flashing backlight


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flashing backlight

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luckyc77
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Jun 14, 2015, 12:24 AM

Post #1 of 9 (1646 views)
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flashing backlight	Can't Post

vizio e420-a0 I purchased a new power board and main board from shop jimmy installed both now i get flashing backlights. what am i missing that could be causing this any help would be great thanks

jts1957
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Jun 14, 2015, 3:07 AM

Post #2 of 9 (1640 views)
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Re: [luckyc77] flashing backlight [In reply to]	Can't Post

Capitalization P-u-n-c-t-u-a-t-i-o-n TV's Original history/symptom(s)

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luckyc77
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Jun 15, 2015, 11:11 PM

Post #3 of 9 (1617 views)
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Re: [jts1957] flashing backlight [In reply to]	Can't Post

Model# E420-A0
Part#10235492022
SN# LAUKNREN4802421

Tv had no sound no image given to me from my grandmother.
I took the whole thing apart disconnected screen and had only main and power board in so i could see the backlights, when i power on the backlights come on but flicker faintly.I have replaced both boards, tried them with out the remote sensor and with out the manual power buttons on still have same problem thanks in advance

jts1957
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Jun 15, 2015, 11:55 PM

Post #4 of 9 (1614 views)
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Re: [luckyc77] flashing backlight [In reply to]	Can't Post

In Reply To

IF you do NOT have the remote sensor or manual power buttons connected, how do you turn it on/off?
http://www.shopjimmy.com/...0-strips-1-board.htm

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luckyc77
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Jun 16, 2015, 1:39 AM

Post #5 of 9 (1611 views)
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Re: [jts1957] flashing backlight [In reply to]	Can't Post

disconnected remote sensor first tried with manual buttons same result
then disconnected manual buttons and tried with remote to see if i had short in one of them same result

jts1957
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Jun 16, 2015, 2:03 AM

Post #6 of 9 (1610 views)
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Re: [luckyc77] flashing backlight [In reply to]	Can't Post

And the LEDs?

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luckyc77
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Jun 16, 2015, 2:06 AM

Post #7 of 9 (1608 views)
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Re: [jts1957] flashing backlight [In reply to]	Can't Post

the do the same thing no difference between which one is plugged in

luckyc77
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Jun 16, 2015, 2:13 AM

Post #8 of 9 (1607 views)
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Re: [luckyc77] flashing backlight [In reply to]	Can't Post

I also do not own a multi meter that is why i just bought both boards
I bought them at different times and power board first didnt see any lights
then bought main board and didnt see any lights that is what made me decide to take it all a part
that is when i observed the lights flashing.
is there a chance i just got a bad power board?

jts1957
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Jun 16, 2015, 2:47 AM

Post #9 of 9 (1602 views)
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Re: [luckyc77] flashing backlight [In reply to]	Can't Post

Assuming no actions observed with BOTH the original boards installed ...

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Tv had no sound no image given to me from my grandmother.

ANY sound or image when flickers? OSD? You DO have an active input selected and connected?

1) With the replacement Main board installed: If still flickers with either power supply installed - both are good ....
http://www.ebay.com/...-7R1-B-/271764256587
http://www.datasheetbay.com/...99/LC420DUG-JFR1.pdf

2) IF no action at all with the first PS reinstalled ... 1st supply bad in one way & 2nd supply bad in another way ... try a third

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