Why power supply board only one layer

DDD888

i.e.

http://trademe.tmcdn.co.nz/photoserver/plusw/485831802.jpg

Is the manufacture poor, or select cheapest rubbish component for the high end tv.
http://www.trademe.co.nz/electro ... tion-1150205766.htm

Thanks in advance

Serin

成本控制。

DDD888

Serin 发表于 4-9-2016 18:36
成本控制。

Thanks for answering.

But that answer seems strange.

I paid for my two dell 30 inch lcd monitors at price nzd2,200 year 2008 and nzd1,600 year 2013. That is very dear price I paid for. These company tried to cut corner and cause my lcd monitor can not used more than 3years. I think that I won't buy any dell products.

Serin

DDD888 发表于 5-9-2016 08:49
Thanks for answering.

But that answer seems strange.

不懂你说的是什么意思。世界上有哪个企业是不做成本控制的？

DDD888

Serin 发表于 5-9-2016 09:10
不懂你说的是什么意思。世界上有哪个企业是不做成本控制的？

I am saying the I paid top dollar for the product should not get cut corner design and should not use rubbish components instead of top components on market

DDD888

Serin 发表于 5-9-2016 09:10
不懂你说的是什么意思。世界上有哪个企业是不做成本控制的？

My friend talked me yesterday that european car is better than japanese car as the company use good components in the car instead of once outside the warranty the product broke.

Of course I do not believe him after seeing Germany cheated on car engine using softwares :-)

Serin

DDD888 发表于 5-9-2016 09:24
I am saying the I paid top dollar for the product should not get cut corner design and should not  ...

你的逻辑挺搞笑的。看到单层PCB板就能推断出企业偷工减料，这就和一个人看到可运行程序小就断定软件差一个性质。

DDD888

Serin 发表于 5-9-2016 09:32
你的逻辑挺搞笑的。看到单层PCB板就能推断出企业偷工减料，这就和一个人看到可运行程序小就断定软件差一 ...

No

I did not say single pcb design is bad.

But use lower price capacitor in power supply in lcd monitor is bad. If should use 60a current component, but use 20a current, that is bad. That applies to my dell 30 inch lcd monitor. I am holding the board, the whole board design is like rubbish, not to mention about how difficult to get the board out into my hand.

DDD888

That also applies to samsung tv too.

Serin

DDD888 发表于 5-9-2016 10:01
No

I did not say single pcb design is bad.

你再看看你这个帖子的标题吧。另外，电容都是用电压做标称的，没有用电流做标称的。再说60A，20A，你算过在240V交流电上20A或者60A是啥概念么？你家电表上保险丝或者空气开关的标称电流是多少？

一句话，你想太多了，而且没想对路子。

DDD888

Serin 发表于 5-9-2016 10:54
你再看看你这个帖子的标题吧。另外，电容都是用电压做标称的，没有用电流做标称的。再说60A，20A，你算过 ...

Just for clarification

Here is what I said
If should use 60a current component

capacitor is just one kind of component
resistor is another kind of compoent :-)
If I mention 60a and not linked with capacitor, this means that does not apply to capacitor.

I was just lazy to give you exact item name.

Now, as you insisted that I was wrong. I will give you the name which is Rectifier STPS60170ct
Maximum Continuous Forward Current (A) 60

https://www.arrow.com/en/product ... -+dynamic+inventory

DDD888

Serin 发表于 5-9-2016 10:54
你再看看你这个帖子的标题吧。另外，电容都是用电压做标称的，没有用电流做标称的。再说60A，20A，你算过 ...

Thank you for your reply

Of course I know capacitor, do you know the price of capacitor is based on on certain temperature i.e. 125 c how long last hours on average statics

dell might use the one last 1000hours model
and I paid for last 10,000hours model

DDD888

Serin 发表于 5-9-2016 10:54
你再看看你这个帖子的标题吧。另外，电容都是用电压做标称的，没有用电流做标称的。再说60A，20A，你算过 ...

>>你再看看你这个帖子的标题吧。

That is my question. I do not understand and thank you for your answer.

