Sylvania LC320SS8 Power light flashes 3-5 times then back to standby

[NasTech]

I have Sylvania LC320SS8 TV as soon as i plug in the power cord the tv powers up by itself the power light would flash green about 3-5 times then back red to standby. I check the transformers on the inverter board for opens, found one was open and repaired the open connection. The Tv still powers up by itself when powers cord is plugged in the outlet. Now the power light flashes green about 83-85 times the back light would turn off then power light will continue flashing fast about 20-24 time then back red to standby. Not sure what else is bad Please Help

[Andrew F. Ali]

Re: Sylvania LC320SS8 Power light flashes 3-5 times then back to standby

Post voltage measurements you have taken.

[NasTech]

Re: Sylvania LC320SS8 Power light flashes 3-5 times then back to standby

In which section?

[NasTech]

Re: Sylvania LC320SS8 Power light flashes 3-5 times then back to standby

Sorry for taking so long to get Voltages but this what i come up with

Back Light Power Board to CN001 on mainboard


STANDBY Voltages

1. GND
2. Protect3 3.3V
3. Protect2 0V
4. Protect1 0V
5. P-ON-BL 1.5mV
6. B/L-ON 0.963mV
7. B/L-PWM 1.2V
8. GND

POWERED On Voltages

1. GND
2. Protect3 3.3V
3. Protect2 1.17V
4. Protect1 3.2V
5. P-ON-BL 3.0V
6. B/L-ON 3.4V
7. B/L-PWM 1.51V
8. GND


CN501 From B/L Board to PWR Board

Standby Voltages 164v
Powered On Voltages 158v

PWR Board to CN010 On Main Board

Standby Voltages
1. 0v
2. 0v
3. 0v
4. 3.3v
5. 0v
6. 0v
7. 0v
8. 0v
9. 0v
10. 1.5v
11. 1.5v
12. 1.5v
13. 0v
14. 1.4v
15. 0v
16. 1.5v
17.0v
18. 0v
19. 0v
20. 10v
21. 0v
22. 0v
23. 0v

PWR Board to CN010 On Main Board

Powered On Voltages

1. 0v
2. 12v
3. 12v
4. 3.3v
5. 0v
6. 5.12v
7. 5.12v
8. 9.3v
9. 0v
10. 5.3v
11. 5.3v
12. 5.3v
13. 0v
14. 3.2v
15. 0v
16. 2.9v
17.0v
18. 15.9v
19. 0v
20. 34.8v
21. 0v
22. 3.2v
23. 1.1v


PWR Board to CN014 On Main Board

Standby Voltages
1. 3.3v
2. 0v
3. 0v
4. 1.2v
5. 0v
6. 0v
7. 0v
8. 3.3v
9. 3.3v
10. 1.0v
11. 0v
12. 0v
13. 0v
14. 0v
15. 0v
16. 0v
17.0v
18. 0.8v
19. 3.3v
20. 0v
21. 0v
22. 0v
23. 0v

PWR Board to CN014 On Main Board

Powered On Voltages

1. 3.3v
2. 3.0v
3. 0v
4. 3.4v
5. 0v
6. 3.4v
7. 0v
8. 3.3v
9. 0v
10. 0v
11. 0v
12. 0v
13. 0v
14. 6.6v
15. 0v
16. 6.6v
17.0v
18. 3.2v
19. 1.7v - 2.2v Not Stable
20. 0v
21. 0v
22. 0v
23. 0v

[RRice25541]

Re: Sylvania LC320SS8 Power light flashes 3-5 times then back to standby

Hi, Not sure if this is your problem or not, but on the inverter board you have the inverter transformers on one side,, on the opposite side near the edge middle ways you will find a capacitor of 0.1uf 50v . This was the issue with the Sylvania LC320SS8 that i worked on which was doing pretty much exactly as yours is doing now..i replaced mine with a myler 0.1uf (104) temporarily to see if it solved the problem and it did,,afterwards i replaced it with the correct cap.

try and see if this cap reads high on the ESR meter if you have one, most like mine only go down to 1uf, but you should be able to get an idea of it's state regardless..mine read 47 ohm

[dick_barton]

Re: Sylvania LC320SS8 Power light flashes 3-5 times then back to standby

Have you compared the primary and secondary of each of the inverter transformers to see they are identical or close to each other.
When the backlights do come on can you see if one of the tubes are not coming on. Darker section across the screen.