Re: Philips 40PFL4707 SMPS fuse blown.
@budm
can you pls let me know your views. The TV is working fine. After many test attempts the boot loop is not seen even once.
I plan to put back the back-cover and send this TV to regular use.
genuineguy
Member
Last Activity: 11-03-2020, 10:40 PM
Joined: 09-20-2015
Location: pune
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Re: Philips 40PFL4707/F7B has sound, but no picture
do you have pictures of the LED strip in the TV ?Leave a comment:
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Re: Philips 40PFL4707 SMPS fuse blown.
Very happy to get your attention budm. Here the readings
P-ON +12/21 ----------- 890 ohms
ALL +3.4/5.3 ----------- 700 ohms
AMP + 24 ----------- 940 ohms
LED+24V ----------- 296 ohms
P-ON+24v ----------- 295 ohmsLeave a comment:
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Re: Philips 40PFL4707 SMPS fuse blown.
Good results. External connection of 24V supply was success. The TV no more got into bootloop. It turned on and worked for several hours.
My analysis seems was correct.
To solve the problem with out external 24V supply, I connect two electrolytic capacitor of 2000mfd to the LED+24V line ( there were two existing 1000mfd capacitor).
The boot loop has disappeared and TV starts perfectly.
Several forums on google suggested the bootloop is a firmware issue but atleast for my TV, it turns out to be...Leave a comment:
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Re: Philips 40PFL4707 SMPS fuse blown.
Experiment log
I suspect LED+24V in the SMPS is not holding on to 24v when the boot starts and backlight LED are turned on. If it does not hold on and drops, it will pull the protect3 line low and the CPU will get in protected mode.
I will try connected a separate 24V supply to the LED driver board instead of the TV SMPS.Leave a comment:
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Re: SSL400_OE2D REV0.0 technical details ( Philips 40PFL4707)
Found from another thread on bad caps that this board also has part # LJ97-00229A in some other TV models.Leave a comment:
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Re: Soniq Smart TV, No Backlight.
Hello
I have been searching for some voltage references for this LED driver too.
What is the significance of 1.6V on CN2 labelled as V_sync ? It connects from the LED driver into the samsung panel TCON board of my 40PFL4707Leave a comment:
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SSL400_OE2D REV0.0 technical details ( Philips 40PFL4707)
Hello
My philips 40PFL4707/F7 has a LED driver board SSL400_OE2
I am looking for technical details / data sheet or any information. Nothing available on google.
If some one has at least the pinout voltages for its connectors CN1, CN2, CN3 kindly share. -
Re: Philips 40pfl4707/f7 problems
whiz62 Glad you solved the issue
If you are still interested, take a look at my posts and i have uploaded the service manual for this TVLeave a comment:
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Re: Philips 40PFL4704 dead
This looks like 40PFL4707. I am working on repair of this TV for last 4 years now
. Its become my favourite past time hobby. Incremental progress.
If you find source for these ribbon cables, do let me know too.
Here are my suggestions. Look at my thread. I have attached service manual for this TV. You should check following voltages
AL+3.3v
LED+24v
P-ON+21v(12v)
Pin 3 of IC3008, IC3001, IC3003
Also check the voltages on CON3 on LED driver board for LED-1, LED-2, LED-3,LED-4..it should...Leave a comment:
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Re: Philips 40PFL4707 SMPS fuse blown.
Experiment Log
1. Noticed IC3003 voltages not normal. Its a 5.5v regulator and takes P-ON+21v(12v) as input. During normal operation, Vin=12v, Vout = 5v, EN=3.3 to 4v. This is expected.
If I turn off the power switch on the TV, Vin=3.3 Vout= 0.8v EN=0v. This is not expected. If EN=0, the Vout should be 0v. This indicates slight malfunction of MP2305 IC3003 regulator. I have connected a 1K 1W resistor from P-ON+5v (Vout of IC3003) to gnd. This has made a positive effect. The Vout is now 0.22v. ( should go to 0v but it doesnt)...Leave a comment:
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Re: Philips 40PFL4707 SMPS fuse blown.
uploading the service manual for this TV for reference...Leave a comment:
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Re: Philips 40PFL4707 SMPS fuse blown.