Serin

DDD888 发表于 5-9-2016 11:25
Just for clarification

Here is what I said

和你说话太累，一方面逻辑转进太快，一方面用英语语法错误太多引起歧义。还是用中文吧，清楚表达意思可以避免浪费时间和精力，也是对别人的尊重。

你现在转到60A的二极管了，so what？你如果计算过电路的那个位置上必须得用60A的二极管而不是20A的二极管，那还是把算式列出来更有说服力。一个电路如果最大通过电流是10A，用20A的二极管就是良心企业了，用60A的企业只有两个原因，要么发痴，要么是因为他们的采购方式可以对60A的二极管拿到更低的价格。

总之，你觉得企业偷工减料，完全有可能。一个显示器几条产品线，面向低端市场和面向高端市场的在设计和用料上肯定有差异。但是得看对方向，别胡扯。

还有你说显示器的电路板难拆，这是废话。显示器的设计本来就不是打算让消费者自行拆机的。计较这种细枝末节也是你没看对路子的体现。

Serin

DDD888 发表于 5-9-2016 11:37
Thank you for your reply

Of course I know capacitor, do you know the price of capacitor is base ...

你这是哪里道听途说的谣言？电容的订价是由出货量、工艺和材质决定的，温度只是被工艺和材质影响的众多特性中的一个，而且还不是主要的特性。电容自己的工作特性决定它不会经受很多的热度考验。你要是举例说零下10C的话，可能还有些想法，因为有些材质的电容低温特性不好。但是你举例说125C…… 工作中的电容能到那个温度的话，周围的半导体元件早都挂了。

DDD888

Serin 发表于 5-9-2016 12:06
和你说话太累，一方面逻辑转进太快，一方面用英语语法错误太多引起歧义。还是用中文吧，清楚表达意思可以 ...

https://forums.overclockers.co.uk/showthread.php?t=18460501

Dell use wrong component and cause the lcd monitor broken just one or two months after three years warranty. May I suit dell? Sure

Can I afford to hire a lawyer to do that? Of course not. I do not have the resource to fight dell in court.

It is good for us to discuss this in English which will help both of us to learn English to survive in au/nz. I am doing you a favour. :-)

DDD888

Serin 发表于 5-9-2016 12:15
你这是哪里道听途说的谣言？电容的订价是由出货量、工艺和材质决定的，温度只是被工艺和材质影响的众多特 ...

I am sure that you don't know what you are talking about and let's not wasting our time to discuss it which you can't use that knowledge anyway in normal life.

But I still admire your knowledge to let you feel happy and not blocking me in the forum :-)

Serin

DDD888 发表于 5-9-2016 12:20
https://forums.overclockers.co.uk/showthread.php?t=18460501

Dell use wrong component and cause  ...

所以说你没吐槽没吐对地方。这个元件的失误和它的标称最大电流一点关系都没有，20A的最大电流妥妥足够了。这个元件的问题是反向电压太小，比60A的那个小了30V。如果是个桥式整流的电路的话，问题出在哪里就很明显了。显然是个在降低成本的过程中产生的设计失误，而不是偷工减料。

Serin

DDD888 发表于 5-9-2016 12:23
I am sure that you don't know what you are talking about and let's not wasting our time to discu ...

电子工程师表示，你的迷之自信很强大。

DDD888

Serin 发表于 5-9-2016 12:38
电子工程师表示，你的迷之自信很强大。

Let's

I am not engineer. I am just forced to repair these rubbish to get my 30 inch lcd back to work and save nzd 2100 and I am not sure that I can success. But I will report my status if you want to know and maybe you can help me. :-)

DDD888

Serin 发表于 5-9-2016 12:37
所以说你没吐槽没吐对地方。这个元件的失误和它的标称最大电流一点关系都没有，20A的最大电流妥妥足够了 ...

I have no idea. I don't know anything about these. I just follow others to repair as good as I can to save money. It will cost me a week's work to get that money saved and I don't want to waste my money.

DDD888

Serin 发表于 5-9-2016 12:38
电子工程师表示，你的迷之自信很强大。

OMG, I regret to say that after knowing that you disclosed that you are an engineer. There are too many people don't know what they are talking about and still insist to talking about that area which is not their expertise area. I am sorry to say that to you.

愚夫

DDD888 发表于 6-9-2016 09:24
OMG, I regret to say that after knowing that you disclosed that you are an engineer. There are t ...

Hi DDD888,

I am so happy that you guys sharing so much info here on the LCD monitor - especially Serin the expert here, honestly I know less even than you.

