Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
Announcement
Collapse
No announcement yet.
User Profile
Collapse
-
And does it sound reasonable that feeding 24V to the relay coil pins (correct polarity) the transistor started to smoke? Is this a hint that the Q was already blown?
Also can I have damaged any other electronics before the transistor driver (like an IC) maybe getting these 24V to get back to the IC?
Thanks
Leave a comment:
-
Last update, I spent some time last weekend on this TV and found a position where the tape would allow the TV to turn on. BUT there was a small (like 4cm) bar at the bottom where the image was a little degraded, like greyed out. I moved the tape patch everywhere right and left, tried shorted pieces of tape, and nothing, I had to give up and leave it as is, this is a summer house where I spend only a couple months a year so I will probably be able to live with this.
Thanks everyone
Leave a comment:
-
Final update on this. I replaced the mosfet by the correct model, and took it to be tested before I tried with the the resistor. It failed, "shorcut in bus" message right away.
Took it back home, put a 0,1 ohm resistor in the bus sense R and this tested perfectly now, with no errors and controlling heating correctly.
So this board had basically fallen into the wrong hands when it was sent to the shop to be repaired in the first instance. Thanks everyone who replied here!
Leave a comment:
-
Ok, last one (hopefully) update on this.
I released some of the water pressure out, tested the heater for a while and seems to be running ok, continously with the new alternate "digital" board, so everything fine for now.
Thanks everyone!
Leave a comment:
-
Oh also I can see in my own pictures.. .that the second Q at the second relay is burnt by the end of the letter W...And I measured resistance from E to C in this transistor and it has 30 ohm on both polarities, which is not happening on all the other Q's
Should I just replace this Q?Last edited by edugimeno; 04-18-2024, 02:25 PM.
Leave a comment:
-
Biomass Boiler not driving cleaner motor relay. ENERTRES BIOMASA BI-650
Hi everyone!
I have this board that suddenly stopped supplying power to an output that drives an interchanger cleaner motor.
I checked while the board was in place with all wires attached and there's no AC voltage on the corresponding plug X5
This X5 is driven by fuse F8 (tested OK) which comes from the second orange relay
To make sure there are no charcoaled contacts inside the relay, I got a 24VDC power supply and got it ready to manually power up the coil side of these relays.
I respected the polarity, positive to cathode of protecting diode
So provided all...
-
Actually my old front panel had an analog pressure meter that was stuck, so I've been blindly adding or removing water to the system for some years.... When I first plugged this other new panel with alternate board fist thing I realized is that it shows the pressure in the digital display, and I believe it was showing 5.X bar....way above required. I just downloaded the manual and it says 0.8 - 2.0 bar working pressure.
Maybe my old board woulnd't cut due to overpressure and this one does. I will empty some water and try again.
I understand that if the water pressure is too close to...
Leave a comment:
-
I talked to the guy, he's the manager at a large student housing. He said he claimed this to the shop where it was (wrongly) repaired and they sent back a long audio in which they explained that they changed several parts (and attached a picture with the mosfet and 3 small IC's) and saying first they needed to fix the receiving part and then it was ok and then they realized it wouldn't send so they replaced the transistor and then tested it in their bus and found it working correctly... He asked then because he had been charged 300€ for this repair, and when he called back saying it wasn't working,...
Leave a comment:
-
Ok after watching dozens of videos of people with the exact same TV and same problem and being able to fix them with the LVDS cable taping methid, I went to my town home where I have this TV.
I disassembled it (a little hard if you don't know, they don't have screws and the plessure tabs are very firm)
Tried with the main board socket disconnected. All backlight went on full brightness, no reboots. So PS is good
Plug main to PS again and unplugged LVDS output from main. TV went on, full BL at first, then dimmed light, and stable, of course no image but it woudn't reboot
...
Leave a comment:
-
Ok I have some information today. I went to my town home and spent some time checking this.
First of all, I still got the spakr and blwon fuse when I triggered the thermostat. But it wouldn't blow if I manuall would jumper the trigger points (pins 3&4). I assumed that my thermostat was bad and it was incorrectly putting mains voltage into what should be a dry contacts output, and then when I got home I checked the manual and the ouputs I was using in the thermostat were labeled "LOAD" and I had other output labeled "DRY CONTACT", so it was my bad.
No back to...
Leave a comment:
-
(Edited, wrong post...), its not letting me DELETE the commentLast edited by edugimeno; 04-02-2024, 12:34 PM.
Leave a comment:
-
Thanks for your time!
My comments:
Yes power+ goes straight (after a protection Diode in series D1) to the mosfet Source pin
Large top resistor (R42, 330Ohm)) goes from Drain of mosfet, to SMD Q T3 pin 2 (I believe collector of a PNP Q labeled 2F)
T2 is also labeled 2F so it should be a PNP transistor
Yes, the far end of R45 goes straight to a ground plane in the back side thru a via. The right end connects thru the coil directly into the BUS. Also the right side of BUS goes to D2 for reverse protection and also to R52 and T7
The left bus side goes to mosfet...
Leave a comment:
-
Ok, I have some advances here. Take a look at both boards. Left if the board to be repaired, that was already sent for repair to the official "shop". Right is a working board, although the guy doesn't want to use it because this variant doesn't have a LAN port so he can't configure it from his computer.
All seem the same except the LAN port barely visible at the bottom left
Then you will see at my board (left) that I replaced a, supposedly marked "100" resistor R45, by 2x4.5Ohm resistors in series (thru hole but mounted above). Then I go to the new board...
Leave a comment:
-
Ohhhh FAIL!! I went to this place today, plugged my device in the bus, and "SHORTED BUS" came up right away! I measured the bus with no device and it got no voltage (so the voltge is powered by this device) and it showed 200 Kohm.
I could bring home a workind device, as the guy has some spares, so I can compare voltages...
Leave a comment:
No activity results to display
Show More
Leave a comment: