Re: JVC JLC47BC3002 47" LCD TV Dead - No power on , no lights

I thought I would post what I ended up doing on the TV. As I originally saw on another thread here on Badcaps, the JVC JLC47BC3002 and the Vizio E471VLE are almost identical TVs (both manufactured by Amtran). The lcd panels and power supplies are common, as is the form of the main board.
I ended up returning the non-functional replacement JVC main board that I bought, and getting a Vizio E471VLE main board. When I installed the Vizio board, everything works properly. The only consequence from the Vizio board...

Re: JVC JLC47BC3002 47" LCD TV Dead - No power on , no lights

I purchased a used Main board for the TV (that stated it had been tested) and now I have:
Red light on front of TV on when plugged in. Pressing power results in the white light on the front of the set turning on, but the backlight does not turn on. Once the white light is on, pressing the power doesn't do anything. I must unplug the TV from the wall to get the white light off.

Here are the voltages measured at the 14 pin connector when the white light is on:
(all voltages were 0 with the...

Re: JVC JLC47BC3002 47" LCD TV Dead - No power on , no lights

More results:
I did not have any 1k ohm resistors, but I used two 3k ohm resistors that I had.
I connected the resistors from a 5.2V output to the "On/Off" and "Standby".
The backlight worked, and here are the voltages measured from the 14 pin connector output:
DIM = 3.33V
Status = 0V
On/Off = 4.64V
Standby= 5.21V
12V = 11.84V
12V = 11.84V
12V = 11.84V
Grnd = 0V
Grnd = 0V
Grnd = 0V
Grnd = 0V
5.2V = 5.30V...

Re: JVC JLC47BC3002 47" LCD TV Dead - No power on , no lights



I'm pretty inexperienced at this, so just to be sure I'm understanding correctly, it appears that you are calling the three 5.2V terminals "STBY voltage". So I would solder a resistor between one of the three 5.2V terminals and the "Standby" pin to turn on the PSU, and then another resistor to the "On/Off" to check the power to the backlight.
After that is done, if the PSU is working properly, the backlight would be on, and the 12V terminals should show voltag...

Re: JVC JLC47BC3002 47" LCD TV Dead - No power on , no lights

Thanks for the input so far.
Here is some more information with the cable to the main board disconnected. I still only see voltage on the bottom 3 pins (all labeled 5.2v). Today I am seeing voltage constantly varying between 5.14v to 5.23v. When I measured yesterday, it was solid at 5.14v.
With the connector unplugged, there is still no voltage on any of the other pins.

I can remove the board and check the voltages across the 3 largest capacitors (in the lower right portion of the board as...

Re: JVC JLC47BC3002 47" LCD TV Dead - No power on , no lights

Are there diagnostic recommendations for testing the main board, or is it usually recommended to just replace the entire board?

I have a JVC JLC47BC3002 47" LCD TV that does not power on, and has no lights illuminated when plugged in. I got the TV in this condition, so I don't have a history of it.

Visually, everything looks good to me on both the Main and Power board. I don't see any burned components, or bulging caps. I measured the voltages at some of the points on the Power board. I got 212.0 VAC on both sides of the main power fuse (the only fuse I found on the PCB).

The only voltage I measured from the PCB to Main board connector was 5.14v at the labeled 5.2V terminals, all others were...

Re: New Members - please post your introductions here

Hello, new member from Madison, AL.