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Powersupply No power on secondary stage on ply back

Posted by acern on

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Anonymous

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Replace q601, q612 ,r612,, r617

Posted on Nov 19, 2007

Simpson Neal

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Your main power supply may have failed or you've lost the horizontal drive pulse to the the horizontal output transistor. Also the flyback may be bad and the horizontal output transistor may be shorted. If this is the case the main power supply will not start up. These are a few things that may have happened. Stargazer

Posted on Sep 18, 2007

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NO VOLTAGE ON HEATER@AFC
Hi,

If your TV don't have heater at AFC.Try to check first the B+ voltage on the ply-back transformer if you have 110vdc.Use a multimeter tester (range on DC) then place the black test prob (-) to the ground of the TV and the other one is on the B+ pin of the ply-back transformer that usually found on the 3rd pin.

  • If you don't have a B+ supply,try to look at the power supply section and check some open resistor and shorted transistor and also look for the fuse if busted.
  • If you have supply voltage on B+,you should know if the ply-back have oscillation.Normally it have a humming sound if the ply-back is oscillated and test the secondary of the ply-back using multimeter tester (range on AC).
  • If the fly-back have oscillation and the heater still no supply check the resistor that comes directly from the secondary of the fly-back it usually have 5 to 7 volts ac.and replace it with the same value and wattage.

I hope this solution will be helpful.Thank you and good luck.
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Errore codeoxe0000227
1. Full power down. Unplug the power cord from the Power supply. Then hold down the pc power button.
Try to boot the pc.

2. Open the case and reseat the graphics card, hard drive, and RAM.

3. Take out one of the RAM sticks if there is 2 or more. Swap the RAM sticks in different RAM slots.

4. Set the Cmos jumper to clear. Power up the pc. Power down the PC. Set the Cmos jumper back to normal position, power up the PC.

5. Unplug and replug all the power supply cables.

6. Check the powersupply function. Either by a powersupply voltage checker, put the powersupply in a different pc, or try a different powersupply in the problem computer.

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Schematic
Yes it was fixed .I changed the original value of the cap to 47uf 63v which was connected between the ground and pin 3 of the power ic Tda16846 the power changed to 927 millivolts at the gate and was stable.it means the was two eletrolytic caps on the same stage with original one been bypassed by onother
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JVC TV- MODEL AV-K21T.
it was not necessry to replace so many parts if you go as per proper procedure.please proceed as 1 isolate horizontal output section from power supply & make power supply ok. 2 if it becomes ok check hor osc,driver&h/output section. 3 if it is ok connect power input to hor.section which was isolated. 4 check for loose contact or print. 5 put on tv .
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My LG DN191H DVD player keeps shutting itself off every 5-10 minutes while I'm watching movies. Every time it shuts down I have to power it up and go through all of the menus again. It's really irritating....
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