Question about RCA D52W20 52" Rear Projection HDTV-Ready Television

1 Answer

1.-It works only 30 seconds and I can see a bad convergence.I checked all the voltages and they are ok,the transistors bdw93 and bdw94 are ok but the tv only changes off.What can I do?

Posted by on

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 51 Answers

What you most likely have is a convergence problem. The convergence circuitry is used to align your colors. What you describe sounds like that circuit has failed. Here’s a link to a decent video that will give you an idea of what is needed to fix it: http://www.youtube.com/watch?v=S6Wa8FvSz-s

Posted on Aug 30, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Horizontal red convergence jumps out after 10 seconds


This could be a transistor fault on the convergence board. You can diagnose with a can of freeze spray.

Freeze Spray works because of the way silicon chips such as transistors fail. If they are intermittent, then they'll work okay when cold. But as they heat up they'll flip to a failed status. A quick blast with Freeze Spay cools the component quickly enough to revert it back to its working status for a few seconds. That's long enough with a fault like yours to see the convergence flick back to good.

You'll have to work out for yourself where the convergence board is though.

Sep 11, 2014 | Office Equipment & Supplies

3 Answers

Mitsubishi 55 inch rear projection tv has convergence problem


It could be an issue with faulty capacitors around the IC's as well. You can make out which are faulty, because their caps willbe swollen on top. Here's a sample pic of a bust capacitor (not same model):
90f6aa1.jpg
Check the specifications of the faulty capacitors, and get the replacementsfrom your local electronics shop. If you are comfortable with this, you can usea pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors.Once that is done, solder in the new capacitors carefully. If are unsure how todo this, try to get a friend who knows how to do this kinda stuff do it foryou, or get a qualified technician. Warning: If you do nothave a background in electronics repair, or are inexperienced, get a qualifiedtechnician to do it for you.

REMEMBER there are very dangerous voltages inside a TVthat can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECTTHE POWER BEFORE YOU DO ANYTHING.

Hope that helps!

Sep 27, 2008 | Televison & Video

Tip

How to test Flyback Transformer Without taking it off the Boarda) Basically it...





How to test Flyback Transformer Without taking it off the Board


a) Basically it has to be acted upon by a supply voltage of at least 95V

to work.



sample picture:


7_31_2012_2_32_48_pm.jpg

b) Of course, assuming the horizontal deflection oscillator works, same

with the horizontal drive and horizontal output transistor



sample of H out transistor

7_31_2012_2_38_05_pm.jpg


It would generate output voltages on the secondary terminals

and 200V line will be active sending voltages to the

Video Drive circuits. Of course high voltage will be generated

ranging to at least 30 KV and there will be voltages on the G2 of the CRT.


c) The easiest test point to look when it is oscillating, is the CRT heater

voltage, the heater lit when flyback is good ( mostly at night times when it

is dark ) and you can hear sounds, too ( if speaker is connected).






7_31_2012_2_42_22_pm.jpg


• Heater : marked with letter H and H1

• Green Arrow for the G2 voltage


d) Having a B+ voltage reading of 75 V or lesser ( primary pins )

indicates a bad or partially shorted flyback, assuming your

horizontal output transistor and power supply are good & OK.





7_31_2012_2_47_50_pm.jpg





• These only applies to CRT type TV's.

on Jul 31, 2012 | Philips Televison & Video

Tip

A) basically it has to be acted upon by a supply voltage of at least 95V to...


a) basically it has to be acted upon by a supply voltage of at least 95V

to work.

sample picture

f3f741f.jpg







b) of course, assuming the horizontal deflection oscillator works, same

with the horizontal drive and horizontal output transistor

58689de.jpg






it would generate output voltages on the secondary terminals

and 200V line will be active sending voltages to the

Video Drive circuits. Of course high voltage will be generated

ranging to at least 30 KV and there will be voltages on the G2 of the tube.


c) the easiest test point to look when it is oscillating, is the CRT heater

voltage, the heater lit when flyback is good ( mostly at night times when it

is dark ) and you can hear sounds, too.

here is a sample image

ab6c901.jpg



marked with letter H and H1

Green Arrow for the G2 voltage


d) having a B+ voltage reading of 75 V or lesser ( primary pins )

indicates a bad or partially shorted flyback, assuming your

horizontal output transistor and power supply are good & OK.

sample of H out

b3363d6.jpg


These only applies to CRT type TV's.

on Dec 24, 2009 | Music

1 Answer

Power ok but not eht function


Hello

If you have tested the secondary section of the SMPS power supply of your Sony TV, amd found it OK I thinks, and posts this solution.

