Re: 47LW6500 Debug Help - Power Board or Mainboard?
Thank you all! Ordered it, hopefully it will work. Will keep you posted.
dannysporea
Member
Last Activity: 05-07-2020, 06:23 AM
Joined: 04-30-2020
Location: Fairfax, VA
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
Yes, the service code on the back cover is 47LW6500-UA.AUSYLUR as well as on a sticker on the main board that includes the different number EBR74235304....Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
How did you figure out if it was a match or not? Just in case others show up I'll know how to check if they can be compatible even if having different numbers......Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
Not sure which one is the correct number... but here is everything:
LC470EUF
(SD)(F3)
470AAP6K0013Y K31B
LIGHT GUIDE: >PMMA<
6091L-1851A 110928 PNL J7519UHHWNLP2AAZ1851A1GB0...Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
Does not seem to be quite exact the one I have:
EAX63969204(0) vs EAX63969205(0)
EBR73358205 vs EBR74235304...Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
Thank you for confirming this. I was searching online for a replacement board, but was not able to find any... so I think my options are either baking it or trying a mail in board repair service. Has anyone used one of these services or know a trusted one?...Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
PANEL_CTL on the base of Q505 barely changes voltage when toggling TV on and off: 0.6V when off and 0.63V when on....Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
So here is what I am seeing on the T-CON's voltage circuit on the main board:
Q505
- B - 0.628V (PANEL_CTL)
- E - 0V (GND)
- C - 0.03V
Q506
- B - 0.03V
- E - 0V (GND)
- C - 12V
Q507
- D - 0V (PANEL_VCC)
- S - 12V (from L511)
- G - 12V
Does this make sense to you? I am not sure what PANEL_CTL value should be, but the D pin on Q507 should be 12V in order to power the T-CON board.
Thank you.Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
Yes, no voltage getting to T-CON board at all. Nothing on the mainboard side either, so the cable cannot be blamed....Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
No video on the screen with flashlights. 0V on the F1 fuse on the T-CON board, as well as P3501 on the mainboard side....Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
Thank you. Any ideas on how to figure out which component is the cause?...Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
If I had an electric oven, I would try it as a last resort, nothing to lose... unfortunately mine is gas. And I still want to try to pinpoint the point of failure on the board if possible. I may be able to solder it back on if it was large enough and not requiring a heat gun or micro soldering....Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
Unfortunately I don't have a hot air station, nor did any micro-soldering before... I was planning on trying to find a replacement board once I identify the culprit. Does this look to you that the power board is good and the main board is bad? DRV_ON seems to be very low at 0.03V, so this would support this....Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
Ok, here are the values for P201.
[U]Standby[/U]
[CODE]
23 - N.C -> 0V | 24 - ERROR -> 0V
21 - 12V -> 0V | 22 - PWM -> 0V
19 - 12V -> 0V | 20 - N.C -> 0V
17 - 12V -> 0V | 18 - DRV-ON -> 0V
15 - GND -> 0V | 16 - VSYNC -> 0V
13 - GND -> 0V | 14 - GND -> 0V
11 - 3.5V -> 3.52V | 12 - 3.5V -> 3.52V
9 - 3.5V -> 3.52V | 10 - 3.5V -> 3.52V...Last edited by dannysporea; 05-01-2020, 03:43 PM.Leave a comment:
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Re: 47LW6500 Debug Help - Power Board or Mainboard?
Should I look for a spike on each pin when hitting power, or just the final reading after power on?...Leave a comment:
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47LW6500 Debug Help - Power Board or Mainboard?
Hi all,
My TV suddenly stopped working and when trying to turn on, just the standby lights come up and the screen does not light. I opened it and tried to debug based on a training manual I found on these boards for a similar TV, but the voltages do not match so I am not sure how to identify the problem. Here is some info:
LG 47LW6500-UA
Power Board: EAX62865401/8 / EAY62169801
Main Board: LA12C / BCM35230 / EAX63969205(0) / EBT61399411
So here is what I did so far:
[U]TEST1[/U]
- Removed P502 on the main board...Last edited by dannysporea; 05-01-2020, 01:59 PM. -
Re: New Members - please post your introductions here
Hello all!
Looking forward to learn more about debugging electronic boards. Long time reader of this board, looking for some help
Thank you!Leave a comment:
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