Question about Sony BRAVIA KLV-32U100M 32 in. LCD Television

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I hv changed and replaced all three , the mother board, draffon board and power supply board in my KLV32U100m since it went off from the protection system. now the power gets on but no picture ( cannot see menu or any other system) but the back light is on

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I just fixed mine. the picture would fade off but the power was still on. I replaced the A board (the one all the componets plug
into).It's been 3 months with no further problems.

Posted on Jun 24, 2011

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I would check the ribbon cable that connects the LCD remove from connector and reconnect. The connector, ribbon cable or the points it connects to the LCD panel itself could be bad. The only way to really be sure is to install the LCD panel in a working TV and see if it works.
I have purchased TV's with cracked screens (that powered on) ebay fairly cheap for this purpose a couple time's and it has worked out well.

Posted on Sep 14, 2010

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Can a microwave be repaired?


Yes it is repairable, but if you do not have any experience in the repair of microwave ovens do not engage in their repairs because it is one of the most dangerous household appliances and the consequences can be disastrous. If light and turntable works than low voltage circuit (220V or 110V) works well. In this case the problem is in a high voltage (HV) circuit which is made up of the magnetron, HV diode (rectifier), HV capacitor and HV fuse or protect diode. Failure is in any of these components in "HV circuit" or in the main board. If light and turntable does not work than fault could be in power supply elements like: power supply cord, transformer, power board, fuse (glass or ceramic, ussualy 8A, 10A or 12A) on power board.

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First, you must be sure which diode is blowed, reactifier or protect diode.

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How about the power supply board? Is it producing the correct voltages to operate the other boards? Is the voltage present on the end of the cables connecting the power supply to the other boards? Does the power relay click when the power on switch is pressed?

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Sounds to me like when the power supply went out it allowed a surge to hit the mother board and you will have to replace it also .Look at the mother board and see if there is a green LED light showing if it is you are getting power to it and you have capacitors blown if not recheck you connections from the power supply and MB if they are all tight and correct then just figure on replacing the mother board

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Plasma sets have two separate power supplies; the main supply produces voltage for everything and may even produce a specific voltage for the high voltage required by the plasma display.
In your case, it is likely that the latter (HV) supply has failed.
This may be a separate board and if so, may be user replaceable since these are normally outsourced and just plugged into the set during assembly.
Removing the back of the housing, you are likely to see at least three boards. One of them (the main board) will have many components and most will be smaller in size. The main power supply will have much larger parts on it and the high voltage supply will likely be connected to it and have far fewer parts than the other boards.
It is possible but unlikely, that the main power supply is not providing voltage to the HV board for the display.
If replacement of the HV board doesn't restore the display, then it will be necessary to replace the main power supply too.

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The X-Ray Protect circuit monitors:
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The X-Ray line is normally High. If any of the monitored sources exceeds its' specific reference, the X-Ray line is pulled Low, shutting Off the TV. If X-Ray protect shuts the TV Off, pressing the Power button will turn the TV back On ( it will shut Off again if the problem still exist).

Possible Problems: Power Supply Fault, Sweep Circuit Problem, Doubler Board Fault or a leaking CRT. You may have bad capacitors in the power supply or the sweep power supply.

Check for CRT leaking, few drops of clear light oil. If this is leaking the fix is costly and not worth fixing.
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