Tag: panasonic

Panasonic TX-55AXW634 backlight “fix” lifespan data (WHL #84F1)

Someone’s busy, so here’s a lame, lazy follow-up post to the Panasonic backlight “fix” from WHL #84:

It died. Again. Another string of LED backlight bit the dust just four months after the first one. Guess they’re all the same type, age and power-on hours at the same load, so why wouldn’t they fail left, right and center once the first LED has reached its lifespan?

Well, I had fun disabling another string on the Rohm BD9479FV backlight driver. Exactly the same procedure as shown before, and conveniently, someone already routed AGND for the PWM pin to connect to . […]

19th March 2023 19th March 2023 By Bzzz In No Comment

Panasonic TX-55AXW634 backlight (short-term) fix (WHL #84)

TVs are apparently still a thing, and so are defective ones. Here’s what I did to a 55″ Panasonic TX-55AXW634 with the red blinking light of death – likely also applicable to similar units of the “LA58 chassis” generation, e.g. the TX-48AX630B 48″ unit or the even smaller 40″ TX-40AX630E. While this fix isn’t perfect nor permanent (I heard it lasted for four months, when presumably another row of LEDs died), it’s good enough to keep the TV going for a bit longer, so one can order spare parts or decide/save up for a new unit. […]

19th February 2023 19th February 2023 By Bzzz In 1 Comment

Post #100 HP 6644A refurbishment (#P14)

Not that anybody cares, but this is actually post number 100 already. I prepared something else that failed (to be reported!), so this one has to do instead ;)

My “lab” power supply situation is ageing and often no longer up to the task, think of LEDs north of 35V or anything that takes more than one amp at voltages that cannot be provided with common computer supplies (3.3V, 5V, 12V, 19/20V) easily. So this is part one of the refresh.

I bought a HP 6644A power supply around six weeks ago off eBay, at 245€ including shipping and rack mounts via best offer. […]

23rd June 2019 20th June 2019 By Bzzz In 3 Comments