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Re: Philips 50PP9202 No Sound/Picture
Its possible that the opto ic went south at the same time you had the convergence problems. This is fairly common for these sets. Check to see if they have a chip kit on www.magnavaoxhelp.com for your model.
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Your flyback has failed most likely...bad new is they are nearly impossible to find, This is a known issue on most of the models below. The site Tv Repair Kits can sometimes get replacements - but its not often.
This repair kit is known to work on Magnavox TV sets with the following Chassis/Model Numbers.
Its a little hard to diagnose over the computer. I assume there is no sound from the amp EVER. I assume you have tried other sources. I assume the unit worked OK until the IC blew. I assume you replaced the IC yourself?
Often, parts with the IC also fail. There maybe fuses that look just like little resistors along with the IC. They might be blown. There are parts in the circuit to test if there are speaker problems called power resistors. These will frequently open circuit when the IC Blows - you won't be able to see anything visually. If your stereo normally makes a 'Click' sound just before the sound comes on, and now there is no click, this indicates the repair of the IC is not complete yet - find the blown part.
Your original problem was/is an "opto" IC (chip),which causes the power supply to regulate low when it fails. It is a 6 or 8 pin chip. Sounds as if maybe more has failed now. Switch mode power supplies are not for the faint of heart,or DIY. I recommend having it troubleshot by a tech.
1) Faulty Lamp 2) Vertical/Horizontal Output IC 3) A Shorted IC driver 4) Blown fuse 5) Open resistors around the fuse
Keep all of these in mind and I would test the IC's first with a multimeter,IC's are transistors,usually having 3 legs and screwed into a heat sink,if they read 0 they are shorted. Also if you find something has gone bad,look around the component to see if there is an underlying problem as it will be frustrating and more expensive to find out after the first replacement.
Requires convergence amp IC replacement ( two) and check
resistors in vicinity of IC's....fairly technical repair....Please read
some of my convergence solutions and let me know if you want
step by step instructions............................T.
This is an indication the the red convergence amplifier has goone bad you will need to replace the convergence correction modules. Now before replacing these you may want to make sure that the bias resistors and the zener diodes are ok. The convergence ICs are part number STK329-110 or STK329-150.
I would suggest that you get a schematic and equipment to make the needed tests, or take the set to a shop to replace the bad components.
I have the 51 inch of this model and I have found that usually it give you some indication before going completely out. Like color problems, sound, or just video disappearing. Most of the time it will be the convergence amps going bad, but you should have seen some color distortion. If not then it could be the vertical output. TDA8177 needs replacing and check caps around and diode, If not this then look for open fuse in HV line to crt's. Also power supply fuse like 1900, 2004, 1300, etc.