Re: Assistance with capacitor identification
Thank you!
I managed to find a site selling the cap in a qty less than 1000.
I am hoping this will fix the problem.
devnull
Member
Last Activity: 01-28-2023, 08:18 PM
Joined: 02-09-2012
Location: NY
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Assistance with capacitor identification
I need help identifying the blue striped silver capacitor in the attached image.
It is located near the power connector on a motherboard, the voltage rating for the motherboard is 19V.
The capacitor was damaged during a hard drive removal, it was bent enough to damage it as the motherboard no longer passes POST and simply power cycles on and off.
I am guessing that its 25V. Does the 100 mean 100uF? Is it aluminum electrolytic?
Thank You... -
Re: Samsung LN26B360 Flashing Backlight
I have just finished replacing all of the ballast caps as well as all of the electrolytic through hole caps and it has made no difference, I am still getting the "flashing" backlight. Does anyone have any suggestions on what I should try next?Leave a comment:
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Re: Samsung LN26B360 Flashing Backlight
Thanks for the advice. I guess my next step would be to just go through and start replacing all the through hole caps.Leave a comment:
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Re: Samsung LN26B360 Flashing Backlight
I tried resoldering all of the inverter transformer pins and no change.
I measured PIN 1 again. It stays at 1.19V the entire time the TV is on regardless of the back light. When I turn off the TV it drops to 0.04V.
I have attached a few photos of the main/logicboard. I attempted to follow PIN1 but it seems to be attached to one of the internal layers on the logicboard as there are no traces or VIAs for it.
I found a point on the logicboard called "T1.2V" perhaps this is where the 1.19V...Leave a comment:
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Re: Samsung LN26B360 Flashing Backlight
I did some searching and I found this:
[URL="http://www.datasheetcatalog.com/datasheets_pdf/K/I/A/3/KIA393F.shtml"]http://www.datasheetcatalog.com/datasheets_pdf/K/I/A/3/KIA393F.shtml[/URL]
The PINs in the schematic appear to match up to UI802 as it appears in the IPB schematic.
Are there any other tests to narrow it down to either CCFL or IPB?Re: Samsung LN26B360 Flashing Backlight
I did some searching and I found this:
[URL="http://www.datasheetcatalog.com/datasheets_pdf/K/I/A/3/KIA393F.shtml"]http://www.datasheetcatalog.com/datasheets_pdf/K/I/A/3/KIA393F.shtml[/URL]Leave a comment:
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Re: Samsung LN26B360 Flashing Backlight
I went ahead and did the CCFL test. I tested each and every bulb by itself. I still get the "2 seconds to black". Interestingly, with a single bulb it does not fully illuminate. However when all 4 bulbs are attached they all fully illuminate. Is that normal?
The lcd has 4 bulbs total, at one end of each bulb there is a small black mark. (See attached photo) Could ALL the bulbs be bad?
There is also no return wires, instead there seems to be a metal "cap" at the end of each bulb which snaps...Leave a comment:
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Re: Samsung LN26B360 Flashing Backlight
Yes it is UI802.
From what I can make out:
A393F
906Leave a comment:
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Re: Samsung LN26B360 Flashing Backlight
I have attached two photos starting at the 30 pin connector and following the #27 PIN. I followed it until it hit a small IC. I marked the 27th PIN in the first image.
The large cap voltage stays the same the whole time the TV is on. It only drops when I turn the TV off....Leave a comment:
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Re: Samsung LN26B360 Flashing Backlight
Thank you all for your fast responses.
The readings from the secondary inverter transformer windings:
Transformer 1:
S1 & S2: .979
S3 & S4: .978
(All other combinations resulted in an infinite reading)
Transformer 2:
S1 & S2: .985
S3 & S4: .986
(All other combinations resulted in an infinite reading)
I have attached a zipped pdf of the schematic for the IPB.
I can attempt to take better photos of the bottom of the board...Leave a comment:
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Samsung LN26B360 Flashing Backlight
Hello,
I was given a Samsung LN26B360 that I would like to fix. The issue is that the backlight "flashes". When the power button is pressed the TV plays its startup sound, the sound comes on and video appears. Then the backlight turns off and stays off for about 2 seconds then the backlight turns back on for about one second and turns off. The cycle continues until you turn off the TV. During the cycle you can hear sound and if you do the "flash light" method you can see the image, you can also see the image during the brief time the backlight is working....
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