Samsung U32EH4003 problem.

[HellasTechn1]

Re: Samsung U32EH4003 problem.

On the chasis there is a sticker saying Samsung CY-DF320AGEV1H.

made in hungary

[dick_barton]

Re: Samsung U32EH4003 problem.

What's your LCD panel make and model number as attached to the metal chassis.

https://www.youtube.com/watch?v=EgRKJAqYqeo

[HellasTechn1]

Re: Samsung U32EH4003 problem.

Measure each Led connector pin using chassis as ground and post results please.

Can you also post a focused picture of your power supply so that the legends can be read.

I get 139.1 V from D+ (transformer's side) to chassis and 2.2mV "nothing" from D- to chassis (controller's side).

In the purple bos is the diode that connects the transformer with D+

[HellasTechn1]

Re: Samsung U32EH4003 problem.

Measure each Led connector pin using chassis as ground and post results please.

Can you also post a focused picture of your power supply so that the legends can be read.

Will do !

Did you replace the one burnt LED on the strip or did you replace the entire strip? If you had just replace the one burnt LED and not the entire strip, I would think that your replacement LED was not the correct type or the solder connections you made were not properly done. Anyway, for the source LED supply to be burning one set only does not seem logical to me.

I replaced only the burned LED. It is of same specs with the rest. As for soldering i can confirm that it's been done correctly since if i power each strip individually with 27V from my bench PSU, all LED's glow.

It was probably just some random reason that burned the same LED.
I beleace that the reason im getting such high voltage is that there is something wrong with the D- side.

[Andrew F. Ali]

Re: Samsung U32EH4003 problem.

Did you replace the one burnt LED on the strip or did you replace the entire strip? If you had just replace the one burnt LED and not the entire strip, I would think that your replacement LED was not the correct type or the solder connections you made were not properly done. Anyway, for the source LED supply to be burning one set only does not seem logical to me.

[dick_barton]

Re: Samsung U32EH4003 problem.

Measure each Led connector pin using chassis as ground and post results please.

Can you also post a focused picture of your power supply so that the legends can be read.

[HellasTechn1]

Good day people !

I came back to you with a new problem i came across.

I have a Samsung U32EH4003 LED TV that keeps blowing the bottom LED strip.

At first i locaded the burned LED and replaced it, thinking that thiss would be all. After powering it up it blew that LED again.

I disconnected the backlight pwer connector from the PSU and the mainboard power connector and then i pluged in the PSU and measured voltage across pins 1 and 5 of the CNL802 (backlight connector) and it gives me 140V DC.
There are 2 led strips consisting of 9 LED's which in series should require around 54V DC to work. Now no wonder it keeps blowing LED's but why is it giving me such high voltage ?

I have attached pictures for you.

From what i see the D+ comes from the transformet through DM805C diode
and D- from IC9205 or IC9805 (isnt clear) through Q9803C MDD4N20Y mosfet