samsung 32 ln32b360c5d no power no indicator

[mootink]

hi i have samsung 32 ln32b360c5d that i bought off craigslist hoping it was bad caps. that was not the case all of the caps look good and all the fuzes are good. i tested the power boards output pins and all tested 0 dc v except three pin4 (e-pwm) pin6 (13v (m)) and pin7 (13v (m)) tested 5 m volts. thank you in advance for all your help.

[mootink]

Re: samsung 32 ln32b360c5d no power no indicator

i retested the power board thinking i should use the ground pin as a ground and when i did that there was 0 v on evey pin. i also tested the three big diodes and they are good.
Can you test a zener diode with a dmm diode test because i am trying to test all of the diodes and one zener diode reads .361v and .193v
The model of the power board in hv32hd_9ss bn44-00289B

[awyatt2]

Re: samsung 32 ln32b360c5d no power no indicator

check the startup cap in the power supply, it will usually be a smaller cap 10 to 47 uf somewhere close to the main filter cap(big ones)

[budm]

Re: samsung 32 ln32b360c5d no power no indicator

Please upload the pictures of all the boards so we can see how they are connected, then good clear pictures of the power supply board both top and bottom.

[mootink]

Re: samsung 32 ln32b360c5d no power no indicator

here is the pics and power board schematic

[budm]

Re: samsung 32 ln32b360c5d no power no indicator

What DC voltage do you have at the main DC filter CP815, 100uF 500VDC.
This TV has PFC circuits, when the TV is off, you should have about 170Vdc on CP815, when the TV is on, you should have about 400Vdc on CP815.
The standby power supply (always on) is generated by IC UM801S (ICE3BR0665), produces 5V and 13V standby voltages.

[mootink]

Re: samsung 32 ln32b360c5d no power no indicator

cp815 reads 162.3 vdc

[mootink]

Re: samsung 32 ln32b360c5d no power no indicator

zd804 reads 1430ohm and 4670ohm is that bad

[awyatt2]

Re: samsung 32 ln32b360c5d no power no indicator

what is the voltage on the cp815 when you turn on the set? if it does not rise the smps is not starting

[mootink]

Re: samsung 32 ln32b360c5d no power no indicator

the set does not turn on and cp815 reads 162.3 vdc

[mootink]

Re: samsung 32 ln32b360c5d no power no indicator

how do you test a zenner diode.

[budm]

Re: samsung 32 ln32b360c5d no power no indicator

Since you have the diagram, do you get the 5V and the 13v standby voltage as I mention in post6?
' i tested the power boards output pins and all tested 0 dc v except three pin4 (e-pwm) pin6 (13v (m)) and pin7 (13v (m)) tested 5 m volts" What is the 5m volts, 5 millivolt (mV), or 5 Volts? same for the 13V.

[mootink]

Re: samsung 32 ln32b360c5d no power no indicator

no there is no voltage at any of the pins

[budm]

Re: samsung 32 ln32b360c5d no power no indicator

So the 5V power supply is dead. Your TV looks almost th same as one I am working now with bad screen, I will see if it has the same power supply/inverter combo board.

[budm]

Re: samsung 32 ln32b360c5d no power no indicator

See here: https://www.badcaps.net/forum/showth...202#post255202
It may give you some ideas what you should have.

Or here:
http://s807.photobucket.com/albums/y...20LN32B540P8D/

[mootink]

Re: samsung 32 ln32b360c5d no power no indicator

I think i found three shorted diodes. (zd804, dm852, zm804) I ordered the parts and will hope that will fix it.

[mootink]

Re: samsung 32 ln32b360c5d no power no indicator

it is fix

[tom66]

Re: samsung 32 ln32b360c5d no power no indicator

Glad to hear, what voltage zeners did you use in the end?

[mootink]

Re: samsung 32 ln32b360c5d no power no indicator

the same as stock specs

[tom66]

Re: samsung 32 ln32b360c5d no power no indicator

the same as stock specs

Which were what voltage rating?