Re: VW46L FHDTV20A - backlight no image or sound
I had to use pins 2 and 4 to ground as they are the gates; thank you so much for your help! this work perfectly and restored my sons tv to working order.
Nox...
xxNoxiouSxx
Member
Last Activity: 12-16-2018, 12:37 PM
Joined: 10-03-2017
Location: Crandall
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Re: VW46L FHDTV20A - backlight no image or sound
These were the values on the mosfet pins using chassis GND. Pins 2 and 4 were 11.80V
U21
4953GM
840014
pin 1 = 12.22v
pin 2 = 11.80v
pin 3 = 12.22v
pin 4 = 11.80v
pin 5 = 004.2mv
pin 6 = 004.2mv
pin 7 = 004.2mv
pin 8 = 004.2mv...Leave a comment:
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Re: VW46L FHDTV20A - backlight no image or sound
I jumpered that mosfet and now getting 12v power to the t-con and a beautiful no signal message on screen and a menu!
Thank you for your help!
I am going to order a replacement. seems a bad mosfet at U21 is my issue.Leave a comment:
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Re: VW46L FHDTV20A - backlight no image or sound
this unfortunately is where I start to go beyond my comfort zone with components. All this stuff in the data sheet is Greek to me. (attached what I believe to be the data sheet)
When I test for continuity from the T-com fuse all 4 pins (both D1 and D2 pins) on this mosfet 5-8 beep. the pins that have 004.2mv.
I am confident enough in my soldering ability to swap this component out if its the culprit. But I don't know enough about datasheets and MOSFETS to know.
even your last statement...Last edited by xxNoxiouSxx; 10-04-2017, 02:27 PM.Leave a comment:
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Re: VW46L FHDTV20A - backlight no image or sound
so I am assuming that is U21?
U21
4953GM
840014
pin 1 = 12.22v
pin 2 = 11.80v
pin 3 = 12.22v
pin 4 = 11.80v
pin 5 = 004.2mv
pin 6 = 004.2mv
pin 7 = 004.2mv
pin 8 = 004.2mv...Last edited by xxNoxiouSxx; 10-04-2017, 12:17 PM.Leave a comment:
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Re: VW46L FHDTV20A - backlight no image or sound
here are the following. hopefully i got them all, don't know if I missed any.
U2
AMC1117
F0826J
pin 1 = 2.069v
pin 2 = 3.328v
pin 3 = 4.89v
U4
AMC1117
F0826J
pin 1 = 2.063v
pin 2 = 3.317v
pin 3 = 4.97v
U7
AMC1117
F0826J
pin 1 = 2.065v
pin 2 = 3.320v
pin 3 = 4.90v
U8
AMC1117
F0826J
pin 1 = 000.6mv
pin 2 = 1.258v
pin 3 = 2.5vLeave a comment:
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Re: VW46L FHDTV20A - backlight no image or sound
I just tested the two main big ones U11 and U9
there are some others that are much smaller u2, u4, u7 and u8 those are IC's too correct? again I apologize for my ignorance here as I still have a lot to learn.
these 2 were tested with the unit powered up
U11
7805CT
RPH809 G
pin 1 = 12.22v
pin 2 = 000.2 mv
pin 3 = 5.03v
U9
1084
0845CL
pin 1 = 1.252v
pin 2 = 2.5v
pin 3 = 4.89v...Leave a comment:
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Re: VW46L FHDTV20A - backlight no image or sound
please disregard, I see the tut in your sig. reading up on it nowLast edited by xxNoxiouSxx; 10-04-2017, 09:53 AM.Leave a comment:
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VW46L FHDTV20A - backlight no image or sound
I am new member, first time posting.
[INDENT]My sons VW46L went out, I have the typical no image on screen with flashlight test etc. The backlights are working as I see the white light through the holes on the back of the tv when the power is on and vizio logo goes white.
I have been reading this thread
[URL="https://www.badcaps.net/forum/showthread.php?t=34388&highlight=VW46L"]https://www.badcaps.net/forum/showthread.php?t=34388&highlight=VW46L[/URL]
I have followed it all the way to testing F1 and F2 on the mainboard and believe...Last edited by xxNoxiouSxx; 10-04-2017, 08:41 AM. -
Re: New Members - please post your introductions here
Hello. I am former IT manager currently a software engineer... have a vizio that is my son's tv and this seems to be the place for help on these matters.Leave a comment:
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