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Sony KDL-48W600B - sound, no picture, has backlight   Goto page Previous  1, 2  
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rbudrick



Joined: 23 Mar 2018
Posts: 10
Location: NH

PostPosted: Mon Mar 26, 2018 9:40 pm    Post subject: Reply with quote

I'm sure this flowchart is incredibly useful, but I'm afraid about the only terms I understand on it are "VCC" and "board." And my dad was a crt TV repairman his whole life. I've failed, him heh! But I'm glad for any explanation on where I am on that chart and what to try next. Sorry I'm bad at following it.

Thanks again!

EDIT: I figured out the flowchart references some contact points on the back of the main board:
https://www.dropbox.com/s/0hmk7kduk47ew30/s-l1600.jpg

However, I guess I'd have to solder leads onto the points mentioned and then put the board back in the set, as the contact points would be otherwise inaccessible while the TV is powered on. Where it says "Check PANEL_VCC at JIG LAND on the B* Board" I think it is asking if power is present at the contact specified. Where it says "Check NG BL_ON at JIG LAND on the B* Board" I'm afraid I have no idea what that means. Also, what is this G* board it references? Also, What does NG stand for between actions on that flowchart?

THanks!
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rbudrick



Joined: 23 Mar 2018
Posts: 10
Location: NH

PostPosted: Thu Mar 29, 2018 8:27 am    Post subject: Reply with quote

Sorry for being a bit of a newb on some of the terminology. Hoping to give this thread a small bump. Thanks again!
rbudrick



Joined: 23 Mar 2018
Posts: 10
Location: NH

PostPosted: Wed Apr 04, 2018 1:00 pm    Post subject: Reply with quote

Still hoping someone might be able to answer my last few questions above.

Thanks!
JTS1957



Joined: 21 Jan 2009
Posts: 2394
Location: Far, Far Away

PostPosted: Wed Apr 04, 2018 2:14 pm    Post subject: Reply with quote

Backlight on voltage at point indicated.
G board = Not Applicable according to grid at bottom of previous image.
Flowchart specifies 'G*-Board/ LD-Board'

https://imgur.com/a/qKJcW
rbudrick



Joined: 23 Mar 2018
Posts: 10
Location: NH

PostPosted: Wed Apr 04, 2018 2:53 pm    Post subject: Reply with quote

JTS1957 wrote:
Backlight on voltage at point indicated.
G board = Not Applicable according to grid at bottom of previous image.
Flowchart specifies 'G*-Board/ LD-Board'

https://imgur.com/a/qKJcW


Thanks. BL=Backlight. I should have figured that one. However, What is the L and H at that point in the diagram for? And NG? Also, I see the backlight is on. If this just a test to see if the backlight is getting power, if I can see it is on, I take it there's not much point in testing that? I guess I'm misunderstanding what it is actually asking me to test at that point.
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JTS1957



Joined: 21 Jan 2009
Posts: 2394
Location: Far, Far Away

PostPosted: Wed Apr 04, 2018 3:31 pm    Post subject: Reply with quote

L=Low
H=High
NG=No Good
Flow chart is for 'No Picture'

Just demonstrating flow left to right:
Is Normal boot up visible?=No
Is panel 12V present at test point indicated?Yes
BL_ON=H at test point indicated?Yes
Does changing LVDS cable make all better?NG
Conclusion would be that LCD Panel(Tcon) is failed.
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