Re: What is this SMD component?
Its for a HP 15-DB0011DX
HP Motherboard part#L20478-601
PCB# EPV51 LA-G078P, Rev. 1.0
73buick
Member
Last Activity: 04-14-2021, 04:52 PM
Joined: 03-03-2011
Location: New York
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What is this SMD component?
Does anyone know what the SMD CL2 is in this pic? It looks like a fuse, but not sure. Can't find anything on what CL stands for. It is currently reading at 0 ohms and has no continuity.
Just fixed this laptop for a client and it worked for a few days and now won't power up. Getting 19V out of the DC jack harness, but only 1V on the battery charge pins. Just trying to narrow down what it could be and came across this CL2 piece which I thought was a possible fuse.... -
Re: Sharp LC-52LE830U no backlight
Okay, I got it into the service menu. Only problem is now I think I do need the remote as the instructions say to press OK after highlighting the L ERR RESET line, but there is no OK button on the set and the service manual says OK is just on the remote.Leave a comment:
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Re: Sharp LC-52LE830U no backlight
All test same now, 70-72V using the LED powersupply/tester.Leave a comment:
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Re: Sharp LC-52LE830U no backlight
Okay, so I got the new LED strip in. Plug in, still on lamp error. Do force start and it turns on and lights up good. I can go into menu settings, etc, looks good. Unplug and plug in again, still on lamp error blinking. Force start, go into menu and do a reset. No change. Look up and see it probably needs to go into service mode to reset the lamp error code. Instructions I find online and in the service manual say to push Vol- and Input buttons on TV, then hit power and keep the first two pressed until I see the K icon show up. I have tried over...Leave a comment:
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Re: LG 42LN5200-UM vertical bars
No scope. The bars do coincide with using the remote, i.e. no bars when first turned on. Hit menu on the remote, those bars show up. Try to blindly navigate menu, bars change.Leave a comment:
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Re: Sharp LC-50LB370U no backlight
Will do. And just to be clear, the test I did was with a LED test power supply, testing on the pigtail connector itself directly to the LED strips. I realized that wasn't clear in my post.Leave a comment:
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Sharp LC-50LB370U no backlight
Got picture and sound, no backlight. Unplugged backlight connector and tested VLED1+/- and VLED2+/- using LED tester. VLED1 lit up, 71V steady. VLED2, no lights and tester never dropped voltage. Sound like VLED2 circuit is bad, correct? Looks like known issue on this model, too.... -
LG 42LN5200-UM vertical bars
Turn on TV, displays these wide vertical bars. Thinking bad TCon, got a new one from shopjimmy. Just put it in, and still doing same thing. Assuming now either bad main board or bad bonding to the panel. Here is a pic. TV was located in an enclosed outdoor porch.... -
Re: UN40H6203AFXZA not turning on
I just got an LED tester. On this one, if I use the tester directly on the LED plug, would I need to do put the probes on D2+ to D1- and D3+ to D2-? What about D1+, would I do negative probe to ground?Leave a comment:
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Re: Sharp LC-52LE830U no backlight
Okay, so I believe I confirmed bad LEDs. Using the LED tester, I unplugged the LED connector and tested LED1+/- through LED4+/-. LED1,3,4 are tested at around 70-72VDC and I could see areas of light brightening up on the screen. LED 2 at first went to around 85VDC, then after a few tests the tester just would drop from the default 327VDC to maybe 323VDC, a couple times would flucuate from 130 to 260 and back and forth, so I am assuming that LED string is bad.Leave a comment:
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Re: Sharp LC-52LE830U no backlight
Bump. I have an LED tester on the way, too, just in case.Leave a comment:
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Re: Sharp LC-52LE830U no backlight
Okay, so I went and tested everything again. I had my intern doing it before and wanted to just do it myself. I did each test twice to confirm readings. So starting with TV unplugged and LED connector plugged in.
Plug in TV, lamp error flash and 0VDC on LED1-4 +/-.
Force power on: Relay clicks. LED1-4 +/- will jump about a tenth of volt for a second. After about 25-30 seconds, LED1-4 + jumps to 140VDC for a second, then relay clicks again, voltage drops by half and continues to drop and lamp error flash returns. LED1-4...Last edited by 73buick; 07-27-2018, 04:49 PM.Leave a comment:
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Re: Sharp LC-52LE830U no backlight
Sorry, same readings for the others, too.Leave a comment:
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Re: Sharp LC-52LE830U no backlight
Bump. Bad LED?Leave a comment:
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Re: Sharp LC-52LE830U no backlight
Okay, did it again. These readings are going from lamp error state to forced start up state. Probes are set on pins from the get go.
LED1+: Takes 3-5 sec from the relay click to jump to 140VDC for a second, then starts dropping. After about 10 sec, its around 20-40 VDC and still dropping.
LED2+: Same
LED4+ Same
LED1-: Again about 3-5 sec from the relacy click and jumps to about 70VDC for a second and starts dropping right after.
LED4-: Same
With LED connector off, +/- pins stay...Leave a comment:
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Re: Sharp LC-52LE830U no backlight
The first time I wasn't measuring right away. Not sure if that would make a difference. I am going to test again both ways to be sure.Leave a comment:
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Re: Sharp LC-52LE830U no backlight
Here is the board in question. Just did this test. Plugged in, lamp error flash. Meter on LED1+, 0VDC. Leaving probe on LED1+, did a force start. Meter stayed at 0VDC. Tried on LED2+ as well, same thing....Leave a comment:
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Sharp LC-52LE830U no backlight
Getting the one long one short blink. If I do the force start, I get picture, but no backlight.
With above and LED connector plugged in, meter on LED1-4+ starts at 40VDC (maybe higher, but that is after 5-10 seconds after the force start) and then slowly drops stays around .1VDC. LED1-4- show 0VDC.
With unit off, ohm reading on LED1-4+ are about 2.7MOhms, LED1-4- around 1.9MOhms.
LED connector unplugged, ohm readings off PSU board pins the same. Power reading, this time on LED1+ I caught it starting at about 120VDC, but again slowly was dropping. ... -
UN40H6203AFXZA not turning on
Have this TV in for a client. Plug it in, standby light blinks 3-4 times, thats it. TCon LEDs light up. Oringinally thought it was the main board. Bought one used on ebay, looked sketchy out of the box, real dirty, etc. Plugged it in, standby comes on steady, but just starts blinking after hitting power button. TCon LEDs never come on. Put original main back in and start looking at power board. Okay, so with main board disconnected and LED connected, I get 177VDC on D1+, 0VDC on D2+ and D3+. Unplug LED, same readings. LED connected, 15MOhm on D1+, 0 on D2+ and D3+. Unplug LED, D1+ starts at about...
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