Re: Need to know the reference of a connector [imac logicboard]
Following schematic diagram is connected to PS. I think its return singnal and data lines from MLB to PS. Basically data line.
1. PS ON
2. SCL RC
3. ISOLATED GND
4. SDA RC
5. GND
6. BL Enable
7. BL PWM
gabik111
ORD spotter
Last Activity: 12-24-2022, 08:46 PM
Joined: 04-11-2011
Location: Chicago O'Hare
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Re: imac 21.5 middle 2014 need help
When you open it there are 4 led diodes that showing you a boot status. When its booting up you can see a sequence how diodes lighting up. If any of the diode does not light up then see which one.
IMO you experiencing a problem with backlit board.Leave a comment:
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Re: iMac A1418 21 inch 2013/2014 820-3588-A NO POWER, FIXED!
Looks like bad power supply....Leave a comment:
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Re: iMac 21,5 Late 2013 A1418 (EMC 2638) Display dead no 4th Diagnostic LED
If you using a flashlight do you see anything on the screen?
Looks like faulty backlit.
Following Apple repair manual if no #4 LED but works on external display then replace LCD panel.Leave a comment:
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Re: Help with LED brake lights
Anyone mentioned about voltage? Running car on idle supply about 12.8V-13.2V, above 1k-1.5k rpm 14.4V but with engine shut off 11.8-12.1V . If battery is bad it can be much less.
I would focus on this and measure voltages in the car just at the lamp connector.Leave a comment:
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Re: google bitches
But not windows 10. This is greatest spyware on the world ever....Leave a comment:
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Re: Levono SL400 keyboard glitch
I believe some kind of hotkey driver/software might solve the problem.
If you got stock windows drivers then install dedicated drivers from lenovo website. Especially chipset, GPU and touchpad/keyboard. It should help.Leave a comment:
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Re: locate pin 1 on the AUO chip
Looks like chip is correctly soldered.Leave a comment:
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Re: Macbook Air A1466 820-00165-A Backlight
Did you check the fuse after replacing it and restart laptop? It might be blown again. I'm fighting with the same problem in 2012 Macbook Pro.Leave a comment:
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Re: Dell studio 1558 CMOS battery connection on motherboard damaged
Get the schematic diagram and look where the CMOS battery is connected then find better points on the motherboard to solder wires.Leave a comment:
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Re: Need Help For Imac 2009 Late 27"
So it is white or black screen?
If it is white then you might have problem with HDD (basicly no system detected or bad HDD). If it is black then the problem is more advanced. T-con pcb is integrated with LCD. There is only backit module and main logic board with GPU installed.
If you will read which status LED's are lighting then it will be easier to tell where the problem is.Leave a comment:
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Re: Need Help For Imac 2009 Late 27"
If you are sure that other GPU is good looks like this is logic board issue. I do not think that LCD itself is bad.
How status LED's behave? Do you have white or black screen?
Check with external display (HDMI tv via Thunderbolt) if you got system booting.Leave a comment:
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Re: 1998 Toshiba Satellite 1605CDS/4.3 Will not stay on!
If you disconnect CMOS battery no need to find reset jumper. Looks like fixing it becoming more time consuming than money. How power adapter behave? Does it keeps voltage constantly during that on/off period? I would start with schematic and power section of laptop looking for bad caps.
Anyway win2000 might require more CPU power than win98 so this will lead that power section might be too weak. Try to boot it to win98 and see what happens.Leave a comment:
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Re: 1998 Toshiba Satellite 1605CDS/4.3 Will not stay on!
No reset jumper in RAM bay?
Well, I'm not familiar with this laptop but there should be somewhere. Underneath keyboard maybe?
I know that there is a dip switch somewhere (under keyboard I think) to clock CPU and set CPU voltages in this laptop. Maybe there is something more near this?...Leave a comment:
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Re: Power windows automatic Switch
It calls limit switch. It might need some service (I did it in my Sienna when there was an issue with automatic door) - just need some cleaning and greasing. It require to deassembly the motor housing if it is possible (some motors are assembled permanently).
Some motors have an electronic limit switch which brakes the power when motor current is higher than some programmed value (when the motor gets mechanical resistance it needs more power=current to operate then electronics sees that and shutting off motor power).Leave a comment:
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Re: Power windows automatic Switch
Depends on what car is this usually they are integrated with the board that is underneath. The board might be a part of the internal network (CAN) which contains other features in your car.
I would try to fix this or as other suggest check wires.Last edited by gabik111; 02-12-2018, 08:11 PM.Leave a comment:
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Re: 1998 Toshiba Satellite 1605CDS/4.3 Will not stay on!
I would remove all peripherials, reseat RAM, remove and reconnect CMOS battery (might be in the RAM comparnment) and try to turn it on. Obviously only with power adapter without main battery.Leave a comment:
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Re: Samsung PS51D8000 plasma - no power at all
I know it might sound like a dumb question but are you sure you got right power in the wall outlet? If so you have to use miltimeter to test it, check fuse or voltage goes to the board. It might be filter between tv socket and PS board that might be faulty. Without multimeter will be difficult to find out what is going on.
Fuse is soldered so if you want to replace it you have to desolder existing one first.Leave a comment:
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Re: Computer troubles...
Check VGA cable (if have there). I had similar problem on mine. Turned out it was bad video cable (why it did power cycle I can't explain - simply I have no idea, I know it is weird issue).Leave a comment:
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Re: help identifying cap on Dell mobo
Hello,
What I see on the ebay listing picture there is one black element (missing on yours) and two beige (damaged on yours).
Well, looks like your schematic go missing some pages, most important in this case.
Here is a link to complete schematic diagram with power supply part:
page 37 to be precise.
Left is a grounding pad so what I see on the other side:
[url]https://obrazki.elektroda.pl/4492200000_1467751515.jpg[/url]
there is a power FET PQ702 and I would look also near PL3 and PL701 coil....Leave a comment:
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