I am working on a Sony KDL-46HX820 and am getting the dreaded 4 blink error. The screen comes on and everything appears fine for about 5 seconds and then it shuts down and the standby light blinks 4 times. I'm hoping the issue is with the inverter/LED board and not the panel. I've tested the voltages from the psu and all test within range. I'm wondering if there is a trick to these? a common problem on the inverter board that I can search for or a trick to bypass the failsafe?
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Re: Sony KDL-46HX820
I had a similar a issue, with a NX720 and I have found some differences between ICs, on the LED driver board.
Next to each IC there is a test point marked Fail 1,Fail 2,... Compare them and see, if you notice any difference between them. -
Re: Sony KDL-46HX820
can can you post some good clear pics. of each board and one of how they are all connected?Comment
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Re: Sony KDL-46HX820
4 blinks could be your led driver board, not too familiar with led tvs, hopefully theres an easy way to test led driver board, ok I see tibimakai has a test procedure in post #2.Last edited by nomoresonys; 01-13-2015, 04:11 PM.Comment
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Re: Sony KDL-46HX820
some manuals, maybe one is similar to yours. http://www.toms-service-manuals.com/...h=Submit+QueryComment
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Re: Sony KDL-46HX820
http://elektrotanya.com/?q=showresul...at2=schematics
Notes: just block diagrams and repair guide.Last edited by budm; 01-13-2015, 05:40 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Sony KDL-46HX820
I'm not and expert with these either, but this is how I have found the problem, by checking these test points. Course, it could have very well be the LEDs too, I guess.
I have circled the test points.Attached FilesComment
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Re: Sony KDL-46HX820
I had the similiar problem for this model, what I did was to disconnect the t-con cable from the main board, power on, then no shutdown, turn off tv, and connected the t-con cable again. This fixed it. I guess, was the t-con was too hot cause the tv go protection mode. Hope this can give you a hint.Comment
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Re: Sony KDL-46HX820
It barely allows power through it long enough to test. After messing with it this morning, I noticed that the top part of the screen goes almost black. It seems like it's probably an internal LED causing the issue. Thanks for the help, but I'm going to scrap it me thinks.Comment
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I just got this tv today and it appeared to have no backlight on. After taking off the rear cover and checking again in the dark I can see that MAYBE one quadrant is lit.. But still it's quite dim. I was going to check the LEDs with my tester, and I found LED 1 and LED 2 + pins on the wire from the inverter, but I couldn't identify a ground. Nonetheless I tried using a mounting screw on the inverter board and also the chassis as ground but regardless my tester reads 300 which is what it reads when there is no voltage draw.
I don't know how exactly to test the inverter itself. Is it...
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