resistor wattage help

[multimeter]

Re: resistor wattage help

This board looks familiar, please check those resistors, make sure they are not open. If I am correct, they should be 68 Ohms resistors.

yellow,blue,black,gold 46 0hm 5% ,actual reading from dmm 46 ohm check good

[Scenic]

Re: resistor wattage help

By the way, the link you provided, 4shared, it asked to pay to join/download, they are not free download?

Since the Megaupload disaster, 4shared disabled their monetization stuff and set it so you have to register to download files. No need to pay for a premium account, but it's still annoying. Before MU got busted, you were able download without registering. I'm gonna move most of the files from there to my own server soon, as the forced registering makes it kinda pointless to host files (schematics, datasheets, service manuals, ..) there..

Enough off-topic for now

[multimeter]

Re: resistor wattage help

tried bridging the 5.3v to ps-on,with a 30 ohm 5 watt (ish) resistor and measuring across them i get 5.3v ,which is now stable and not cycling,but still no other voltages coming up at other connectors on the psu,there must be more pins that need joining to fully power up the psu

[budm]

Re: resistor wattage help

When you you apply the 5v to the PS_ON, that large filter voltage should go up to around 400Vdc, if not, then the PFC circuits are not working, that will be the starting point to look for the cause of the problems.

[multimeter]

Re: resistor wattage help

When you you apply the 5v to the PS_ON, that large filter voltage should go up to around 400Vdc, if not, then the PFC circuits are not working, that will be the starting point to look for the cause of the problems.

if i remember correctly,the filter cap is at 380v wether ps-on is getting its 5v signal or not,il check again in a mo and double check

[multimeter]

Re: resistor wattage help

ok,main board disconnected i get 328v dc at the filter cap.
main board connected i get 385v dc.
ps-on jumperd with resistor to 5v, i get 385v dc ,no main board connected
seems the pfc circuit is working
on one of the optocouplers in the feedback circuit, i get cycling voltage,all the optocouplers have been tested and confirmed good,led side,and the transistor side.in a bit il write down all the connector pins with there outputs ,someone might be able to identify which pins have to be jumperd,then il be able to put light bulbs on the output pins to gnd ,and see if this thing will fire up with no main board connected which it should do!im at a bit of a loss with this one,and with no schematic dosent help at all

[budm]

Re: resistor wattage help

Yes the PFC is working, PS_ON is working (it is used to turn on the PFC and the 12/24v switching supply section), the only thing that is not working is the 12V/24V switching power supply circuits, it cycling on and off right now. I will have to do more thinking about this since we cannot find the digarm, but I am sure at this point we know which section is bad. I may ask you for more closed up pictures of the 12/24 switching power supply section so we can trace out the connection.
We may have to look at the starting cap in the 12/24V SMPS section.
We need good clear pictures of the bottom side of the board also.

[multimeter]

Re: resistor wattage help

ok,the optocoupler that is cycling is opto number 4 on your picture,the module that you highlighted has been replaced with a brand new one,these have been a high failure in other samsung psu's,also the pwm has been replaced also,and also the start up cap replaced (panasonic fm),all other caps have tested good for capacitance and esr

[budm]

Re: resistor wattage help

So what is that module, it is not the SMPS module? Which PWM IC was repalced? The one for the 12/24V power supply. I cannot tell much since I do not have the pictures of the bottom side of the board.
I expect the #1 OPTO ot be the one that is cycling since it is closed to the 12/24Vdc section, not sure what #4 is for yet.

[multimeter]

Re: resistor wattage help

the module is a F9222L ic,not exactly sure what it does,but has been a failiure in the past,the other chip i replaced was a viper12a 8 pin,just left of the small standby transformer,above the 3 resistors you pointed out earlier for testing

[budm]

Re: resistor wattage help

Oh OK, you replaced the Standby SMPS IC, Viper12A for the 5Vstby.
I believe that module is the SMPS module for the 12/24vdc switching power supply.

[multimeter]

Re: resistor wattage help

ok,connectors as follows:



connector 1,24 pin to main board:

pin1,ps-on pin13,n/c
pin2,5.2v pin14,gnd
pin3,gnd pin15,gnd
pin4,9.2v pin16,9.2v
pin5,gnd pin17,gnd
pin6,gnd pin18,gnd
pin7,5.3v pin19,5.3v
pin8,5.3v pin20,5.3v
pin9,gnd pin21,gnd
pin10,12v pin22,gnd
pin11,12v pin23,12v
pin12,n/c pin24,n/c


connector 2 5pin to main board:

pin1,det
pin2,gnd
pin3,pwm
pin4,adim
pin5,blu


connector 3 14pin to inverter board:

pin1,24v pin11,n/c
pin2,24v pin12,b/L
pin3,24v pin13,adim
pin4,24v pin14,pwm
pin5,24v
pin6,gnd
pin7,gnd
pin8,gnd
pin9,gnd
pin10,gnd

[sofTest]

Re: resistor wattage help

the tvs model number is: samsung LE23R86WD

You will find full service manual with schematics, electrical part list etc. here (four part download).

[multimeter]

Re: resistor wattage help

You will find full service manual with schematics, electrical part list etc. here (four part download).

i downloaded that manual,but it isnt the right one,many thanx tho

[multimeter]

Re: resistor wattage help

can anyone explain what the pins 1,3,4,5 do on connector number 2?

[sofTest]

Re: resistor wattage help

i downloaded that manual,but it isnt the right one,many thanx tho

Strange.

[multimeter]

Re: resistor wattage help

Strange.

twice ive downloaded that same one,but there is no schematic for this power supply,it gives the model number for my tv ,yes,but not the schematic for the power supply

[fildelo]

Re: resistor wattage help

hi,
my bn44-00158a is burning its fuse. The TV is a LE23R86WD.

RM801 (0.22R) is burnt too and CM801 (18pF) is cut (tested unsoldered).

What can I test to find the cause of the short circuit ?

Thanks

[fildelo]

Re: resistor wattage help

found a good manual to repair PSU, applicable for le23r86 lcd :
http://electrohelponline.blogspot.fr...sion_4899.html

[nickon51]

Re: resistor wattage help

Here is a link to a BN44-00155A power supply which may be close enough. http://www.eserviceinfo.com/download...44-00155A.html

RM801 is a .22ohm 1W resistor. It's in series with the main switching FETS. It sounds like the supply is cycling on and off, often caused by an overload on one or more of the rails. Disconnect each of the rails until the rails remain steady.

Good luck.