[FONT=Calibri]I never tried to desolder with connectors so close. I tried with connectors around, with kapton on it, and direct hot air, and after the connector was a little rounded… I'm scared.[/FONT]
[FONT=Calibri]Ok thx, I like this way : desolder connectors first. Because the new chip with leed free balls could be long to solder and with high temp. I guess it's better to solder with hot air by the top.[/FONT]
[FONT=Calibri]The way I see :[/FONT]
[FONT=Calibri]1 - desolder connectors by bottom, help with 140 solder paste on connectors : that could decrease...
corrize
Badcaps Veteran
Last Activity: 06-07-2025, 05:11 AM
Joined: 04-05-2021
Location: Paris
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Desoldering - soldering BGA chip close plastic mini fpc connectors ?
[B][FONT=Times New Roman][FONT=Calibri]Hello, I need your advise please ? I need to remove and replace the BGA black chip with fpc connectors around. The PCB is small, from camera.[/FONT][/FONT][/B]
[B][FONT=Times New Roman][FONT=Calibri]There is no plastic component directly under, on the other face, (only fuse and oscillator I can remove if they are sensitives to heat), but there is a lot of very small smd components I don't want to desolder by mistake.[/FONT][/FONT][/B]
[B][FONT=Times New Roman][FONT=Calibri]I have :
- hot air, and a[/FONT][/FONT][/B] [B][FONT=Times... -
[FONT=Calibri]Yes, you found it, exactly this one.
And now I saw why marking codes are so differents : only the first letter « A » is usefull.[/FONT]
[FONT=Calibri]Thanks you[/FONT]
[FONT=Calibri]Yes, you found it, exactly this one.
And now I saw why marking codes are so differents : only the first letter « A » is usefull.[/FONT]
[FONT=Calibri]Thanks you[/FONT]
[FONT=Calibri]Yes, you found it, exactly this one.
And now I saw why marking codes are so differents : only the first letter « A » is usefull.[/FONT]
[FONT=Calibri]Thanks you[/FONT]...Leave a comment:
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Resonator - quartz broken - how to find the same (same frequency) ?
[FONT=Calibri]Hello, I have a Fujifilm hybrid camera with an issue : the time don't run. I set 12:00 and 3 min later, the same : 12:00[/FONT]
[FONT=Calibri]I saw an obvious root cause : a broken quartz (resonator). But with the box broken, I can't read the marking code. Probably : 464… or A64…[/FONT]
[FONT=Calibri]I found on the web a picture of the same camera board but with marking code very different. Probably : A7…5N[/FONT]
[FONT=Calibri]I'm searching another one for compare…[/FONT]
[FONT=Calibri]Do you have an idea or another way for find the frequency of this... -
[FONT=Calibri]Mosfet is a good idea. That explain all the measurements « open ».[/FONT]
[FONT=Calibri]In the previous photo, RX component and 2 resistors indeed are missing because destroyed by rust (see photo before cleaning, the resistor on top has same value the one beside : 1MOhms).
[FONT=Arial][COLOR=gainsboro]You found it. RZM001P02T2L[/COLOR][/FONT] match 100% indeed. Probably I would never found it, thanks. I will order it and replace.[/FONT]
[FONT=Calibri]Mosfet is a good idea. That explain all the measurements « open ».[/FONT]
[FONT=Calibri]In the previous...Leave a comment:
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How to clean fpc connectors oxydated ?
