Re: Samsung No Backlight
My DMM checks diodes with tiny current. According to the datasheet that Vf is about right at low current. But I will check again in resistance mode....
Announcement
Collapse
No announcement yet.
User Profile
Collapse
-
-
Re: Samsung No Backlight
Diodes check out good (~0.4Vf). Backlight not on when mainboard is not connected.
Just need to figure out how to get the probe on PS_ON pin. Its on the RA connector with the pin in the back row. I will post a better photo in a few.
Leave a comment:
-
Re: Samsung No Backlight
Can I measure those diodes in circuit or do I have to remove them to check?...
Leave a comment:
-
Re: Samsung No Backlight
There is only one connector going from psu to mainboard. Do I disconnect AFTER i power up? Otherwise the psu doesn't power up....
Leave a comment:
-
Re: Samsung No Backlight
Thanks Budm,
Question. Since I have audio does that mean that the PS-ON signal is there?...
Leave a comment:
-
Re: Samsung No Backlight
No 360V on filter cap. 160VDC off, ~156VDC on.
Pic of PCB bottom...
Leave a comment:
-
-
-
Re: Samsung No Backlight
Pic: Inverter board intentionally pulled out from CCFL connections....Last edited by jderimig; 08-08-2015, 05:23 PM.
Leave a comment:
-
Samsung No Backlight
Model LN32D450, Sound, no pic, picture evident with flashlight.
History. Watching TV, went to bathroom, returned with no backlight.
Turned off and on, picture returned for 5 minutes then black.
Since then on power on, no backlight, no flicker on power on nothing but audio.
Tried new inverter board off Ebay. no change.
Measured DC voltages on inverter board. VCC =12v LD (whatever that is) 12V. 5V AC going to transformer module thingy inputs.
Any suggestions on next steps for troubleshooting/measuring?
--john
No activity results to display
Show More
Leave a comment: