Samsung LN-T3242H power supply

[zachn]

Re: Samsung LN-T3242H power supply

I took another look at the back of the board and found a burnt resistor at RP817, removed it and it tested open. i dont have my camera with me to take a picture, however I found a schematic. I am not sure what type of resistor that is, can you help me find the correct replacement? thanks!!

[zachn]

Re: Samsung LN-T3242H power supply

I also have a bn44-00173a that i have for spare parts. If i could found out the top number value, I could pull one off the 173a board.

[PlainBill]

Re: Samsung LN-T3242H power supply

I took another look at the back of the board and found a burnt resistor at RP817, removed it and it tested open. i dont have my camera with me to take a picture, however I found a schematic. I am not sure what type of resistor that is, can you help me find the correct replacement? thanks!!

Well, it would appear to be a 6.8 ohm resistor in a 2012 package. I'm not sure what J stands for.

Because of it's location, I would also check DP814, DZP801, and QP801S.

PlainBill

[zachn]

Re: Samsung LN-T3242H power supply

So the code on top of the SMD should be 6R8?

[zachn]

Re: Samsung LN-T3242H power supply

and do you think a 4R7 would work in its place?

[PlainBill]

Re: Samsung LN-T3242H power supply

and do you think a 4R7 would work in its place?

Let me answer your question by asking another. Let's assume you are a rather well proportioned male who wears jeans with a 32" inseam, 34" waist. Would you be pleased if your wife bought you a pair of jeans with a 38" inseam, 24" waist?

Changing values in the gate drive circuit of the main power FET is a good way to blow more expensive components, such as the main power FET.

PlainBill

[zachn]

Re: Samsung LN-T3242H power supply

Im having trouble finding the correct part on mouser.

[PlainBill]

Re: Samsung LN-T3242H power supply

Im having trouble finding the correct part on mouser.

I believe they package is the metric designation. J would indicate a 5% tolerance. They appear to have them on Digikey, P6.8CECT-ND.

Did you check the other components associated with this resistor? It is very unlikely this resistor would fail unless some other component also failed.

PlainBill

[zachn]

Re: Samsung LN-T3242H power supply

nice find!
I did check the other components and QP801S was the original shorted component and that has been replaced. however I will order a new one because I used that FET from an older board I had around. DP814 and DZP801 tested OK in circuit.

[PlainBill]

Re: Samsung LN-T3242H power supply

nice find!
I did check the other components and QP801S was the original shorted component and that has been replaced. however I will order a new one because I used that FET from an older board I had around. DP814 and DZP801 tested OK in circuit.

Good work. Odds are the resistor smoked when the FET shorted.

PlainBill

[zachn]

Re: Samsung LN-T3242H power supply

The power supply appears to have four output connectors. Typically these connectors have a legend that indicates the function of each pin. You would be looking for a pin labeled something like On , Power on, On/Off, etc. The voltage at that pin would be a good start.

Of course, good pictures of the bottom of the supply would help, as would pictures of the legends.

PlainBill

Unrelated.

what should the voltage be on the on/off pin?

[PlainBill]

Re: Samsung LN-T3242H power supply

Unrelated.

what should the voltage be on the on/off pin?

0 volts for off, about 3V for On. One source suggested using 2 AA batteries to supply 3.2 volts, I'd try using a 1K resistor from 5V standby to the ON pin.

PlainBill

[zachn]

Re: Samsung LN-T3242H power supply

i got the new parts on the board, its not shorting out but it wont power on. I am just getting the red standby light and it will flash every once in a while. at the moment i am stumped.

[zachn]

Re: Samsung LN-T3242H power supply

since i was stumped, i plugged the board in and took some voltages. while i was doing that the IC at ICP801S got so hot it started smoking and almost took it self off the board. before i order the new chip, is there something else that could cause that chip to fail? thanks.

[zachn]

Re: Samsung LN-T3242H power supply

i was also getting about 60v at the points shown on the pic. does that seem high?

[PlainBill]

Re: Samsung LN-T3242H power supply

i was also getting about 60v at the points shown on the pic. does that seem high?

Not necessarily. That is in the Hot (or Live) ground area. Use the negative lead of CP803? (150uF, 450 V) as the ground point, not the chassis.

PlainBill

[eotto05]

Re: Samsung LN-T3242H power supply

Hi,
I have a samsung LN-T3242H that keeps blowing the fuse on the power supply board. the power supply board is model BN44-00192A. nothing on the board has any visible sign of damage. does anyone have an idea of where to start troubleshooting? Thanks!

I have the same model tv that I got from my sister she told me when the picture went out you would still be able to hear sound but I have yet to hear sound when I attempted to troubleshoot when I turn on the set no picture no sound I've tried hooking up cable figured it would automatically detect and maybe I'd hear sound but the red light in front of tv does come on an thats about it Im assuming ins the inverter but im unsure any suggestions?? would be greatly appreciated thanks...