Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

[gsmtim]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

I need this bin file can you give me.

[comptek]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

hi i would remove all the brown glue it willl mean un-soldering the componants its holding in
the glue becomes conductive when it gets old and brown i have had this before
the start up transistor to the right of the mains in socket

also near the main big cap you will see the brown glue 9/10 its tracking underneath there is a link wire and you will find its scorched

regards

[budm]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

Please start a new tread if it is not the exact same model as the OP.

[Half-Saint]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

Sorry for resurrecting an old thread but I got an exact model Samsung TV as the OP with very similar symptoms. The difference is, mine will show a picture for about a second then shut off completely. The same 4x red LED blinking occurs before this happens.

The caps are Capxon GL which are known to be bad but none are bulging. Should I replace them anyway?

EDIT: I assumed my TV was the same as the OP because somebody else mentioned the same model number in the thread. The TV model is actually Samsung LE32S62B. Here's the picture of the PSU:


Should I start a new thread?

[sangel30]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

i have samsung la32s81b lcd problems is i plug it and power red is blingking ang blingking and 1 hour its on and you can use lcd tv and wen you plug it its blingking again and u can wait 1 hour to open power again pls can some one help me
;

[spintop]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

Same goes for me.. Whenever i am collecting a FAULTY monitor or TV, i am hoping that CCFL are not the cause of the failure. Hope changing the capacitors will solve your problem.

Ok just to update.

One fine morning, my wife wanted to turn on the repaired TV using the remote control, when suddenly a 'POP' sound was heard. My little daughter was arguing with her that the 'POP' sound comes from the balloon that we picked up from the mall. .. But the TV still won't turn on and it goes back to the original symptom. Power LED goes 4 blinks & turn steady without any image or sound.

So i took it apart again & the resistor (0.22ohms) got burnt again. Upon further inspection, it was noticed that one of the legs of the blue ceramic capacitor (222k 1kV) next to the Big capacitor is almost broken. So i managed to find another identical capacitor. Replaced it, as well as replacing the burnt resistor (0.22ohms) did the trick..

So far so good. It is working fine now.

Something else must be causing the resistor to burn so easily. Resistors are usually vey durable especially those leaded ones which is 1W or 2W rating

[newbie1]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

Hopefully caps or transformer are the issue here, I don't want to get to the lamps if i can avoid it. Tried changing lamps on LCD monitor before, dust and fingerprints are hardest to prevent.

Same goes for me.. Whenever i am collecting a FAULTY monitor or TV, i am hoping that CCFL are not the cause of the failure. Hope changing the capacitors will solve your problem.

Ok just to update.

One fine morning, my wife wanted to turn on the repaired TV using the remote control, when suddenly a 'POP' sound was heard. My little daughter was arguing with her that the 'POP' sound comes from the balloon that we picked up from the mall. .. But the TV still won't turn on and it goes back to the original symptom. Power LED goes 4 blinks & turn steady without any image or sound.

So i took it apart again & the resistor (0.22ohms) got burnt again. Upon further inspection, it was noticed that one of the legs of the blue ceramic capacitor (222k 1kV) next to the Big capacitor is almost broken. So i managed to find another identical capacitor. Replaced it, as well as replacing the burnt resistor (0.22ohms) did the trick..

So far so good. It is working fine now.

[spintop]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

1.10k x 0.97 = 1.067
1.10k x 1.03 = 1.133

So the range would be 1.067 to 1.133. That would suggest T1, T2, T7, and T8 are out of tolerance IF the 1.10K reference is correct from lcdparts.net.

There will also be some variation depending on the accuracy of your multimeter.

If we IGNORE the lcdparts.net 1.10k and just use the readings that you have, then

1.075k x 0.97 = 1.043.

That would imply T2 is just within the 3% threshold.

Given this TV is 4 years old with the normal wear and tear, very likely the resistances of transformer can swing off the norminal values, similarly the CCFL or even the caps. This variance could likely be causing the OVP/over-current protection in inverter to kick-in shutting the driver to CCFL.

While waiting for the caps to arrive, i have re-soldered all leads on the inverter board. This seems to improve the intermittent issue, now the problem of blank screen is very much less often. But the underlying problem is still there. Hopefully caps or transformer are the issue here, I don't want to get to the lamps if i can avoid it. Tried changing lamps on LCD monitor before, dust and fingerprints are hardest to prevent.

[retiredcaps]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

T1: 1.065k, 1.066K
T2: 1.045k, 1.047k <==== outside of range ?
T3: 1.073k, 1.075k
T4: 1.067k, 1.071k
T5: 1.070k, 1.073k
T6: 1.072k, 1.074k
T7: 1.066k, 1.066k
T8: 1.058k, 1.059k

1.10k x 0.97 = 1.067
1.10k x 1.03 = 1.133

So the range would be 1.067 to 1.133. That would suggest T1, T2, T7, and T8 are out of tolerance IF the 1.10K reference is correct from lcdparts.net.

