Originally posted by bsweasel
Plainbill, U101 was above....I was right, I knew someone would ask. I just don't know how to test it after reading that datasheet.
-
Re: Starlogic HD20W
Plainbill, U101 was above....I was right, I knew someone would ask. I just don't know how to test it after reading that datasheet. -
Re: Starlogic HD20W
What is the part number of U101 (the 16 pin IC on the inverter)?
PlainBillLeave a comment:
-
Re: Starlogic HD20W
Ok new HQ pics posted. This 2 seconds to black thing is really driving me crazy.Attached FilesLeave a comment:
-
-
Re: Starlogic HD20W
Just for completness sake and because the problem may not be in the inverter board, post clear focused pictures of the logic and power board - both sides (top down view).
Take the boards to a window on a sunny day and use macro mode for best quality pics.
2 seconds to black could be a problem on any of the boards (power, logic, or inverter). Or bad CCFLs, or solder joints.
Originally posted by bsweaselLast edited by retiredcaps; 07-08-2010, 11:22 PM.Leave a comment:
-
Re: Starlogic HD20W
Also, check the fuses on the inverter board to make sure none are open.
AFAIK, another test you can do for transformers is (with power off and unplugged) with ohms setting is described below. It doesn't matter which you pick as pin 1. What you are looking for is that they are the same on both transformers.
pin 1 to 2, 1 to 3, 1 to 4, etc 1 to last pin
pin 2 to 3, 2 to 4, etc
pin last pin-1 to last pin
write down the ohms reading for each. What you are looking for something that is obviously out of place. For example, if transformer #1 pin 2 to pin 4 is 0.5 ohms and transformer #2 (same pins) is 5000 ohm, then you know something is wrong.
Voltage regulators are circled in red.
As for learning, I am hoping I am explaining things correctly. I'm learning by following PlainBill's/Wizard and other's posts.
PS. Check the transistors on the power board to make sure none are shorted. On the Benq power boards, the C5707s are often shorted.
Originally posted by bsweaselI watched that video.....problem is I don't know what pins are primary/secondary so I'm not sure I'm checking the right things.
Second...could you point out the voltage regulators to me....I'm still learning what all this stuff looks like!
Attached FilesLeave a comment:
-
-
Re: Starlogic HD20W
Originally posted by retiredcaps
I watched that video.....problem is I don't know what pins are primary/secondary so I'm not sure I'm checking the right things.
Second...could you point out the voltage regulators to me....I'm still learning what all this stuff looks like!
Leave a comment:
-
Re: Starlogic HD20W
I like this video on how to test a transformer.
http://www.youtube.com/watch?v=eNuGWBPRGKA
You may not need to know the specs if the transformers are both identical in readings.
Also, test your voltage regulators on the inverter board.
Originally posted by bsweaselLeave a comment:
-
Re: Starlogic HD20W
I know others may ask this: Controller chip is 16 pin:
UTC TCA5
TL494L
http://pdf1.alldatasheet.com/datashe...94L-S16-T.htmlLeave a comment:
-
Starlogic HD20W
I have a Starlogic HD20W LCD that has the infamous 2 seconds to black problem. I've been reading up on this and would like to test the inverter coils, but I can't find any specs on these things. So I thought I'd as for some help. Here are some pics(sry poor quality) Will do better ones later. And the inverters have the following printed on the side.
LTL19009607B
HI-POT BJ0630
Can anyone help with the pinout or what I should expect for ohm readings?Attached Files -
-
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.
Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today.... -
Hello
I have power adaptor(220V/input, 12V 1.2A/output) which has symptom of fluctuating output DC voltage between 11.5V-12.2V.
So I opened its plastic case and when switched it on, I heard constant tik tik sound from inside its PCB.
I measured DC voltage between negative and positive pin of the largest capacitor(400v 10uf) and it was measured contant 300V.
I also measured ESR value of all capacitors and I noticed that one of capacitor(KMG 16v 470uf), which located in the secondary side, have high ESR value(10 ohm),So I replaced it with same specification NXH capacitor.... -
Hello
I have a big problem and that is that in some cases when repairing active pfc power supplies I cannot work with a test lamp. I can only get help with 5 volts standby and for starting and starting I have to work without a lamp and this way there is a possibility of parts exploding and other parts being added.
Sometimes with a multimeter test the problems can be reduced to some extent, but I had several cases that had to be tested on and online and recently two varistors exploded. They had terrible resistance because the power supplies were over 800 watts.
Is there a way... -
Hello.
GPU came in, green lines. Spent lots of time using to get the Mats / mods drive working (found on youtube).
Found issue with a RAM block
Replaced, green lines gone.
Trying to test again, assuming getting the false positive. Originally had over 1K on a single bank. Now getting tosses low between banks.
Used a good card to test and same results low errors 32+.
I am just search for some form of command to do a full test on the GPU.
I just ran the mats command with my good GPU and passed after roughly 40 min.
The repaired one, ran...
Leave a comment: