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Aric
Aric, Technician
Category: TV
Satisfied Customers: 42512
Experience:  15+ years in the field. Owner of AV Installation, OEM and Repair company
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The TV won't turn on. No picture and no sound.I've got the

Customer Question

Hi,
JA: Hello. What seems to be the problem?
Customer: The TV won't turn on. No picture and no sound.I've got the back off and I find 24v to both sides of the little fuse on the inverter.
JA: Sometimes things that you think will be really complicated end up being easy to fix. The TV Technician I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so he can help you best.
Customer: I do hear a clicking coming every few seconds from the power supply.
JA: Is there anything else the TV Technician should be aware of?
Customer: it is a 40" Sharp LCD
JA: I'm sending you to a secure page on JustAnswer so you can place the $5 fully refundable deposit now. While you're filling out that form, I'll tell the TV Technician about your situation and connect you two.
Submitted: 10 months ago.
Category: TV
Expert:  Aric replied 10 months ago.

Hi, What's the model number off of the back of the set?

Customer: replied 10 months ago.
40PFL3705D/F7
Expert:  Aric replied 10 months ago.

Okay, so this is a Philips not a Sharp then??

Customer: replied 10 months ago.
It's a Sharp.
Expert:  Aric replied 10 months ago.

That model number is ***** Philips- not a Sharp. Check again.

Customer: replied 10 months ago.
I'm sorry it is a Phillips
Expert:  Aric replied 10 months ago.

Thank you. That clicking from the power board can be caused by several things. I need to know if the clicking occurs as soon as the set is plugged in or only after the power button is pressed?

Customer: replied 10 months ago.
It clicks when I plug it in and when It is unplugged, but it clicks every few seconds as long as it is plugged in.
Expert:  Aric replied 10 months ago.

Thanks for the reply. This is a mainboard failure on the set- since it provides the turn on command to the power supply. The clicking is the relay on the power supply board cycling due to a faulty turn on command. You would need to replace the mainboard to fix this issue in most cases. Have you measured the standby voltage to the mainboard or any voltage OTHER than the 20 volt output?

Customer: replied 10 months ago.
I tried to find voltage at the fuse on the board at the top center of the set, but I could not detect anything there. Where else could I check?
Expert:  Aric replied 10 months ago.

The fuse is not where you check- if the fuse were bad there would be no light, no clicking- nothing at all.

Expert:  Aric replied 10 months ago.

Check connector CN1803 for your 3.3 and 12 volt DC outputs using your multi-meter please and tell me which ones are present (if either).

Customer: replied 10 months ago.
Okay, where will I find CN1803?
Expert:  Aric replied 10 months ago.

It's literally labeled CN1803 on the power supply board.

Expert:  Aric replied 10 months ago.

Top center of the board in the picture below:

http://www.shopjimmy.com/philips-a01p0mpw-001-power-supply-unit.htm

Customer: replied 10 months ago.
I've got 3.38 v at CN1803.
Expert:  Aric replied 10 months ago.

Thanks for the reply. How about the 12 volt pin on that same connector please?

Customer: replied 10 months ago.
12.14 v at the 3rd and 4th pins.
Expert:  Aric replied 10 months ago.

Those voltages are present soon as the power cord is plugged in or only after you press the power button?

Customer: replied 10 months ago.
I unplugged and then plugged in without touching the switch and the voltages are present there.
Expert:  Aric replied 10 months ago.

And the power board is still clicking while you're testing for these voltages?

Customer: replied 10 months ago.
Customer: replied 10 months ago.
Are you on break?
Expert:  Aric replied 10 months ago.

I'm sorry, but I will need to opt out of the question at this point. It is now open for other experts to view and assist.

Customer: replied 10 months ago.
Good morning. My TV is still out of service and your so called expert has abanded the cause.
Customer: replied 10 months ago.
I must resume this chat in the AM. That should give you time to do some research.
Customer: replied 10 months ago.
How do I give this jerk my rating?