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[Solved] How to fix M24E14 M24EI4 power supply board

qwe1234 580 November 10, 2009 at 11:25 PM
My Soyo 24 monitor that I bought last year at a geeks deal has just died on me today.
Its internal power supply, which most likely is a problem, M24E14 great wall, is nowhere seems to be found but the taobao.com web site.
The zener ZD1 has burned out therefore likely some other components dead too.
Solved by substitution a USA made generic PSU that has required voltage.
Quote from bizcards View Post :
I replaced (adapted) the ZD1 with an axial 30V 1 watt zener diode (to prevent overheating) and it worked like a charm, just watch out for polarity when replacing it. I also replaced a couple of bulked top caps under one of the heatsink.

I hope this will help you as well

Regards

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#16
Quote from qwe1234 View Post :
Right, but will they ship? And if so how to pay... Probably post a new topic at a deal talk on how to order from China.

I have no electronic equipment at my current location, therefore, probably a substitutional PSUs are most feasible solution. Using a 26 HDTV, which Irvin bank has sent, as a monitor for now.

BTW, the capacitors forum asks for a login to view the pictures, and the great wall site does not work
If you can find someone that reads/writes english or you can read/write some common language, then I bet you can get one of the sellers to ship to the states. One site I looked at used 'Alibaba pay' or something like that and mentioned Hong Kong and Taiwan. They also looked like they took credit cards and Bank Transfers (they had about 12 but none of the logos looked familiar).

If you start another thread about ordering from China, link it here so we can follow it. I have bought stuff from Meritline that was shipped via Air from Hong Kong (technically China) and they shipped it dirt cheap (free).

Great Wall site worked for me just now - try again ...they even have an 'ENGLISH' tab.

Yeah, I had to register to see the pictures.
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#17
Great idea linking.

I believe the HK and China are defferent as HK has paypal. And even if Chinese sites list credit cards, the bank issued needs to be in China, similar to US sellers won't take Chinese CC online.

Copied the pictures from the capacitors web site for the convenience.


Here is the screen of the great wall link doesn't work. But thanks for the email. Hope they reply. I tried to send messages to the sellers in the OP's links but got to reply. Probably they can not ship here.
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#18
Here is what I get when I click the link:

and here is the link when you click the 'English' tab:
http://www.gwoversea.com/

and the picture attached.
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#19
Thanks for the link. It has a Tel :86-755-26639997-2315. I will call next week as there is now 4 am Saturday morning. They did not reply to the email you kindly posted last time.
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#20
I am glad I found this thread! I am trying to repair one of these power supplies from a Soyo Topaz S monitor. This one just keeps blowing fuses like someone else stated. This thing is the monitor from hell... the power supply is really not all that complicated, but for the life of me I can't find the culprit. The heatsinks covering all of the components is a horrible design too, and there is no thermal dissipation to speak of, I am lifting traces left and right.

Anyway, here is a short description of my problem and what I've tried; hopefully it may help someone. I was told that this monitor just 'popped' one day and would not power back on. I immediately saw that the fuse was blown, the large mains filter cap was bulged, and the transistor at U6 (weird 7-legged chip- TNY266PN) was blown in half. I replaced all of those, as well as all of the 8 and 10 mm caps on the output. They were not visibly blown, but I replaced them with Nichicons for posterity. Plugged it in, immediately blew the fuse. Next I replaced both of the MOSFETs on the first heatsink- FQPF13N50C and FQA10N80C, blew the fuse again. Rectifier tests good, all through-hole diodes test good, all surface mount diodes and zeners on the bottom of the board test good (even ZD1 which many had reported being burnt).