[FONT=Calibri]Hello, do you know if it is possible to clean oxydated fpc connectors until it back brilliant please ?[/FONT]
[FONT=Calibri]I know the best is to replace, but sometime micro fpc are very little oxydated and very hard (or unable) to find as new. So, there is may be a chemical product for that ?[/FONT]
[FONT=Calibri]I use vinegar for rust on metal screw or little metal pieces and I finish with WD-40 for protect, else the rust can come back. That works pretty good.[/FONT]
[FONT=Calibri]I not yet tryed on connector. Do you have a good method please ?[/FONT]
[FONT=Calibri]Hello,... -
[FONT=Calibri]Thanks for reply, the original RX is lost, but I found 2 other « RX » side by side on the board (see pictures)[/FONT]
[FONT=Calibri]I measured in circuit, in diode mode and resistance mode (see schematics) but the result is not obvious for me ? I guess it is not a zener, and not a diodes, maybe not a transistor because I cant see clearly a « diode ».[/FONT]
[FONT=Calibri]I noticed no pin is ground, and I noticed the 2 pins at same sides are linked to same pin to other (see picture).[/FONT]
[FONT=Calibri]The board is dead, so the components can be defectives.[/FONT]...Leave a comment:
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Thanks for reply. See the area around. In the largest picture, the RX component is missing, you can see 3 pads only. There is a parallele configuration, so the component beside could have the same function (It is a camera DLSR board).
I saw the list of "RX", and I noticed thic component could be a LM4050, maybe ? only because it is a common component, and because in the board that could be a power controleur-regulator, and because that could be in comparison configuration, but.... I guess, it is a general idea, nothing precise ?
...Leave a comment:
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What is this component ? smd double diode like, marking code : RX
Hello, do you know what it is this component marked RX please ? I can't find it. Probably it is a part of serie, because I saw another marked RW....
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[FONT=Calibri]Indeed if you mesure between 2 alternate pins on connector, you found : 0.15mm. And when you mesure between 2 tracks on the ribbon cable, it is the same : 0.15mm.[/FONT]
[FONT=Calibri]The key is this number : 0.15mm. But it is very difficult to find. On Digikey or Mouser website, when you search fpc connectors, it show « 0.20mm pitch or under » but in the list nothing under 0.20.[/FONT]
[FONT=Calibri]Indeed if you mesure between 2 alternate pins on connector, you found : 0.15mm. And when you mesure between 2 tracks on the ribbon cable, it is the same : 0.15mm.[/FONT]Leave a comment:
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[B][FONT=Cambria][COLOR=#4f81bd][FONT=Calibri]Yes this one : (he sent a 0.6mm between 2 pins)
[URL]https://fr.aliexpress.com/item/1005005912426681.html[/URL][/FONT][/COLOR][/FONT][/B]
[FONT=Calibri]And this one (he sent a 0.5mm between 2 pins, that is wrong compare the ad) :
[URL]https://fr.aliexpress.com/item/1005006036502156.html[/URL][/FONT] [B][FONT=Cambria][COLOR=#4f81bd][FONT=Calibri]In fact, for 0.3mm between 2 pins, the specs must be « 0.15mm pitch »
If you read : « 0.3mm pitch », that means there is 0.6mm between 2 pins.[/FONT][/COLOR][/FONT][/B]...Last edited by corrize; 09-13-2024, 12:30 AM.Leave a comment:
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[B][B]Keep searching, can't find. How do you do for find your connectors please ? You buy new ones or take from boards for parts ?[/B][/B][B][B]Keep searching, can't find. How do you do for find your connectors please ? You buy new ones or take from boards for parts ?[/B][/B]Leave a comment:
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[B][FONT=Times New Roman][FONT=Arial][COLOR=gainsboro]Update : found one connector in commercial ad, after searching with « 0.15mm ». [/COLOR][/FONT][/FONT][/B]
[B][FONT=Times New Roman][FONT=Arial][COLOR=gainsboro]It seems the distance between 2 pins is linked with pin width. So for 0.3mm distance : 0.15mm. The key number seems 0.15mm for find this connector... but I didnt found where to buy.[/COLOR][/FONT][/FONT][/B]
[B][FONT=Times New Roman][FONT=Arial][COLOR=gainsboro]Update : found one connector in commercial ad, after searching with « 0.15mm ». [/COLOR][/FONT][/FONT][/B]Leave a comment:
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Where to find a very small fpc connector 0.3mm between 2 pins ?
