Question about Philips Magnavox 27MS343S 27" TV

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My tv sound ok, crt high voltage ok,channel number display ok

But no display for picture. what reason,tell me

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  • 67 Answers

Check for a resistor rated around 220kohms somewhere around the flyback area. i have never worked on this model tv before so i cant give you an exact part number on the board but had the same problem with sharp tvs

Posted on Nov 21, 2008

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When tv is powered on tv only displaying channel number and sound -no raster. using video mode displays are ok. sound is also ok


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. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Dec 06, 2014 | Sharp Televison & Video

1 Answer

Sound ok but no picture


see the b. diagram and test the power supply ;transistor, fuse, filter, switch, c.breaker rectifier,IC regulator voltage.
measure the horizontal output =125vdc
all other circuit:12vdc
color:12vdc
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Oct 17, 2012 | JVC Televison & Video

1 Answer

Picture tube


what kind of display have, totally black or only a raster?. if you are watching a local channel then only a raster with sound, it could be a tuner problem. now if totally black screen you need to check if the flyback transformer has high voltage coming out at the anode cap. and then the tube has heater light. this case can be hand held with a trained technician if you don'y have an idea on how to deal with it just leave it to the tv technician for safety reason. however at least you have an idea what to expect if you decide to hire for somebody to fix.

Aug 11, 2012 | Zenith Televison & Video

1 Answer

Sound but NO picture


Hello ashleewith2e,

This sounds like a high voltage problem or a picture tube issue (burnt out filament). I would first determine if you had high voltage at the anode of the TV by using a high voltage probe. If you do not have high voltage then I would suspect the voltage doubler, the IHVT (Integrated High Voltage Transformer) or the Horizontal Output Transistor (I doubt this only because you don't have a power supply failure and I would expect this in a modern TV since the high voltage supply is tied to the low voltage supply), the more likely suspect is the voltage doubler. Second possibility I would check is the CRT socket board and CRT filament. Unplug the TV and with a multimeter set to read resistance check to see if the filament pins read a low resistance if so the filament is good. Plug the TV back in and turn it on and check the voltage on the CRT board and compare them to the schematic values. These two tests should localize the issue. Now, If you have a background in electronics, this should be no problem to do, however if you do not have a background in electronics, I would suggest that you have a qualified TV technician troubleshoot and repair this TV set.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Dec 01, 2008 | Sony FD Trinitron WEGA KV-36FS120 36" TV

1 Answer

Tv screen not work


No picture, FR406 ok
Check the video output amplifier stage for failure
Display dead rest of functions ok
Change transistor Q1701 on Timer operation board

Nov 24, 2007 | Sony FD Trinitron WEGA KV-32FS120 32" TV

2 Answers

No pictureq


maybe you have defective heater line tru the CRT board! check the heater line if have a 4.5 volts or 4.8 volts! can you see the back of picture tube!?! they lights coming out at the neck of the tube! if no light! you have defective heater supply!

Oct 16, 2007 | Orion1934 19" TV

1 Answer

Grundig Xentia - sound but no picture


in your tv is malfunctioning high voltage, the audio is generated without the help of high voltage sistem how happens commonly in many other tv

Aug 07, 2007 | Grundig GF70-600 TV

1 Answer

Tv has lost two outer sides of vision despite changing picture mode


That's either a high voltage problem, or a deflection problem. WARNING, CRT Based Televisions have potently life threatening voltages inside them, and should be serviced by trained personnel only. With that out of the way. According to http://www.repairhelper.com It's a capacitor failure Fault - Width and E/W correction fault Remedy - Replace R626 and C630 I don't have a manual so I can't tell you for sure what the resistor and capacitor do, or where they are located.

Dec 30, 2006 | Bush WS6671 28" TV

8 Answers

Tv has sound but no picture


Sounds like you have lost video somewhere in the video circuits. Possibly the picture tube could have gone bad or lost filiament voltage. You can check to see if you have high voltage by holding your bare arm close to the screen. The hairs will stand up if you have high voltage. Absence of high voltage will also cause a black screen,but the sound might not work either since on some sets the power for the sound is supplied from the same circuit as the high voltage. Stargazer

Jan 24, 2007 | RCA G36710 36" TV

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