Samsung PS43F4500 - Identify Component

[dick_barton]

I would very much appreciate your help in obtaining the service manual for this model.

There is a fault on the combined Y(Buffer/Main) board with a R5080 burning up and its solder pads overheating and starting to carbonise the circuit board. I cannot read the resistor's original value.

Even if I replace R5080 the chances are that there is likely to be other problems causing it to overheat which will need to be found and so a diagram would be extremely useful.

Vscan = 80 ohms to ground so suspect there is an issue here.

Many thanks in advance.

[ReeceyBurger123]

Re: Samsung PS43F4500 - Identify Component

Close up of the resistor bud ? Cant seem to find the Dia for this board.

[dick_barton]

Re: Samsung PS43F4500 - Identify Component

Here it is, the heat has faded the colour banding.

[ReeceyBurger123]

Re: Samsung PS43F4500 - Identify Component

Does it go into the adjustment pot ? Cant find a thing for this board ?

[dick_barton]

Re: Samsung PS43F4500 - Identify Component

Hello ReeceyBurger123,
One end of the resistor connects to the ground plane and the other end to one pin of the transformer alongside.

[Hamie]

Re: Samsung PS43F4500 - Identify Component

I've got one of these boards. Give me a minute.

[Hamie]

Re: Samsung PS43F4500 - Identify Component

Red, black, yellow, gold.

[dick_barton]

Re: Samsung PS43F4500 - Identify Component

Hello Hamie,
That's brilliant. Thanks very much for your help which is very much appreciated.

[dick_barton]

Re: Samsung PS43F4500 - Identify Component

Hello Hamie,
Out of curiosity would you be able to measure the resistance between Vscan to ground so I can compare my reading.
Thanks

[Hamie]

Re: Samsung PS43F4500 - Identify Component

Looks like it charging a cap. Goes to around 20m ohms then OL then starts to fall.

[dick_barton]

Re: Samsung PS43F4500 - Identify Component

Just checking the resistance and it's back up to a few K's of ohms so looks OK.
Powering back up the set and the area under the resistor is still arching over even though I had scraped away as much carbon as possible without losing the pads.
Have found a cheap replacement board and have ordered it.

[budm]

Re: Samsung PS43F4500 - Identify Component

One end of that resistor is not connected the + leg of the caps?

[Hamie]

Re: Samsung PS43F4500 - Identify Component

Sorry I misread that earlier, thought you'd asked for vs to ground.

[ReeceyBurger123]

Re: Samsung PS43F4500 - Identify Component

You should check things like the transistors and driver Ic of that tranny for short circuits just to be safe.

[dick_barton]

Re: Samsung PS43F4500 - Identify Component

Red, black, yellow, gold.

Just a quick suggestion. Looking at the ends of the resistor, one leg is becoming quite tarnished and it would be worth cleaning and soldering the top solder pads so it doesn't burn through as it has on my board.

[ReeceyBurger123]

Re: Samsung PS43F4500 - Identify Component

Yes solder the top pads, I had to do so on a burnt sammy sustain board as well,helps the solder flow through better. Will post image db.

[ReeceyBurger123]

Re: Samsung PS43F4500 - Identify Component

Before soldering on a Q96 Ysus board I did ages ago:

[ReeceyBurger123]

Re: Samsung PS43F4500 - Identify Component

After, looks loads better good solder joint as well. Might be best to do Db:

[dick_barton]

Re: Samsung PS43F4500 - Identify Component

Would anyone have the schematic for the power supply in this set which is BN44-00598A Rev 1.1

I have the following voltages on CN4009.
The OUT-A voltage of 79V was given in another thread on this site for this set, however it measures only 12V on this power supply.
VA & VS both start at their correct values as given on the panel label and then drop towards 0V.

Sound plays fine and set responds to remote control.

[flocko]

Re: Samsung PS43F4500 - Identify Component

Check across the three green caps for shorts and the four SMD Fets to the rear of board . If found to be shorted a new board could workout cheaper than repair ? pick them up for under £20