I first thought this was bad power supply caps but the power board tests OK. When connected to the DVI input the video is jumpy and noisy. However when connected to the VGA input it works fine.
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Re: IBM 6736-hc9 bad DVI input
Update, When turned on cold the image is jumpy on both DVI and VGA once warmed up for 30 min or so it seems to work ok. Tested all the power supply caps for ESR and they all look Ok. -
Re: IBM 6736-hc9 bad DVI input
Check the capacitors on the motherboard.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: IBM 6736-hc9 bad DVI input
OK Thanks,
I already checked that caps on the power board and all were good. I am now looking at the main Video/motherboard and have found a couple of caps with high ESR. Not sure if I have replacements on hand. Will post back later.Comment
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Re: IBM 6736-hc9 bad DVI input
The 2 larger 470uf caps on the main video board test high ESR, I have an order for these in shipping.Comment
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Re: IBM 6736-hc9 bad DVI input (SOLVED)
As the problem disappeared when the monitor warms up, I used freeze spray to cool the suspect capacitors. when capacitor capacitor C220 see image was cooled the problem returned and as it rewarmed the problem once again disappeared.
Thanks for the input guys.Attached FilesComment
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Re: IBM 6736-hc9 bad DVI input
Replaced the 2-470uf caps and all is good nowComment
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So, I have a really bizarre issue that I'm struggling to identify the cause of. Working on an 820-02020 board with some bizarre keyboard/input-source character mapping. My suspicion is a possible damaged SPI ROM (U1970), perhaps, but I'm really not sure in this case:
1. The issue is pretty weird, but when installing MacOS, I noticed my WiFi password did not work. I quickly realized the special characters (!@#$%^& etc) were not mapping correctly.
2. I noticed the keyboard layout/input-source is defaulting to JAPANESE every single time I restore the board. I am not... -
Hello,
I've repaired a few laptops in my life but this time my own laptop died😂.
Funny enough this one is a bit tough on me.
It doesn't turn on (most of the time).
Model: Lenovo y520-15ikbm (NM-391).
The only way to make it turn on is:
1) unplug battery + charger + rtc (seems irrelevant)
2) wait a minute
3) plug battery/charger in
4) on charger plugin, laptop turns on by itself. On battery plugin you have to press power button. Sometimes nothing happens and you have to try again.
5) when it turns on it also displays POST... -
This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.
Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today.... -
Hello, Badcaps is my last resort. I am the first owner of the monitor. I reached almost every repair store in my area, but no one even wanted to hear about troubleshooting an old CRT monitor. At this point, I have been trying to figure it out by myself, but I have no idea where to start or look for.
I wish to know how to think and locate a failing component. I will put all my efforts to learn and contribute.
- It started with a bright and greenish picture upon starting a cold monitor.
- About 2 years ago, only on the cold boot, the screen started to occasionally flash with
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Ok so this doing my head in and hopefully someone more knowledgeable will be able to assist.
I've got a MacBook Pro 820-2915-A it will power on without the battery connected, but when the battery is connected it will do a 2,3-second fan spin when pressing the power button and then nothing.
After measuring and probing around I found that R7051 was bad, reading high instead of 2.2Ω so I replaced it. Still the same issue, I have the green light on the charger but it won't power on or charge the battery.
So to cut the long story short I've replaced U7000,...
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