Question about Westinghouse LVM-37w1 37 in. HD-Ready LCD Television

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Schematic Diagram for the DPS-336AP

I have been trying to find a schematic diagram for the Main Power Supply PCB P/N DPS-336AP. I got a replacement unit from Discount-Merchant and the LCD Monitor is working normal. I would like to trouble-shoot and repair the failed PCB. Any ideas as to where I might find the schematics or a service manual? I have not had any luck searching the web.

George Campbell

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  • bradl33 Sep 29, 2008

    Same problem. Did you make any progress on getting a Schematic Diagram or repairing the bad PCB? As I understand your posting the new PCB (DPS-336AP) resolved your problem?


  • Charles41 Jan 16, 2009

    Chris...The problems you discribed a similar. I would get normal ops for varying periods of time, then a click sound and nothing. The powersupply board shuts down. the lamp shuts off and the audio also shut down on my unit. At first i just had to shut it off and restart...but the problem got progress. worse. It sure sounds like you have a powersupply problem. Mine was intermittent to start and had variable symptoms, but they all pointed (like yours) to the (DPS-336AP) PCB.

    And Brad...I have had no further problems since I replaced the

    Power Supply PCB.

    Good luck,

    George C.

  • bradl33 Jan 18, 2009


    Where did you get your replacement board? I got one from a vendor on ebay but it did not fix the problem. The board they sent may have had the same issue.

    Thanks for your update. I sure wish we knew what needed to be fixed on the board so everyone did not have to keep getting an entire replacement board.


  • cyblood May 11, 2010

    Charles41 - I read your original post about "loss of picture and sound" and assume you fixed the problem with the DPS-336AP replacement. I'm leaning toward performing the same replacement on my LVM-37w1 but wanted to know if you could clarify with me if you also had the following issues that I'm experiencing before I do so. The symptoms are as follows:

    When powered on, the display lights up for a few seconds, just long enough to display what the input is in the top right corner (vga, dvi, svideo, and etc.). During this period I have a normal power button color (blue lcd). Then the display goes off and the screen is dark as if it were off. The power switch lcd light then turns orange as if it is in hibernate mode.

    Is that what you were ultimately experiencing? Greatly appreciate your assistance.




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SOURCE: DPS-336AP Replacement

Surveillent what were the symptoms for your tv that helped you figur out power supply issue?
lord_snot do you have 8 lines or do you see any lines seen on the menu. I have lines and multicolored dots on menu picture displays with red and green all over screen and only in a/v input hd ypbr 1 or 2 ypbr do not detect input. do you get a picture in a/v mode whats it look like can you send me a picture su

Posted on Sep 01, 2009


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DPS-336AP Replacement


I was going to post later this week but I have been running perfect, without any problems at all for over 6 days now! I just went in and replaced the DSP-336AP. I took digital photo's once I pulled the back off to be sure all connectors went back on and I was careful not to touch any other wiring. You will need to also pull of the power cable connector in order to pull off the power supply cover as well as it slides out and the power connect thing blocks it. I did see that although the revision of the DPS-336AP was exactly the same as the newly purchased one, the serial number of the one I purchased on eBay was a few hundred newer or higher. I was hoping that it was a new rev and hoped that Westinghouse fixed the problem. Nonetheless, all is working perfectly once again. I paid about $150 for that DPS-336AP on eBay and there were only two sellers on eBay offering this board. Good luck and please take the time to update me as well. I suspect W sold a few thousand of these TV's and you and I will be the only ones who fixed them ourselves. Anyway, good luck to you!!!!!!!

Sep 29, 2008 | Westinghouse LVM-37w1 37 in. HD-Ready LCD...

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Busted component

Getting a schematic is rather doubtful. You might be able to get a general idea of the circuit from somewhere on the 'net.

Was the power supply dead?

ATX style power supplies have both a standby and main section. The standby supplies a low current +5 volts to a small portion of the motherboard.

If the component failure is in this section, this standby voltage will be missing or incorrect, and the computer will be dead- won't power on at all.

I've seen a number of catastrophic failures in this standby circuit, and repair isn't suggested or economically feasible, especially as some parts often poof beyond identification.

When the pwr button is pushed, the main section comes on, and supplies +5 (Red wires), +12 (Yellow wires), +3.3 (Orange wires), -5, -12. Look here for this info

Voltages are precisely regulated, and any substantial deviation (more than a few 10ths of a volt) indicate a problem, especially on the +5 & +3.3 lines.

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