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Calcom tv chassis complaint

Iam a tv technition .i got a calcom clock tv chassis complaint.its horizontal section oscillating three times and staying on standby position. can you tell any chances on this complaint.i changed the UOC also (TDA 12135) but it is in same possition, expecting your valuable replay.thankyou

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6 Suggested Answers

6ya6ya
  • 2 Answers

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

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Posted on Jan 02, 2017

hardrocko
  • 1476 Answers

SOURCE: Unit power up have sound but no picture.

Check the damper diode and the protection resistor in the High Voltage circuit. Good Luck.

Posted on Jun 19, 2007

rey jr
  • 149 Answers

SOURCE: Sanyo tv chassis 2111 Series EB5-W Dead

hi there, light flashes means a shorted parts at the power supply and mostly at the horrizontal sec,, it may need to check-up and repair., do some testing and check-up at the horrizontal section. ty

Posted on Mar 10, 2008

Rammsteins
  • 300 Answers

SOURCE: on replay black horizontal line

Hi!
Probably the video head has to be cleaned - you should give it to a local camera service center. I don't recommend using the cleaning tapes.

Hope this helps!

Tom

Posted on Jul 29, 2009

ginko
  • 19396 Answers

SOURCE: T.V. Engineer working on a LG 3000 model: When you

Before replacing the main board, the PSU should have been tested. This TVs PSU provides power on different voltages, and each voltage is controlled through a low DC control line from main board. A defective PSU may turn off and restart by itself.

In real word I repair many LCD TVs. I do not get tired of repeating that LCD TVs are very different from home computers. Repairing by simply board swapping does not work. Although this units have few parts, the working process of the TV does not allow identifying reasons of faults from symptoms (with a PC you can often tell), parts are expensive, and testing is always necessary.

In your case for example the problem is likely a faulty PSU, but a bad grounding caused by missing screw may also cause the problem. The PSU, which is likely culprit, must be tested by jumping the control lines and reading volts to main board. This is made more difficult by the fact that the TV is forcing shut down, and turning volts off continuously.

Posted on Sep 13, 2010

  • 1 Answer

SOURCE: ic used in which section of philips TV kit

tv set no sound coming.i replce sound out put ic but not hasbeen coming .i think 9370/1665 ic in side a/f out put line is gone i have a this curcuit daigarm not avilable so pl help this point

Posted on Nov 02, 2010

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1 Answer

Iam a technition of tvs my sansui tv model 294 isx the fualt is when turn on tv h line com tv turn of again


Being a technician, why couldn't you understand that the fault to your TV is with vertical sweep failure? Check its vertical output section circuit for any loose solder terminals, or damaged component/s.

Aug 20, 2013 | Televison & Video

2 Answers

No power


Hi
the noise you hear is the RELAY circuit. the relay try to power up but they cant, because the oscillation circuit is defective thats why your power is not coming out! the main problem is the hot side section, the problem is the oscillation circuit.

Nov 06, 2007 | Samsung TXN3245FP 32" TV

1 Answer

No picture but has sound


The horizontal output and horizontal oscilator section to your TV should be troubleshooted. Your complaint sounds that, the fault is with its Line Output Transformer. Seek tech assistance.

Jun 24, 2012 | Televison & Video

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Calcom philips component tv kit having vertical line problem


iam fixed calaom tv kit in toshiba 21 flat tv there is a problem in picture vertical height is less what can ido

Jun 03, 2012 | Televison & Video

1 Answer

On_Off light blinks three times but power will not come on.


Hello
Your tVs horizontal output and oscillator has some trouble with it. When the power supply gets ON, the horizontal frequency that drives the horzontal output section won't generate the horizontal frequency, that output section wont' work, the main system control microcomputer IC will sense this situation, and give shut off signal to the power supply. That is happening now with your tV.
A through checking on the main board should be done to detect this fault. you must have sound knowledge in electronics, how the TV works. Also must have all testing equipments with you including a high quality digital multimeter. Normally this fault occurs due the main chorma-video jungle IC. But before replacing it, you have to check all other components in it. Some loose soldering contacts may also make this problem.
If you have the ability and skill, Inform me. I'll assist you. OK.

