On 2019-01-09, Stu jaxon wrote:
Hi Group, I'm working a Panasonic TC-P50S2. The tv won't power up and
no led blinking codes, I found a surface mounted component that is
shorted. the board placement # ZD554 the part #VZPTZ6.2BT well I know
it's a ZENER DIODE, it's from the power supply

It has 6.2 in the part number. According to the schematic, it's across
the STBY5V supply bus. I would guess it's a 6.2 volt Zener diode.
Something like this:
https://www.rohm.com/products/diodes...tz6.2b-product

-- Adam