Question about HP 1502 LCD Monitor

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My hp1502 does not come alive. no light when power is connected.have changed the cable. should open the back?

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There are lethal voltages inside your monitor even when its turned off and unplugged. If you are going to open it be very careful.

You may find some visibly swollen electrolytic capacitors, or some bad solder joints... but you will not be able to diagnose any other faults without some test equipment.

Posted on Aug 27, 2010


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What is year--make--model? You can't get the battery in or out? Also, with some vehicles, you may be ahead to use a memory saver that plugs into cigar lighter or power outlet, to help keep some memory systems alive if you have to disconnect battery.

Some systems if they lose memory it can cause problems.

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  • Open KAPWR circuit
  • Damaged PCM
  • Intermittent KAPWR Circuit

    Note: If KAPWR is interrupted to the PCM (that is, when a breakout box is installed or the battery is disconnected), DTC P0603/P1605 can be generated on the first power-up.
  • Inspect the battery cables for loose connections, corrosion.
Are the battery terminal connections in good condition? Yes No KEY OFF. Battery terminals are OK. GO to QB2 . REPAIR battery terminals as necessary. QB2 INSPECT ENGINE COMPARTMENT FOR PROPER WIRE ROUTING
  • Inspect Electronic Engine Control (EC) System wiring for proximity to ignition components or wires.
Is wiring too close to ignition components or wires? Yes No REROUTE as necessary. Engine compartment wire routing is OK. GO to QB3 . QB3 CHECK KEEP ALIVE POWER (KAPWR) TO PCM
    Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.
  • Disconnect PCM.
  • Measure voltage between KAPWR circuit at the PCM harness connector and ground.
  • While observing digital multimeter, grasp the Electronic EC harness and wiggle, shake or bend a small section while working from the PCM to the dash panel.
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then connect teh cables back one by one
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