tmhobadcap
Senior Member
Last Activity: 02-07-2025, 02:44 PM
Joined: 04-06-2019
Location: Richmond, BC
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Sorry, I do not have the original power adaptor.... -
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Thanks for your comment.
Sorry, I did not post the outer packing of the battery pack. Also, there is markings on the cell, but I just do not know what it means. Here they are.
The markings show 7.7V which I think should be the nominal voltage. Then the maximum or full voltage for each cell should be 4.2V. Did I make a mistake?...Last edited by tmhobadcap; 02-03-2025, 10:18 PM.Leave a comment:
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Thanks for your comments. But they did not answer my question.
My cells are not swollen. When charging, they were cool....Leave a comment:
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Lithium ion cell voltage not going up after 3.8V
I got a chromebook with battery problem. It was charging when plugged in. But the indicator just showed that the battery was below 10% no matter how long it was plugged in. I took the battery pack out. There are two cells in series. Each cell had a voltage of about 3.7V. I charged one of them with a lithium cell charger. I can see current going into the cell at about 500mA. After several hours, the voltage was just about 3.8V. I charged it again manually by connecting 4.2V to it from a power supply and set the maximum current to 500mA. I can see about 100mA going into the cell. But the voltage...Last edited by tmhobadcap; 02-03-2025, 01:32 PM. -
Thank you for this suggestion.
I will try it....Leave a comment:
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Thanks for your suggestions.
Yes, it is difficult to do so with just a soldering iron and soldering wick. Finally, I used a heat gun to desolder it....Leave a comment:
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Thank you!...Leave a comment:
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Any special techniques in desoldering this rectifier?
I need to desolder a bridge rectifier as shown on the attached photos. I found that two of the four holes are different from the other two holes. The middle two holes have something like a metal ring on the hole. Is there any reason for this? When desoldering, is special technique and/or equipment needed? -
Re: Samsung un65h6203af led replacement question
Thanks for your suggestion. I have placed the order for the led strips.
But I still would like to know the answers to my above questions. They would be useful for me in case I have another tv which needs only to replace just a few leds....Leave a comment:
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Samsung un65h6203af led replacement question
This tv is with sound but no picture. When light shines on the screen, we can see the image. This is a typical backlight problem. I opened it and found quite a lot of the leds are damaged. But the damaged ones are all shorted. No one is open. Is there a special reason? (From my past experience, both can be happened)
When I supply 3V to each of the good leds, the currents range from 105mA to 154mA. From these figures, I think the leds are 3V and about 0.5W. I plan to replace all the damaged leds only (because the price of the led strips is very expensive), but I could not find 3V 0.5W...Last edited by tmhobadcap; 10-03-2023, 11:50 PM. -
Re: Asus vz239h-w no display
Sorry, I made a mistake. I mentioned that there were no voltages on all capacitors after turning on the monitor. That is incorrect. I just found that the power plug is loose making no contact at certain angle and so I could not get any voltage. But the no display problem and other founding are still true.
I am now trying to check which components might be defective by following the service manual provided by Lisa Su.Leave a comment:
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Re: Asus vz239h-w no display
Thanks a lot Lisa Su.Leave a comment:
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Asus vz239h-w no display
When I turn on the monitor, the screen does not light up. But when I shine light on screen, the ASUS LOGO image can be seen. But after a few seconds, the logo disappears and the power light turns orange which means standby.
I have checked backlight leds, they are all working. That means not backlight led problem. In other words, there is power to the backlight leds.
I found that when turned on, there is no voltage on all capacitors. So I suspect that something wrong with the chips. I started with the two chips closest to the power input, the one with the markings of "P8019...Last edited by tmhobadcap; 08-05-2023, 04:30 PM. -
Vizio M55-F0 Cannot be turned on
I found this tv's situation is very complicated. It will take a long time for me to tell what I found. Therefore, if you don't mind, before I tell the complete story of what I found, I would like to ask some questions. Of course, if the complete story is needed, I will do so.
The tv cannot be turned on. I found that the heat sink on the mainboard is so hot to touch even if it is just plugged into the wall outlet but without turning on the tv. Does this indicate that something wrong that needs to replace the mainboard or the other boards?... -
Re: Samsung UN60ES6100F black screen with standby led flashing 5 times
Sorrry, finally I did not fix it....Leave a comment:
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Re: Hisense 58H6550E - Freezes/Won't turn on
Like this post ([url]https://www.aliexpress.com/item/1005003960973294.html?spm=a2g0o.cart.0.0.732938da8sYbgY&mp=1[/url]), they have different diameter for the balls. Which one should I choose?Re: Hisense 58H6550E - Freezes/Won't...ould I choose?Re: Hisense 58H6550E - Freezes/Won't turn on
...Leave a comment:
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Re: Hisense 58H6550E - Freezes/Won't turn on
From the codes on the chip, I can find the datasheet [url]https://www.datasheets.com/en/part-details/h26m52208fpr-sk-hynix-inc-98770818#datasheet[/url]. But on the datasheet, I could not find the stencil size and ball size. Can you give me more hints on how to find the stencil size and ball size?
One more question. This chip was programmed by Hisense. But the one on the market is not programmed, therefore, I can buy one and replace the current one. Am I correct? Or if there is a way to program the chip? Or will...Last edited by tmhobadcap; 02-19-2023, 09:25 PM.Leave a comment:
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Re: Hisense 58H6550E - Freezes/Won't turn on
It seems that there are different sizes of solder balls and stencils. How can I know which size is for this chip?...Leave a comment:
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Re: Hisense 58H6550E - Freezes/Won't turn on
As per Diah's suggestion, I should add heavy weight load to the chip while reflowing. Since it is so small, I could only think of pressing the chip with tweeters at the end of the reflowing. I tried several times (maximum temperature setting was 375°C but the results were just the same (Hisense logo appears for a few seconds). I found that the chip could not be moved at 375°C, so I thought may be the temperature was not high enough. I raised the temperature setting to 425°C and tried a few more times, but the results were the same....Leave a comment:
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