where do I send the cheque haha

Definitely do NOT run with the jumper!!! If you had worked for me I would have boxed your ears for even considering it!!! Replace both of them. Either your meter is out of calibration, or both are defective. The spec on these chips is +- 1% of their rated output.

Some of the parts on eBay are correct, you want a part rated at 1A, not 800mA. Also, it must be the SOT-223 package, not TO-220 or some of the others. This auction combines factors I consider important - Correct part, Excellent feedback rating, low shipping cost.

Oh, and do NOT try using the monitor until the parts come in. There is always a chance of corrupting one of the memory chips on the logic board.

PlainBill

[Toasty]

Re: Chimei CMV 221D - doesn't power on

ST Micro. - LD1117AS33TR

DigiKey has it:

http://search.digikey.com/scripts/Dk...=497-1228-1-ND

as does Mouser:

http://www.mouser.com/ProductDetail/...XsRjw3YqNjM%3d

Toast

[PlainBill]

Re: Chimei CMV 221D - doesn't power on

ST Micro. - LD1117AS33TR

DigiKey has it:

http://search.digikey.com/scripts/Dk...=497-1228-1-ND

as does Mouser:

http://www.mouser.com/ProductDetail/...XsRjw3YqNjM%3d

Toast

Really only practical if he's in the USA. Since he posted a search he made on eBay Australia, I suspect he's looking forward to Summer starting in a few weeks.

What!!!! You didn't read Sherlock Holmes when you were a kid?

PlainBill

[Toasty]

Re: Chimei CMV 221D - doesn't power on

a) I failed the ESP class in school...
a) There's this funny little field in the Member Profile form called LOCATION.
b) The cross reference info might help someone find the part. I found it on a RC model site.
d) All the ones on eBay (no matter what country) seem to come out of Hong Kong.
e) I AM Moriarty

Toast

[PlainBill]

Re: Chimei CMV 221D - doesn't power on

a) I failed the ESP class in school...
a) There's this funny little field in the Member Profile form called LOCATION.
b) The cross reference info might help someone find the part. I found it on a RC model site.
d) All the ones on eBay (no matter what country) seem to come out of Hong Kong.
e) I AM Moriarty

Toast

Hmm, maybe you also failed the alphabet ( Your points are 'a', 'a', 'b', 'd', 'e' ). However, in the spirit of the season, here are the responses.

a) ALL guys fail intuition. Marriage solves that. I know no matter what goes wrong, it's my fault.

a) Yes there is. And you and I are nice enough to have filled in that field. Others haven't. I considered asking Topcat to make that field mandatory, but decided not to go there.

b) I found the specs by Googling the original part number. This gave that information that it was a 1A regulator. After that, there are dozens of sources.

d) Almost everything comes out of Hong Kong. According to the WSJ, next year they are going to start shipping babies to the US. Walmart is already planning on stocking them.

e) So who died at Reichenbach Falls?

PlainBill

[funkster]

Re: Chimei CMV 221D - doesn't power on

Thanks once again all you guys, I have ordered the 10 pack of regulators recommended on ebay by PlainBill. Should we consider this thread solved until they arrive which should be in around 1-2 weeks?