Question about Gateway GTW-P42M102 Television

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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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1 Answer

What is the name of the missing transistor at the space Q601?


I was looking for the same information, I found that the (Phillips 22PFL4507/F8, and 22PFL4507/F7) use the same power supply as the emerson, only difference, emerson I could not find a schematic, phillips I scored one..

Q601 is part number TK5A50D

22PFL4507 F7 Brand Model Chassis

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2 Answers

No picture no sound.


The screen is blank with no raster at all. There are indications that the channel numbers are changing in the display. This indicates that some of the low voltages are present but these may be derived from the standby supply. Assuming there is no deflection and no HV, you either have a low voltage power supply problem, bad startup circuit, or bad horizontal output transistor (HOT) or other bad parts in the horizontal deflection. Check for bad fuses. (If you have HV as indicated by static electricity on the front of the screen and you hear the high pitched whine of the horizontal deflection when it is turned on, then the following does not apply).
  1. Use an ohmmeter to test the HOT for shorts. If it is bad, look for open fusable resistors or other fuses you did not catch.
  2. Assuming it is good, measure the voltage on the collector-emitter of the HOT (this is safe if there is no deflection). You should see the B+ - probably between 100 and 150 V.
  3. If there is no voltage, you have a low voltage power supply problem and/or you have not found all the bad/open parts.
  4. If there is voltage and no deflection (no high pitched whine and no HV), you probably have a startup problem - all TVs need some kind of circuit to kick start the horizontal deflection until the auxiliary power outputs of the flyback are available. Some Zeniths use a simple multivibrator for this - a couple of transistors. Others power the horizontal osc. IC from a special line-derived voltage. The multivibrator type are sometimes designed to fail if someone keeps turning the set on and off (like kids playing) since the power rating is inadequate. Test the transistors if it is that type with an ohmmeter. If one is shorted, you have a problem. The usual way a TV service person would test for startup problems is to inject a signal to the base of the HOT of about 15.75 kHz. If the TV then starts and runs once this signal is removed, the diagnosis is confirmed. This is risky. Take assistance of some technician also..
All the best

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1 Answer

Power supply for akura aeldvd2yr31502vh


Which type is the power supply used? STR controlled or transistor controlled? Just check this site for more details. http://electronicshelponline.blogspot.com/
Pull up previous posts or type in the brand name and model number to of your set, to its search box, and press 'Enter' or view it in Mosaic / Timeslide option.
Power supply schematics to some TVs are given. Compare it.

Aug 28, 2013 | Flat Panel Televisions

1 Answer

No power to tv


Good day!!!

That problem is usually cause of bad or dead set power supply board..

You can buy the power supply board online just search the part # that usually found on the said board printed in sticker it is combination of letters and numbers..

Try to replace the board to fix your TV..

Hope it helps please rate my answer!!!

Thank you

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Akai LCT2662 won't turn on, indicator solid orange


Any luck getting this fixed?Please let me know.Thank You very much!
Tyler

Jul 13, 2010 | Akai LCT2662 Television

1 Answer

Our TV suddenly stopped working and will not come back on


Hello,

A blown fuse is a very common type of fault due to poor design very often triggered by power surges due to outages.However, the most likely parts to short are easily tested, usually in-circuit, with an ohmmeter and then easily removed to confirm.

Note that it *may be* useful to replace a fuse the *first* time it blows (though it would be better to do some basic checks for shorted components first as there is a small chance that having a fuse blow the second time could result in additional damage which would further complicate the troubleshooting process). However, if the new one blows, there is a real problem and the only use in feeding the TV fuses will be to keep the fuse manufacturer in business!

Sometimes, a fuse will just die of old age or be zapped by a power surge that caused no damage to the rest of the TV. However, it must be an EXACT replacement (including slo-blow if that is what was there originally). Else, there could be safety issues (e.g., fire hazard or equipment damage from too large a current rating) or you could be chasing a non-existent problem (e.g., if the new fuse is not slo-blow and is blown by the degauss circuit inrush current but nothing is actually wrong).

If the fuse really blows absolutely instantly with no indication that the circuits are functioning (no high pitched horizontal deflection whine (if your dog hides under the couch whenever the TV is turned on, deflection is probably working).) then this points to a short somewhere quite near the AC power input. The most common places would be:

Degauss Posistor - very likely.
Horizontal output transistor.
Power supply regulator if there is one.
Power supply chopper (switchmode) transistor if there is one.
Diode(s) in main bridge
Main filter capacitor(s).

You should be able to eliminate these one by one.

Test the rectifiers individually or remove and retest the resistance.

If these test good, use an ohmmeter with the set unplugged to measure the horizontal output transistor. Even better to remove it and measure it.

C-E should be high in at least one direction.
B-E may be high or around 50 ohms but should not be near 0.

If any readings are under 5 ohms, the transistor is bad. The parts sources listed at the end of this document will have suitable replacements.

If the HOT tests bad, try powering the set first with your light bulb and if it just flashes once when the capacitor is charging, then put a fuse in and try it. The fuse should not blow with the transistor removed.

Of course, not much else will work either.

If it tests good, power the set without the transistor and see what happens. If the fuse does not blow, then with the good transistor (assuming it is not failing under load), it would mean that there is some problem with the driving circuits possibly or with the feedback from the voltages derived from the horizontal not regulating properly.

Look inside the TV and see if you can locate any other large power transistors in metal (TO3) cans or plastic (TOP3) cases. There may be a separate transistor that does the low voltage regulation or a separate regulator IC. Some TVs have a switchmode power supply that runs off a different transistor than the HOT. There is a chance that one of these may be bad. If it is a simple transistor, the same ohmmeter check should be performed.

If none of this proves fruitful, it may be time to try to locate a schematic.

A blown fuse is a very common type of fault due to poor design very often triggered by power surges due to outages or lightning storms. However, the most likely parts to short are easily tested, usually in-circuit, with an ohmmeter and then easily removed to confirm.

But if otherwise your power supply board is died, It can be dead at anytimes.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Good luck....

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1 Answer

How to repair Vizio VP 322 power supply


Power Supply repair is NOT easy, but here goes. First Without Power do as"Dry" Multimeter Ohms, check of ALL discrete components looking for "Shorts" Check, Diodes, Caps, Resistors. Coils etc.., Check all Transistors, B.C.E. with your meter set on "Diode test" look for "Bad" junctions. Then you check to see if you have power to and on the "other side" of the Bridge Rectifiers/Diodes. if not, replace that. if yes, proceed. Check for the correct Voltages around the Controller Chip. and Check the output of the Chopper Transformer, Check to see if the Waveform around the Controller IC is right. Check ALL voltages are correct & within range.. Now during this you should have found the faulty Bit(s). Replace as necessary. BE CAREFUL. I always work on ANYTHING connected to mains through an Isolation Transformer.

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1 Answer

Need transistor


Finally I have managed to fix my plasma 6842PEM. My problem was the SS (Sustain) Board and not the Power supply. This board is the vertical one to the right connecting to the Screen/Panel. I tested every component on the board and found one of the Transistors on the heat sink was bad, part # 2PG001. This board is made by Panasonic which can be replaced. I got the Transistor which only cost $20.00 including shipping.

To identify wether this is your problem, disconnect the cable comming from the power board and put on the TV, If the green light stays on then this is your problem.

Thanks all for your help.

Laz

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4 Answers

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