Maybe. Check all voltage regulators, power supplies on main board.
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I can get the relay to click when i put 3.3v on both pcons1&2, This then gives me a nice speaker pop like a normal tv would do and i get 24v going to the inverters, but no lights yet.
Checked all diodes and transistors on the mainboard but all seem ok.
Do NOT touch heatsinks when testing for voltages as they may be LIVE!
If screen is good then (not cracked) replace main board I guess... Or hunt down a set with a cracked LCD.
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Hmm, that is strange, but try using a 1kohm resistor instead between 3.3V and BLON/INV ON.
If that does not work you will have to break out the wire from the inverter and feed 3.3V in that way.
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Just remember one thing about trigerring the PS_ON, BL_ON, these signals are generated by the main board, the output are from the Collector of the transistors on the main board that is normally on so the output will be low until the micro controller turns off the transistors so that the transistors will switched off causing the signals to go high. If the transistors are on, when yoy try to jump the PS_ON or BL_ON Pin, nothing will happen since the transistors are on (stay in LOW state). You should disconnect the BL_ON, PS_ON lines that go back to the main board before using the resistor to force on the inverter and the power supply.
I have got the screen to come on by jumping pcon1, pcon2, inv_on and inv_brt, all whilst connected to the main board. The screen lit up but had lines down it, they started from about halfway down the screen then to the bottom of the screen, dont think it it tab bond issue as it wasnt all the way down the screen.
Here is some pics of the mainboard, in the service manual it says BU5V goes to 2 voltage regs, a 3.3v and 1.8v reg but i cant find them to test them?
Attached Files
Do NOT touch heatsinks when testing for voltages as they may be LIVE!
Sounds more like a T-con not getting proper power or main board crashing -- may be quite normal... I have seen weird patterns before when getting screen to light up with main board dead.
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I have never seen a bad Sharp regulator, but I would not rule it out.
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Test all pins & list part number... test relative to chassis of TV with TV plugged in.
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Also there is a 5 pin smd too, it is marked with ZG6F35, google doesnt help with that one.
I will give readings anyway,
Location, ic1701
pin 1 = 3.73v
pin 2 = 5.19v
pin 3 = 0.00v
pin 4 = 0.00v
pin 5 = starts off at 1.70v ish then quickly drops to 0.46v, it does that every I i touch it with the probe, its like the probe is putting a drain on it?
rs232 lead is no good, the link you sent me says that it only works on a tv that switches on
Do NOT touch heatsinks when testing for voltages as they may be LIVE!
Pin #1 is input.
Pin #2 is enable control for output (>2V, output on)
Pin #3 is output.
Pin #4 is adjustment terminal (should be 2.64V, relative to GROUND)
Pin #5 is ground.
For other regulator, the readings seem odd. Picture?
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Probably not a regulator.
I think firmware may be corrupt, no reset will cure that. The "I2C" method may be necessary...
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It looks like the Sharp board has custom IC on it, so probably not, plus you would need new firmware. Right now I think you should look for a new main board.
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