SSC9522S - Current-Resonant Off-Line Switching Control IC

[Kalias]

Hi all, I have this IC located on lcd TV power supply board. I would like to know If there should be continuity between PIN8 (REG) with PIN 4 (GND)/PIN 9 (RV and PIN 10 (COM) or not??? Thanks ahead for your help.

[dick_barton]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

Looking at the circuit given in the pdf page 7, I would not be expecting continuity between the pins mentioned. Have you checked with the IC in circuit or out of circuit.

[Kalias]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

I checked it within/in the circuit. This IC gained my attention when I found a smd cap close to pin 8 which seems to be shorted/bad at first (showed continuity). After I removed it from the board, cap was ok, then I start searching around and my logic tells me that you cant have continuity through this chip on both sides of this smd cap. But I need to know for sure, If it could be ok, or not. (cause I am not good in changing these smd chips and I don't want to cause unneeded damage to the board)

[budm]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

What kind of RESISTANCE are you seeing?

[Kalias]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

Ok, let me start from the very beginning. I have TV Philips 40pfl3208h/12. It was gifted to me as a faulty with no sound or picture. I disassembled it, found one bad led. As I didnt have proper replacement led chip and it was nowhere to found, I decided to cross/bridge this led with the resistor of the resistance measured on other leds as at that time, this was the most fastest and cheapest option. After that, TV worked absolutely ok, as new, but just for few hours - on-offs. I then disassembled it again, to check backlight leds/strips/connections again, and found nothing else. During my checks I have damaged the strips, so I decided to order new ones. I ordered it from China, but instead of new came refurbished, but all leds were ok. (get full refund from the seller) Ok, I changed them, no success. Then I soldered connections between the strips to make 100% sure there in no problem with the connectors, as some were slighly burned. So, then I thought the problem is with led driver board SSL400_0D5A REV 1.0, but I later realized that I dont have 24v and 12v coming anymore from PS board. I checked all mosfets, resistors, caps, voltage regulators and many other components noted in this thread https://www.badcaps.net/forum/showthread.php?t=24536 , but nothing helped, all seems to be fine. (all tested off the board with 2 multimeters, ESR and capacitance meter..etc) Then I started to check smd components, I took some of the off the board, but every single one was ok, as per circuit diagram. The only "weird" thing which I have found was this ICSSC9522S - or better say cap C9151 (on picture attached) have continuity on both sides which doesn´t make sense to me, and continuity is with many other pins. My PS board number is 715G5246-P04-000-002S .So, now should I take it off the board and test the resistance between the pins? I dont have hot gun and definitely not the best in soldering, so If possible, I would rather measure this in the circuit. Whats your advice? Any help will be appreciated!! - also adding circuitry of very similar PS board 715G5246-P01-000-0020 in pdf, two pictures are from actual board showing IC from both sides.

[dick_barton]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

I would remove the IC and test again. Also test Q9101, Q9102, the diodes and zeners connected to that IC along with the resistors around those two mosfets. Also check R9141

[Kalias]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

Ok, diodes and zener diodes are ok, tested them off the board. I will have to take the IC out and then I let you know the resistance. I measured those two mosfets on the board, do they have to be taken also off board? There are quite a lot of smd resistors around those mosfets, so I leave them for now and focus on the first items. All I know that this will not be an easy fix. Thanks for now, let you know more after testing.

[budm]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

You keep using the word 'Continuity', you better tell use what the RESISTANCE readings are instead.
I will not remove the IC at this point yet.
How about good clear pictures of the whole back side of the TV showing all the boards, and the straight shot whole pictures of YOUR power supply/LED driver board top side and the bottom side?

"but I later realized that I dont have 24v and 12v coming anymore from PS board"
1) So did you verify that you have PS-ON to turn on the switched 12V/24V which you did not mention in your thread?
2) Did you verify that the IC has VCC1 or not?
3) Did you verify that you have Vsen or not?
4) Did you verify that the fusible resistor R9141 (0.1R) is OK or not?
5) Did you verify that you have B1+ which is the PFC Boosted Voltage that 12V/24V power supply requires that boosted Volatage to run or not?
6) Etc.

[Kalias]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

Too late, I took the IC off board (hopefully I ll be able to put it back). Continuity is still between PIN8 to PIN4 and PIN9, not to PIN 10 anymore. Resistance is pin8-pin4 = 2,1ohm , pin8-pin9 = 2,9 ohm, pin8-pin10 - OL . If I verified PS-ON, I clicked on-off button few times to check if any voltages appears, but its dead 0, and it should be 2,7-3,3 approx in standby, I only have stable 5v. Ok, by those resistances, is IC ok? The other thing, Q9101, Q9102 were tested in the circuit, must they be taken off?? Plus I found another strange thing, have two components W2A 35 on board Q9106 and Q9305, I found some spec sheet and did diode testing between base and emitter. One is ok, the other seems "open-continuity" from both sides. Can you please check that spec sheet If that is the correct component. Thanks!

1) as mentioned, put ps on several times, that wasnt the problem
2) no as there was no voltage at all
3) no
4) I was stupid, I agree, both R9141 and R9329 are bad!!! - my huge fault, I swear these were last two I didnt take out the board to test as they are 0,1 ohm
5) yes, but I am not an expert to say If I have done that correctly

Ok now we have two bad resistors, I need to know If that IC is ok based on those resistances and what to do about those two transistors?

[dick_barton]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

The IC is damaged and should not have such low resistances between the pins indicated in your post.

[Kalias]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

OK, I will order new IC and change those resistors.
1) Could you also advise on those transistors, If I have identified them correctly and should not have (bad one) "diode continuity" between base and emitter
2) is ok to test those two mosfets Q9101/Q9102 on the board?

[Kalias]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

Hi, I ordered IC, changed 1ohm resistor, problem is with 0,1ohm 1W - they dont have those.
1. Can I change them with 0,1ohm 2w, or better to replace them with normal 0,1ohm resistors?
2. Did I identify W2A 35 transistors correctly? - I need to know correct name/type of them - please review attached spec sheet and let me know.

[dick_barton]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

Hi, I ordered IC, changed 1ohm resistor, problem is with 0,1ohm 1W - they dont have those.

I'm not sure what you are saying.
It is best to replace the resistors with the exact type and also the IC (which you said you have already ordered) so that further damage occurs.

Have you checked the two mosfets Q9101 & Q9102 are not short circuit?

[Kalias]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

Yes, I checked both mosfets on the board. They are ok. They dont have the same type of resistors anywhere, so thats why I was asking what is better replacement for 0,1ohm 1W, if its 0,1ohm 2w, or normal 0,1ohm resistor?? Can you please answer my second question too? (transistors identification)

[dick_barton]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

The transistors appear to be compatible. What else is written on the resistor.

[Kalias]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

Resistor marking - 0,1 Ω, W1J, FU35L

[dick_barton]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

Use a 0.1 ohm 1 watt fuseable as a replacement.

[Kalias]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

Use a 0.1 ohm 1 watt fuseable as a replacement.

That was clear from the very beginning, but as I said, they dont have those in 4 diff. shops and cannot order them, as the lowest value possible to order is 0,1ohm 2w. That is why I was asking If I should replace them with those or regular resistors. ?

[budm]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

It is the question about safety, 2W resistor may not go open circuit when circuit has overload condition and if it is not flame proof then it can catch on fire, so it is up to you to decide.

[Kalias]

Re: SSC9522S - Current-Resonant Off-Line Switching Control IC

So is better to go with standard 0,1ohm resistor?