Hi,
solder joints on heat sinks - how much do they matter? Could poor joints on heat sink cause issues if they are not properly joining to hot ground?
I'm looking at power source module of Panasonic plasma TV and I see many of these having visually poor quality, but could they matter? In general I would guess no, but I saw a video where someone was stressing out the importance of tightening the screws when fastening the power source board specifically for the ground to be connected properly.
Thanks
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
Announcement
Collapse
No announcement yet.
User Profile
Collapse
-
Oh that would make sense, learning something new every day. It seems I got to know about components just enough to cause problems :-).
Anyhow, the markings are in the topic name: T3D 21 (with the digit 1 underscored if that makes any difference). The original diode has dark discoloration on its legs, as if it suffered some heat.
I measured the voltage between those 2 transformer legs and my meter shows some 800~900V AC, but it only has 750V range, so not sure how reliable that is (I should've measure that before I ordered that zener diode). That value doesn't make much sense to me,...
-
I went ahead, bought 22V 5W zener, replaced it and the TV doesn't even try to power on now. I removed it again and we're back to what it was (6 led flushes and turns off). So burnt zener (or none) seems to work better.
Leave a comment:
-
Took 2 shots, because the high components are blocking the view.
Note: the wire thingy there is a substitute for one leg of the driver chip - it came from China broken, so I had to improvise. However, the overall behaviour didn't change, so I might as well put the original chip back....
Leave a comment:
-
Thanks for the pointer, I just posted my question on that german forum. Yes I teared the whole thing down first thing and cleaned the radiator. But that didn't change anything so I proceeded to check the electronics.
As for the values on that test mode screen, some of those seem to be direct temperature readings. Specifically that TMP value is taken from the sensor that is directly on top of the compressor. That's the one I was heating up with hot air to understand if the dryer is stopping because it's hitting the max temp. Apparently not....
Leave a comment:
-
I hear you and I'm taking notes :-) However, the whole thing behaves pretty deterministicly, so there doesn't seem to be any element of chance. So I'm 99% sure we can rule out a random (relay) contact issue that would make it sometimes work and sometimes not.
As for the over current protection, my understanding is the big driver chip is feeding the compressor directly, so that logic is hidden to me. There are some feedback outputs from the chip though - would that be where the protection logic could be around?
VRU, VRV, VRW (low side emitter, Pin 12, 13, 14) in [url]https://www...
Leave a comment:
-
Thanks,
quite interesting that it's usually that big capacitor, I was certainly hoping replacing it would help, but no luck. I also previously tried all the relays and they seemed fine - I was able to turn them on by supplying voltage on the coil. How do you think a faulty relay would cause this issue? I would expect a faulty relay to not switch at all, or even be shorted, that I already saw. I admit I haven't seen much :-).
Anyhow, I tried to run the test again, it went to 48C and the compressor stopped. Then I tried to start the same test again immediately and the compressor didn't...
Leave a comment:
-
T3D 21 - zener diode?
Hi,
I'm looking at the power source module of my Panasonic plasma TV TX-P42ST50. The TV goes into suspended state almost immediately and keeps flashing 6 times.
That zener diode is marked on the board with the diode sign (D204), that much I know. It seems to be open completely in both directions and its legs seem dark, as if it suffered some heat.
I'm having trouble finding a replacement. Does 21 stand for 21V?
The only other clue I have it is connected across 2 of the legs of a transformer (primary side).
Any idea how to find a replacement?
Thanks
[URL=filedata/fetch?id=3252836&d=1713119993][ATTACH=JSON]{"alt":"Click...
-
Siemens dryer iQ800 WT48Y780EU
Hi,
I'm looking for ideas on how to aproach this, I spent many ours already.
The dryer doesn't get hot, only warm and then gives error E25 (Fault with the sensor or electronics detected).
Now I'm testing it using the service mode - it gets the temperature of the heat pump liquid to 52C and then it stops the heat pump. After few minutes it then produces E25.
I tried to understand if it stops the testing because the final temperature was reached and I don't think that's true. While it was running, I heated that sensor using hot air to 80C and then it stopped. So I think the...
-
Hi,
I'm trying to replace what seems to be a film(?) Epcos capacitors labeled with:
Z111774865 P10
U12 J 900 D8
I'm guessing it's a 120nF 900V? But I would appreciate exact reference, because google doesn't find Z111774865 at all.
They came from a Siemens induction heater, 3 of them are connected in parallel between the 2 wires that power individual induction segment.
Their size is aprox. 26mmx15mmx7mm.
Thanks for any help
Leave a comment:
-
ESR meter not showing anything for 0.1uF
Hi,
my ESR meter doesn't show any ESR for this capacitor: [url]https://www.tme.eu/sk/en/details/r46ki310000m1k/tht-film-capacitors/kemet/[/url].
Is that an issue? My RLC meter shows the capacitance: 85nF.
I'm new to ESR, so maybe this is all expected for this type of capacitor?
Thankshttps://Hi,<br /> my ESR meter doesn... of capacitor?
-
I switched the capacitor for a new one but that didn't solve it. Next up is likely the main invertor chip IKCS17F60F2A, but I'm not 100% sure, not even 51%. I guess it could still be the compressor leakage. The chip is 16.3eur on Ali, I guess I will try that. The whole invertor board is 335eur as original Siemens spare part.
Leave a comment:
-
Thanks guys, that indeed looks like what I have. However, I don't see ESR value in that data sheet.
Leave a comment:
-
Easier said than done, . Mine has a sticker with what looks like a Bosh part number (BSH 9000558676), but I couldn't find any more details on that.
I'm attaching a photo in case it would help.
I only found one similar on web, not sure it's identical and the data sheet doesn't specify ESR: [url]https://static6.arrow.com/aropdfconversion/22fdfa921a31f48a67a2466d73727a9948bdfdc0/e-cap_largecan_lv_2011.pdf[/url]
Any opinion welcome.https://Easier said than done, :(. M...tails on that....
Leave a comment:
-
-
-
Right on the money, this is what I checked earlier this morning and 2 of the 4 transistors are shorted. The diode bridge seems fine.
Thanks
Daniel...
Leave a comment:
-
So that's what I'm trying to understand. Besides finding the root cause, I'm curious about that burnt solder. Once I find and fix the root cause, do I just re-solder those burnt connections? If they indeed were designed as a fuse of a kind, I imagine their function would very much depend on the kind and amount of solder I would put there.
Thanks...
Leave a comment:
-
Nothing visibly obvious on the other side of the board, I'm attaching the picture. The only 2 protruding legs visible on those burnt rectangles belong to the blue capacitor (2u2) and the round brown capacitor just next to it
Not sure if the part number is what's shown on the other picture but hoping it is....
Leave a comment:
-
Siemens induction panel PCB burnt
Hi,
this is a Siemens induction panel, one side seems damaged, I attached both good and burnt picture to compare. I'm not sure what those rectangles a are for, but they are connected by a solder. That seems to be what got burnt, so I'm wondering it that was some kind of a protection. Do I just try to re-solder them?
Thanks,
Daniel...
No activity results to display
Show More
Leave a comment: