Samsung PS-42D4S plasma. Has sound, no picture. Please help!

[scokljat]

FIXED!!! :-) After replacing ML 4824 I got normal Vs and other missing voltages. TV works great, picture is fine! I really love this TV.

So, it was ML4824 after all - my first suspect! Actually, if they had IP version of IC in the local shop, I would replace it 4 weeks ago even before posting here. I'm little bit worried because I used CP version of IC as it has lower temperature range than IP, but I hope it will work for next few years...

I got following voltages:

Vs = 176V
Ve = 166,2V
Vset = 165,5V
Va = 70,1V
Vsc = -70.1V

Thank you for your help!

Cheers!

S


PS. now when I'm thinking of possible causes for this faliure, I must say I started to watch some lame Bruce Willis SF movie the night before TV died. Movie is so lame that I quit watching 15 minutes after beginning and go to sleep. Next day TV was dead. So, it must be this stupid movie! Ha?

[Maklaud]

Awesome!

[ReeceyBurger123]

Ww fair play !! Very welldone to you

[protektwar]

I followed the post thread until the end and based on this thread I replaced the ML4824 IC1 and IR2109 IC30, but still no luck.

Below you can see the reading from my TV:

VA = 70V OK
Vscan = -70V OK
VS = 8,57V Wrong (175V written on board)
VE = 4,49V Wrong (165V written on board)
Vset = 3,66V Wrong (165V written on board)
VG = 15V OK
VT = 33V OK

A6V = 6.11V OK
A12V = 12.94V OK
D3.3V = 3.25V OK
D5V = 5.18V OK
D6V = 6.16V OK
D12V = 12.94V OK
STD5V = 5.1V OK

B+_PFC = 400V measured between Q8S and Q6D

Stand-by VS_ON = 0.4V OK
ON VS_ON = 0.09V Wrong
Stand-by PS_ON = 3.3V OK
ON PS_ON = 0.25V OK

ML4824 when ON
PIN 1 = 3,67V | PIN 16 = 1,9V
PIN 2 = 1,27V | PIN 15 = 2,5V
PIN 3 = 0V | PIN 14 = 7,56V
PIN 4 = 3,62V | PIN 13 = 13,46V
PIN 5 = 0V | PIN 12 = 0.9V
PIN 6 = 7.56V | PIN 11 = 0.2V
PIN 7 = 2,62V | PIN 10 = GND
PIN 8 = 2V | PIN 9 =

Based on Power Supply schematics VS_ON is coming from another board under the the main board(where the plugs are located), named LOGIC board, as you can see in the attached file(Exploded View & Part List.pdf).

Can someone help me?

[scokljat]

Originally Posted by protektwar

I followed the post thread until the end and based on this thread I replaced the ML4824 IC1 and IR2109 IC30, but still no luck.

Based on Power Supply schematics VS_ON is coming from another board under the the main board(where the plugs are located), named LOGIC board, as you can see in the attached file(Exploded View & Part List.pdf).

Can someone help me?

Did you manage to repair it?

Regards,

Suad

[nickBcap]

Hi, will I be of any help here....? I was brought this TV board because I could solder and de solder and there was bulging capacitors on the power board. Exactly the same model, Samsung Board; BN96-01217A Model Name:V3V Rev: 1.1.
So after browsing through this thread and downloading all info pics etc, trying to find out where I should place the new capacitors I thought perhaps smarter electronics repairs guys could perhaps figure out other problems concerning this TV board by showing you which capacitors I removed from the board and showing you the replacement capacitors I bought.
This began 8 years ago and I am now not sure where each of the three different (4 in total) capacitors should be soldered onto the board.
Pictures Attached

EDITED: also hoping someone can tell where to solder the capacitor replacements I bout about 6 years ago (lol) so maybe I can sell a repaired power and working power board. I will be trying to work out the correct positions on the board for the capacitors I bought.
I do not do much of this kind of repair work I am more a computer repair guy, but I am still learning little by little electronics repairs.
Thank you

[nickBcap]

I am ok with the two larger capacitors, it is the two smaller capacitor placement positions I need help with.

[R_J]

C310 = 1500µf/10v
C314 = 1500µf/10v
C104 = 100µf/35v
C33 = 1µ/50v

[nickBcap]

Thank you