Experiment Log
Decided to study the various pin voltages to get some clues
1.Mains power turn off.
2.All voltages dropped to zero except AMP+24v and AMP+21v( its actually AMP+12v). Both gradually went down and took several seconds to come to zero.. may be 30 sec. Power on and the TV started nicely. No boot loop. I think the AMP+24v and AMP+21v should go down to zero in 1 or 2 sec max. I suspected some of the resistors may have gone higher in resistance
3. R210 is 22K. Connected a new resistor 1.2K 1W in...Last edited by genuineguy; 10-15-2020, 08:53 AM.Leave a comment:
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Re: Philips 40PFL4707 SMPS fuse blown.
Experiment Log
1. The boot loop continues to be an issue. At times the philips logo shows up once and then the screen goes blank. Nothing happen. Power off-on cycle is required to get to the logo again. Some times the philips logo shows in loop ... 3 times.. 4 times or even 10 times before the screen goes blank and loop stops
2. One wierd method I found to get the TV working. If I keep the TV power cable connected to the power socket on the wall and power switch OFF, overnight.. next day morning I turn on power...Leave a comment:
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Re: Philips 40PFL4707 SMPS fuse blown.
The current experiment log
1. Removed all connectors. Cleaned all three pcb with liquid cleaner. Cleaned all connectors externally and internally ( holes) using painting brush. Allowed everything to dry.
2. Reconnected
3. Started. This time, went past the Philips logo. I could connect a macbook via HDMI and play youtube videos on the TV for ~1 hours.
4. Using remote, entered service mode and initialized ( factory reset) the TV
5. For 1 hours of proper run, measured voltages. LED+24v was showing properly...Last edited by genuineguy; 10-11-2020, 06:50 AM.Leave a comment:
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Re: Philips 40PFL4707 SMPS fuse blown.
After 3 years, I am back to the same forum with the same TV..
After my last post, the TV worked for few days and then had the same issue - Power On, philips logo, shutdown.
Kept the TV aside for another vacation experimentation. Never got time.
Last week, decided to give one more try... I see the following sequence
1. Mains power on
2. Front panel white led blinks 6 times
3. Philips logo display
4. TV shuts down immediately
5. Nothing happens
6. Have to power off and...Last edited by genuineguy; 10-10-2020, 07:58 AM.Leave a comment:
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Re: Microwave Oven Capacitor Testing
Turns out the capacitor was indeed faulty. I got a new one and the microwave oven is working. I had to replace the magnetron too. Hopefully this sustains and does not fail again.Leave a comment:
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Re: Microwave Oven Capacitor Testing
I connected the diode in series with the 100w bulb. The bulb did light up, it was flickering and somewhat half the brightness than a normal 230v connection. I recognise this light as I have connected diodes in the past to 100w bulb. so i am concluding the diode is good.
I also used a 12V battery to connect to the diode and test using DMM. The forward reverse test did succeed.
So , the diode appears good to me.
I am doing this experiment to confirm my capacitor is good or bad. I do not have a new capacitor. Looks...Leave a comment:
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Microwave Oven Capacitor Testing
Hello Experts
Need help with my experiment to test a Capacitor from microwave oven
Its a High voltage capacitor. 1mfd, 2100V AC.
A DMM test across its terminals show infinite/open resistance.
The capacitor has a 10Mohms shunt resistor internally.
1. Connected 100w bulb in series to the capacitor. AC supply 230v connected. The bulb did not light up. This proves the capacitor is NOT shorted
2. Connected capacitor in series with a diode and 10ohm, 10W resistor. Connected AC supply 230v. I was hoping DC voltage reading... -
Re: Philips 40PFL4707 SMPS fuse blown.
Some more updates.
I left the Tv running for another 12 to 15 hours non stop over night. Post that the TV is properly working. No more power off/stuck at the philips logo. I tried it several times and same result. I even turned off mains, waited for 30min and got perfectly working TV. no more boot loops.
I will keep it mains off for 12 hours to let it cool and try again. hope it works.
Not sure what happened. If it was a software glitch, may be the microprocessor got its counters reset properly in 12 hours continuous...Leave a comment:
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