There will also be some variation depending on the accuracy of your multimeter.

If we IGNORE the lcdparts.net 1.10k and just use the readings that you have, then

1.075k x 0.97 = 1.043.

That would imply T2 is just within the 3% threshold.

[PlainBill]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

Hi Bill
Setting DMM to lower range, I got 0.15v instead of 0 for both ENA & BL_ON.

That would indicate it is a problem with the main board. BL_ON is usually about 3 volts when the backlights are on.

PlainBill

[spintop]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

Whoops, I wasn't paying attention earlier. I wouldn't replace a transformer yet; I'd wait until proper caps were installed. However, these reading are interesting;

I'd have to look at the circuitry, but Vdd dropping to 0 volts is NOT normal. I'd trace the source of ENA and Vdd. BL_ON seems a little low compared to other inverters.

PlainBill

Hi Bill
Setting DMM to lower range, I got 0.15v instead of 0 for both ENA & BL_ON.

[spintop]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

The 2.07K reading is a bit outside of PlainBill's 3% threshold. See

https://www.badcaps.net/forum/showpo...7&postcount=18

I'll leave it to him to comment.

I did notice that lcdparts.net lists the secondary resistance as 1.10K at

http://lcdparts.net/TransformerDetai...ProductID=3497

Thanks for the link. I found I measured wrong pins.
Here are the measurement of secondary disconnected from CCFL.

T1: 1.065k, 1.066K
T2: 1.045k, 1.047k <==== outside of range ?
T3: 1.073k, 1.075k
T4: 1.067k, 1.071k
T5: 1.070k, 1.073k
T6: 1.072k, 1.074k
T7: 1.066k, 1.066k
T8: 1.058k, 1.059k

[PlainBill]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

Whoops, I wasn't paying attention earlier. I wouldn't replace a transformer yet; I'd wait until proper caps were installed. However, these reading are interesting;

The inverter board has these major parts
- OZ964GN (Blank screen ENA-0v; VDD-0v ; Normal image: ENA- 4.6V, VDD-5.1v)
- BA10324AF

I'd have to look at the circuitry, but Vdd dropping to 0 volts is NOT normal. I'd trace the source of ENA and Vdd. BL_ON seems a little low compared to other inverters.

PlainBill

[retiredcaps]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

- 4018L (transformer) (the secondary resistance 2.17K on all, except 1 is at 2.07K)

The 2.07K reading is a bit outside of PlainBill's 3% threshold. See

https://www.badcaps.net/forum/showpo...7&postcount=18

I'll leave it to him to comment.

I did notice that lcdparts.net lists the secondary resistance as 1.10K at

http://lcdparts.net/TransformerDetai...ProductID=3497

[PlainBill]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

Hi Bill
I have not replaced any caps on the inverter board. Initially i thought changing the caps on the psu fix the problem, until this intermittent issue happened

I have ordered caps (Panasonic FM/FC) online last week, but it will take a while to ship to Asia. So all caps that i replaced are generic, hopefully once replace them with Panasonic will solved the issue.

Further investigation today:
Whether blank screen or normal image screen, all the signal on the connector CNM802 coming from the PSU are similar. There is stable
- 24V (Pin1-5),
- Gnd (Pin6-10),
- 1.8v (Pin12, BL ON/OFF),
- 0.8V (Pin13, Analog Dimming),
- 4.2V (Pin14, PWM Dimming)
I can conclude that PSU has no issue.

The inverter board has these major parts
- OZ964GN (Blank screen ENA-0v; VDD-0v ; Normal image: ENA- 4.6V, VDD-5.1v)
- BA10324AF
- 4614
- 4018L (transformer) (the secondary resistance 2.17K on all, except 1 is at 2.07K)

Please advice if this transformer could be causing the slow turn ON of the backlight, and eventually blank screen after i manually switching it on/off a few times. But after it cools down for 30 min it work OK.
My next step is to change the 4x270uf 35V caps on the inverter.

Can't find schematic for the inverter board (CMO I315b1-16a), anyone have it ?

We've had a few cases where someone recapped a monitor using general purpose (NOT low ESR) caps and the monitor displayed 'two seconds to black'. Replacing the GP caps with low ESR solved the problem. Your results may vary.

PlainBill

[spintop]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

First obvious question: Did you replace the electrolytic caps on the inverter?

Second obvious question: What caps (brand and series) did you use on the power supply?

