Can someone tell me what this is?
Attached Files
-
-
Re: function?
Here is the data sheet for what it is and how it works.
-
Re: function?
A simple google search for what it's written on the chip says what it is.
General-purpose BA10358/BA10324A family and high-reliability BA2904 /BA2902 family integrate two or four independent
Op-Amps and phase compensation capacitors on a single chip and have some features of high-gain, low power consumption, and operating voltage range of 3[V] to 32[V] (single power supply ). BA3404 family is realized high speed
operation and reduces the crossover distortions that compare with BA10358 family.Comment
-
Re: function?
Its on the invertor board? Of a samsung lnt3242hx/xaa, it has sound and picture but no back light, if I jump the terminals together my back light works agaimAttached FilesComment
-
-
Re: function?
I tried Google search but wasn't sure what it was talking about :-(Comment
-
Re: function?
The backlights come on and stay on and you can see normal pictures?
You basically connected pin 4 (+VCC) o the non-invert input pin 3 of the Opamp which will make pin 1 output pin to go high. I have no idea what that IC is being used for in that section of the circuit, you should check the DC voltage at pin 1 without jumping pin 3 to pin 4 see what you get, then when the pins are jumped.
Also post the whole picture of this inverter board so I can tell you where to check and see if it is getting the bl_on (inverter_on) signal or not.Last edited by budm; 07-02-2014, 09:47 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: function?
Sorry I work long hours, but yes I let it play like that's for about 5 mins and everything seemed fine, this is the boardAttached FilesComment
-
-
Re: function?
Check the DC voltage on the ON/OFF pin on the inverter board when TV is OFF and when TV is ON, then report the readings. You can see the connector pin out printed close to the connector.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: function?
I'm not sure I have the right meter for this, its 0 off 4.17v on, if I reverse the ground and positive. Its 14.13?? Please be patient on this with me...Attached FilesComment
-
-
Re: function?
You have several lamps in that tv, each with its transformer ... from each transformer there's a signal which tells if the current used by the lamp is too high, or maybe if the lamp turned on or not.
The signal coming in the opamp may be a sort of "sum" of all signals coming from all those transformers, so if the voltage is too high, the opamp will turn off the whole set of lamps to protect the transformer/driver etc etc.
The incoming signal is compared to a "good" voltage level and if you signal voltage is too high, there's a problem with the lamps.
By shorting the pins, you're probably disabling the opamp so the protection is skipped and the lamps stay on, but if there's a problem with one of the fluorescent tubes or with one driver/transformer, you may have problems in the future (overheating, maybe it's loose wire at a fluorescent tube or something like that, maybe tube is just too old and uses too much current...)
I'm just guessing though...Comment
-
Re: function?
So the BL_ON signal is fine, beside what mariushm had indicated, we do not what that pin 1 output pin of the Opamp goes to, without diagram, will never know unless you will try to trace out the wiring on that inverter board and draw up the diagram to see how it is put together.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: function?
Is the blue pin 1?? And does the connectors in green look OK? There's quite a few dark spots like that on the board? The other boards look fine visuallyAttached FilesComment
-
-
Re: function?
It appears to run to e-pwm?? I could be wrong I it runs under a connector so I kind of lose it for a minComment
-
Re: function?
Yes, that is output pin 1. I cannot see well on the blue circle.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: function?
So what voltage do you have on the white connector I_PWM and E_PWM? Check in DC mode and in AC mode.Last edited by budm; 07-04-2014, 08:00 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: function?
E doesn't read?? I is 23.7 and 14.35??Comment
-
Re: function?
"I is 23.7 and 14.35" is that 23.7VDC and 14.35VAC? or mV? It is way too high.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: function?
Vac I believe, I'm pretty sure I jus killed it :-(Comment
-
Re: function?
These are fuses right? The were three ohms before the thing I asked in the first post kinna popped? Now the back light doesn't come on at all and they read 15.21 and 23.11 volts now...Attached FilesComment
-
-
Re: function?
These were also roughly 24v when I started now the two in blue are still 23-24, the 2 in red are 2.224 also all the cconnectors to the lamps were 14.4 volts now the black one hhas no reading... The pins all still read fine, so the power doard is still functioning isn't it?Attached FilesComment
-
-
This is a new item at Electronic GoldMine that has arrived within the last few weeks
Here is the link for them I know for sure that it works because ( I tried it on mine soldering station ) I bought two of them and I just bought two more of them so I have some extra replacement ones in my parts bin
Stahl Tools DDDS Replacement Iron for DSDS Stahl Solder Station
https://theelectronicgoldmine.com/products/g28392
One note it will not work for the ZD-917 or similar model number that does not have the sleep function that are the same iron but the plug only...11-24-2024, 01:25 AM -
Hello everyone, I'm troubleshooting an MSI Delta 15 (MS-15CK1) motherboard, and I need help identifying the function of the two coils marked in the attached image. The laptop powers on and responds to the keyboard, but the screen does not turn on-neither the LCD nor the backlight. I've checked the main power rails, and all other coils seem to have the expected voltages:
• 0.91V for the GPU
• 1.7V for VRAM
• 3.3V and 5V rails 1.8V for the BIOS
• 0.9V for the CPU and iGPU 1.2V for the RAM
However, these two coils are not showing any voltage.... -
Hi,
I am repairing a ups which doesn't turn on ,it has the following ICs:
SG3525 used to drive inverter mosfets.
couple of uc3483, one for the power supply and another to drive a big mosfet at the output stage(i think the technique is called boost)
A LM358 and TL074 for control mechanism and of course the uController.
The SG3525 is shutting down every time the ups is turned on.
I want your help to know the function of LM358 and TL074 in the system.
I reverse engineered the LM358 circuit and i think that one of the block(A) is used for battery level... -
BOOST CONVERT CONTROL IC
The FP5139D-LF, FP5139DR-LF, FP5139W-LF, FP5139WR-LF, FP5139T-LF, FP5139TR-LF is a boost topology switching regulator control IC for battery-used applications field. The FP5139 includes a totem-pole single output stage for driving NPN transistor or N-MOS, high precision reference (0.5V) for comparing output voltage with feedback amplifier, an internal dead-time control for controlling the minimum duty cycle, programmable soft start with short circuit protection function and logic level control for operating mode or standby mode.
FP5139 FEATURES...10-07-2024, 05:15 AM -
I can't find a forum to discuss "instrumentation Troubleshooting", but PS maybe the closest.
So, I'm having an issue with about 13 year old Agilent Function Generator. it works, passes self-test, but it has an annoying "audible" noise, that changes as I change the output frequency setting of the instrument. Prominent around 600 Hz and up (at least that's what my ears are picking up.) I saw on some forms that it could be fan, linear regulator, dried up caps,... I can't seem to find the source of audible noise. Here is what I tried:
1. Turn the output off - still...
Comment