Re: Vestel 17PW01-4 PS board stuck in standby
It's a 1uF 63v but assume it'll be ok.
No change.
It's a 1uF 63v but assume it'll be ok.
No change.
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Re: Vestel 17PW01-4 PS board stuck in standby
The data sheet for FAN7711 says that normal operation is when CPH voltage reaches 7V.IC500 FAN7711
1 - VDD 14.93v
2 - RT 0.001v
3 - CPH 0.001v
4 - GND
5 - LO 0.542v
6 - VS 13.18v
7 - HO 13.57v
8 - VB 14.91v
After changing the capacitor are the FAN7711 voltages as you gave earlier shown above.Willing to help but I'm no expert.Comment
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Re: Vestel 17PW01-4 PS board stuck in standby
I'm away now till tomorrow PM. Many thanks so far..
But before I go:
IC500 FAN7711
1 - VDD 14.73v
2 - RT 1.762v
3 - CPH 1.3531v
4 - GND
5 - LO 0.000v
6 - VS 13.66v
7 - HO 13.67v
8 - VB 14.93vLast edited by Nevillet; 10-18-2019, 01:15 PM.Comment
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Re: Vestel 17PW01-4 PS board stuck in standby
I'm back now. I feel like we have given this power supply a good effort and it's probably now the time to throw in the towel.. Are we agreed?Comment
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Re: Vestel 17PW01-4 PS board stuck in standby
Can you change IC806 (FAN7711) as the last resort to rule it out as being faulty?
With the diode in backwards then the 12V supply would have appeared to be almost a short circuit.
You've ruled out the two mosfets as being damaged and the supply voltages for the FAN7711 looks good but it cannot be operating since you are not seeing the 12V on the secondary side of the transformer it's driving.Willing to help but I'm no expert.Comment
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Re: Vestel 17PW01-4 PS board stuck in standby
I don't have a FAN7711 in stock.
It's not stocked by CPC/Farnell and RS have it but as a SMD.
There's one on eBay for £3.09 delivered which seems a bit steep but It might be worth a punt.
Now ordered.Last edited by Nevillet; 10-19-2019, 07:34 AM.Comment
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Re: Vestel 17PW01-4 PS board stuck in standby
Good luck. Can't thnk of any more moves. Keep that smd capacitor (11.19uF) in case it needs to go back in. What was it's ESRLast edited by dick_barton; 10-19-2019, 07:42 AM.Willing to help but I'm no expert.Comment
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Re: Vestel 17PW01-4 PS board stuck in standby
The C928 cap measured 9.1uF, ESR 0.00
I'll report back when the chip turns up.Comment
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Re: Vestel 17PW01-4 PS board stuck in standby
The new FAN7711 arrived and replaced the original but unfortunately no changes were seen.Comment
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Re: Vestel 17PW01-4 PS board stuck in standby
That's a pity. Hopefully someone else can offer further assistance and spot what I have missed.Willing to help but I'm no expert.Comment
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Re: Vestel 17PW01-4 PS board stuck in standby
With your help, I've learnt a lot about this board and power supply boards in general. This particular TV had a negative outcome but I'm not overly disappointed. I'll salvage the boards and bin the rest. Sincere thanks.Comment
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Hi All.
I have an 820-02016 board (A2337 M1) that has come in for data recovery. Reported as liquid damage, but no visible evidence of any liquid damage.
Board was initially stuck at 5v, and current only spiking occasionally to around 400mA and cycling.
After initial troubleshooting, found that C7800 (which feeds the power rail PP5V_BSTLQ_VOUT_SPMU) was dead short to ground.
Replaced C7800 and short gone. Board still stuck at 5v. Current draw behaviour changed. It now spikes up for a second to around 100mA to 130mA, then drops down to... -
All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
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Hi friends, working on a MacBook Air A2179 logic board 820-01958-A logic board. It's just stuck on 5V .19amp on one USB-port & then when I use to the other port it's also stuck on 5V .19amp but on this port it resets after few secs & start over with the same said voltage. I assumed that one of the CD3217B12s is defective, & replaced both with known good ICs. The status & result remains the same. I checked for shorts or liquid spill, all clear. On F8400 there is 12v present, but no 5V or 3.3 volts. There are LDO voltages on the both CDs 3.2v & 1.5V. Kindly if someone can help... -
I suppose the real question is whether the existing pinouts from ether a 17IPS71 psu are cross compatible with a 17IPS12 psu? If they are then the exchange of the main boards should have no issues providing the screen is compatible with both main boards. Obviously you can change the screen configurations easily enough (providing you have the correct files) for the main board. Why may you ask would I do this? Well a lot of the smart features are no longer working on a Hitachi 48HBT62U main board I wish to give it a new lease of life!
Obviously the same LVDS connector for the screen connection... -
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....
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