PlainBill

Hi Bill
I have not replaced any caps on the inverter board. Initially i thought changing the caps on the psu fix the problem, until this intermittent issue happened

I have ordered caps (Panasonic FM/FC) online last week, but it will take a while to ship to Asia. So all caps that i replaced are generic, hopefully once replace them with Panasonic will solved the issue.

Further investigation today:
Whether blank screen or normal image screen, all the signal on the connector CNM802 coming from the PSU are similar. There is stable
- 24V (Pin1-5),
- Gnd (Pin6-10),
- 1.8v (Pin12, BL ON/OFF),
- 0.8V (Pin13, Analog Dimming),
- 4.2V (Pin14, PWM Dimming)
I can conclude that PSU has no issue.

The inverter board has these major parts
- OZ964GN (Blank screen ENA-0v; VDD-0v ; Normal image: ENA- 4.6V, VDD-5.1v)
- BA10324AF
- 4614
- 4018L (transformer) (the secondary resistance 2.17K on all, except 1 is at 2.07K)

Please advice if this transformer could be causing the slow turn ON of the backlight, and eventually blank screen after i manually switching it on/off a few times. But after it cools down for 30 min it work OK.
My next step is to change the 4x270uf 35V caps on the inverter.

Can't find schematic for the inverter board (CMO I315b1-16a), anyone have it ?

[cadillacman]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

.. SUCCESS!!

The faulty component is indeed the resistor RM801 (to the left of the Big cap). The guy at the local store confirmed that it is likely a 1W resistor but they ran out of it. So i bought a 2W 0.22ohms resistor, replaced it & IT FIRED UP!!..

So the family's first CRT TV, which is 8 years old by the way, is going up to the recycling fella's big truck, making its way to another third world country. .. thanks again guys..

May i add that there's aint no stopping this repair "addiction".
I am opening another thread that will need your expertise. Stay Tuned.

ADDITION : The 4 blinks then steady Red Power LED is NOT an error code. It did the same thing every time i turned it on. So my guess is, it is a normal start-up procedure.

SWEET!!!!! Good find and fix!!!

[PlainBill]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

I have the same 32" LCD TV LA32S81B.
Initial problem cannot power up, I replaced all caps on the psu board and it worked (4 blinks on LED the image will display) successfully since last week.

Last 2 days, notice a problem - after power ON with 4 blinks LED (this is normal operation), the TV takes a while (20 sec) to have image display, and everything is normal.

Today, it has stop displaying the image, complete blank, but there is normal TV sound. I leave the tv with main power off for 30 mins, and turn on, i can get image after about 20 secs. Stranger intermittent problem

Hopefully someone with similar issues can advice.
Will post some pictures later.

First obvious question: Did you replace the electrolytic caps on the inverter?

Second obvious question: What caps (brand and series) did you use on the power supply?

PlainBill

[spintop]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

.. SUCCESS!!

The faulty component is indeed the resistor RM801 (to the left of the Big cap). The guy at the local store confirmed that it is likely a 1W resistor but they ran out of it. So i bought a 2W 0.22ohms resistor, replaced it & IT FIRED UP!!..

So the family's first CRT TV, which is 8 years old by the way, is going up to the recycling fella's big truck, making its way to another third world country. .. thanks again guys..

May i add that there's aint no stopping this repair "addiction".
I am opening another thread that will need your expertise. Stay Tuned.

ADDITION : The 4 blinks then steady Red Power LED is NOT an error code. It did the same thing every time i turned it on. So my guess is, it is a normal start-up procedure.

I have the same 32" LCD TV LA32S81B.
Initial problem cannot power up, I replaced all caps on the psu board and it worked (4 blinks on LED the image will display) successfully since last week.

Last 2 days, notice a problem - after power ON with 4 blinks LED (this is normal operation), the TV takes a while (20 sec) to have image display, and everything is normal.

Today, it has stop displaying the image, complete blank, but there is normal TV sound. I leave the tv with main power off for 30 mins, and turn on, i can get image after about 20 secs. Stranger intermittent problem

Hopefully someone with similar issues can advice.
Will post some pictures later.

[newbie1]

Re: Samsung 32" TV. No image, backlight or Sound. Power LED Blinks 4 times.

.. SUCCESS!!

The faulty component is indeed the resistor RM801 (to the left of the Big cap). The guy at the local store confirmed that it is likely a 1W resistor but they ran out of it. So i bought a 2W 0.22ohms resistor, replaced it & IT FIRED UP!!..

So the family's first CRT TV, which is 8 years old by the way, is going up to the recycling fella's big truck, making its way to another third world country. .. thanks again guys..

May i add that there's aint no stopping this repair "addiction".
I am opening another thread that will need your expertise. Stay Tuned.

ADDITION : The 4 blinks then steady Red Power LED is NOT an error code. It did the same thing every time i turned it on. So my guess is, it is a normal start-up procedure.