I am at a loss with this thing. If anyone gets any info from Great Wall, please do share. I am going to try to enlist some help on Monday from someone who can hopefully read these other Chinese pages that come up in Google. A lot of these Chinese manufacturers / distributors will only sell in large quantities. If that is the case, I am willing to organize a group buy (within reason).
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#21
Here are some pictures from the following link [google.com] that show the "REV 311" board:

This board looks substantially different. The heat sinks are much smaller and there are 3 - which considering how hot this thing gets and that most, if not all, of the problems that we are experiencing are related to thermal issues, makes me think this MAY not work. Then again, to be optomistic, they may have improved the design to reduce temps and improve efficiency (heat is a waste product). Also, the board is either wider than our boards OR the mounting holes and 120VAC plug are in different positions - I'm looking at the mounting hole next to the 120VAC plug.
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#22
Nice find - You are right, I think it is wider. If you look at the proportions of the components I think all of the mounting holes and the AC plug are still the same, there is just a bit more length on one side. Based on how it sits in the monitor though I don't think the extra length will be a problem.
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#23
Quote from Player-2 View Post :
Nice find - You are right, I think it is wider. If you look at the proportions of the components I think all of the mounting holes and the AC plug are still the same, there is just a bit more length on one side. Based on how it sits in the monitor though I don't think the extra length will be a problem.
My conclusion, also.
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#24
From the google link with the pictures above (thanks for them), doesn't sound promising to me. I have never taobaoed orders. Means they have no paypal.


Order Tel: 0755-89802141 orders QQ: 821588008 QQ: 346251022
配件选购中心:http://www.3ctool.cn Parts Optional Center: http://www.3ctool.cn
地址:深圳市福田区振华路海外装饰大厦3栋2单元207室 Address: Futian District, Shenzhen Overseas Decoration Building, Zhenhua Road, Unit 207, Room 3 2

广东省内客户可以DDS代收货款免去到银行排队的麻烦外地客户可以通过淘宝订货保证全程货物安全 Guangdong Province, customers can collect money DDS eliminates the trouble of queuing up outside the bank customers can Taobao order to ensure full security of goods
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#25
Quote from qwe1234 View Post :
From the google link with the pictures above (thanks for them), doesn't sound promising to me. I have never taobaoed orders. Means they have no paypal.


Order Tel: 0755-89802141 orders QQ: 821588008 QQ: 346251022
配件选购中心:http://www.3ctool.cn Parts Optional Center: http://www.3ctool.cn
地址:深圳市福田区振华路海外装饰大厦3栋2单元207室 Address: Futian District, Shenzhen Overseas Decoration Building, Zhenhua Road, Unit 207, Room 3 2

广东省内客户可以DDS代收货款免去到银行排队的麻烦外地客户可以通过淘宝订货保证全程货物安全 Guangdong Province, customers can collect money DDS eliminates the trouble of queuing up outside the bank customers can Taobao order to ensure full security of goods
Don't know how China/Taobao works, but I can't imagine that if someone were to actually get in contact with someone that had these, that a way couldn't be arranged to exchange money (American) for Power Supplies.

Also, if you do actually call the Great Wall Company and they don't offer them for sale directly, ask them for contact info (phone/email) for a distributors (plural) that might/do.

Here, for posterity, are the other two pictures from the Bad Caps forum. One is of the logic board and the other is the inverter board (powers the fluorescent tubes).
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#26
I, however, can imagine that easily, because American online merchant won't take foreign credit cards. Don't ask me why I know. And how many ebayers ship overseas? This will involve westernunion money transfer at best. Means healthy fees and no protection if something goes wrong, i.e. your local post man brings thing to your porch and it gets stolen by a neighboar.
BTW, the monitor has 2 more boards with the keys and another board.

I also disagree with a poster above saing this is difficult to disolder. While the heatsinks are the obsticuls, the components assembled with less then military grade, have no compaund cover and accesible all. Also all the thing does is simply supply the power. Try to connect an external supply for 24, 12, and 5 volts and avoid this. Take one standard PC PSU from some old computer and connect -12V as a ground and +12V as +24 Volts. Take another one for +12V and +5V. Isolate them from each other and from the green power line.
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#27
The only two other boards that I know of are the power switch/power LED board and the and the mode select/user interface board. Neither of these am I worried about ...push buttons and an LED are not big problems in my book.

Yeah, the big obstacle is removing the heat sink to get at the components underneath.
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#28
There is another board that the flat cable visible at your left picture connects to.
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#29
Quote from qwe1234 View Post :
There is another board that the flat cable visible at your left picture connects to.
I believe that is the actual display ...not really a board, so to speak, but don't actually know for certain as the cable and connector are covered by tape.
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#30
No, there is a board in between the cable and the display holded with 4 screws.
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