Re: Sharp Aquos LC-40F22E - Not switching on!
The ones on the inverter or the power board? The power board does seem intermittent?
I never found a wiring diagram for the inverter board during my searches for information.
How would I go about testing the transformers on the inverter please? Other issue is it states 1000V on the inverter and my DMM only goes to 600V. Any chance you could do a markup for me on the photo to show what goes where on the transformer input and output please?
Rhothgar
Senior Member
Last Activity: 03-23-2020, 04:06 AM
Joined: 05-29-2015
Location: Nottinghamshire
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Re: Sharp Aquos LC-40F22E - Not switching on!
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[url=https://ibb.co/qyTy6WQ][/url]Re: Sharp Aquos LC-40F22E - Not switching on!
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[url=https://ibb.co/qyTy6WQ][/url]Re: Sharp Aquos LC-40F22E - Not switching on!
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[url=https://ibb.co/bbx6DPF][/url]...Leave a comment:
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Sharp Aquos LC-40F22E - Not switching on!
Hi
Been scratching my head on this for a couple of weeks now.
Neighbour was throwing TV out and I said I'd have a look at it. He says I can have it if I can get it working.
He tried changing capacitors on power board and ended up buying a replacement power board. No joy!
So the symptoms are that there is NO Standby LED when the unit is powered. The control board beeps when the buttons are pressed. I've tried a service reset but couldn't find exact reset technique for this TV anywhere.
If I unplug the inverter board, the... -
Re: Hotpoint FFA47X Fridge Freezer
Underside of circuit board when installed...Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
Yes the fuse in the plug is fine.
The freezer still gets cold but to -30 deg C And I did measure 240V across two pads a few posts back. Checked it anyway and it is OK.
EEPROM on far left next to buzzer on top of board. GND and Vcc pins face out.
Uploaded photo of u/s board too so you can see roughly how much of the board sticks out.Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
Pad 7 shows continuity to the big solder reservoir pad at the rear of the triac where I soldered the jump wire to so I would be able to access that. Pad 2 continuity stops at triac leg obviously because, I assume, it's not powered and therefore not switched until power is applied.Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
Sadly, it's impossible to get in with my probes!
I know it won't rule out a problem with the new truacs I have soldered in but from this photo is someone able to tell me if pad 2 traces to any of the big solder reservoirs once triacs are active ( or do the fans cause them to become live when they get a signal )?
I'm obviously thinking how I can check power to the nearest component connected to any trace that needs checking given that the U/s of PCB is tight to fridge but protrudes slightly....Last edited by Rhothgar; 07-11-2015, 02:41 AM.Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
I'm not qualified to have an opinion. Take a look at post 183. I was beginning to think they were wrong.
I had no idea what those numbers were for on that diagram but how do you? There are 11 pads in that area of the PCB so how can we be sure?
I wish I could strip the casing back!...Last edited by Rhothgar; 07-11-2015, 02:07 AM.Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
Is that the 400V radial cap or one of the Epcos caps?...Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
Aha! So trace 2 is the live and 7-11 are neutral. Opposite to what those previous so-called experts who I sent the board to thought.
Can you explain to me why if I have the probe on trace 2 and probes 7-11, I only get full voltage on trace 7?
Are you referring to the traces on my last photo, stj?Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
Also I would like to check Q17 ACS108 triac which I believe is a TO-92 format ( from data sheet) but wondered if I use EEPROM ground and then proved each leg would it give me a voltage reading or, with EEPROM running around 5V, would it blow something to smithereens again if I probe a leg of a component which I believe should be getting 240VAC.
I am guessing something special must happen with a DIGITAL VMM because the probe leads are thin and unable to take 600Vac so I am guessing the current is somehow reduced inside meter? I suppose...Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
I was just worried about probing a live circuit and blowing something on the PCB again.
I am trying to work out unsuccessfully but trying to learn as I go along which traces should have a live because I cannot see wiring in head panel.
The big black rectangular component on the PCB marked J1 - the top left lead ( from last photo) on the u/s of PCB connects to trace 1 but when I meter trace 1 it's not getting 240VAC and I don't understand why.
I've looked at legs on ACS108 data sheet and do not understand...Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
I tested the first 11 spades on the fridge.
They relate to the photo uploaded.
I assumed GND or Neutral was the far right trace at the top of the photo.
The 7th trace in from the left is the only one that measured 240VAC....Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
i need to know how to find an earth (GND) or Neutral on the appliance ( not the house) because surely if I probe the wrong terminals because J cannot see the wires on the fridge then I will blow something else up and perhaps not the triacs this time hence asking the questions in previous thread.
Crikey. The wiring in the house is still on a Bakerlite panel. I had a wire between the garage and the house melt a couple of months ago.
EDIT: Just reading an article on a website called the circuit detective and...Last edited by Rhothgar; 07-10-2015, 12:49 AM.Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
I thought it prevented a live going to earth through me!
So if I probe a live wire with bare feet and no probe to neutral I would not get a shock? Surely I would.
I cannot see a way of removing any panels. There are screws but I don't think it's meant to be serviced.
It looks as though the case is built, wired, internals out in and then expanding foam to fill the voids between fridge compartment and metal casing....Last edited by Rhothgar; 07-09-2015, 03:29 PM.Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
Oh! Sorry. Sounds hopeful that 2000 Ohms is not unexpected.
This is where it would be useful if I had a variable voltage power supply!
I cannot see any wires because the female spades are in a plastic connector block behind he fridge top panel.
On the first photos I uploaded, the N and L were marked by a testing company so I would assume they are correct.
Being high voltage, one should never assume so to play safe I have a few questions.
1) if I am wearing rubber wellies, can...Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
On the right of the photo is the 8 leads of the EEPROM.
The bottom left of the 8 pins is Vcc and bottom right is GND.
If I measure from Vcc to pin above I get 11000+ Ohms. No idea if this is right but logic says not.
When I measure to pass North of the 3 no. 103 resistors in top left of photo I get 10,000 Ohms i.e. the value of the resistor. When I measure to the pad nearest to the south of the middle 103 I get 1915 Ohms. That pad goes through the south of the 103 to its right (103 immediately to...Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
I think it is because it is warm after it's been left on.
Tell me how to safely probe the live and I will check them on the fridge with board out.
The earliest photos show N and L marked but you know me by now I am wary of just probing.
Another thing is and I will upload a photo in a minute, I am getting high resistance to certain pins in locale and then 10 on other side of some 103 resistors.
To me, it is looking like the resistance is in the chip and therefore...Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
Right! When on continuity, it beeps momentarily and then stops. Remove proves, wait 10 seconds, do it again, short beep then stops.
Turned scale up to max and then down onto 2K scale. It reads 1.958 so 1958 Ohms. Obviously this must mean a component is blown somewhere.
Perhaps the chip itself?
I saw a video on the net somewhere about the LeakSeeker 88 which said that, IIRC, the closer you get to the fault the higher the resistance becomes? Is is correct?
I will try to...Leave a comment:
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Re: Hotpoint FFA47X Fridge Freezer
I've got plenty spares for the triacs stj!!!
The EEPROM is showing 0.231 volts in 20VDC scale and same on 2VDC scale so it looks like it is not switching the chip on.
Do I need to take any readings from any other pins on the EEPROM or just the Vcc and GND?Leave a comment:
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