Re: Samsung LN40D550K1FXZA Backlight Problem
Thanks so much for the link to your other thread neilc6! I replaced ICP801 and the TV is back to life. Thanks everyone for your help and suggestions.
classicmac
Member
Last Activity: 01-26-2022, 01:48 AM
Joined: 08-05-2013
Location: Honolulu, HI
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Re: Samsung LN40D550K1FXZA Backlight Problem
Does anyone have any ideas on how to isolate the problem to a component or board? Should I try replacing ICP801 as suggested in the other thread?Leave a comment:
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Re: Samsung LN40D550K1FXZA Backlight Problem
I just did another test. When I plug the television in I see pin 9 briefly jump to .4VDC before dropping to 0.Leave a comment:
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Re: Samsung LN40D550K1FXZA Backlight Problem
I am getting 11.83VDC on pin 12 and 0VDC on pin 9.Leave a comment:
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Re: Samsung LN40D550K1FXZA Backlight Problem
I removed the fuse and powered the television on and the voltage is still at 160V. It is steady at that voltage. Anything else I should check?Leave a comment:
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Re: Samsung LN40D550K1FXZA Backlight Problem
Thanks everyone for your suggestions. I measured voltage at the capacitors again and it doesn't look like it goes over 360-380v. Is that an acceptable voltage? They only reach that voltage for a split second then the voltage drops down again.
I'm attaching a picture of the inverter board. Any suggestions on what to check next?...Leave a comment:
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Re: Samsung LN40D550K1FXZA Backlight Problem
I'm a little new to this. Is there something specific I should test on the inverter board?...Leave a comment:
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Re: Samsung LN40D550K1FXZA Backlight Problem
I removed CI818 and tested it and was getting ~.47-.5. It should be a .47uf capacitor right? I'm attaching a picture for reference....Leave a comment:
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Re: Samsung LN40D550K1FXZA Backlight Problem
I did more testing and the voltage across the capacitors does jump to ~400 for a split second before dropping down to ~160. Is there anything else I should verify?Leave a comment:
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Re: Samsung LN40D550K1FXZA Backlight Problem
Thanks for the link to the other thread neilc6. Are the capacitors I highlighted in the attached photo the "main filter caps?" I'm getting 163V across them. The other thread seems to say that I should be seeing 380-400V.
Neilc6 I see you had a similar problem and replacing ICP801 fixed it. Is there anything I can do to verify ICP801 has failed before I order a replacement? Thank you everyone for your responses and suggestions....Leave a comment:
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Samsung LN40D550K1FXZA Backlight Problem
I'm having trouble with a Samsung LN40D550K1FXZA where the backlight does not function properly. When I turn the television on the backlight flickers on momentarily and I can see the Samsung logo for half a second. The backlight then turns off.
The main board does seem to fully boot. I can hear sound when the television is on. I can also see picture doing the flashlight test.
I tried disconnected the main board to test the backlight as suggested in the troubleshooting manual attached to post [url]https://www.badcaps.net/forum/showthread.php?p=792496[/url]. I get the same...Last edited by classicmac; 04-30-2018, 01:49 AM. -
Re: Reliable manageble poe switch
Just a reminder to make sure that the 3560G you purchase is a POE model. Not all 3560 series switches are PoE.Leave a comment:
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