LCD1502DVD 15" TV - No Power

[pyrosster]

Hello,

I am trying to troubleshoot a 15" TV that does not turn on, no sounds/relays, etc. dead.
I checked power supply and there's a broken "resistor fuse". (picture below) What's the value of this "resistor fuse"? 56 ohms? Can I change this with a normal resistor?
Power supply is 12V 5A.

Thanks for any opinion or insight

[tom66]

Re: LCD1502DVD 15" TV - No Power

Is that device original? Could it have been accidentally incorrectly replaced?

A 15" LCD TV would use about 2 amps on 12V. The 56 ohm resistor would allow an absolute maximum of 12V/56R = 210mA. Therefore, I doubt it is 56 ohms. A value of less than or equal to 0.56 ohms would be expected.

[pyrosster]

Re: LCD1502DVD 15" TV - No Power

Thanks tom66 for your reply.

The device is original. It's a 15" TV with DVD player. So the fuse resistor could be changed with a 0.56 ohms 1/2W normal resistor?
The sticker on the PCB (250V/6A) is confusing because the power supply is 12V and the part AZ1084S2 is a low dropout linear regulator.

Thanks again.

[tom66]

Re: LCD1502DVD 15" TV - No Power

Does the 12V output from the power jack go anywhere else?

[pyrosster]

Re: LCD1502DVD 15" TV - No Power

It's very strange. The chassis have this sticker: Power input: 110V-240V 50/60Hz 48W
But the mainboard only have a 12V connector and the transformer sticker is 12V 5Amp.
The manufacturer changed the design?

[tom66]

Re: LCD1502DVD 15" TV - No Power

Probably printed many stickers and decided to use them anyway..

[pyrosster]

Re: LCD1502DVD 15" TV - No Power

tom66, how can I replace that part? Normal 0.56ohm 1/2W resistor is ok?

[tom66]

Re: LCD1502DVD 15" TV - No Power

I think a fuse will work, I still don't think that's an original part...

[pyrosster]

Re: LCD1502DVD 15" TV - No Power

What type of fuse? which value?

[tom66]

Re: LCD1502DVD 15" TV - No Power

I usually take 1.5~2x input current so 7.5A to 10A that being said a 15" would normally not use more than 2 amps so maybe 3 to 5 amps rating. Slow blow type.

[pyrosster]

Re: LCD1502DVD 15" TV - No Power

Thank you!