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Old 08-16-2020, 08:18 PM   #16
budm
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Default Re: Panasonic TH-50AS700 - Can I rely on LED tester results?

That 4th pair looks suspicious. Try leaving the LED tester on that pair for a long time and see what happen to the Vf reading.
So the strip show about 28.2V Vf, driving the LED at 30mA will give 3V LED Vf of about 2.8V (or 5.6V for 6V LED), so the LED string has either ten 3V LEDs or five 6V (Dual LED) LED's.
If you have CV/CC bench power supply that can go up to 30V Min and min current of 300mA then you do true drive current through each LED string to test, start at 100mA first.

What is the LCD panel model number a shown on the sticker on the LCD panel.
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Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809

Last edited by budm; 08-16-2020 at 08:19 PM..
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