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What is the value of r812 on the back side of pcb, I cannot found the value,it is open

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Posted on Apr 23, 2015

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Why won't the compressor won't kick off


sounds to me like you have to change your " room and coil " sensors..they are thermistors that work together to communicate with the pcb and tell the compressor when to turn off. if you can use a multimeter, check the ohmic value(s) they supposed to be between 4k - 10k. with the meter attached warm the thermistors by rubbing them between your fingers and the ohmic values should change.the room sensor can be found on the evaporator coil when you remove the face cover you will see it, the coil sensor will be found on either right or left side of the evaporator inside a piece of tubing. sometimes there is only a room sensor...hope this helps

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1 Answer

No power


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 .

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1 Answer

Error E354-0002 ir 8500


Error E354 in Canon iR 2016
error e354 code appear when you replace PCB controller board.
Please note. Before replace your PCB board with other one.
Pull out a small (FRAM COUNTER) chip from your old PCB board you can found it right side of the PCB board near a battery cell the chip attached with screw open screw and pull it out and attached it with your new PCB board .install your PCB board in the machine and turn on power error e354 will go off.

Aug 27, 2011 | Canon imageRUNNER 8500 Copier

1 Answer

I have a Samsung LCD TV and it won't turn on


A common problem with samsung flat panel tv's is that the capacitors on the power supply fail.
You will need to remove the back and check the power supply pcb for puffed caps. To do this you will need to lay the tv face down on a cushioned surface and remove all the screws that secure the back of the tv. You will need a surface large enough to support the whole tv. This is to protect the panel. DO NOT place tv on surface where the front of the tv is not supported by the frame.

Remove the back of the tv and check for puffed caps on the power supply pcb. This is the board that the power cord is attached to.

If there are any puffed caps, you will need to replace them with equal or slightly higher valued caps.The value ratings are printed on the capacitors in mfd and voltage.

You will need a soldering iron to remove and replace them.

After reinstalling the power supply and before you put the back on, hook up a power cord to the tv and try turning it on. If you see a backlight come on, the tv is working. Try hitting the meny button and see if you have an on screen display. If you do put the back cover back on.

If tv doesn't power up, then the power supply pcb is probably bad. Try checking the voltage outputs from the connectors on the side of the pcb. Use a digital multimeter, connecting black lead to chassis ground and read lead to check voltage on the pins of the connectors. There should be voltage levels printed next to the connector on the pcb. Let me know if this helps you.

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1 Answer

I have 20 inches tv there is a sound but no picture,it so dark picture


Since you say dark picture visible, then : Brightness control setting!

Check the resistors on the neck PCB. If you find the resistance value of these resistors high, replace them.

If No EHT is found then also there won't be a picture visibility.

1. Open the back cover and see whether you can observe a faint filament glow in the picture tube neck, close to the picture tube socket.
If there is no glow E H T circuit failure.

2. If the glow is observed check picture tube grid voltages grid no. 2. as said above.

( the points referred above are all for technical people)

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1 Answer

Refrigerator not cooling


defrost system is not working. fault can be in several areas as follows
defrost element open circuit or the thermal fuse in series with element
defrost sensor wrong value
fault with main pcb or defrost timer if not electronically driven

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1 Answer

60" Mitsubishi Problems


1. NO VIDEO, BUT HAS VIDEO WITH PIP ON. CHECK C763 (1UF 50V) ON THE BASE OF Q715, LOCATED ON THE UCOM-PCB. 2. NO MAIN VIDEO, THERE IS VIDEO IN PIP ON EXT1 AND EXT2:-CHECK FOR 1VPP OF LUMINANCE ON PIN 1 OF IC7000, IF MISSING OR LOW CHECK THE VALUE OF C7001 (4.7UF 35V), LOCATED ON THE PIP-PCB. THIS CAP MAY LEAK ELECTROLYTE ONTO THE BOARD AND OPENED A FEED THROUGH IN THE PATH BETWEEN C7001 POSITIVE LEAD AND THE EMITTER OF Q7003 OR CAUSE INTERMITTENT COLOR. PART # 181P504090. (CHECK ALL 'SMD' ELECTROLYTICS AND TRACES ON PIP) 3. NO MAIN OR PIP VIDEO, CHECK C7014, 47 UFD 16V ON THE PIP PCB. PART # 181P502060 4. CHECK FOR 7.2V DC ON THE BASE OF Q7003, IF LOW OR MISSING. CHECK THE VALUE OF R7002 (150 OHM 1/10W).LOCATED ON THE PIP-PWB. PART # 103P401050 5. SUSPECT R2045/R2048 (6.8 OHM 3W) FOR OPEN/RAISED VALUE. LOCATED ON PCB-SIGNAL AT 5V REGULATOR IC2003 PIN 5.

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1 Answer

Mitsubishi television


1. NO VIDEO, BUT HAS VIDEO WITH PIP ON. CHECK C763 (1UF 50V) ON THE BASE OF Q715, LOCATED ON THE UCOM-PCB. 2. NO MAIN VIDEO, THERE IS VIDEO IN PIP ON EXT1 AND EXT2:-CHECK FOR 1VPP OF LUMINANCE ON PIN 1 OF IC7000, IF MISSING OR LOW CHECK THE VALUE OF C7001 (4.7UF 35V), LOCATED ON THE PIP-PCB. THIS CAP MAY LEAK ELECTROLYTE ONTO THE BOARD AND OPENED A FEED THROUGH IN THE PATH BETWEEN C7001 POSITIVE LEAD AND THE EMITTER OF Q7003 OR CAUSE INTERMITTENT COLOR. PART # 181P504090. (CHECK ALL 'SMD' ELECTROLYTICS AND TRACES ON PIP) 3. NO MAIN OR PIP VIDEO, CHECK C7014, 47 UFD 16V ON THE PIP PCB. PART # 181P502060 4. CHECK FOR 7.2V DC ON THE BASE OF Q7003, IF LOW OR MISSING. CHECK THE VALUE OF R7002 (150 OHM 1/10W).LOCATED ON THE PIP-PWB. PART # 103P401050 5. SUSPECT R2045/R2048 (6.8 OHM 3W) FOR OPEN/RAISED VALUE. LOCATED ON PCB-SIGNAL AT 5V REGULATOR IC2003 PIN 5.

Nov 21, 2007 | Mitsubishi VS-60611 60" Rear Projection...

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