[B][FONT=Times New Roman][FONT=Arial][COLOR=gainsboro]Hello, I search this connector (oxydated).
It's a fpc zif low profile connector. It come from camera sensor, it is very small : 0.3mm between 2 pins.
I ordered 2 from Aliexpress called « 0.3mm pitch » but one was 0.5mm between 2 pins and the other 0.6mm. In fact « 0.3mm pitch » seams to be the pad width and not the distance between 2 pins.
I can't find it. The other websites like mouser dont show the datasheet, and I can't check if it is 0.3mm between 2 pins ?[/COLOR][/FONT][/FONT][/B]
[B][FONT=Times New Roman][FONT=Arial][COLOR=gainsboro]Do... -
[FONT=Calibri]Thanks for reply. I'm still waiting connector, not yet delivered.
I will probably cover the sensor, but I don't want isolate all the board except connectors, because that could create a hot spot around connector and cold spot on board under kapton. I prefer rising slowly the temp to 200 degree on all board, and then increase temp on connector.[/FONT]
[FONT=Calibri]I cant reach the connector pins with solder iron, because there is no pins, the connector has only pads fully under. The « pins » you see on picture is just solder on pads of the board, because pads are longer.[/FONT]...Leave a comment:
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Soldering plastic low profile FPC close camera CMOS sensor ?
[FONT=Calibri]Hello, I will have to solder a very small FPC connector (pins : 0.3mm), on the pcb of CMOS sensor, it is very close. I was surprised by movie on ytb, someone soldering directly with hot air directly on the sensor without kapton, nothing.
CMOS sensor seems resist to high temps.
But I also directly saw sensor broken because a blocked motor at the corner became very hot and probably bent the metal frame and cracked the sensor.[/FONT]
[FONT=Calibri]I have low melting point solder.
I will probably test hot air directly on one of plastic connector... -
What are the 2 or 3 most used BGA balls sizes please ?
[FONT=Calibri]Hello, I want to buy BGA balls (not stencils, only balls) but I don't know what size, it's just for reballing the new chip balled if the first attempt fail. So I will rarely use it. Probably chips are PMIC with max 60 balls. I don't need to reball EC chips from laptops of big chips like that.[/FONT]
[FONT=Calibri]So what are the 2 or 3 most used BGA balls sizes I should have for cover the jobs please ?[/FONT][FONT=Calibri]Hello, I want to buy BGA balls (not stencils, only balls) but I don't know what size, it's just for reballing the new chip balled if the first attempt fail. -
[FONT=Calibri]Here it's a simple board, DC-DC down convertor so the chip is easy to find as guilty in this case because the other components are easy to check, but this chip is never shorted. I have this one, and in 4 or 5 dead boards : no short. Even if the chip is physicaly broken. It's harder/not possible to diagnose when that sort of chip is on other big board.[/FONT]
[FONT=Calibri]The most of the time, I can't diagnose with power on because the boards are inside box with cables. Sometime, I diagnose like this : if no voltages out of this chip and no short, so chip dead... Because I...Leave a comment:
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How to diagnose little step down and power management BGA chips never shorted
[FONT=Calibri]Hello,[/FONT]
[FONT=Calibri]I have different sort of those little BGA chips (step down DC-DC, power management battery, …) I replaced 10 on differents mobile devices (no schematics) but I noticed often they can be dead but never shorted. I see some signs : burn marks, resistance drop by comparison with good board (40 KOhms to 1 KOhms for example)… but not easy to be sure of the diagnose. Because I can't access on all tracks (balls) with the meter.
Sometime, I know only after replacing chips.[/FONT]
[FONT=Calibri]Do you have tips for diagnose please ?[/FONT]... -
Wow !
[url]https://fr.aliexpress.com/item/1005006929352658.html[/url]https://Wow !<br /> <br /> [url]http...658.html[/url]Leave a comment:
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