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

[PlainBill]

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

Hey guys, thanks again for all the inputs.

I believe I MIGHT have found the faulty component. ..

While measuring for shorts on the diodes as suggested by Dgtech, I happen to measure very abnormal (more than 600kohms) on resistor RM801 (to the left of the Big cap). Colors marked on the resistor are Red-Red-Silver-Gold so it should be 0.22ohms 5%, isn't it?
But i need advise on the wattage of this resistor (1W, 2W, 3W)?. Anybody knows?. Also, do you need to replace it with the exact type (metal oxide film, carbon, wirewound, etc)? or just a normal one would do?

For the record, the rectangle red fuse is measure ok (i.e 0.03ohms)

Correct, red, red, silver, gold is a .22 ohm 5% resistor, typically used to sense current. As for the wattage, I would suggest going to Digikey and searching for a .22 ohm, 5% metal film or metal oxide film resistor, then start comparing dimensions to the various wattages. As a wild guess, I'd say 1 or 2 watt.

PlainBill

[newbie1]

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

Hey guys, thanks again for all the inputs.

I believe I MIGHT have found the faulty component. ..

While measuring for shorts on the diodes as suggested by Dgtech, I happen to measure very abnormal (more than 600kohms) on resistor RM801 (to the left of the Big cap). Colors marked on the resistor are Red-Red-Silver-Gold so it should be 0.22ohms 5%, isn't it?
But i need advise on the wattage of this resistor (1W, 2W, 3W)?. Anybody knows?. Also, do you need to replace it with the exact type (metal oxide film, carbon, wirewound, etc)? or just a normal one would do?

For the record, the rectangle red fuse is measure ok (i.e 0.03ohms)

[hoadle]

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

If you removed the Power board from the TV & measurement volt from CNM801
* (Pin 1) Power-On/Off = 3.4V
* (Pin 3) STBY = 5.2V
* (Pin 7 & 8) = 12V for sound
* (Pin 13 to 16) = 5.3V
* (Pin 19 & 20 & 22) = 13V
If yes you mainboard is bad follow to charpter 9 Diagram
if not you power board is bad follow to charpter 9 Diagram
But make sure check square rectangular red fuse in the middle of the board from Dgtech (maybe that fuse is blowed)

[Dgtech]

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

There is a square rectangular red fuse in the middle of the board. Was this checked as well? I dont know what it's job function is but it looks like it's separating one side from the other. After that, I'd check all the diodes. Make sure they are not reading zero ohms both directions. Then I'd look at the PWM chip. I havent located it on the board but I'd assum its the 16 pin IC chip.

[newbie1]

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

@Dgtech - yup, i have changed all the capacitors on the Power board

@hoadle - thanks for the link. Here is what i have measured

1) CNM801 (that goes to the Main Assy) (all measurement taken with respect to Gnd screw)
* (Pin 1) Power-On/Off = 3.4V
* (Pin 3) STBY = 5.2V
* (Pin 13) 5.3V = 1.0V
* (Pin 19) 13V = 0.25V

2) CNM802 (that goes to the Inverter Assy) (all measurement taken with respect to Gnd screw)
* (Pin 1) 24V = 0.55V
* (Pin 12) B/L = 1.0V..

3) ICB801S (A6159)
* (Pin 2-3) VCC = 22V (Steady) (MAX is 19V?)..
* (Pin 4-3) Threshold Voltage = 1.14V

So from my understanding (correct me please..), the Power board is the problem but am i correct to only suspect that the ICB801S (A6159) is faulty?. Or is there somewhere else that i should look?
Hope somebody can confirm this..

p/s i have now removed the Power board from the TV so if any voltage measurement must be taken i have to open the back cover TV,, again..

[hoadle]

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

Here the service manual

go section 4 Troubleshooting
Check all pins output at CNM801 (make sure pin 3 had Volt STBY(5.2V)) at section 8 Wiring Diagram page 202

[Dgtech]

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

Did you replace all of the caps or just the bloated ones? If not, then do so. I have seen that whenever some bloat, there is one or two ready to do the same. They change value in capacitance which can be checked with a cap meter.

[newbie1]

Hey guys,

After a few success in LCD MONITOR repairs, I decided to go into PAID ‘uncharted territory'.
So here goes…

Model : Samsung la32s81b.

Fault : Plugged. Pressed the Power switch on the TV. Power LED is red. Blinks 4 times. Then goes to STEADY red. No image. Backlight is OFF. No sound can be heard.

What I did : I opened the back cover and zoom-in on the Power board. I saw a SINGLE bloated capacitor (2200uF 10V) & some burn mark on the top of the board near ICB801S (A6159)…THAT'S GREAT!.. I tought. The bloated caps could be the ONLY problem. I happily ordered ALL the electrolyte capacitors (Panasonic FM/FC) on the Power board as the usual practice that I perform on my monitor repairs. Parts came, replaced them. I confidently cover the back again & plugged the Power cord. Guess what!.. STILL THE SAME FAILURE!..

I have downloaded the service manual from elektrotanya.com but could not see the error code for “Power LED Blinking 4 times”. Or maybe I do not know how to interpret it.

So now, I need to get the back cover off again to troubleshoot/measure the respective voltages/follow the trouble shooting procedure. But before I do that, I do hope to get some inputs from the knowledgeable guys here on what to lookout for. Do you think I need to replace ICB801S (A6159) too?
Or does anybody else have ever encountered the same problem? I will try to measure the VCC on the IC anyway.

I will update again once the voltage readings are done. Pictures attached (before recapped) for your viewing pleasure.