Philips 47PFL7403D/10

[vazaki]

Re: Philips 47PFL7403D/10

Here are the other pics.

R5 has been changed and burnt again. Its value is 120Ω 1W

U101 is freezed as dick_barton have correctly noticed on earlier post

[Davi.p]

Re: Philips 47PFL7403D/10

With only a picture you could be helped only by a knowledged man about this model..

[tvtimmy]

Re: Philips 47PFL7403D/10

Is it just me or does the soldering on these parts look bad?
D232
D232a
Q231
D230
Pc102
Pc201
D106a

[budm]

Re: Philips 47PFL7403D/10

Is this the same board?
http://www.shopjimmy.com/philips-272...pply-unit.htm#
Philips 272217100571 (2300KEG033A-F) Power Supply Unit.
MFR Part Number 1: Philips 272217100571
Board Number(s): 2300KEG033A-F, PLHL-T722A 2722, 171 00571
Substitute Parts: 272217152611, 272217100571 Repair Kit

R5 is used to supply B+ (rectifiers D101A~D) to run the standby SMSP IC U101, once the TV is power sup, the B+ will be then supplied by the main power supply through D160, 160A., once the main power supply relays are on then R5 is no longer in use, if B+ through D160,160A is not present and the main board will try to pull full current from STBY supply, then R5 will burn up, that R5 is used just enough to supply enough current to run the main board through R5, once full power is required, R5 is no longer used in the circuit due to reverse bias of D101A~D.
So something is drawing too much current through R5 and causes it to burn up, U101 is one of the load.
The RCD snubber for the U101 is OK? The rectifiers D111 in the cold side is OK? D101A~D, D160, 160A OK?

[vazaki]

Re: Philips 47PFL7403D/10

Thank you Budm.!

The part number of the board is exactly the same as you mentioned.
Board number is PLHC-T801A(UD)

Does Philips sell repair kits for this board? (272217152611, 272217100571).

D101A~D have been replaced. D160 & D160A are good.
Also there have been replaced:
> D111
>Pc201
>Pc102 & 101.

After all these, relay clicking and after a minute again R5 is blown again.

Snubber you mean GR8? the small transformer?
If you mean the transformer I checked it with blue ring tester. Primary is fine but secondary is bad. Is it a problem?

[vazaki]

Re: Philips 47PFL7403D/10

Is it just me or does the soldering on these parts look bad?
D232
D232a
Q231
D230
Pc102
Pc201
D106a

Thanks for your post!

Checked again! All are fine.
D232 D232A D230 & Q231 are desoldered for checking purposes!

[dskall]

Re: Philips 47PFL7403D/10

I would try removing transformer and see if you still have problem. Whichever U101 is driving.

[budm]

Re: Philips 47PFL7403D/10

RCD snubber;
D106A
R104
Blue disc cap C120?? next to R104.

[vazaki]

Re: Philips 47PFL7403D/10

Checked the c120 it should be 10nf but I measure 5,5nf.

I will try to desolder the transformer and measure it again.

To give circuit a try I have to reorder again U101

What about d106a? The type of this diode is T2D 83. Checking with multimeter is seems open both sides. Is it normal situation? I tried finding specs but i didnt find anything. Is it a high voltage diode?

[budm]

Re: Philips 47PFL7403D/10

It is back to back diode so you cannot test it with your meter.https://www.badcaps.net/forum/showthread.php?t=43724

[vazaki]

Re: Philips 47PFL7403D/10

The small transformer is desoldered.
In the primary it has two windings. Both tested with blue ring meter and both are good.
The secondary has one winding, tested but according to blue ring meter it is bad.

Is it possible? The transformer seems in very good condition without signs of burnt or smell.

Any opinions?

[vazaki]

Re: Philips 47PFL7403D/10

Another photo

[Davi.p]

Re: Philips 47PFL7403D/10

It's a very strange circuit for me.. why there is an auxiliary output of main transformer T201 that feeds st.by psu togheter with supply from PFC-out??

[vazaki]

Re: Philips 47PFL7403D/10

Philips TVs are very crotchety.

Do you know where I can buy such transformer?

[Davi.p]

Re: Philips 47PFL7403D/10

I don't know, but i'm not sure about the value of R5, if the fourth band would be yellow and the third purple it was 1,27M but it would be strange for the use, if the fourth would be gold the value is not 120ohm but 12,7ohm or 12ohm (third black)... i expect very rarely the transformer going bad.. whatch shopjimmy picture, it has 5 bands.. i don't even know why this resistor is there..!! But i'm not expert.. finally, i've already seen resistors with band with a strange gold colour..

[dskall]

Re: Philips 47PFL7403D/10

Try powering it up without transformer thru light bulb for fuse see if board is still shorted. What is resistance of secondary?

[vazaki]

Re: Philips 47PFL7403D/10

Try powering it up without transformer thru light bulb for fuse see if board is still shorted. What is resistance of secondary?

The secondary of the transformer is zero ohms. I have tested it with blue ring tester and it looks bad.

I have to order again fsq510 to test it with light buld.

[vazaki]

Re: Philips 47PFL7403D/10

I don't know, but i'm not sure about the value of R5, if the fourth band would be yellow and the third purple it was 1,27M but it would be strange for the use, if the fourth would be gold the value is not 120ohm but 12,7ohm or 12ohm (third black)... i expect very rarely the transformer going bad.. whatch shopjimmy picture, it has 5 bands.. i don't even know why this resistor is there..!! But i'm not expert.. finally, i've already seen resistors with band with a strange gold colour..

R5 color code is Green, yellow, brown, red, brown. I have found a pic on the net. Possibly we are talking about a protective circuit resistance.

I agree with you about transformers gooing bad but is this an exception?

[Davi.p]

Re: Philips 47PFL7403D/10

About R5: since the most outer band is green, the first to count is the brown, please watch shopjimmy picture, the R104 near the little transformer T101, seems to have 2 types of yellow, like many other circuits i've found, i think the darker one is a yellow that stands for gold, so you have brown, red, brown, gold, green then 12,1ohm. Start from this.. why R5 blew i don't know..

[vazaki]

Re: Philips 47PFL7403D/10

Thanks David

I checked the circuit and I noticed that also R4 and R2 has the same colors. I desolder one of these and I measured 120Ω.

It is very strange thing about the color code they use for these resistors.