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Panasonic TX48CX400B

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call me al:
hI all Am struggling with this Pan tx48cx400b Fault is backlights flash on for a second and go off,have checked leds all seem ok.Psu is the 17ips20 so am suspecting it but not sure Any ideas very welcome Thanks again

downunder:

Hi Al,

Don't know the 17ips20 power supply, but 90% of failures are caused by backlight LEDs.

If you used a LED tester, it can't entirely be relied on, eg, it may light up a strip with a shorted LED at the low current it operates on, whereas in normal operation in the tv at higher current, the protect will be activated. The LED tester lacks the same protect circuit and will keep the strip alight forever.

My gut feeling is backlight LEDs, but you'll have to strip the display panel to know for sure. Piece of cake and peace of mind.


Bruce

sinclairtv:
Iv exact same model and all leds are fine. I think its power supply but it looks like I need the exact psu to check it. Mine runs for 10 mins then goes out. Others online complaining of same symptoms

t1412:
hi if the voltage is low on the filter cap, if the reading is 335v the mosfet as shorted

shaun

call me al:
Hi All A big thanks for all replys especally to Bruce for being bang on with his ,it was exactly as said went back and re checked leds and found 3 shorted replaced them and on it came.My next problem was trying to get lenzs to fit properly to get red of halo effect ,have only been moderatly sucessful at this .What glue is best to use as have yet to get on that works right.Anyway thanks again be lost without this forum :93:

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