Re: 17PW26-3 Issue: Flashing Blue Light on TV
Will reply tomoz busy tonight.
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
found this on another thread check between pin 6 and 8 for sc
A blinking LED in any other case than firmware update is mostly a power supply issue, but here's our checklist:
Check microfuse FS105 on main board, near CAM module.
Check SMD fuse FS106 (4A) for open-circuit. Check diodes D881 and D893 (UF5402) for short-circuit.
24V rail might be short-circuit, disconnect inverter board supply to prove. Check and replace dual N-channel MOSFETs IC803 and IC804.
Replace IC830 (FAN7711 and SMD capacitor C925 (1nF).
Check for short-circuit between pin 6 and pin 8 of IC830 (FAN7711). Replace IC830 and SMD capacitor C833 (100nF).
Check and replace SMD transistor Q839 (BC859).
Check D893 and D891 (UF5402) in centre of PSU for short-circuit.
Voltage at regulator U122 varies between 4V and 9V instead of being stable at 8V. Replace U122 (LM1117ADJ) on main board.
Check C961 (470uF/35V) at top of PSU.
Check D893 and R1036 (2.2K) on PSU.
Replace IC830 (FAN7711).
Check D893 and its feed resistor. Replace MOSFETs Q813 and Q814 and IC830. Replace C828.
Replace C892 (100uF), C801 (33uF), C840 (33uF).Leave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
Ok but how to test FAN7711 with a multimeter? Possible?Leave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
with boards being this cheap though it maybe cheaper to buy this than buying ics etc
http://www.ebay.co.uk/itm/Power-Boar...0AAOSwAYtWKlXH
unless your like me and enjoy the challenge of fixing itLeave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
+1 They are the FAN7711 and components around it.
I would agree with vincerogers69 and suspect that this is where the fault lies.Last edited by dick_barton; 07-23-2016, 09:08 AM.Leave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
this is whats in the repair kit maybe check all these parts too
F800
Q813
Q814
IC830
D894
R860
R8661
R971
C840Leave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
The PFC is working so it may be a problem with the FAN7711/ Q813/Q814 which drive the primary of the transformer.
Have you checked all the diodes in the output stage. Q827, Q816, Q815, Q828, D881, D893Last edited by dick_barton; 07-23-2016, 08:58 AM.Leave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
It may be a fault in the secondary sideLeave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
Not sure why you have not got 12 or 24 volts though maybe budm has some ideas where to check nextLeave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
With the power supply disconnected from the main board what voltage do you have at the output connector when you switch on.Leave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
If you have 387V across C819 and the circuit is for your power supply then that's fine.Leave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
The 387V looks OK but you've said both 387V and 235V??
The 387V looks like the boost voltage which you need in order to have the secondary supplies.Last edited by dick_barton; 07-23-2016, 08:32 AM.Leave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
Oh! DC? Across large cap I get 387vdcLeave a comment:
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Re: 17PW26-3 Issue: Flashing Blue Light on TV
What voltage do you get across the large filter capacitor?Leave a comment:
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