Jun 27, 2011 | RCA 32F530T 32" TV

1 Answer

We replaced the transformer for our RCA F27650. It was sparking and now it is not, but now the screen won't turn on. It is just black. We hookd all the wires up like they were. we can hear sound, but...


Hello
Along with the flyback transofrmer, its horizontal output transistor also must be replaced. I don't know whether you have replaced it or not. If not, replace it too. It can be located very near to the flyback transformer, a three terminal component, black in colour, usually screwed to a metal heatsink. Then switch on the TV and measure the video output voltage at the video output card pluged directly to the picture tube neck. The collector of the video aoutput transistors must come around 145VDC. If it also is there, advance the screen control on the flyback transformer to get a raster. If that voltage is not there, it means that the flyback transformer is not working, and horizontal oscillator stage should be checked for oscillation, check the lined drive transformer for its primary winding open, Check the entire horizontal oscillator section. The collector point of the line drive transistor, the transistor that drives the line drive transformer, a small transformer soldered diretly to the printed circuit board; should be checked with frequency meter. The frequency at that point should come around 15525HZ approx: OK.

Mar 19, 2011 | RCA F27650 27" TV

1 Answer

I have a sony trinitron puchased 2001 after 911 standby light flashes constantly picture flashes off and on


Hello
Complete loss of horizontal oscillation and output is the trouble. To get it repaired you have to open your TV, Just look the horizontal driver transformer, a small transformer fitted on the main board very near to the line output transformer [LOT] for winding opened. If its primary winding gets opend, even though the horizontal oscillator section works, the pulses will not reach the horizontal output trnasistor, which drive the above said LOT, and the fault you describes will occur. Check the main secondary regulated supply voltage [140VDC] also. If this voltage is missing, check the reason and follo the supply rail print from the SMPS power supply reguator section.
Check the low voltage regulator IC, usually 7808 or 7812, which can be located on the main board, which supplies 8VDC or 12VDC to the ICs on the main board. Anyway, there is no horizontal output fuction in your tV. and try to find it. If you wants furthermore assistance, feel free to get me through Fixya. OK.

Jan 01, 2011 | Sony FD Trinitron WEGA KV-34HS420 34" TV

1 Answer

HORIZONTAL HOLD


Hello INDIII,

The answer is yes, if all you have to do is to adjust the horizontal hold control (usually located on the back of the TV)

The answer is no (with caveat) if you have to open up the set. This problem occurs when the horizontal oscillator is drifting off its set frequency of 15,750 Hz This can be caused by a component or components changing in value, or the problem could be caused by the loss of or decrease in the amplitude of the horizontal sync pluses within the video signal. Such a loss of amplitude can take place from the output of the Video detector to the Horizontal mixer stage (uses the Video pluses and the Horizontal oscillator to sync the picture). This means that you will be working around a hazardous section of your TV.

The caveat is if you have a background in electronics and you have the proper equipment.
1) schematic diagram of the TV to see where TV test-points are
2) multimeter to measure DC voltages at test points
3) oscilloscope to view waveform patterns in the horzontal section of the TV
4) Signal generator to produce a know good signal into the TV set.
5) Isolation Transformer to connect the TV power plug to to isolate the Tv ground from earth ground and allow proper connectivity for test equipment (plug the unit under test into the isolation transformer and the test equipment into the wall outlet.)

I hope this answers your question,
Thank you,
Shuttle83

Nov 26, 2007 | Televison & Video

1 Answer

Tv power problem


It sounds like you have an integrated power supply issue. This type of supply truns on the horizontal oscillator which provides excitation to the Horizontal Output stage which in turn work with the HV section of the TV the extra LV levels are supplied by this interaction. That tsss noise might be the oscillator trying to work or the startup circuit trying to work. I would check the Horizontal and HV sections for failed components.

Sep 04, 2007 | Toshiba MV13L3 13 in. TV/VCR Combo

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