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I'm servicing one colord tv ,the problem is low voltages instead of 190 volts i only got 70 volts on the horezontal output

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Hi. It will be easier to help you if you tell us the make & model of your tv set.

Posted on Sep 21, 2007

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Telefunken tv mr701 has primary voltage of 338v instead of 300v,and the secondary voltages are too low

SMPS section circuit fault. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.

Apr 03, 2016 | Standard (CRT) Televisions

1 Answer


Check all the voltages at its video output section circuit. Refer its repair manual.

Apr 01, 2013 | Standard (CRT) Televisions

1 Answer

My Wega KV-SW29M80 TV's Picture comes reddish, i Open the back cover of TV & Solder the transistors legs, there is no change in picture. Plz. give the solution

Check the voltages that comes to that board from the main board. Check all R-G-B input voltages. Replace the Red output transistor and its load resistor. Voltage to red cathode of picture tube is low now. Check its reason. Try this link and see whether it help you.
If you are not familiar with electronics, do not attempt to repair! Whether you suffer fatal electrical shock! Instead, contact the nearest service center!

Jan 17, 2013 | Standard (CRT) Televisions

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I have a JVC model available27980 that absolutely will not power up. I checked the fuse inside, any ideas?

Replace the SMPS (switch mode power supply) STRF6626 regulator. This is the part which supplies multiple voltages which ranges from 157 V to as low as 16 V. Any one of these voltages could be disrupted. So instead of trying to repair it, sensible thing would be to replace it.

Nov 30, 2010 | JVC AV-32850 TV

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The color sometimes bleeds and takes over the whole picture. I have to change channels to ge it back to normal - it happens on any channel - none in particular - it is only 4 years old

You are reporting about color "spreading" I thinks. That is colour spred like taills along with picture. Red colour will show it more. There are 2 main couses for this fault. The first one is picture tube aged. The second one is low video output drive voltage. As your TV is new [I can say as it is only four yerars old], the second stated may be the fault.
Check the video output supply voltage. This voltage point can be located at the base card [a square or rectangular printed circuit board pluged into the neck of the picture tube]. It should be above 250VDC. If it is there come to the Red_Blue_Green cathode of the picture tube, [they are all also in the base card itsef]. All this voltages are almost equal to each other, provided 2 or 3 volts difference is normal. If any of them is found too low than normal, check the related videou output transistor. Check the electrolytic capacitor [usually 10MFD or so, 450v] connected to the video output voltage supply rail, and normally can be located at the base card itself. Ok
Keep children away from you, when you open the TV. Be caucious, as 25KVDC [25,000VDC] points are there inside your tv. Keep an adult beside you as a precaution. Never touch any internal part of the tv while it is switched on. Plug it out from the mains socket before doing any componet replacement, except for voltage measurements. Do wear a plastic or rubber footware when you work, and never use a metal chair.

Oct 20, 2010 | Sony KD-32FS170 32" TV

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Does not power up, red light next to on/off button just flashes. I rebooted the tv and it still has the same problem.

Some of the secondary voltages [low voltages of 12V and 8V], either one among the said is missing inside the circuitboard of your TV. It may be due to a component [Regulator] mistake, or loose sodering joints. You just give a mild hit with your palm, on the cabin of the TV while it stops. Do not hit it with any hard material. Use your palm only for this. If Tv comes alive again; it means that there is a loose contact inside the main board of the TV. Just find the exact point, and resolder it. If this doesn't help, check for the low tension voltages. As the red light flashes, means 5V power supply inside your TV is ok. Check the other two and the main supply rail, normally 125VDC, and related componets fitted with it. There may have a small value resistor in series with this power supply rail to LOT [usually less than 2 Ohms or so]. It will generate a small amount of heat while working. Check its sldering contact also for loose contact.

Oct 18, 2010 | Toshiba 32HFX71 32" TV

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The standby light flashes and the tv will not come on

check the power supply, its not giving out the required voltage output. if you cant repair a tv plse take it to a workshop, ask a technician to make sure that he checks the following components.
power diodes and transistor, fusable resistors around the power supply, and zener diodes.
he should make sure that an ht of 95-110 volts appears on the line transformer. later a transformer will produce various voltages to trigger other voltages to open up your tv. thanks

Mar 26, 2010 | Sony FD Trinitron WEGA KV-34HS420 34" TV

1 Answer

Avr problem the voltage of horezontal out 70 volt

check the capacitor in power supply area, dry capacitor can cause this problem.

Jun 11, 2009 | Standard (CRT) Televisions

1 Answer

Will not turn on.

  • proceed as given after your power supply is ok (your statement)
  • isolate power supply from h/output stage.
  • check diodes & capacitors connected with flyback transformer.
  • check for print short.
  • ckeck h/output transistor.
  • connect supply to h/output stage.
  • put on the set.
  • hope this will help.
  • good luck

still there is a drop in voltage then your fly back transformer faulty.


Oct 12, 2007 | RCA F32450 32" TV

1 Answer

Jvc tv

You need to check the horizontal output transistor first for a short,ift he transistor is good check the diodes and low value resistors of the secondary of the flyback(output trasformer),if all those are ok check the crt board,it has low value resistor for the g2 voltage,if ok you need to go back to power supply and check for a short from each one of the diodes to ground for a posiblwe short.Be careful when measuring voltages and use the correct ground.

Oct 01, 2006 | JVC AV-36F702 36" TV

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