Samsung UE32EH4003 no picture

[Norman1]

Hi guys, got a faint picture on this Samsung, got 180v on pin 1 of the backlight connector and nothing on the other 4. Should there be?

[Norman1]

Re: Samsung UE32EH4003 no picture

Power supply pic

[Andrew F. Ali]

Re: Samsung UE32EH4003 no picture

1. Disconnect the jack going to the Main Bd.
2. Turn ON tv.
3. Do the Backlights come ON now?

[dick_barton]

Re: Samsung UE32EH4003 no picture

Hello Norman, Out of interest, were you successful with any of your other repairs.

Does the board say led voltage 112V @ 260mA which would suggest that 180V is the open circuit voltage and the led strip is probably open circuit. Either a bad led(s) or bad led strip connection.

[Norman1]

Re: Samsung UE32EH4003 no picture

Hi Andrew, without the main board attached there's no picture at all, not even a dark one. Hi Dick, on the pcb it says 65v 450ma. So if the voltage is high is that suggesting the led's are open circuit not bringing the voltage down?

[Norman1]

Re: Samsung UE32EH4003 no picture

Iv repaired a fair few of them except the ones with backlight problems, I havnt attempted one yet, but I have a few here now so I will crack one open as soon as I get time and see how I get on

[CDRW]

Re: Samsung UE32EH4003 no picture

you need such a device to diagnose the backlight. Without disassembly of the display
https://ru.aliexpress.com/item/NO-di...81e3364a&tpp=1

[Andrew F. Ali]

Re: Samsung UE32EH4003 no picture

I probably didn't say it right....You WILL NOT get a picture with the cable from PSU to Main Bd disconnected....I wanted you to look for the backlights through the holes at the back of the panel.......You do however have bad backlights though from what I read......Can you strip the panel down to reveal the LED backlight strips??

[Norman1]

Re: Samsung UE32EH4003 no picture

I have that device in my armoury there is no sign of any light from the led's at the rear. When replacing led's individually can you use led's from a different make/model/size TV? Or are they different voltages ect?

[diif]

Re: Samsung UE32EH4003 no picture

I have that device in my armoury there is no sign of any light from the led's at the rear. When replacing led's individually can you use led's from a different make/model/size TV? Or are they different voltages ect?

LEDs can be a different size, colour and mounting. There are a couple of voltages too.

[Norman1]

Re: Samsung UE32EH4003 no picture

So is there a way of telling which ones out of a scrap tv will go in another tv? Are the volts marked on the pcb strip or anything?

[diif]

Re: Samsung UE32EH4003 no picture

So is there a way of telling which ones out of a scrap tv will go in another tv? Are the volts marked on the pcb strip or anything?

You could spend time cross referencing numbers on sites like ebay and shopjimmy although some look the same from the top but not the bottom.

I'd just remove the faulty LED, check my stash for the same LED then look for a new one online if I didn't have one in stock.
There are people selling replacement strips just get an identical one.

[Norman1]

Re: Samsung UE32EH4003 no picture

I have a few TVs to strip down when I get a minute, il have another look on eBay as well,the last time I looked on there for led's they were prices were way to high,