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46" RCA, CTC169PA, pulsating power supply.

I have a RCA 46" rear projection set that I hear pulsating when plug up. I measure the 5v standby voltage it pulsate between 0 and 3v. The primary power regulator transistor is ok and horz-output transistor is too. I replaced main regulator caps., IC, and transformer. Can anyone help.

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Re: 46" RCA, CTC169PA, pulsating power supply. - LG RU-52SZ51D 52" Rear Projection HDTV-Ready Television Projection...

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Posted on Feb 19, 2008

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Technosonic LCD3251 TV remains in standby

Sounds like a signal board issue to me.... If your power supply lines are fine.... Seek a good one on EBAY or shopjimmy.

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My mitsubishi ws65807 remote stopped working and also the front console buttons would not work, couldn't even turn unit off. Unplugged tv and plugged back in. Green light blinked 2-3 times and then...


the first three flashes when the set is plugged in indicate whether or not the microprocessor has initialized. The sections involved are the microprocessor, the standby power supply, and the buttons, LED, etc.

The most common causes I have found are the standby power supply, the front panel assembly, and CRT fluid leakage. Are you comfortable working inside the set? This may or may not involve measuring live voltages with a multimeter

If yes, the first step a technician would take is to remove the speaker grill(s) and then the front cover at the bottom. A quick check of the front panel is to simply follow the wires from the bottom of the screen assembly until you reach in-line connectors. Disconnect these (squeeze clip on the side of connectors) and then plug in the set and try the remote pointed at the screen. If the set powers up, then the front panel assembly is bad.

Also, inside the front, view the PC boards for CRT fluid leakage. The fluid is (originally) clear and is slightly thicker than water. Any fluid whatsoever, even a drop, can cause damage to the PC board. The fluid will cause any dust in the set to discolor; this may make it easier to spot (please look very carefully).

The next step is to check the standby power supply accessed through the rear of the set. The main fuse is suspect (F9D00), although not likely if you are hearing a sound when the set is plugged in. Two other fuses to check are pico-fuses in the standby power supply (F9A01 and F9A06). These are located on the center (Power) PC board, near the center of the board, toward the rear. If either of these are bad, then there is likely another failure that caused it. Of course, if any fuse is changed, please use the same value only (I have the manual to look up the values if needed).

If all these are good, then the next step is voltage measurement of the standby power supply. I will pause here and wait to hear your results.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

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the rca itc222 chasis has no front led diagnositc codes. Does the led flash imedatly when you plug it up. or does it start when you push the power button. if it does when you first plug it in then you have a problems with what is know as standy voltages. voltages that are always there when you [lug the set in. the processor does not see correct voltages. now if this flashes occur when you oush power button then there is problems with the secondary voltages also known as run supplys. does the set try to turn on do you hear static.. if not then you might have high voltage flyback or horizontal output problems.

Sep 24, 2008 | RCA D52W20 52" Rear Projection HDTV-Ready...

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About the DLP TV you helped with.

Brandon. Locate CN110 on the DMD its a wire plug. Pin 2 is gorund pin 4 is voltage for the color wheel. When the color wheel is off pin 4 should have 5V on it when power is pressed it should have 7v for the color wheel to start. If the voltages on pin 4 is 5V your DM is ok and Color wheel would be indicated as faulty, But if pin 4 is anything less than 5V its the DM which is faulty.

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RCA P46924 46 in rear projection tv will not turn on

More than likely it has bad solder connections on the circuit board. You could try tapping lightly on power supply/deflection boards to see if it makes contact. Usually I find bad solder on those right under where the power cord plugs in, on the bottom of the board. If you have a soldering iron and solder you could save a few hundred dollars in repair costs, but use caution and make sure all power to set is disconnected. Maybe mark each plug as you disconnect them. Hope this helps. Good luck, Russmann.

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RCA d52W19Byx1

Check to standby voltages, the three of the five and a 7.5 voltage going to the SSB main PCB if these voltages are there most likely have no horizontal drive.  You'll need to replaced the SSB part # 264120. I recommend that you have an authorized RCA servicer replaced the board, convergence data needs to be uploaded to a computer via a chipper checker.  Because a full convergence is quite difficult.


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Sony Big Screen TV Not Powering On

This looks like a problem with the High Voltage or switching power supply section of the TV set. What you need to do is to measure the voltage from the HV transformer to the Anodes of the CRTs with a high voltage probe, and check the voltage output of the switching power supply. What may have happened is a component may have shorted out causing an over-current condition with is triggering the shutdown circuit (These are the relays you are hearing). I would check the Horizontal Output transistor, and the components in that section of the TV.

In addition check the voltage test points on the HV / Horizontal and switching power supply board. This will determine if the section is working or not (most likely not). Make sure you have a schematic, and multimeter and a high voltage probe.
I hope this helps,
Thank you,

Aug 15, 2007 | Sony KP-46WT500 46" Rear Projection...

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46" projection not coming on

You have an power supply problem & or a high voltage flyback transformer gone bad. The regulator is usually an STK followed by some numbers, located on a separate small board above the main chassis in the rear of the tv. The flyback is down on the main chassis & has a red high voltage lead wire coming out of it that goes to the high voltage/focus block.

Aug 07, 2007 | RCA P46924 46" Rear Projection Television

1 Answer

Rca rear projection tv about ten years old

This problem is a hard one to diagnose as it could be 1 or a combination of things . It could be a bad solder connection or a power supply problem or a horizontal =sweep problem . need more info man . BUT if your not a tech its highly advised to you that you seek a pro to assist you as theres very high voltage in these sets even when they are un plugged and off for a while. There are no used wserviceable parts inside this set. Good Luck

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