Yes the Problem was solved. I tested the LED stripes and i found one dead LED. The device worked well after changing the LED Stripe
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Foppel
Senior Member
Last Activity: 08-08-2019, 08:09 AM
Joined: 01-02-2013
Location: NRW
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Re: Samsung UE32F5370SS / UE32F5570 / UE32F5070 LED - No Backlight
Yes the Problem was solved. I tested the LED stripes and i found one dead LED. The device worked well after changing the LED Stripe...
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Re: Marantz NR1501 HDMI Board CHK CPU Error
Hi @mg37,
thank you for the reply. I also changed the caps near IC1606 but in my case nothing changed. But it will help if you have a disgusting noise at cold start, see: [url]http://www.avsforum.com/forum/90-receivers-amps-processors/1187880-official-marantz-nr1501-slim-receiver-owners-thread-12.html[/url]
In my case something with the grounding was faulty. Sometimes the 5V rail from the Mainboard will geht down to 2V! I spended so much time for repair, but in the end i sold the device on Ebay. I spoke with a...Leave a comment:
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Re: Marantz NR1501 HDMI Board CHK CPU Error
Thank you CapLeaker. But it was not the wrong voltage. I just used the wrong Ground. Now i have 9.05V at the 9V voltage regulator. I think something is wrong with the grounding. AVSS from AK4588 should be connected with the GND from IC205. But then the AK4588 will get hot in a few seconds and the voltage at IC201 is dropping down to 2.xxV. If i connect the AVSS to the GND from the IC201 the 5V Rail is stable at 4.95V. Sometimes the firmware information will be displayed sometimes not. I have the following firmware:
Menu...Leave a comment:
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Re: Marantz NR1501 HDMI Board CHK CPU Error
If i remove the Video Board and go into service mode the device shows me CHK DSP. And the HDMI Firmware Version will be displayed. When i reconnect the Video board i still get the error CHK CPU and the HDMI Firmware Version is not displayed. I think the sub mcu IC1401 is ok. When the device is powered up the output 26 is high and will enable the 3.3V power regulator IC1006. I will measure the communication ports at the Connector CN1003 9-16. But i think the source of the problem is the IC1301.
I have only 7.5V at...Leave a comment:
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Re: Marantz NR1501 HDMI Board CHK CPU Error
Thanks Khron666 for the hints. I checked all the caps but they are all good. I also use my scope to check for ripple but nothing. Everything was OK. But i have a little pump at the oscillator XTAL1301 from the IC1301. Do you think it is related to the problem? Thanks in Advance:
Here is the Video from the scope:
[url]https://www.youtube.com/watch?v=0qMo0UUIYgU[/url]
best - FoppelRe: Marantz NR1501 HDMI Board CHK CP... caps but theyLeave a comment:
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Re: Marantz NR1501 HDMI Board CHK CPU Error
Hmm i checked all the caps and resistors near the CPU's but they are all correct. But at the IC1401 the 10nF Caps are a bit low. I get the following results:
C1405 8,5 nF
C1406 8,7 nF
C1407 8,7 nF
At the IC102 i get the following:
C261 10 nF
C262 11nF
C263 11nF
Will it help to change the caps at IC1401? I think i will give up soon. The last thing i try is to power up the 3,3V from my lab power supply and check all the VCC Points near the CPU with an...Leave a comment:
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Re: Marantz NR1501 HDMI Board CHK CPU Error
OK now im sure it's not the AK4588. The problem was the missing ground at AVSS PIN 56. If i connect this PIN to GND the power consumption is about 100mA and i think this is OK. But i still get the Error CHK CPU. I tested all the caps near the regulator IC's but they are OK. I also checked the DATA and CLOCK Lines between the Main and Sub CPU. How can i test I2C communication? Does it work with an Arduino? I can not find the Datasheet of this IC1401 (M3030RFEPFP). I think i will resolder the CPU and SUB_CPU. The problem is i can not find...Last edited by Foppel; 01-03-2015, 05:03 AM.Leave a comment:
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Re: Marantz NR1501 HDMI Board CHK CPU Error
Hi Khron666,
thanks for your posting. If i desolder IC1501 AK4588 then the power consumption of the board is around 70mA at 5V. The KIA7805API has a maximum ouput current of 1,5A at 5V. Is it possible to test the AK4588?
I think the polish guy has the same problem:
[url]http://www.elektroda.pl/rtvforum/topic2722389.html[/url]
I think after he changed the AK4588 the device is working again.
P.S. I also changed the transistor Q215 on the main board but nothing changes....Leave a comment:
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Re: Marantz NR1501 HDMI Board CHK CPU Error
I powered up the HDMI Board with 5V from my lab power supply limited to 500mA. Then i recognized a warm/hot AK4588 IC1501 CHIP. I ordered a new one from china and changed the AK4588 but i still have the same error. The new chip will also heat up and the voltage will drop. I desoldered the chip and connected 3,3V and GND directly to the IC. But still the same. The chip heat up and get hot in a few seconds.
The question is: Do we have a defective IC AK4588 or is it related to another part?
The AK4588 datasheet...Leave a comment:
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Marantz NR1501 HDMI Board CHK CPU Error
Dear all,
i need help with a Marantz NR1501 Audio Receiver. The displayed error message was CHK CPU. The analog Audio Part is working, the digital audio part not. The Service Manual says that some voltages on the HDMI Board are not correct. I checked the voltages on the CN1101 connector:
5V to GND -> 4,95V
3V3 to GND -> 12,7V
My question is why do i have 12,7V on the 3V3 Pins? Maybe a shorted Q215 on the Mainboard? What is the function of the Q215 transistor on the Mainboard?
