Backlight stops working on Philips 55PUS7303
Hi all, I wonder if you can help me.
I've been noticing the screen on my 2019 tv getting a bit darker on the upper and lower edges of the screen, but hardly noticeable unless on a bright equal picture, so thought its normal (tv never had uniform white either way).
Then yesterday the backlight gave up while on. A full power cycle has it turn back on for a second and it shuts itself off again. Picture and sound are working.
I opened the back panel to see if there's something looking off but it appears fine. I can do a voltage reading but I'm not sure what values I'd be looking for.
Thanks in advance!
Sorry, couldn't upload photos in a comment so adding an answer.
the first thing I would do I measure the DC voltage on the Backlight LED connectors on the power board.
Post a picture of what your screen is actually showing. It would be good to see the differences in lighting.
@oldturkey03 thanks again man! The differences in lighting are no longer visible as the entire backlight panel turns off a fraction of a second after a full power cycle where you can only see the logo centered so even if I capture it it won't show. I mentioned it as it looked potentially relevant that I noticed parts of the screen have gotten ever so slightly dimmer days before it died entirely.
Here's DC readings of the LED connection on the power board. Positives around 25V and negatives around 2V, no exceptions.
@oldturkey03 R8619 is probably under one of the heatsinks unfortunately, or I'm blind and can't see it...
I think I'll take the risk and order backlight strip replacements though. Let's see if I can disassemble a full screen, it will be a first. 😅
@oldturkey03 you are a LEGEND!
Replacement backlight arrived this week and I changed it today. I was overwhelmed with joy once the lights stayed on!
Later however it soured a bit when I saw a dark area on the screen. Now I'm not sure if it's something I've messed up in the reflector sheet or diffuser or if it's the chinese backlight strips fault. Any thoughts? The darkening is at the beginning of the strip so I don't think it's voltage related, but it looks like two of the strips are affected.