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Re: power supply not working
Hello my friend, if one of your power supply's part is burned, your power supply won't work else if its work i has a short time to operate and it will be burned the whole board of your supply. Mainly the reason of burning your supply are the following:
1. The Electric supply from the source is to high or above the limitation of your Power supply.
2. Your power supply is over capacity.
3. You're power supply board develop a liquid moisture inside that is why it shorted and eventually the board is burned.
4. The load of your power supply is overload due to some device you attach that is beyond to the limit of your power supply's wattage capacity.
Note: try to see the wattage or voltage or the capacity of your power supply can supply the electricity within your computer system. To ensure that it does not exceed the limit of your power supply's limitation.
I therefore reccomend that to avoid burning the entire power supply board from short circuit, it is recommended to replace your power supply to avoid incidents may arise.
Hope this advice helps your problem.
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Hello, resistors burnt out, why? If you replace the resistors will the new ones burn out? What you need is a diagram of the unit and you can get the resistance readings from that. But the question still remains, what caused the burn in the first place and have you repaired that?
The resister called for is R202, which is a 1 Watt resistor and makes up a "snubber network" with C211, which must be replaced as it shorted, which caused R202 to burn out. This short will not show on any tester as the short only occurs above 25 KVAC from the spikes that this system typically produces. Do not replace C211 with same value capacitor, because it will also fail. The MFD rating must be the same to resonate with the frequency, but up the VAC rating. Engineers typically design these @ 12-25 KVAC and you need a rating of 35-50 KVAC, since the voltage spikes easily exceed 30 KVAC.
Please give motr of the devices fixed on same heat sink. Search for SMPS IC like FPS or similar, search their application notes and the datasheet of the nMOS. then you can get idea. without those data Solution is impossible.
From my experience most people find out their Convergance IC's were the cause and burned out again because of faulty 6.8 ohm resistors or just plain failure to replace the the resistors when they replaced the IC's. sadly if your planning on spending more money I suggest New IC's use 150's instead of 120's ALSO, make very sure you've changed out all 12 resistors and make sure they are metal film resistors.
What you possibly need: (2) STK392-120 OR STK392-150 IC chips (12) 6.8 Ohm Metal Film resistors 15 watt pencil solder pencil, DO NOT use a high watt iron you will fry the surface mounted item. good leaded solder, and flux
BTW, if you give up on the TV I'm still looking for a Convergance circuit board yours sounds fried but I would mind trying it out its better then nothing, and ther are a few other people on here looking for parts... so you never know...
"Power board: The power supply is the main culprit for most of the TA-E9000ES failures. Symptoms of this are no sound and a very dim or no display. Apparently the power board has several weaknesses which have caused Sony to supply a modified version in later production units.
The circuit around transistors Q108 and Q109 are prone to oscillation, which will cause one or both transistors to break down, as well as resistor R124. This resistor is originally a surface mounted device capable of 1/10 watts of heat dissipation. The modification suggested by Sony is to replace this 4.7 k ohm resistor with a 1 watt rated version. Also, to prevent further oscillations a 100 pF capacitor is added in parallell with R153.
(Some suggests that also transistor Q110 is a candidate for replacement.)
The US issued service bulletin from Sony suggest that this fault may occur with units having a serial number in the range 800001 - 802746. Serial numbers 80#### are for the US/Canadian version. Serial numbers 50#### are for the european version."
Ran my 595 blind for 2 years and finally spent the time to diagnose it this year. Turns out that one of the resistors that is on the power supply went bad. Similar problems have happened with later models so i thought the same may be true for the DS595.
My Receiver has always run fine.. just no display anymore.
Here's the fix. Replace R9501. its on the larger board that is part of the Power Supply. You will have to take the 4 large screws out of the base of the big heavy power supply block to find the resistor. I believe the old resistors is a 1/4 Watt. I replaced it with a 1 Watt so that it can handle the heat of being turned on and off better.
The resistor you will need to buy is 2.0 Ohm. I wouldn't go anything less than a 1/2 Watt and preferably 1 Watt.