Question about TruTech PM1919BXA1 19 in. LCD TV

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The back light turns on for about 1min and then turns off i allready replaced the dm and power board what could it be

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Hi there,
Just wondering if they were new or second hand boards you used. I would be inspecting the inverter circuit for the back-light is causing the problem for you. Short of replacing that also,I would be looking at repairing the area itself. If you have some electronics experience and the tools required...common problems you may find are

  • dry solder joints about inductors, power transistors and components that run hot. The heating and cooling associated with running then turning off produces dry solder joints over time.
  • replace electrolytic capacitors in the inverter stage. They can also over time dry up and their effectiveness be reduced.
The fact that it operates for 1 min makes sound like a heat related problem. There are methods of determining problem areas using freeze spray to cool individual components to determine if they are the offending part. Be careful to avoid moisture build up condensed from the air when using this method. Gentle prodding of the individual parts and spots on the PCB with a plastic tool can also help to locate any dry solder joints. Hard to tell you exactly where to look, but with perseverance, you may get to the bottom of it.
regards robotek

Posted on Apr 24, 2010

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TV won't turn on, red light flashes on TV and hear a clicking sound in back of unit is it worth fixing?


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Wont turn on the green light in front keeps blinking


Replace the dm poer board . its inside the metal box on the left (looking at the back with the back removed). p/n 935C986002
Or if you can solder then replace the 7 electrolytic capacitors on the DM power board. value 1000uf16v

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I turned on the TV but just got a black screen but could hear audio just fine. Turned the set off and unplugged it. When I plugged it back in the green timer light started flashing and would not stop...


Nonstop blinking is likely a DM or format board - format board most likely. I have rebuilt several of these by simply replacing all the caps, about 70 of them, and takes about two hours start to finish... But this set does need to boot. It takes about 70 seconds of flashing green light before you're able to press the power button - even when everthing is working as it should..
Hope this helps!

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William Rayburn, CET
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PO Box 442
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360-642-4993

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Mitsubishi WD62525 Dead NO Power-Won't turn on


Don't think dm board will solve your issue, might want to check power board for buldging caps.

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Have ws65869 tv


Replace the dm power board . Its inside the metal box on the left (looking at the back with the back removed). p/n 935C986002
Or if you can solder then replace the 7 electrolytic capacitors on the DM power board. value 1000uf16volt.

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The Mitsubishi Ws-55711 will not turn on.


Replace the dm power board . its inside the metal box on the left (looking at the back with the back removed). p/n 935C986002
Or if you can solder then replace the 7 electrolytic capacitors on the DM power board. value 1000uf16v

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I have a 37inch insignia


Some people I contacted said it has faulty capacitors that need to be relaced. Available at radio shack.
Most likely causes in order:
  1. DM Module Capacitors have FAILED.
  2. DM Module is defective.
  3. EEPROM Board failure
  4. Power Supply failure.


To replace capacitors:
  1. Keep yourself "grounded" when working with the circuit board. Static electricity will destroy electronic components.

  2. When replacing the Capacitors, press them "down" onto the circuit board as far as they will go, hold them down, solder into place and clip the excess terminal lengths flush with solder. Only by doing this will the metal shield (little silver box) slide down and over the circuit board during re-assembly. There is not a lot of clearance when doing this, as the 105C Capacitors are slightly longer that the originals. With minimal effort everything does fit back together.

  3. Use ONLY 105º C capacitors with a voltage rating of 35 V.

  4. Re-insert the DM circuit board into the Mother board; press virmly and ensure a proper seat of the DM board. Next, slide the metal case down and over the DM circuit board.

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Ws-55813 mod. green ld light wont stop blink tv wont turn on


The DM modul is bad. Replace all 1000mF/16V capacitors( be careful with the polarity). After replacing capacitors conect to AC power. Waith about 1min. Green flashing will stop. Turn ON tv. The modul is on the raight hand side next to the main board.

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Dm board (power supply) for mitsubishi rear projection tv (ws-55807)


Good day,

mohiuddin;

If the indicator stays on then you may have an DM PCB problem and to correct this do the the folowing:

SYMPTOM: Power LED does not stop blinking after plug in.

CURE: replace C9B01, C9B02,C9B10, and C9B11 (1000 uFD 16V) on the DM PCB. Replace them with part # 181P734030 (680uFd 16V).

The DM Board (PCB) is located on the very left side of the TV looking from back. Caution on removing Board and note what cables you disconnect to access the Metal Shielded Board.
Good Luck, big IRISH.

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1 Answer

Power Light Flashes On/Off.


The set is trying to tell you somthing by blinking this light. And the bad news is that it's sayiny the DM board is not booting up, there are several problems that might cuase this all from bad capacitors to a shorted diode or a compleatly replacing the DM board. but all these are not for the weakend tv tech this one has to go into the shop

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