Question about Panasonic TX-42PT10 42" TV

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Please Help - Set "Dead" Euro 7 vp chassis

Hi, Television died the other day most unexpected, Symptoms: 1. On switching on there was a high pitched squealling with a flickering screen then auto switch off after 10-20 sec.s standby light flashed three times. 2. On switching on now there is a clicking noise which lasts for 10 sec.s then shut down. no squealling noise or start up. looked at main fuse - ok looked at "P" board -seemed ok looked at "A" board- solder on R9611 thru R9615 seemed a bit rough but checked out with meter, Would really appreciate some direction on next course of action, Can you help regards jon

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Re: Please Help - Set "Dead" Euro 7 vp chassis

This sounds like a line timebase failure. The line timebase works at about 15 thousand cycles per second (15KHz) which may be audible to some people due to the iron-ferrite materials used (magnetostrictive). The line output transformer is highly stressed and also has the rectifier diodes in the outside if the windings. It is all very well insulated to guard against moisture and dust but if it breaks down due to the high voltages (25Kv) the arc produced makes this squealing noise, and of course it burns out, and breaks down. This may not blow the fuse if there is not a short circuit. So get an engineer if you are not sure about changing the line output transformer.

Posted on Oct 16, 2006

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Sansui CRT SV29276. Set is dead and set in protection. B is high (+-180) and pulsating. Secondary power supply was checked and is fine. What else could be causing the problem? Any help will be much ap

Check the horizontal scan output section circuit, for any loose solder terminals first. Re-solder all the suspected solder terminals, by applying a little more solder to each terminals, and check. Before doing this, replace the electrolytic capacitor [connected across the secondary B+ line]. If these do not help you, the SMPS circuit has the fault. Contact any service technician.
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Sound level goes to high by itself.

your remort is short
thats y this problem occures take ur remot your nearest electonics shop tell him i want a same model no of remot
they will give u same remort & your problem will solved

or do one ting open your remot clen form the dust see your key pad is damged so if get a pad then replace the pad

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Hi, I had a problem with my Sony CRT television.

The faint background lines are vertical flyback lines. Start your diagnosis by turning the brightness and contrast controls to minimum and view the screen in a darkened room. If you can now see a raster with horizontal lines visible then it is likely that the tubes A1 screen voltage is excessive. The screen voltage is usually within the range of 400v to 600v. Adjustment for this is often part of the flyback transformer. Check all high value resistors
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1 Answer

Hi there, do you have the schematics for the Panasonic CT-27sf37b. This TV won't power up but making a high pitch sound near the thermistor area. Thanks.

Hi Richard,

First of all thank you for contacting regarding your TV problem.

You have mentioned that you can hear a high pitch near the thermistor area and the TV won't power up. I've saw also in another link that you already replaced the thermistor but the symptoms still persist. You stated that the thermister heats up, that is normal and not an issue in this kind of symptoms. You can power up the unit even without the thermistor in the board and check if the high pitch will gone or not. But I've suspected that the symptoms will remain the same because the pitch came from the chopper transformer.

I've encountered this kind of symptoms not only on panasonic CRT TV's but almost in all brands. And the major caused of fault is the faulty electrolytic capacitor in the Voltage regulator IC. Your unit used STRF6524 (mounted on the aluminum heat sink) as voltage regulator IC and it has an electrolytic capacitor on its circuitry. I would advice you to replaced it to resolve the issue. The largest electrolytic capacitor is not the suspect here (don't replaced it).

Also check for bad solder joints around the regulator IC. Cracked, cold, dried solder can produced that kind of symptoms. It is hard to spot, you must used magnifying glass and work in the brightest area or much better to re-solder the suspected bad solder joints.

I have various of Panasonic schematic diagram but most of them is a LCD and Plasma TV. I don't have this model no. but please check the chassis no. of your unit and I will try again to find it on my supplier to give it to you for free as much as possible because I've saw it HERE but I don't think the price is reasonable.

Please let me know if you need further assistance.

Again, thank you and have a nice day!

Kind Regards,


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That sounds like you have a power supply fault.
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I dont think your problems in the degussing my friend. Sounds like the sets doing whats its supose to when theres a power supply overload??? we really need more info on this one please.

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