Question about Gateway GTW-P42M102 Television

1 Answer

Set has bad power supply,

I have found two bad transistors in the power supply, numbers on transistors are SK0249...K0249U...I can not find them,, OR can not find the whole Power supply,,Have called Gateway they don't have one,,or Sampo the PME42S6 is NOT the same,, I ordered one and don;'t even hook up the same. Sent pix to Sampo of my GTW-P42M102 gateway.. they don't have any like it... ANY HELP????thank you bill

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  • Anonymous Sep 17, 2008

    Hi. I have the same power problem, too! What Q # are the two transistors? Are there other problems with the PS? DM company lists the supply new for $179.00 but have no stock and no idea when.

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1 Answer

Hey there...
When I fixed the parts on my same model, I aways ordered from www.digikey.com. You'll find your transistors there.
Jim

Posted on May 04, 2008

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Blawn AC fuse


Almost every modern set will just go into power supply shutdown if the horizontal output transistor is bad or other problems place a heavy load on the secondary side of the supply. Usually that results in a ticking or whistling from the set, but it won't blow the main fuse. A blown fuse typically means shorted parts in the primary side of the power supply.

The switching supplies used in today's sets can be a real pain. Check for a shorted input bridge rectifier or shorted switching transistors. There are also optical isolators used to provide control feedback and they can go bad, causing the supply to run away and blow up parts. A service manual or at least schematic diagram is very helpful. You might be able to find one online. I've checked my files and I don't have anything for the chassis used in this set.


Apr 01, 2009 | Panasonic Televison & Video

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Lightning damage


Replace the parts with the original ones, a .5 ohm difference on a resistor on the video circuits will cause the unit not to work correctly.

Sep 27, 2008 | JVC HR-XVC27U DVD Player/VCR

Tip

Basic Standard TV Troubleshooting Techniques.


When you turn your television on and get nothing but a clicking sound you could have almost anything wrong with it.

The two most likely places to look are the high voltage section and the low voltage power supply. In order I will explain what to check to try to resolve the problem.

First, is the standby light blinking in some sort of pattern? If so, count the number of times it blinks between long pauses. If it is blinking in a patten, this is an error code, and can be helpful in diagnosing the problem.

Depending on the manufacturer the blinking pattern will mean different things. Error code lists are available by googling "(manufacturer) tv error codes". Proceed from here based on the information provided by the error code list.

If your set has no blinking lights proceed by unplugging and looking at the mainboard for burned resistors or bulging electrolytic capacitors.

Electrolytics look like little cans, with shiny ends and are generally black, grey or blue. They have a positive and negative lead so be careful when replacing to get the polarity correct.

If they are bulging replace them. Also replace any bad resistors found. Resistors must be replaced with similar units and cannot be derated.

Resolder any bad connections on the low voltage power supply and certainly the high voltage power supply. That would be most or all of them.

Finding no charred resistors or bulging caps, and after resoldering all connections, your unit still does not work, check the horizontal output transistor for failure.

Using a DMM on diode check, check the transistor out of circuit for shorts/opens between any two leads. A good unit should have somewhere between 500 and 1000 ohms one way and infinity when the leads are reversed. Only two lead configurations will show conductivity. One set of leads should show infinite resistance both ways. If the transistor checks bad, replace it and the flyback. If you are not sure about the results replace it. Check all resistors and diodes in the HV circuit and replace any suspicious units.

If the horizontal output transistor checks OK, check all semis in the LV power supply. Replace any bad units found and check all associated resistors and replace as necessary.

If both the HV and LV sections check OK, remove the circuit board from the CRT and try the unit. If it runs your CRT is bad and needs replaced. If it does not run your problem is elsewhere.

Working one section at a time, remove and isolate any remaining sections while attempting to turn unit on. If unit works with a particular section disconnected, your problem is in that section and you will need to do normal troubleshooting procedure, listed above, on the section in question.

If after all the above procedures are tried, and your unit still isn't working, you may have to replace an entire board. These days most boards are relatively inexpensive. The most likely board would be the LV power supply which usually contains the HV power supply also.

Any parts or boards needed can be ordered at http://www.encompass.com or http://www.shopjimmy.com .

Good luck with your troubleshooting and be careful while inside the set especially near the High Voltage second anode where it connects to the CRT.

Thanks for using FixYa and the great rating. Please consider a testimonial.

hardrocko

on Mar 27, 2010 | Televison & Video

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Mitsubishi CS-40503 Zapped by high voltage


the only option is to bring your x-former as sample or take a pic of it and post it.

Mar 26, 2009 | Mitsubishi CS-40503 TV

1 Answer

Transistor lost.


if you are replacing 7402
also replace diode 6404 this diode even thou it test goo will in long term overheat 7404 and caus it to go bad by leakage.
and if 7402 gose bad it is regulating the 15v stanby volts that is 7412 is also going to be bad so replace 7412 also
now
the part numbers are:
7402 = # 932211676682

7412 =# 932210514682


thanks,
daniel.

Jan 13, 2009 | Philips 19PR19 19" TV

1 Answer

ZX-8100


I'm not familiar with that particular amp but generally, the only transistors that burn are the ones in the power supply. If the adjacent transistors had numbers like IRFZ44, IRF3205 or similar, the burned transistor is likely the same as the ones next to it.

Confirm that the center and right-most leg of the burned transistor and the transistor next to it are directly connected by large traces on the circuit board. Also confirm that the center leg goes to the large windings of the power transformer. If it passes these tests, the transistor is one of the power supply FETs. The numbers on the adjacent (parallel connected) parts will be the same as the burned one.

Jul 16, 2008 | Volfenhag ZX-8200 Car Audio Amplifier

1 Answer

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I'm going to guess that you have a Sony set based upon the circuit designations that you listed. If that is so, you really don't need the entire module. You will need to replace the transistors and a resistor. Possibly a cap or two will be required as well. Please post the model number and further details shall be provided.

Thanks,
Dan

Jul 03, 2008 | Televison & Video

1 Answer

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This is part # 260527 and is still available for $3.55.
I was not able to locate an ECG sub.
Dan

May 15, 2008 | GE 24GP653 24" TV

4 Answers

Tv wont turn on


Replaced two N-Channel Mosfet transistors(FQPF13N50CF-ND) and some faulty electrolytic caps in the power supply. I found the Mosfets online at Digi-Key. Mosfets are difficult to read. Only one read bad but I replaced both because they are in the same circuit. Set works great now.

Jan 21, 2008 | Olevia LT23HVX 23 in. LCD Television

1 Answer

Will not turn on.


  • proceed as given after your power supply is ok (your statement)
  • isolate power supply from h/output stage.
  • check diodes & capacitors connected with flyback transformer.
  • check for print short.
  • ckeck h/output transistor.
  • connect supply to h/output stage.
  • put on the set.
  • hope this will help.
  • good luck

still there is a drop in voltage then your fly back transformer faulty.

 

Oct 12, 2007 | RCA F32450 32" TV

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