Riddled TV Repair Forum
Service Menu and Manual Schematics
 
   
 FAQFAQ   SearchSearch   RegisterRegister 
   Log inLog in 
Sanyo FVD48P4 - Decaying LED driver voltage, No Backlight    
Post new topic   Reply to topic    Riddled TV Repair Forum Index -> TV Repair
 
Author Message
habznation



Joined: 10 Mar 2017
Posts: 2

PostPosted: Fri Mar 10, 2017 2:21 pm    Post subject: Sanyo FVD48P4 - Decaying LED driver voltage, No Backlight Reply with quote

I have a Sanyo FVD48P4 with good audio and an LED backlight that just flashes once.


*** LED driver voltage with and without load starts at ~60v and decays to 0.***

I checked each indiviudal LED with 3.3v and found 5 open or shorted LED's.

I got 3 replacement zener diodes from a TV repairshop, and replaced 3 bad LED's. I replaced the other two bad LED's with 5mm 35000mcd LED's I had from eBay as a trial, because i had no other zeners.



The TV shop checked all capacitors and verified good capacitance.

Same issue

I have looked everywhere on the All-in-one motherboard for any type of LED inverter fuse of any type and cannot see one......I have looked hard online for a service manual for this board, with no luck.....

Any help anyone could provide be greatly appreciated......

Thank You!!
Google

PostPost subject: Advertisement

habznation



Joined: 10 Mar 2017
Posts: 2

PostPosted: Mon Mar 13, 2017 7:34 am    Post subject: Reply with quote

does anyone have any ideas
kuhurdler



Joined: 28 Dec 2006
Posts: 2834
Location: Overland Park, KS

PostPosted: Tue Mar 14, 2017 9:23 am    Post subject: Reply with quote

most of these have some kind of error detection circuit for the backlight. It sounds to me like that is being activated.
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