If the secondary supply rail 125VDC is found ok, just goto to the Horizontal Output Transformer, a small transformer diretly soldered on tho the main board, very near to the Line Output Transformer [LOT], and its secondary winding is connected to the base of the line output transistor, which in turn drives the LOT said above, generates EHT you described.
The base of the line output transitor must get appropriate frequency to switch on and off. This frequenct is gerally comes to 15625Hz. Just measure the voltage across the primary winding of the above said line driver transformer, which can be a possiblity open winding. Check the voltage at the collector point of the line drive transitor connected ti the one end of the primary winding is easy. Then check the voltage at the other end of that winding. There must be a little difference of 2VDC or so, if the line drive section is working, and fault is after that section, that is line output section. If you have a digital multimeter capable of measuring frequency, measure the frequency of the collector point of line drive transtor, and find out whether there is 15625Hz or near to this frequency comming out. Never touch the multimeter prob to the collector of Horizontal Outout Transistor, while it is working. Your meter will get damaged.
Line output section, contains tha LOT said above and line output transitor. If the Line Output Transistor has some sort of leak, normally collector to base leak, it will not drive the LOT to produce EHT and it wlii heat up also.
Just check it heat effect, after switching the set on for a short period of time, say 30 seconds ro so. If it heats up abnormally, suspect the line output transistor and LOT. You just replace the line output transistor first, with same type and number. If it doesn't retify your problem, LOT said abve is faulty, and it also should be replaced with same type and number.
If you have to replace the horizontal output transistor, and the LOT said abve, insist on orginal, and not replace it with a susbstityution, as these are critical components in all TVs..
If you need further assistance, get me through Fixya, and be free to conact me. Ok

Nov 29, 2010 | Sony KV-XA21M61 21" TV

2 Answers

I have a 54" Toshiba TV Model # 57H81. The only thing it does when I turn it on is a small red light in the front is flashing. Please help me! Thank you so much!


If you have some garbage in the main processor you need to leave it unplug for 40 MIN, to reset it back to normal. If that don't work then you need to check for a shorted horizontal transistor, mounted on a metal heat sink near the fly back transformer, that is what turns your high voltage on.. If that is good , then the next common problem would be is a bad convergence module, and you are looking at around 400 on repairs.

Oct 14, 2010 | Toshiba 57H81 57" Rear Projection...

1 Answer

I have Hitachi 43" hd rear projection tv - too much red


It's probably either a bad red CRT (the red projection tube) or a shorted (or open) driver transistor on the red CRT driver board. If it's the latter case (bad transistor), it can be fixed. If it's the picture tube, well, it's probably time to go shopping for a new TV.
Do you need more information? Do you want to fix it yourself? Do you have electronics knowledge and experience? If not, call a qualified electronic technician (TV repairman), and he can tell you if it's the picture tube or not.

IF (and only if) you are a competant electronic technician, CAREFULLY check and compare the voltage on the collector of the driver transistor on the 3 CRT boards. (The driver transistor is the large one, possibly connected to a heat sink.) The voltages shoud be somewhere around 140 to 160 volts. If the red one is significantly different from the green and blue ones, then it's probably the transistor. Unplug the set (and wait a bit), and check the transistor with a diode or transistor checker. If it checks bad, then you found a bad transistor. Go to NTE Electronic's website to find a replacement. If it checks OK, then you're probably looking at bad (shorted) red CRT.

Dec 12, 2009 | Hitachi 43FDX01B TV

1 Answer

NNC2000P - Microwave does not work but convection works


An IGBT is an insulated gate bipolar transistor - sort of a hybird between a bipolar transistor and a MOSFET.

These are the final output driver transistors in the high-voltage inverter.

If it stops after 7 seconds, it still has a problem with the inverter.

It's likely a bad transistor, an electrolytic capacitor with an internal short or bad ESR or altered value, bad connection on the inverter board, a shorted diode or blown resistor, or a bad connection in the wiring.

Reputable service centers will have a repair warranty, but it may only be 30-90 days.

Due to the lethal voltages used and produced in inverters, I do not recommend that an inexperienced person work on these.

You should use a Panasonic-authorized service center so they'll have the service manual and (hopefully) experience and training to repair inverters.

In the US, you can find an authorized Panasonic servicer here.

This sounds like a non-US model. If so, visit panasonic.net, find your home country, then find the service / support links.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Feb 13, 2009 | Panasonic NN-C994S Convection/Microwave...

Not finding what you are looking for?
RCA D52W20 52" Rear Projection HDTV-Ready Television Logo

Related Topics:

15 people viewed this question

Ask a Question

Usually answered in minutes!

Top RCA Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74468 Answers

matt martin
matt martin

Level 3 Expert

1213 Answers

Computer Repairing
Computer Repairing

Level 3 Expert

14641 Answers

Are you a RCA Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...