Question about Polaroid FLM-3734B 37 in. LCD HDTV

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37" LCD Monitor FLM-3701 While I was watching it went out as if the power went out, but the cable box was still on. There is no indicator light on the monitor. I have unplugged and plugged using different outlets and it still will not come on.

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Have the same tv and had the same problem. might be bad capacitors for the screen easy job to replace for the do it yourselfer and is not costly. just remove the back housing and feel the capacitors. if they feel like they bubbled up then they are bads and have to be replaced.you can find a step by step on youtube just type in the same info. good luck.

Posted on Jul 29, 2010

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Hi and welcome to FixYa

Initially, the described problem with the Polaroid FLM-3701would indicate a power supply problem. While this could be nothing but a fuse that blew, a faulty cord / plug or even no power to the outlet, it could also be caused by failure of the power supply to fully turn on either:

  • auto-protect has kicked in to prevent further damage;
  • the power supply itself has faulted and could not produce sufficient voltage to operate the unit.

This is then a hardware fault and would require that the unit be opened up to effect repairs.

Options then are:
  • consider a DIY (do-it-yourself) repair if and only if comfortable working with electronic components & circuitry, use of a DVM/VOM, a soldering iron/station and safe practices with electrically powered devices. Access to a Service Manual or at the very least, a schematic diagram would be a necessity;
  • should you be uncomfortable with a DIY, perhaps your best bet would then be to consult with and/or seek the services of an authorized Service Center or a qualified professional.

Offhand, while test points, voltage checks and repair steps could be provided, it is necessary to use a multimeter to determine voltages at certain pins while the Polaroid is live. Is a DIY being considered?

Good luck and thank you for asking FixYa.

Posted on Jul 09, 2010

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It looks like your power supply might not be providing enough current to get the LCD to power up. This LCD needs about 3 to 4 amps to work properly.

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A fuse does not blow for no reason. Most commonly a fuse will fail because of a short someplace on the board. I have this same TV. The fuse blew. The reason was transistor Q6 had shorted. There are two identical paired transistors on the output side. Q6 and Q7. They are both Infineon 11N60C3 MOSFET transistors. Check those for a short. There may be a burnt smell.
More commonly, this TV will fail because of bad capacitors on the power supply board.

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Hopefully the TV didn't receive too much damage. Inside the TV, there is a fuse that may need to be replaced. Radio Shack or other electronic store will carry these fuses. If this doesn't solve the problem, the Power Supply Board maybe damaged.

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