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Old 02-13-2020, 08:52 AM   #1
garrymc123
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Default Jvc TH-D258B No power on standby led

Jvc TH-D258B No power on standby led

Hi, Guys, I have 16v from the power board going to the audio processing board but not sure what to check after this to diagnose the problem

Any help much appreciated
Attached Images
File Type: jpg jvc 1.jpg (111.9 KB, 5 views)
File Type: jpg jvc 2.jpg (252.4 KB, 7 views)
File Type: jpg jvc 3.jpg (145.5 KB, 6 views)
File Type: jpg jvc 4.jpg (308.6 KB, 11 views)
File Type: jpg jvc 5.jpg (189.3 KB, 5 views)
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Old 02-13-2020, 06:04 PM   #2
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Default Re: Jvc TH-D258B No power on standby led

So the how many Voltage outputs are there from the power supply board, just single 16V output?
Pictures of the power supply board?
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Old 02-14-2020, 05:42 AM   #3
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Default Re: Jvc TH-D258B No power on standby led

Thanks budm for your reply yes only on output from the power supply and I have attached pictures of the power supply

Thanks
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File Type: jpg jvc 6.jpg (190.6 KB, 5 views)
File Type: jpg jvc 7.jpg (183.5 KB, 7 views)

Last edited by garrymc123; 02-14-2020 at 05:43 AM.. Reason: Forgot Pics
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Old 02-14-2020, 03:55 PM   #4
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Default Re: Jvc TH-D258B No power on standby led

Quote:
Originally Posted by garrymc123 View Post
Thanks budm for your reply yes only on output from the power supply and I have attached pictures of the power supply

Thanks
https://www.badcaps.net/forum/attach...0&d=1581605478
OK, that means the main board has the Voltage regulators, and buck converter to change the 16V to lower Voltage to run the processor.
I see at least one switching power section where the black inductor with '150' printed on top, I would check the Voltages between the two legs of those SMD Lytics caps to see if they show any Voltages.
You should also upload the pictures of the bottom side of the main board, there may be some linear regulator IC's on the bottom side too.
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Old 02-17-2020, 04:58 AM   #5
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Default Re: Jvc TH-D258B No power on standby led

Hi Budm thanks for your info I have 5v on both sides of the cap and I have uploaded a pic of the bottom of the main board

Thanks for your help
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File Type: jpg Main Board back 1.jpg (202.7 KB, 2 views)
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