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Check the Mosfets on the P0981 pcb this is the pcb that has the inputs and such.. not the power Supply board. Fets are mounted to the Heatsink under this pcb, but you can get to the pins as they come up thru the pcb . T11, T7, T4, T1 These have 3 terminals Check for shorts or reading the differ from one to the next.. These are Fets so From G to D and G to S shoudl be open. D to S will read some value as there is a Diode across it.. Also If these are bad the Gate Driver IC IC 11 or IC 3 might be the cause. Mine had two shorted FETS and the IC that drove them was bad. IC is IRS20955 Found some tech reports that show this ic was updated to IRS20957 due to issues.. So I updated both mine and replaced all 4 FETS. Good luck .
try to increase the volume up to maximum, if you can't hear any sound or even humming that means might be the speaker or the audio amplifier itself was the problem. if you have a knowledge in basic trouble shooting you can fix the problem. your first step unscrew and remove the back cover of your unit keep all the screw not to loss. then try to look broken speaker wire and then find the speaker check if their is a resistance.your second step by this time you need trouble shooting if you can use digital tester much better, you need to plug and power ON the TV try to find the amplifier IC sometimes factory used TDA2009. and then you need to check the pin of that particular IC it require supply voltage.if voltage is present then the IC is in normal condition might be the input audio signal was the problem check defective transistor, open resistor or even signal diode going to the amplifier IC.all you need is only concentrate in amplifying section to fix the problem.
there is problem with your power board fet or drive ic faulty.
Check voltage some one missing.
like 12v,32v,5v,24v dc.
Which voltage missing only same line.
Most Yamaha organs used IC divider technology. The first step would be to determine
whether the power supply is putting out the correct voltages. A quick
check with a signal tracer would rule out problems with the IC
which is the tonal source for the instrument. It is also possible a
buss wire has fallen...or any wire for that matter has come undone.
Get a bright light and carefully visualize all the connections. A
loose hanging wire or connector would be the tip off. Without more
information, this is the best I can offer.
If the organ is still under the warranty, contact Yamaha for free repair.
Over Current Protection
Pin 1 of IC951 is also the Over Current Protect input.
The internal FET.s ground return is at pin 2 of
the IC. The voltage drop across R955 and R956
indicates the FET.s current, and is coupled through
R953 to pin 1 of the IC. The Over Current Protect
circuit is activated if the voltage at pin 1 of the IC
exceeds 1.35 volts.
Stabilization and rough regulation are provided by
feedback from pin 3 of T951 to pin 1 of the IC. Fine
regulation feedback is from a secondary supply,
through the Photo Coupler, PC951, to pin 1 of IC951.
Its possible that Diode D953 is leaky allowing the voltage to rise on pin 1 of the IC
The 8V at pin 36 won't show unless there is oscillation, the primary voltage pin is pin 10, 8v. Don't mind me asking, you have checked the B+, right? Because the blinking LED is often because of power supply problems. And if that's okay, desolder the horizontal driver output legs and connect an LED to find if it is oscillating, if it does, forget the ic part and move on with the FBT and things. Good luck.
I HAVE INTEL 845GVSR MOTHERBOARD & 2.4 GHZ PROCESSOR & 1 GB DDR RAM & AND I INSTALLED WINDOW VISTA HOME BASIC PREMIUM 32 BIT & AND MY VIDEO,LAN,USB DRIVER DOES NOT SUPPORT WIN VISTA & WHEN I BOOT THE SYSTEM IT SHOWS NOTHING
PLZ GIVE ME PROPER SUGGESTION WHAT CAN DO FOR MY VIDEO,LAN,USB DRIVERS
Not to be trite, but if you have to ask, there isn't enough room on this page to explain.
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