The reading of the output from the both Buck Regulators... -
Re: Samsung UE32F5000AK sound ok, no picture.
I had the same problem with a Samsung U32F5570. I bought a tv with smashed screen and replaced the complete LED Backcover. You can give us the BN number of the stripes. In my case they was BN41-02032A (LED Interface FHD32" Sharp). I tried to desolder the faulty led. But it wont work for me. This flexible stripes are hard to solder...
[url]https://www.badcaps.net/forum/showthread.php?t=41382[/url]Re: Samsung UE32F5000AK sound ok, no... I bought a tvLeave a comment:
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Re: Samsung LE37B650, gamma?
Dear all,
thanks for this thread. I repaired my LE37B650T2P with the same problem. It was really hard to remove the old AS15-HF Chip. I tried with my rework station from two sides, but no way. Then i used a dremel tool to remove the chip. It worked for me. I removed two little pads from the board
Then i used two little wires to connect it directly to the chip. I tested the tv and everything is working fine. I ordered a cooler for the raspberry pi to use it with the AS15....
Last edited by Foppel; 11-04-2014, 06:45 AM.Leave a comment:
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Re: Samsung UE32F5370SS / UE32F5570 / UE32F5070 LED - No Backlight
Damn after i changed the LED Background i smashed my LCD
I found one faulty led in the non working backlight unit (open circuit). And yes they are all in series
The led driver is about 160V / 320mA. I counted 45 LEDs. 160V / 45 LEDs give me a voltage of 3,55V for every LED. The current is always the same 320 mA. That means you need a Lab Power Supply with 32V to test the stripes. I use my 20V Lab Power Supply to test the stripes. 21 V was okay to test 8 Leds in Series. If you dont have...
Leave a comment:
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Samsung UE32F5370SS / UE32F5570 / UE32F5070 LED - No Backlight
Dear all,
i try to repair a UE32F5370SS with a non working LED Backlight. I checked the voltage for the LED's at the cap. I got 180V. The LED Voltage was 160V. I bought another TV with smashed screen for spare parts. Try to change the Power Supply and the Mainboard and all the cables => Same Error. Now i disassembled the Panel and try to swap the LED Backlight from the Smashed Screen to the other one. The Backlight unit was easy to disassemble. I will check the non working Backlight unit and will post the result here.
Mainboard: BN41-01958B
Power Supply: BN44-00607A... -
Medion MD30045 HDM9L-V5.2 Picture freezes after 5-6h
Dear Badcaps Members,
i repaired a Medion MD30045 37" Flat Screen TV. The Picture freezes after 5-6h power on. I use my oscilloscope to check the voltage regulators on the left hand side. There was a lot of ripple noise at the output of the upper LT1084. I desoldered the two filter caps (47uF/16V/105°) and i measured a ESR of 9 Ohms. I replaced all the caps on the left hand side an now the ripple is gone
Board: HDM9L-V5.2
Power Supply: FSP270-4M02 P/N: 3BS0134113GP
Inverter: DARFON V183 4H.V1838.411 /B1
More Pics: [url]https://plus.google.com/photos/112556810584672853030/albums/5861815222332542657[/url]... -
Re: lg lcd42lc7r-ta
You can check the voltage regulators. Here is a good video: [url]https://www.youtube.com/watch?v=cNFzBJELFoU[/url]
Read the FAQ: [url]https://www.badcaps.net/forum/showthread.php?t=25836[/url]
best regards - FoppelRe: lg lcd42lc7r-ta<br /> <br /> Y...gards - FoppelRe: lg lcd42lc7r-ta
You can check theLeave a comment:
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Re: Samsung LE32R87BDX
You can check the caps with an ESR Meter but i think they are ok. You can carefully press with your finger on the BGA Chips and then you can see if its a bad contact.Leave a comment:
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Re: Samsung LE32R87BDX
Hey Dude. I think it's not easy to remove the cover. But you can check the soldering spots. But sometimes the BGA chips lose the contact with the board and this is really hard to fix
I tried to fix a bga processor from an Nintendo DS with a reflow soldering station. But i use too much heat and the CPU died ;( Good luck
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Re: Samsung LE32R87BDX
Have you tried to resoldering and cleaning the glued Transistor QB802? You can use Isopropanol to clean the Transistor. See: [url]https://www.badcaps.net/forum/showthread.php?t=22470[/url] Maybe you can use a heat gun (or hair dryer) and Cooling Spray to locate the faulty parts.
schematic: [url]https://cdn.badcaps-static.com/pdfs/6701b1e5009ff5ae09f98cb225f06d1f.pdf[/url]
Please give us a picture of the bottom side of the board. Maybe we have bad soldering spots.Re: Samsung LE32R87BDX<br /> <br />...to resolderingLast edited by Foppel; 03-02-2013, 07:32 AM.Leave a comment:
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Re: Samsung LE32A437 power problems
Thank you guys. I fixed mine also with recapping and resoldering QB802. I found this interesting video on youtube: [url]http://www.youtube.com/watch?v=opwR9BMyR7Q[/url]
best regards - FoppelRe: Samsung LE32A437 power problems<...gards - FoppelRe: Samsung LE32A437 power problems
Thank you guys. I fixed mine also withLeave a comment:
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