Re: finlux (vestel) 42f701 3d lcd backlight but no picture
I doubt it, since I get a distinct "beep" for each press, but I will check!
EDIT:
Nope, exactly the same with the buttons disconnected.
deeshu
Member
Last Activity: 05-15-2015, 05:25 AM
Joined: 02-19-2015
Location: Lund
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
All seems fine as far as I can tell. 12 v over main fuse, the large regulator U5 regulates 3.3v to 1.2v.
How would I go on about resetting sofrware? Sofar I have not been able to make it read update-files (this is when I noticed that it is alive enough to create files on a usb). Do i need to rename the firmware to something specific?Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
Is there anywhere I can find a diagram for the tcon board?
F1 is not busted. Will check U5 now.
EDIT:
I cannot check if I get sound output, since tv is unresponsive to buttons and remote....Last edited by deeshu; 02-21-2015, 08:26 AM.Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
U39, U18, U25 and U26 all output the correct voltages. I seem unable to find anything wrong with this tv. Could it be software-related?Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
I have measured all the incoming voltages from the psu, and they seem right. The tv makes a "BEEP" when you press one of the buttons on the side, but it is otherwise unresponsive to them.
I have also measured the 4 large voltage regulators on the MB and they all raise the input voltage by 1.25v as expected. I am not sure how to know if these input voltages are ok, though.
EDIT: found them in the diagram, will measure again soon.Last edited by deeshu; 02-21-2015, 06:05 AM.Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
The model is 17MB61-2, do you need more than that? There are some other stickers with numbers, there is a picture higher up in this thread, and two posts up from that is a full problem description. The main board is alive enougth to create files and folders on a usb drive though.Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
Ok, on to voltages:
3.3v and 5v standby are fine.
24v and 5v also.
3.3 on measures as 3.2 and 12 v on measures as 11.9. Could there be something wrong with the inverter board? I suppose that it is this thing at the top of the tv (attatched). What should i look for?
But I am not sure how this would explain that the tv in unresponsive to the remote and the buttons once it is powerd on......Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
Okay, so I haven't gotten around to taking those measurements yet, but I noticed something intresting. When connecting a USB drive to the tv a folder structure for DVR is created on the drive when starting the tv, so at least some of the intelligence in it is alive. Now onward to those measurements....Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
Yes it is, thanks for the link! Will do measurements tomorrow. Is the metal case under the board a suitable ground?Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
So, I measured 4 large voltage regulators on the mainboard, and they all raised the input voltage by 1.25v as expected. This tells me two things: they are not faulty, and the MB is at least supplied some voltage.
I would love some feedback on how to measure the psu voltages while the system is on, and on what voltages to expect!
Picture of PSU attatched.
EDIT:
I also found this:...Last edited by deeshu; 02-20-2015, 01:33 PM.Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
These are all I have for now, I can take more when I get home....Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
Hi, thanks for the reply!
No, I haven't, for a couple of reasons:
1. I didn't see any caps that looked bad on the psu (I do know what to look for, I Have repaired a couple of TV:s and screens in the past).
2. I do not know how to know which pins to test for which voltage, or how to figure it out.
3. Measuring on a live psu seems dangerous....
4. It almost works: the initial standby when you plug it in looks normal, and you can start it with the remote or a button....Leave a comment:
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Re: finlux (vestel) 42f701 3d lcd backlight but no picture
Hi! Sorry for bringing such an old thread back to life, but I have the exact same problem with my Vestel (andersson A376FDC PVR). Standby works fine, but when you start it you only get backlight and no picture, and it just beeps when you press a button on the tv. Pulling the plug is the only way to turn it off again.
The PSU in mine is a 17pw26-4, but the mainboard is verry, verry similar. Please, what did you find out?Leave a comment:
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Re: New Members - please post your introductions here
Hi there! A long time lurker finally joins.
Software engineer with a hobby of repairing stuff
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