Riddled TV Repair Forum
Service Menu and Manual Schematics
 
   
 FAQFAQ   SearchSearch   RegisterRegister 
   Log inLog in 
Sylvania LC320SS8 - Power light flashes then back to standby    
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair
 
Author Message
Nastech



Joined: 08 Mar 2017
Posts: 2
Location: The Bahamas

PostPosted: Wed Mar 08, 2017 5:34 am    Post subject: Sylvania LC320SS8 - Power light flashes then back to standby Reply with quote

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 and the set has faint high pitched sound coming from the secondary power supply. Please Help
Google

PostPost subject: Advertisement

JTS1957



Joined: 21 Jan 2009
Posts: 2286
Location: Far, Far Away

PostPosted: Wed Mar 08, 2017 12:29 pm    Post subject: Reply with quote

Found: Look for Open inverter transformer and look for shorted D655 on main power supply board.
Nastech



Joined: 08 Mar 2017
Posts: 2
Location: The Bahamas

PostPosted: Thu Mar 09, 2017 6:20 am    Post subject: Sylvania LC320SS8 Power light flashes then back to standby Reply with quote

I did repair the open secondary winding in inverter transformer T1100, that repaired made the backlight stay on longer and D655 is not shorted.

These are all my voltage measurements in standby and when the Power button is press.


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
Display posts from previous:   
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair All times are GMT - 6 Hours
Page 1 of 1

 


Disclaimer: All information provided by RiddledTV is strictly for information purposes only. Please observe all warnings displayed on your electronic
devices. This information should only be used to help diagnose work, and all service should be performed by a qualified technician.
Contact Us       Privacy Policy       Copyright © 2015 RiddledTV.com       Advertise on RiddedTV.com