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Dear Expert
The details of my TV is as follows

1. Philips 40PFL4707/F7 Manufactured March 2012
2. SMPS Board BA21P6F01 01 1
3. SMPS board has a sticker that says A21P6MPW C 7219720
4. This is a 110v Mains Supply TV sold in USA
5. I imported this from USA into my country where we have 230V.
6. I have a simple winding transformer that converts 230v to 110v

The TV has been having this problem.  Here are the steps
1. Mains power on
2. Front panel white led blinks 6 times
3. Philips logo display
4. TV shuts down immediately
5. Nothing happens.  If i press power button on TV or remote nothing happens
6. Have to power off and then wait for few minutes to experience same repetition.

Last two days, tried several times, only once the TV started and after 10 minutes it did auto shutdown as there was no input signal connected.

Does this indicate issues with SMPS or main cpu board ? Even if its faulty, how did it start once ?

More testing done as follows
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 at 24v, AL+3.3v was at proper 3.3v and the P-ON-H1 was properly at 3.3v
6. After about 1 hrs, the screen shut down. The LED+24v is showing at 6v, AL+3.3v at 3.3v and P-ON-H1 is a 0v. This indicates the main cpu board has turned off the P-ON-H1 signal.
7. Power off, wait for 2 min. Power on... same philips logo and TV shuts down. Problem repeats.
8. Firmware is Code TVNB010_00_PF_XX91_BA PIC code U10_CM08:_40A_C7W_R_02. Did a google search and found no references if this firmware needs any upgrade.

requesting experts next steps to root cause the issue. I suspect the main board is bad and the SMPS is good. What if I manually put a wire from AL+3.3v to P-ON-H1 ? will the TV be on or is it risky for the main cpu board ?

I am attaching the service manual for this TV

Sziasztok!

A tévé nem ad hangot. Egyik bemenetről sem. Letöltöttem a szervizkönyvet, és

" Service Modes, Error Codes, and Fault FindingEN 12 TCM2.0E LA5.
5. Service Modes, Error Codes, and Fault Finding
Index of this chapter:
5.1 Test Points
5.2 Service Modes
5.3 Error Codes
5.5 Service Tools
5.1 Test Points
This chassis is NOT equipped with test points in the service
printing. No test points are mentioned in the service manual.
5.2 Service Modes
The Service Mode feature is split into different parts:
• Service Alignment Mode (SAM).
• Service Default Mode (SDM).
• Customer Service Mode (CSM).
SDM and SAM offer features, which can be used by the Service
engineer to repair/align a TV set. Some features are:
• Activates the blinking LED procedure for error identification
when no picture is available (SDM).
• Make alignments (e.g. white tone), (de)select options,
enter options codes, reset the error buffer (SAM).
• Display information (“SAM” indication in upper right corner
of screen, error buffer, software version, options and option
codes, sub menus).
The CSM is a Service Mode that can be enabled by the
consumer. The CSM displays diagnosis information, which the
customer can forward to the dealer or call centre. In CSM
mode, “CSM”, is displayed in the top right corner of the screen.
The information provided in CSM and the purpose of CSM is to:
• Increase the home repair hit rate.
• Decrease the number of nuisance calls.
• Solved customers' problem without home visit.
5.2.1 Service Alignment Mode (SAM)
How to Enter
To enter SAM, use the following method:
• Press on the remote control the code “062596” directly
followed by the “INFO” key.
After entering SAM, the following screen is visible, the values
can be adjusted according to the requested (see Chapter 8"

Szóval a saját távirányítóján az INFO gomb helyén időzítő óra jele látható. Ha beütöm a 062596 kódot, az első két szám után jön az üzenet, hogy nincs ilyen csatorna, de ha nem hagyom abba, és végig nyomom a 6 számjegyet, majd az INFO gombnak megfelelőt. (Megkerestem a képét a NET-en) akkor sem lép be.
Van valakinek ötlete, vagy más kódja?
Előre is köszönöm!

T.

Sziasztok! Most került hozzám eme készülék, a következő hibával, szalad a kép felfelé, és jobbra egyaránt ( Átlósan ). Kicseréltem az alaplapon levő TDA2579B, és még a digiboxban is, de a helyzet nem javúlt, most még a sorvégtranzisztort is elnyomta. A kérdésem az hogy nem volt itthon B végződésű csak A, ez lehet gond, vagy mind a két helyre egyforma kellene? Vagy máshol keresgéljek? Most pillanatnyilag a digi panelban A, az alaplapon B jelű van berakva.

Sziasztok! Hozzám került a fent nevezett készülék ami semmilyen életjelet nem adott magáról. A táp IC (TEA 1507) 2-8 láb között zárlatos és a 8-as lábon lévő 2.2K ellenállás szakadt. Van-e valakinek tapasztalata ezzel kapcsolatban? Érdemes-e mást is cserélni? És az ellenállás típusa lényeges-e? Ezek nem égnek meg, csak megszakadnak? Köszönöm.