Question about Philips HTS3400/37 System
I have the blinking light issue mentioned a few times here. I have been trying to troubleshoot it. I have found one bad capacitor (C985) And found that no voltage on lead 12 of IC952. I called Philips to try and get a service manual but they will only charge me to replace the system. How frustrating. I can easily get the parts I need if I can figure out where the problem(s) are found. Have any experience with this problem or know where I can get a schematic of the power supply board? ANY help would be greatly appreciated! Thanks!
SOURCE: 470uF capacitors
The 470uF/25V Caps are in the middle of the PCB alongside of the slab-looking aluminum heatsink. You should be able to see that the tops are popped up and the glue around them is brown from overheating.
Posted on Jul 26, 2008
I have the same problem and was told by my local TV repair shop I needed a new LCD panel (at $2000!!!) which I don't believe for a moment since the panels themselves rarely fail. After digging around on the net, I came across a posting from "Arfa Daily" on the sci.tech-archive.com website which points to either the backlight inverter board or the power supply. So far, it is the only intelligent thing I've found that makes any sense. If anyone follows this up and sucessfuly repairs your set, please let me know! ....Acepayday
I will re-post his/her answer here but to read it yourself goto:
"Max" <maxg70@xxxxxxxxxxxx> wrote in message
Hello! I have a Philips 30PF9946D/37 30" LCD that no longer turns on.
Upon pressing the power button, the status LED goes from green to
amber then to red.
Is this a common problem with these?
Could be ps board.
It's a common problem with all LCD TV sets. First, try unplugging the
display panel's backlight inverter board. It is very common for these to
fail and cause the set to revert to standby. Otherwise, it's most likely
that the PSU itself is faulty - also very common.
Examine it *very* carefully for bulged electrolytics on the secondary side.
Note that these may be 'hiding' under bits of heatsink, so look carefully.
Also, check all large and heatsink-mounted devices, for bad (lead-free !!)
joints, which is another common cause of your described symptoms. Other than
this, you're a bit 'on your own' with LCD sets. There are other possible
causes, such as bad sound output chips, but if you really do have a power
supply problem that's not one of the things described, then you will
struggle to get to the bottom of it without schematics, and an intimate
knowledge of switchmode power supplies. These LCD ones are infested with
monitoring circuitry for output voltages and over-current conditions, and
they all work on the standby supply, so if *any* unexpected condition is
detected either at startup, or during use, the standby supply is momentarily
stopped, which causes the system control micro to reset back to its 'sleep'
condition, removing the 'power on' signal to the power supply. Depending on
the set, that may then be an end to it until you try to bring it out of
standby again, or it may just keep trying on its own, causing a flashing
If you can prove which board is causing the trouble, you might want to
consider just replacing that board. PSUs and inverters for many sets, can be
found astonishlingly cheap on the 'net and e-bay sometimes.
Posted on Nov 24, 2008
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Standby/Power light of the TV blinks when there is any internal malfunction in
the TV. The self-diagnostic function of the TV will cause the STANDBY light to
blink or flash when the television detects an issue. The number of times the
STANDBY light flashes corresponds to a specific issue.
examples are given below; some of the issues may be resolved without the need
1 blink / 2 blinks / 5 blinks: - This indicates that there may be a power-related problem with your set.
3 blinks: - This indicates that there may be a power-related problem with your set. The set will need to be serviced to allow a technician to determine the specific issue that needs to be repaired. If the power light flashes three times in sequence in a Lamp TV, the lamp cover is not securely attached. Reattach the lamp cover to resolve this issue.
4 blinks: - This indicates that there may be a back light or lamp power problem.
6 blinks: - This indicates that there is some kind of audio problem with your set.
7 blinks: - This indicates that there is a temperature problem with your set. Please check to make sure that the air vents on the sides and back of the set are not blocked or clogged and there is adequate ventilation around the television. We recommend that you check and clean the vents periodically to make sure the set receives adequate air flow. If the problem continues, the set will need to be serviced.
8 blinks: - This indicates that there may be a video-related problem with your set. If the flash sequence is not listed above or the light continues to flash, follow the steps below to perform a power reset:
Try the following steps to check if the issue can be resolved.
Turn off the television.
Unplug the television power cord from the electrical outlet.
Let the television remain without power for 60 seconds.
Plug the power cord back into the electrical outlet.
the television is plugged into a power strip or surge protector, remove it from
the power strip or surge protector and plug it directly into the wall outlet.
If the issue is resolved, the problem is with the power strip or surge
protector and not the television.
the issue continues to occur, service may be required.
for using Fixya.
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