Picture is ok hissing sound in rf connectoin

Try with that...
http://www.filestube.com/3c4e959f7e53ba6703e9,g/PHILIPS-42PFL7932-LC420WU5-V2-CIRC.html

Symptom:
Sound but no picture.

Cure:
Master or Slave inverter is defective.
It can be that the driver IC is defective or MOSF
inverter transformers, or 470uF 35V C
Replace driver IC BD9897FS or MOSFET's.
996500046243 IC BD9897FS
996500046242 Mosfet FDD8447L
996500046241 Zener KDZ100V

i know you check speakers,head phones jack and audio output ic.they are all noproblem. then the problem is in micro processor(remote ic).please change that and hear sound in your tv. thank you.

sound is not coming but picture is ok in philips 21 RF vardan tv

It has been my experience with that model mitsubishi that the usual culprit is loss of vertical sweep. If the beams in the picture tubes stops moving up and down this is detected by the micro processor and the video is blanked, but the set is not shut down. The usual cause of loss of vertical sweep is bad solder connections on the deflection yokes or a failed vertical output IC.

I had a similar problem. After a nearby lightning strike I lost video to the TV. When the SA-HE100 source switch was set to DVD or TV I lost the TV picture. In my system configuration I send composite video (yellow jacks) to the SA-HE100 from the DVD player, VCR and satellite receiver. From the "TV Monitor Out" jack (yellow jack) the video goes to an RF modulator then is sent to the TV as RF channel 3. At first it seemed the modulator was defective but plugging in another identical modulator damaged the second unit also. This made me look at the amp as the culprit. Curiously, the amp would pass through VCR video without a problem but I didn't know it because of the damaged RF modulator. Whenever the amp source switch was set to DVD or TV the amp would put -4.75V DC on the "TV Monitor Out" jack thereby damaging the connected RF modulator. The repair is relatively simple. The only special skill required is you will need to be able to desolder a 14 pin DIP IC. The damaged component on my amp was IC364 mounted on the board that holds the yellow video jacks. The IC is a JRC 2279D, a 3 input/2 output video switch available from Digikey p/n NJM2279D-ND, $1.50 each.

first check  if it is in AV  mode.  if true then change it to TV mode.  problem will solve ...

  In rare cases  inside the TV  board  chroma ic may gone if there are  2 ic's.  
micro controller may gone if there is  only one ic...



thank u

verify your b+ voltage on collector of horizontal output transistor 7405 and if 130 volts is missing or way off go to power supply circuit and verify voltage on pin 14 of ic 7511 and if there is not approx 150 volts present should replace that ic and startup capacitor 2511 and opto isolator 7513. if 130 volts is present on collector of 7405 then scope signal on 7404 and if not clean signal replace micro processor

sounds like shorted convergance IC's
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

reset mirco by pressing with tv off. display , 5 volume up power on .then press 8 then enter.