It's a Sharp LC-60TQ15U shut down and is completely dead
I tried a lot - measured the power board with a multimeter, bought a new power board (KB116WJQZ), measured power supply, baked the motherboard in the oven - nothing, no standby light, no power.
I'm not quite ready yet to give up on the TV, so does anyone have any idea what to try next?
Thanks
10 件のコメント
@joejonson give us more information about this "and is completely dead". Are you saying that there are no signs of life? No power LED etc.? You said you have a new power board and "measured power supply". Where did you measure and what were the results? Do you get power to the center unit and did you check your AC cable? Your new power board is a RUNTKB116WJQZ what are the outputs on connector PD?
oldturkey03 さんによる
@joejonson,
What voltages are on PD-13 (AC Det) & PD- 24 (STB) of the power board?
Do you get the same voltages (if any) on the same pins of the PD connector on the mainboard?
jayeff さんによる
@oldturkey03 sorry for the late response: Yes, no signs of life, I have 120V on the power cable pins, fuse is intact, but pressing of any buttons etc. does not light up LED etc. I saw in a video that if you unplug the main board (PD connector) the LEDs should be on, tried it nothing.
And yes, the part numbers and models of the power board are the same - don't think I overlooked something there.
@jayeff
I don't know if did anything wrong measuring the PD connectors but I didn't get any voltage there - had my multimeter on 20V DC put black on the housing of the TV and the red on on the pins and didn't get anything?! Was that correct?
[image|2772687][image|2772686]
JoeJonson さんによる
@joejonson
I was just looking at the info printed on the board next to the PD connector.
You can only access the odd numbered pins easily on the top of the board so pin 24 is hard to get to unless you unplug the cable, or remove the board from the chassis and support it whilst measuring the even pins on the underside
With most other brands the STB voltage is the standby voltage sent to the mainboard to indicate that power is available (the mainboard turns on the standby power LED)
There also being an AC Det pin (AC Detect?) might do the same thing. Either way there should be some voltage from the power board to the mainboard when the power is connected to the mainboard. The power board doesn't control the TV the mainboard does.
You may have to take a step back and ensure that there's AC power through the fuse on the power board
jayeff さんによる
@jayeff Hi Jayeff, you reply fast :D - unfortunately there is no labeling of the pins on that board except of PNL12V, SGND, BU5V - the underside is also not labeled - so should I unscrew the board, take the connectors out and measure the Voltage between the two rows of connector pins with 20 VDC?
Thanks
JoeJonson さんによる
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