hi to everyone . i have a board from a viessmann gas heater and it has a Microcontroller - Microchip Pc PIC16F877A-I/P DIP-40 and i whant to buy anather one , do i have to programe it or is it programed. thanks john.
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Re: Pc PIC16F877A-I/P DIP-40
you have to program it,
and obviously you need the hex file first.
the original is probably protected btw, so dont expect to read the code from it. -
Re: Pc PIC16F877A-I/P DIP-40
do they get dameged or unprogramed when they are on in use .i checket everything on the board and did not find nothing (open or closd or burnd )Last edited by olymbou; 04-28-2014, 03:00 PM.Comment
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Re: Pc PIC16F877A-I/P DIP-40
They don't usually get unprogrammed, flash memory inside has very long retention (decades).
It's possible the chip could be damaged if something connected to it failed, but otherwise they shouldn't just fail all of the sudden.
It's most likely the internal memory is protected (you can't read the hex data from it) so even if you buy a spare mcu or request one as a sample (it's old, almost obsolete so made in small quantity, therefore expensive) you'd still need the code to upload in it and a programmer.
I have a programmer and I could flash one for you but again.. you need the code in the first place.Comment
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Re: Pc PIC16F877A-I/P DIP-40
it's not rare or expensive - it's worth a few Euro and easy to get in any quantity.
but the code is the prooblem.Comment
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Re: Pc PIC16F877A-I/P DIP-40
I don't want to check again, but it was about 5-6 dollars on microchip's own site. It's 6$ on Digikey: http://www.digikey.com/product-detai...%2FP-ND/446143
They don't even recommend this one for new designs, the 887 is recommended.. which has very minor differences and costs only 2.65$ on Digikey.
You can get more powerful PIC chips for that money, for example you can get pic18f4321 at 3.2$ when getting 10, or 3$ when getting 25.
With 3.4$ (10 quantity) you get get pic18f4550 with usb support, 48mhz, the works... much more powerful and more user friendly (better architecture for C)Last edited by mariushm; 04-28-2014, 09:22 PM.Comment
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Re: Pc PIC16F877A-I/P DIP-40
Check the obvious - does the PIC have all the power supplies present and correct? If it has a crystal or other clock source check that its functioning."Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Hi all. Hoping someone can help. There is an oil filled heater at work that is not running. The pump that fires the oil is not kicking in.
I've taken the PCB out the panel and found a board that is marked IPD-0018-E
It's receiving 230v ac and the output relay has 5v DC present. The various diodes and resistors etc all check out ok. The only thing seemingly left is the IC labelled as PIC 16F1937.
My question would be. How would I know this is the component causing the issue/how do I test? And should I simply order one and replace it? Or does it need programming... -
Hello guys,
Wondering if someone know - EC MEC1723 (on new Lenovo series) - is it programmable? Which programmer could be used? RT809F can handle it? If not, any other can?
I did not find any useful information on the internet. I will appericiate any help.
thanks a lot...11-29-2023, 12:02 PM -
Hello. I'm experiencing an issue with my Aorus 15p xc laptop.
The motherboard is GA-RX5LXC.
The problem I'm encountering is that the laptop sometimes fails to power on, and it appears that a protective mechanism is being triggered.
I've observed that while the laptop is in operation, the EDP_U8 microchip (I've included a photo) heats up significantly, reaching temperatures of 75-80 degrees Celsius.
However, when I disconnect the LCD from the motherboard, the EDP_U8 microchip doesn't heat up. I've conducted power supply measurements with the screen disconnected.... -
Gigabyte h310m s2h rev 1.1 motherboard come bios screen and keep restarting .sometime 2 3 times fan spring and off after come bios screen . some time working 15 to 30 minutes .
I allready checked
VCCPLL voltage ok
VCCIO Voltage ok
VCCIO Enable ok
VCCSA Voltage Ok
VCCSA Enable Ok
VRM IC voltages ok
Replaced VRM IC
Replaced LM358 ic
Re programed Bios
But sometime motherboard working 20 30 minutes and restarting ......sometime have fan spring and off error ..........anyone have solution...07-08-2025, 10:16 AM -
Hi brothers, please i need help diagnose acer nitro 5 no display issue.
model: nitro 5 an515-55
motherboard part number: GH51M LA-K862P Rev: 1A
i received this laptop with a short in power line, it was a capacitor + a mosfet on VCORE line , the laptop turned on cpu and gpu getting warm all voltages seem ok except vcc_gt but no display/caps lock activity also no hdmi out.
i flashed new bios also ec(ene kb9022) the same result .
disabled discrete graphics (rtx 3060 ) by cutting its power and shifting a resisror near pch VCC_GT comes but still the same...
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