Re: 42mf231d/17 works when heated
I can't get solderwick to work for me and for what I need it should work fine.
I can't get solderwick to work for me and for what I need it should work fine.
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Re: 42mf231d/17 works when heated
When I remove the component off the board, I will add more solder to the pins while rocking on the part to remove it off the board, then I use solder sucker to remove the solder later.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: 42mf231d/17 works when heated
I took the board off and put the caps on it. I also found alot of bad solder on it. I touched up the spots that didn't look right. But it still does the same thing. Althought it seems to take less heat to start or that could be wishful thinking. So I'm going to pull it back off and touch it up again. There are some surface mount parts on it that I didn't do. I'll try to touch up all of them.
The desolder iron I got works pretty good. No instructions but not hard to figure out.
The pics are as close as I can get. But you can still see some of the bad solder.Attached FilesComment
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Re: 42mf231d/17 works when heated
After touching up the board again I'm now getting nothing. I've found a broken power switch on the main supply. The set went dead due to over heating. The person I'm looking at it for let the back get completely plugged. The markings are gone from the switch but the one on the sink next to it is a Fairchild KA5L0365R. So I think that is the numbers. I have a KA5L0565R and a KA5M0380R. I've looked at the datasheets and they are close. Can I try one of these? If not or it doesn't work I'm going to get another board from shopjimmy.
http://cs.utsource.net/goods_files/p...LD_5L0365R.pdf
http://monitor.espec.ws//files/ka5l0565r_203.pdfComment
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Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: 42mf231d/17 works when heated
I've checked the manual it doesn't it. I'm sure about the numbers. There are three heat sinks on that side of the board. There is a 365 on one end of the other two.Comment
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Re: 42mf231d/17 works when heated
I now have a problem with the Va. I have 70v at the test point on the board and the plug next to it. At the next plug I only get about 15v. Which parts should I be testing first or the most likely to be the cause? ThanksAttached FilesComment
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Re: 42mf231d/17 works when heated
I found the following are reading short on diode test. The other VR's read ok. Can the VR be bad or would it be something else?Attached FilesComment
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Re: 42mf231d/17 works when heated
My reading was wrong in my other post. I haven't worked on this for a while so have not updated. I think the PS is fixed. I've found a bad lower buffer IC. Can the PS cause this or did the PS cause the main to short then the buffer? Also what's holding the heat sink on the IC? I haven't tried to get it off yet. The lower buffer tested 51.5 ohms and the upper tested 125.6 ohms.Attached FilesComment
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Re: 42mf231d/17 works when heated
The heat sink came off OK. I can get the ic but I"m not going to attempt a repair with out a heat gun or better still a hot air station. So this thing is on hold for now.Comment
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Got a case of something new weird at work. There is an old 2nd gen Intel i3 in an old “Pizza box” shell that has a small form factor power supply. Unfortunately I forgot to take pictures and model number off it.
Anyway, I get to work and get to look at this computer. Standby LED on the PSU is on, but the computer won't start. Hmm o.k. take the battery out of the main board try again, nothing.
O.k. then… unplug the power supply from the main board and put in a full size ATX PSU (yeeeesss! Exact that blown Powerman IP that I fixed a while back), plug it in and the old...
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Hi everyone,
I'm working on a MacBook Air 2020 (A2337, board 820-02016) and running into a strange USB-C issue. I've gone through quite a bit of testing and part replacement, but I'm stuck — hoping someone here can shed some light.
🛠 Original Issue
The machine initially wouldn't negotiate 20V over USB-C — stuck at 5V.
Diagnosis showed PP1V5_UPC0_LDO_CORE shorted to ground.
I replaced U3100 (UF400) using a donor board (A2179), and the machine powers on fine now.
⚠️ New Problem: One USB-C Port Only Works in One Orientation... -
Hello mates,
I bought this subwoofer a few days ago used and blind and it works erratically, as far as I could see, it has been tampered with, the speaker is not the original one and of 8 Ohm when it should be of 4, and there are some welds like reworked by the boards.
It doesn't have much power (expected more from it) and it distorts if you increase the volume over the middle, maybe it's because of the high impedance of the speaker. The problem is that it has sound when it wants, the led panels all work correctly, you can hear the power relay on power on, but right now... -
Hi, so i guess I´ll have to make a new topic here, as i browsed through hundreds of other threads but couldn't find a solution to my problem yet.
I got a EIZO CX270 from a friend. He said it doesn't work anymore and wont display any signal or take any OSD inputs. Well, as an aspiring photographer I couldn't say no, could I? Thought it was an easy game, replace a bad cap and have a working monitor. But nooope, it wasn't supposed to be this easy.
So let me start with the problem description. I'll try my best not to skip anything so this might get rather long.
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Lenovo Thinkpad W541 Wistron LKM-1 WS MB 12291-2 Works from the network and charges the battery only when it is turned off.
If you press the power button, the laptop turns on and works from the battery, but does not take power from the power supply.
If you boot into Windows and close the lid while working, thereby putting the laptop into sleep mode, the laptop begins to charge the battery.
even checked it this way: I bring a neodymium magnet to the Hall sensor during operation - the screen goes out and the battery starts charging.
Also, the laptop does not turn on without...
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