When replacing capacitors is the actual physical size of the capacitor somehow affect how it will work? Is there a higher failure rate with the smaller size or will they not work at all even to test if it's worth recapping? The reason I am asking is I have quite a few that are just not the same physical size and have been hesitant to even use them because everyone says it should be the same size.
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Re: does size really matter?
the same size is because lots of the places for them is crowded and a larger size won't fit. As long as they have the same uf and voltage (or higher voltage), they are fine to use for troubleshooting. If it fits and works, leave it in. If it's in a low esr requirement, then use it to test. Keep the temperature the same or bump the 85c to 105c. They are all smaller now compared to the older caps with the same values. New technology, but seems more failures.Last edited by steve2; 02-03-2011, 09:06 AM.
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Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
I believe Chip 2 is BIN is the main one as it contained the Windows product key, marked with XXXXX for now.
SN: PF3G1REP
MODEL: 20KW-00J1AU
PROBLEM: Turns on blank screen, charging circuitry motherboard looks good. I have tried another firmware here - but resulted in 5V will not go to 20v due to different PD firmware I believe - using the current firmware it does go to 20V.
Requesting a firmware clean/BIOS region cleaned. Here is output from ME Analyzer:
╔═══════════════════════════════════════════╗...Yesterday, 09:01 PM -
TV Model: Hitachi 40HYC42
Power Supply: 17IPS71
MainBoard: 17MB95M
Panel: VES400UNDS-2D-NO3
When the set came in it was dead. Fuse was open primary side and the power mosfet was shorted. So I ordered a new power supply. Now it turns on, only displays "Hitachi" and then power off red and blue led flashing.
I had to modify the 0ohm resistors in the led backlight of the new PS like the original power supply.
Is there any variants on 17IPS71 power supply's?
UART output pins 10 and 12 on scart connector:
...Code:12:24:04.595
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My question has to do with through-hole Electrolytic Capacitor physical size and finding the correct specification in ordering a replacement.
Example: I'm working on an old video arcade monitor. The parts list calls for two (2) 6800pF, 50V Electrolytic Capacitors (ECap). Based on that specification, you can go to Mouser, DigiKey, etc and get a through-hole ECap at that spec…and get a far smaller one (physical size-wise) than what was on the board.
From my limited knowledge, I understand that size does matter in this application because of the stress that the circuit... -
(TL;DR skip the first paragraph)
I encountered my first dead motor run capacitor at a customer this week.
For some fields I guess it is a very common occurrence but the usual way for industrial machines here is to use 3-phase motors.
(Unless a servo motor makes more sense that is).
But for some reason this 3-phase machine uses a 1-phase motor for its liquid coolant pump.
The pump would run but sometimes trip the 10A breaker.
I monitored it starting and stopping for over an hour until it finally stopped in a specific spot between its windings:
Then it could...
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