- CCFL-inverter iMac 20" - 6 Updates
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| Bo-Lennart <bo-lennart.karlsson@telia.com>: Apr 20 11:37AM -0700 Hi all out there. I got an old iMac 20 inch from 2007, with no backlight. I open up the iMac and found the inverter. The inverter is made by DARFON, TW. The modell is: 4H.V2471.001 I check the transistor, diods and so on. I found 2 suspect transistors.Q2 qnd Q4. Two SOT-23. They are labeled: RKM35, I don't know if it's a NPN or PNP or even a mosfet. Is there some one that have worked with this inverter, I mean in component-level. I mailed DARFON, but I got a reply from postmaster, saying that they could't deliver my mail, becouse DARFON inbox is full. Mybee they went out of busnees, and forgot to close the mail-accont. I would appriciate any help from You. Bo-Lennart Karlsson Falun, SWEDEN |
| JC <Chipbee40_SpamNo@yahoo.com>: Apr 21 10:43AM -0400 Bo-Lennart wrote: > I would appriciate any help from You. > Bo-Lennart Karlsson > Falun, SWEDEN some Rohm RK7002 N-CH Mosfets have RKM markings (SOT-32 60V 115mA switching) Mouser sell them but with RKU marking |
| Bo-Lennart <bo-lennart.karlsson@telia.com>: Apr 21 08:40AM -0700 Den måndag 20 april 2020 kl. 20:37:14 UTC+2 skrev Bo-Lennart: |
| JC <Chipbee40_SpamNo@yahoo.com>: Apr 21 11:53AM -0400 JC wrote: > some Rohm RK7002 N-CH Mosfets have RKM markings > (SOT-32 60V 115mA switching) > Mouser sell them but with RKU marking Correction SOT-23 |
| Bo-Lennart <bo-lennart.karlsson@telia.com>: Apr 21 08:58AM -0700 Den måndag 20 april 2020 kl. 20:37:14 UTC+2 skrev Bo-Lennart: > I would appriciate any help from You. > Bo-Lennart Karlsson > Falun, SWEDEN Thank You JC. I think You are right, that it is a MosFet-transistor. I don't have them in stock, so I have to order them. Are You familier with that inverter, made by DARFON? There is a 4-pin connector that supply the inverter with power and control-voltage. Pin 1 = + 12V, Pin 2 = ground, Pin 3 = proberly(?) the brigthnees control and Pin 4 = 3,3Volt They selling these inverter on E-bay, but shipping cost will sometime be more than for the inverter. I've got this iMAC for free, but I don't wanna pay to much to get it up and running. Anyway, the computer is 13 years old. If I got it running, it will not be at the top of iMAC-computers. Bo-Lennart Karlsson Falun, SWEDEN |
| JC <Chipbee40_SpamNo@yahoo.com>: Apr 21 12:04PM -0400 Bo-Lennart wrote: > I've got this iMAC for free, but I don't wanna pay to much to get it up and running. Anyway, the computer is 13 years old. If I got it running, it will not be at the top of iMAC-computers. > Bo-Lennart Karlsson > Falun, SWEDEN No, not familiar, I do a lot of switchers so I get to know a lot of transistor codes. Good luck! |
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| etpm@whidbey.com: Apr 20 12:25PM -0700 On Mon, 20 Apr 2020 14:20:27 -0500, Fox's Mercantile <jdangus@att.net> wrote: >On 4/20/20 1:57 PM, discounts@iphone.bell.com wrote: >> *** iPhone SUPER-SPECIAL-DISCOUNT 80% OFF >Go fuck yourself I randomly checked several newsgroups for sample messages and the above message and the covid message were the only messages. It's like these assholes posted to every newsgroup. What a waste of time. Eric |
| "pfjw@aol.com" <peterwieck33@gmail.com>: Apr 20 01:18PM -0700 Registrant Organization: Domains By Proxy, LLC Registrant Street: DomainsByProxy.com Registrant Street: 14455 N. Hayden Road Registrant City: Scottsdale Registrant State/Province: Arizona Registrant Postal Code: 85260 Registrant Country: US Registrant Phone: +1.4806242599 All of you - report this to: Registrar Abuse Contact Email: abuse@godaddy.com |
| "jfeng@my-deja.com" <jfeng@my-deja.com>: Apr 21 07:33AM -0700 > Registrant Phone: +1.4806242599 Is that telephone number really complicit with this spam? If so, we all should call it and personally let them know how grateful we are. |
| Rob <nomail@example.com>: Apr 21 03:07PM > On Monday, April 20, 2020 at 1:18:22 PM UTC-7, pf...@aol.com wrote: >> Registrant Phone: +1.4806242599 > Is that telephone number really complicit with this spam? If so, we all should call it and personally let them know how grateful we are. Looking at the URL structure this is some service (grex.com) that hosts user accounts (~henced) where someone has hosted a page. That someone may not at all be related to this spam, it may be a hacked account. The article was posted on usenet via another service, but that account already has been shut down. Of course it will be quite easy to create a new account for the next run. |
| Bob Engelhardt <BobEngelhardt@comcast.net>: Apr 17 05:55PM -0400 I have the subject driver & it has excessive leakage current: 20ma more or less. With an 1800 mah battery, that's less than 4 days of shelf life. After I discovered this I thought that I could live with it by not keeping the battery in the driver. That got old REAL quickly - like twice having to put the battery in & remove it after. So I opened it up to see what I could see: https://imgur.com/9ccfxL0 https://imgur.com/VhIN5wY I cleaned the board real well by scrubbing with denatured alcohol (it was pretty dirty - it's 10 years old). No effect, so I tried heating with a hair dryer & cooling with CO2. No effect. It can be seen in the photos that the trigger is more than just on-off contacts & that it can be opened. But I'm worried that there are little springs & such inside and that I'd like to only do that at the last. Are there any components that are likely suspects & are easily checked? I do have an analog scope as well as a couple of DMM's. Any suggestions at all? Thanks, Bob |
| Bob Engelhardt <BobEngelhardt@comcast.net>: Apr 17 10:17PM -0400 On 4/17/2020 7:33 PM, Jeff Liebermann wrote: > start over with a different set of recommendations. >> Thanks, Bob > Good luck. Jeff - thanks for the reply. The driver is a GEN 0, model 2450 ... LiIon battery. The battery is new (the original ones lasted 10 years - no complaints there), model 48-11-2420. The 20ma leakage was measured (DMM). A 12v 10-year-old drill was also measured, for reference, & its leakage was less than a ma. |
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