This problem actually started two years ago. Took it to the local shop and cooked it for two weeks--no recurrance. Then a week ago, started again. Thought I might have faulty AC outlet and changed recepticles. Seemed to help for a week, then started again.
Symptoms: Set will spontaneously loose video and sound, displaying only a green raster with retrace lines for 1-2 seconds. Then shuts down (relay click is audible). On rare occassions it will spontaneously power back up within seconds. But most times, it requires restart with the remote (power button works equally well). The restart could last for hours, or (more recently) the problem resurfaces immediatly.
From the web traffic on this subject it seems to be quite common with Sony Wega's. Unfortunatly among all the complaints, I find no solutions.
Year's ago, in the old tube world, I did a little TV repair work. So, I ordered up a SAMS (#4933) on this unit and believe from reviewing the schematic that the problem would most likely be on the "G" Board (power supply/degauss). And while I acknowledge the possibility of a cold solder joint, the cost of a replacement board is around $150. Since I no longer have any test equipment, just looking for some forum support that my "hunch" is a good enough bet to spend $150 on.
I should also mention that I taped over the IR sensor, just to insure no spurious input was turning off the set--made no difference.
Any suggestions most appreciated. This has been driving me nuts for two years.
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Re: Intermittant power down
I have the same problem with my computer monitor. this is the reason I have not answered problems for two or three weeks.
I took the covers off to monitor the power supply, but it would not then go wrong. The fault is collapsing picture in my case, but it recovers nearly always. It has not got as bad as your TV.
The best way to deal with it is to buy a can of refrigerating spray.
If you know what is power supply, then cool the individual transistors or integrated circuits when it has been working for long enough to heat the components. This may cause the problem to occur.
Then you can change that component.
If this does not work then carefully attach wires to the various power supply voltages, so they come out of the casing. The casing can be put back so that it can get hotter.
Terminate the wires in a connecting block, including chassis (Ov).
Be careful as the mains voltage may be present on the wires, due to a live chassis.
Connect a voltmeter or voltmeters to the connecting block, and you will see which voltages are collapsing, after you switch on.
I will have to do this, so good luck!
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Re: Intermittant power down
I would check for bad connection and or componets in the sweep power supply and the main power supply. Pay special attention to the lower voltages like the 9, 12, and 15 volt sources. These sets these days do not pay to replace the entire board assy. you may, if you can narrow it down, contact PTS, a company that repairs television boards, at http://www.ptscorp.com, and see if ythey will repair the board you want. Good Luck
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The proble you have is an intermittant power supply or sweep power supply. Unless you can find a bad connection on the power and deflection board, this could be a very difficult problem to find. I have ran across this problem a couple of times, and after spending countless hours troubleshooting, I replaced the main board and all the problems were taken care of. The board part number is at samsungparts.com and I found the board for you. it is located here:
http://www.samsungparts.com/part_detail.asp?catalog%5Fname=Parts+and+Accessories&product%5Fid=BP94%2D01266A&search%5Fmodel=HCP4752W Good Luck
Dan, did you check the circuitry and relays to the motor, as was suggested on March 29th? If the motor can't get power it won't work. It seems, that this may be the problem, since you took the motor apart and there were no broken gears and all other electrical devices work. The other resolution was to contact R.H.Peterson Company, the manufacturer for more information, if all else failed.
jlichtenegge, Wish all lcd monitor problem descriptions where as good as you have done!!! Here are some suggestions. Use ACER warranty first if valid!!!! If warranty not an option, then do cash+old unit swap for a refurbished same model if ACER has a swapout program for infantile failed units. (short SMPS/CCFL inverter board lifespan) If monitor DOWN TIME is super critical then you or local electronics technician will need to DIY repair unit by resoldering the thermally fractured intermittant soldered to board component lead that is causing "switch-mode-power-supply" to go into full or partial shutdown mode. You may need an inspection grade microscope to visually locate the oxidized intermittant connection. Let me (lmistyrel on aim.com) know what you intend to do fmi Hope this helps. Read more of my fixya profile to get more of a handle on this type of failure. Bye for now.
You`ll probably find that it`s the interlock switch on the door latch. When the door is closed, the hooks that protrude from the door enter the slots in the oven casing and press down on the latch switches. DO NOT over ride these switches, replace them or get an engineer in to check them. Ian