But I am more interested in the warranty, is your monitor on strike within warranty or out of? My experience told me that it's hard to get anything for free out of warranty - you might be lucky if it's short time out of it.

DDD888

愚夫 发表于 6-9-2016 09:52
Hi DDD888,

I am so happy that you guys sharing so much info here on the LCD monitor - especiall ...

You supported Serlin. So he has more credit now

My first one was exchanged for warranty purpose after three years warranty expired. One month after three year warranty expired and I was arguing that I did not put that monitor into heavy use as I was working full time in office only few times use the item. And I got refurbished one which I was using happily for about six years and in the middle of that six years I managed to replace the semiconductor myself. The first monitor stopped working last week due to bad cap I guess. I paid nzd 110 two days ago for expensive cap and tape and I plan to repair it again.

I repaired two samsung lcd which left on the street myself by replacing some caps several years ago. Both lcd is working fine now.

I bought my second monitor around three years ago. You can see that I have two monitors and you can imagine that I cannot use both at the same time. Since the delivery, the second monitor flash in white background color, I was stupid to not bother it as I thought it is very hard to describe flash to dell support as the flash is very difficult to record on smart phone. Because I got first monitor down last week, I am using my second one, and the issue flashing in white back ground appears again. I have one apple desktop pc, one my own pc and the other work pc. All of them show flashing if connect to that monitor. I check my warranty will expire in this dec for three years warranty. I am in the process of asking for warranty replacement from dell as I found there are lots of other people got same issue as I did in dell support forum. If I don't do the warranty replacement, I will lose the opportunity. I am willing to accept a refurbished one which means used one, broken one and repaired by dell and appears new.

So in short term, my first monitor I used around 9 years
My second monitor I used around 3 years from dell point of view.

From my point of view, my first monitor I used around 6 years 10 hours a day 365 days.
My second monitor only 100 hours I put into use.

DDD888

After these, I think that I won't buy dell products anymore. But I don't know what other brands to buy. Any recommendation?

DDD888

My boss told me that I should not buy an expensive monitor as work purpose. I really should throw away the monitor once does not work. I tried to explain to him that is from my own pocket, not from company's expense. He is willing to give me 2 20inch monitor to use for free which I refused.

I believe big is better, expensive is good. Even I pay myself using after tax income.

Maybe what I believe is wrong, there are so many scams in the world now. I think dell is a scam in some extreme way thinking.

愚夫

DDD888 发表于 6-9-2016 11:28
My boss told me that I should not buy an expensive monitor as work purpose. I really should throw aw ...

Thanks mate for sharing your struggling experience on the sucking scam Dell monitors, probably Dell is doing the same thing with the scam suppliers/factories - just kidding.

Anyway, to share my point here - make life easy, buy something in average level / average value and cost, if unfortunately it gives up working within warranty, then claim a new replacemtn for free. If it's unlucky out of warranty, then throw the garbage away, buy a new (model) one and put the cost into tax return - no BS then.

DDD888

愚夫 发表于 6-9-2016 11:57
Thanks mate for sharing your struggling experience on the sucking scam Dell monitors, probably D ...

Nz is different from Australia.

I am a permanent employee. I cannot claim work expense except sickness insurance can deduct my income. I cannot buy a lcd for work purpose and put the cost as income tax claim.

There is another way which repair yourself and buy good parts, fix yourself. By doing that, you become the master of your own journey.

It is not a big deal anyway. In 1996, I was using softice to modify binary code without source code to remove a time limit based on my boss's request. Without doing that, the company might bank-corrupt. The reward was chinese yuan 2000. I considered the reward too small. Since then I left the company. Don't ask me that story, it was a trade secret.

愚夫

DDD888 发表于 6-9-2016 12:04
Nz is different from Australia.

I am a permanent employee. I cannot claim work expense except ...

Hi buddy, be careful of your words, the NZ has sent a detectives particularly on commercial criminals, make sure you lock your door safe

DDD888

愚夫 发表于 6-9-2016 13:41
Hi buddy, be careful of your words, the NZ has sent a detectives particularly on commercial crimin ...

Thank you dude,

I am not a criminal and I am just a hero who saved the company once. The protected assets was company ip.

I have nothing to hide or worry about.