SAMSUNG le32a456c2d Flickering/blinking issue


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SAMSUNG le32a456c2d Flickering/blinking issue

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mattoxx
New User

Jul 25, 2015, 7:20 PM

Post #1 of 11 (2666 views)
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SAMSUNG le32a456c2d Flickering/blinking issue	Can't Post

Hi. My samsung le32a456c2d has the flickering/blinking issue. You can see it on video I uploaded.
Power board is BN44-00214A

edit and update:
Hi guys, I just found out that flickering is related to backlight. If backlight is set low then everything is fine. The frequency(speed) of flickering goes up as I increase it.

I did some measurement on power supply on backlight set on both low and high.

low backlight: 24V = 20.7v
12v = 10.5v
high backlight: 24V = jumping between 19.5 - 20.7v
12v = jumping between 9.5 - 10.5v

https://youtu.be/CKulN4u-SBo

(This post was edited by mattoxx on Aug 7, 2015, 5:30 PM)

jts1957
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Jul 25, 2015, 8:48 PM

Post #2 of 11 (2656 views)
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Re: [mattoxx] SAMSUNG le32a456c2d Flickering/blinking issue [In reply to]	Can't Post

Which 'similar problem was solved' are you referring to? Both my crystal balls are busted.

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Location: Far, Far Away

(This post was edited by jts1957 on Jul 25, 2015, 8:49 PM)

mattoxx
New User

Jul 25, 2015, 8:58 PM

Post #3 of 11 (2651 views)
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Re: [jts1957] SAMSUNG le32a456c2d Flickering/blinking issue [In reply to]	Can't Post

Sorry my bad
https://www.youtube.com/watch?v=i-jQZ-TQdgU

(This post was edited by mattoxx on Jul 25, 2015, 8:59 PM)

jts1957
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Jul 25, 2015, 9:54 PM

Post #4 of 11 (2646 views)
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Re: [mattoxx] SAMSUNG le32a456c2d Flickering/blinking issue [In reply to]	Can't Post

Clipping the jumper effectively removes an optoisolator from the circuit.
BN44-00341B JP852
BN44-00342B JP854
BN44-00343B JP852
Haven't located a schematic, but good high resolution pictures of front & back of boards (GOOGLE: board# shop jimmy).

YOUR board is, of course is, a different board Number / different TV Set Model Number / different Vintage - the ONLY thing that IS the SAME is the Brand.
Schematic for YOUR board: http://elektrotanya.com/...4a.pdf/download.html

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Location: Far, Far Away

(This post was edited by jts1957 on Jul 25, 2015, 9:55 PM)

mattoxx
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Jul 26, 2015, 1:59 PM

Post #5 of 11 (2619 views)
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Re: SAMSUNG le32a456c2d Flickering/blinking issue [In reply to]	Can't Post

Thank you jts1957 for info.

Does someone know what may be the issue?

(This post was edited by mattoxx on Jul 26, 2015, 2:02 PM)

mattoxx
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Aug 7, 2015, 4:49 PM

Post #6 of 11 (2517 views)
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Re: [mattoxx] SAMSUNG le32a456c2d Flickering/blinking issue [In reply to]	Can't Post

any ideas? some new info added.

jts1957
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Aug 7, 2015, 7:35 PM

Post #7 of 11 (2509 views)
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Re: [mattoxx] SAMSUNG le32a456c2d Flickering/blinking issue [In reply to]	Can't Post

Is 5.3 Volt line also affected?

Try to check/change:

12 Volt = CM856
12.8 Volt = CM858
24 Volt = CM851 & CM852

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Location: Far, Far Away

(This post was edited by jts1957 on Aug 7, 2015, 7:37 PM)

mattoxx
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Aug 7, 2015, 8:03 PM

Post #8 of 11 (2504 views)
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Re: [jts1957] SAMSUNG le32a456c2d Flickering/blinking issue [In reply to]	Can't Post

5.3v line seems to be fine

jts1957
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Aug 7, 2015, 8:13 PM

Post #9 of 11 (2503 views)
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Re: [mattoxx] SAMSUNG le32a456c2d Flickering/blinking issue [In reply to]	Can't Post

Then check the caps.

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Location: Far, Far Away

mattoxx
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Aug 9, 2015, 2:50 PM

Post #10 of 11 (2480 views)
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Re: [jts1957] SAMSUNG le32a456c2d Flickering/blinking issue [In reply to]	Can't Post

caps seem to be fine, both capacity and esr.

(This post was edited by mattoxx on Aug 9, 2015, 2:51 PM)

jts1957
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Aug 9, 2015, 6:07 PM

Post #11 of 11 (2470 views)
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Re: [mattoxx] SAMSUNG le32a456c2d Flickering/blinking issue [In reply to]	Can't Post

Even with a steady load (backlights Low) 12 & 24 volt sources are down by around 14%. Do they climb closer to normal with inverter unplugged?
Although PFC voltage is not stated on schematic, is it too affected by high and low backlight settings?

-------------------------
Location: Far, Far Away

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